MERGER AGREEMENT

                                      among

                             GULL LABORATORIES, INC.
                           MERIDIAN DIAGNOSTICS, INC.,
                                  FRESENIUS AG
                                       and
                            MERIDIAN ACQUISITION CO.


                         Dated as of September 15, 1998















                                       TABLE OF CONTENTS

                                                                            Page
                                                                            ----

1.  Definitions............................................................. 1

2.  Basic Transaction....................................................... 4
    2.1    The Merger....................................................... 4
    2.2    The Closing...................................................... 4
    2.3    Actions at the Closing........................................... 4
    2.4    Effect of Merger................................................. 4
    2.5    Procedure for Payment............................................ 5
    2.6    Closing of Transfer Records...................................... 6

3.  Representations and Warranties of Gull and Fresenius.................... 6
    3.1    Organization, Qualification, and Corporate Power................. 6
    3.2    Capitalization................................................... 7
    3.3    Authorization of Transaction..................................... 7
    3.4    Noncontravention................................................. 7
    3.5    Filings with the SEC............................................. 8
    3.6    Events After December 31, 1997................................... 8
    3.7    Undisclosed Liabilities.......................................... 9
    3.8    Brokers' Fees.................................................... 9
    3.9    Insurance........................................................ 9
    3.10   Litigation...................................................... 10
    3.11   Product Warranty................................................ 10
    3.12   Product Liability............................................... 11
    3.13   Employees....................................................... 11
    3.14   Employee Benefits............................................... 11
    3.15   Guaranties...................................................... 13
    3.16   Environment, Health and Safety.................................. 13
    3.17   Intellectual Property........................................... 15
    3.18   Disclosure...................................................... 18
    3.19   Opinion of Financial Advisor.................................... 18
    3.20   Proficiency Surveys............................................. 18
    3.21   Products, Inventories and Operations............................ 18
    3.22   Formulae, Etc., for Products.................................... 20
    3.23   Expiration Dates.  ............................................. 20
    3.24   Subsidiaries and Other Capital Stock............................ 20
    3.25   Real Property................................................... 20
    3.26   Equipment....................................................... 21
    3.27   Contracts and Agreements........................................ 21
    3.28   Accounts Receivable............................................. 21
    3.29   Licenses and Permits............................................ 22
    3.30   Taxes and Tax Returns........................................... 22
    3.31   Transactions With Affiliates.................................... 23






    3.32   Compliance with Applicable Law.................................. 23
    3.33   General Disclosure Matters...................................... 23
    3.34   Other Disclosures............................................... 23

4.  Representations and Warranties of Meridian 
    and the Transitory Subsidiary.......................................... 23
    4.1    Organization.................................................... 24
    4.2    Authorization of Transaction.................................... 24
    4.3    Noncontravention................................................ 24
    4.4    Brokers' Fees................................................... 24
    4.5    Disclosure...................................................... 25
    4.6    Litigation...................................................... 25
    4.7    Available Funds................................................. 25

5.  Representations and Warranties of Fresenius............................ 25
    5.1    Organization.................................................... 25
    5.2    Authorization of Transaction.................................... 25
    5.3    Brokers' Fees................................................... 26
    5.4    Disclosure...................................................... 26
    5.5    Ownership of Stock of Gull Shares............................... 26
    5.6    Transactions with Gull.......................................... 26

6.  Covenants.............................................................. 26
    6.1    General......................................................... 26
    6.2    Notices and Consents............................................ 26
    6.3    Regulatory Matters and Approvals................................ 26
    6.4    Operation of Business........................................... 27
    6.5    Continuance of Operations....................................... 28
    6.6    Due Diligence................................................... 29
    6.7    Notice of Developments.......................................... 30
    6.8    Exclusivity..................................................... 30
    6.9    Bylaw Indemnification........................................... 30
    6.10   Closing Balance Sheet........................................... 31
    6.11   Value of Certain Gull Assets.................................... 31
    6.12   WARN Act Compliance; Severence Obligations...................... 32
    6.13   Service and Other Arrangements.................................. 32
    6.14   Closing Deliveries.............................................. 33
    6.15   Further Meridian Obligations.................................... 33

7.  Covenants of Fresenius; Indemnification................................ 33
    7.1    Voting of Shares................................................ 33
    7.2    Indebtedness of Gull to Fresenius............................... 33
    7.3    Indemnification for Shareholder Actions......................... 34
    7.4    Indemnification by Fresenius.................................... 34
    7.5    Indemnifications by Meridian.................................... 35
    7.6    Zoning Interruptions............................................ 36
    7.7    Indemnification Procedures...................................... 36








    7.8    Transition...................................................... 37
    7.9    Confidentiality................................................. 37
    7.10   Noncompetition and NonSolicitation Covenants.................... 37
    7.11   Contribution to Capital......................................... 38

8.  Conditions to Obligations to Close..................................... 38
    8.1    Conditions to Each Party's Obligation 
           to Effect the Merger............................................ 38
    8.2    Conditions to Obligation of Meridian 
           and the Transitory Subsidiary................................... 39
    8.3    Conditions to Obligation of Gull and Fresenius.................. 41

9.  Termination............................................................ 41
    9.1    Termination of Agreement........................................ 41
    9.2    Effect of Termination........................................... 42

10. Miscellaneous.......................................................... 43
    10.1   Survival........................................................ 43
    10.2   Press Releases and Public Announcements......................... 43
    10.3   No Obligations Upon Fresenius Medical Care AG................... 43
    10.4   No Third Party Beneficiaries.................................... 43
    10.5   Entire Agreement................................................ 44
    10.6   Successors and Assignment....................................... 44
    10.7   Counterparts.................................................... 44
    10.8   Headings........................................................ 44
    10.9   Notices......................................................... 44
    10.10  Governing Law................................................... 45
    10.11  Amendments and Waivers.......................................... 45
    10.12  Severability.................................................... 46
    10.13  Expenses........................................................ 46
    10.14  Construction.................................................... 46
    10.15  Incorporation of Exhibits and Schedules......................... 46
    10.16  Jurisdiction.  ................................................. 46

                                       LIST OF EXHIBITS

Exhibit A - Articles of Merger
Exhibit B - Legal Opinion of Counsel to Gull
Exhibit C - Legal Opinion of Counsel to Fresenius
Exhibit D - Legal Opinion of Counsel to Meridian
Exhibit E - Fairness Opinion

                                     DISCLOSURE SCHEDULES







                                       MERGER AGREEMENT

        THIS MERGER AGREEMENT  ("Agreement") is entered into as of September 15,
1998,  among GULL  LABORATORIES,  INC., a Utah  corporation  ("Gull"),  MERIDIAN
DIAGNOSTICS,  INC.,  an Ohio  corporation  ("Meridian"),  FRESENIUS AG, a German
stock corporation ("Fresenius") and MERIDIAN ACQUISITION CO., a Utah corporation
wholly-owned by Meridian ("Transitory Subsidiary").


                                R E C I T A L S:

        This Agreement contemplates a transaction in which Meridian will acquire
Gull for cash through a reverse  subsidiary merger of the Transitory  Subsidiary
into Gull.

     Now,  therefore,  in consideration of the premises and the mutual covenants
and undertakings contained hereinafter, the Parties agree as follows.

     1. Definitions.

     Unless  the  context  otherwise  requires,  capitalized  terms used in this
Agreement shall have the respective meanings ascribed to them in this Section 1.

     "Affiliate"  has the  meaning  set forth in Rule  12b-2 of the  regulations
promulgated under the Securities Exchange Act.

     "Closing Date" has the meaning set forth in Section 2.2.

     "Code" means the Internal Revenue Code of 1986, as amended.

     "Confidential  Information" means any information concerning the businesses
and affairs of Gull and its  Subsidiaries  that is not already  available to the
public or generally  known in the businesses in which Gull and its  Subsidiaries
are engaged.

     "Controlled  Group of  Corporations"  has the  meaning set forth in Section
1563 of the Code.

     "Disclosure  Schedule" has the meaning set forth in Section 3.  Information
set forth in any section of the  Disclosure  Schedule shall be deemed to qualify
each section of this Agreement  without the necessity of expressed  reference to
such section.

     "Dissenting Share" means any Gull Share held of record by a stockholder who
or which has  exercised  his or its  appraisal  rights  under  the Utah  Revised
Business Corporation Act.

     "Effective Time" has the meaning set forth in Section 2.4.1.








                                      - 2 -

     "Employee Benefit Plan" means any (a) nonqualified deferred compensation or
retirement  plan or arrangement  which is an Employee  Pension Benefit Plan, (b)
qualified  defined  contribution  retirement  plan or  arrangement  which  is an
Employee Pension Benefit Plan, (c) qualified defined benefit  retirement plan or
arrangement   which  is  an  Employee   Pension   Benefit  Plan  (including  any
multiemployer  plan),  or (d) Employee  Welfare  Benefit Plan or material fringe
benefit plan or program.

     "Employee  Pension Benefit Plan" has the meaning set forth in ERISA Section
3(2).

     "Employee  Welfare Benefit Plan" has the meaning set forth in ERISA Section
3(1).

     "ERISA"  means the Employee  Retirement  Income  Security  Act of 1974,  as
amended.

     "Fairness Opinion" has the meaning set forth in Section 3.19.

     "Fresenius" has the meaning set forth in the preface.

     "GAAP" means United States generally accepted  accounting  principles as in
effect from time to time.

     "Gull"  has  the  meaning  set  forth  in  the  preface  and  includes  its
Subsidiaries unless the context requires otherwise.

     "Gull  Share"  means any share of the  Common  Stock,  $0.001 par value per
share, of Gull.

     "Gull  Stockholder"  means any Person who or which is a holder of record of
any Gull Shares.

     "Hart-Scott-Rodino Act" means the Hart-Scott-Rodino  Antitrust Improvements
Act of 1976, as amended.

     "Intellectual Property Assets" has the meaning set forth in Section 3.17.

     "Knowledge"  or "to the Knowledge of" means in the case of Gull, the actual
knowledge after reasonable investigation of Dr. Silke Humberg, Michael B. Malan,
Dr. Fred Rachford,  Holly Scribner,  Frank J. Simon, Andrew Taylor, John Turner,
Dr.  Martina  Vogel or Dr.  Linxian  Wu, and in the case of  Fresenius,  has the
meaning set forth in Section 5.

     "Meridian" has the meaning set forth in the preface.

     "Meridian  Note" The promissory  note of Meridian to be issued to Fresenius
at the Closing pursuant to Section 7.2.

     "Merger" has the meaning set forth in Section 2.1.






                                      - 3 -

     "1997 10-K" has the meaning set forth in Section 3.5.

     "1998 10-Q" has the meaning set forth in Section 3.5.

     "Ordinary  Course of  Business"  means  the  ordinary  course  of  business
consistent with past custom and practice (including with respect to quantity and
frequency).

     "Paying Agent" has the meaning set forth in Section 2.5.

     "Person" means an  individual,  a  partnership,  a  corporation,  a limited
liability  company,  an  association,  a joint stock  company,  a trust, a joint
venture,  an  unincorporated  organization  or a  governmental  entity  (or  any
department, agency or political subdivision thereof).

     "Products" means all of the products manufactured,  produced or distributed
by Gull  and its  Subsidiaries,  including,  without  limitation,  the  products
identified in the Disclosure Schedule.

     "Proxy  Materials"  means  the  proxy  materials  relating  to the  special
meeting.

     "Public Reports" has the meaning set forth in Section 3.5.

     "SEC" means the Securities and Exchange Commission.

     "SEC Filings" has the meaning set forth in Section 6.3.1.

     "Securities  Exchange  Act" means the  Securities  Exchange Act of 1934, as
amended.

     "Security Interest" means any mortgage,  pledge, lien, encumbrance,  charge
or other security  interest,  excepting only (a) mechanic's,  materialman's  and
similar liens, (b) liens for taxes not yet due and payable or for taxes that the
taxpayer  is  contesting  in good faith  through  appropriate  proceedings,  (c)
purchase money liens securing rental payments under capital lease  arrangements,
and (d) other liens arising in the Ordinary  Course of Business and not incurred
in connection with the borrowing of money.

     "Subsidiary" means any corporation with respect to which a specified Person
(or a Subsidiary  thereof)  owns a majority of the common stock or has the power
to vote or direct the voting of  securities  entitled to vote  generally  in the
election of directors  sufficient to elect a majority of the  directors.  In the
case of Gull, Subsidiaries includes non-corporate entities, all or a majority of
the equity interest of which are owned by Gull or a Subsidiary of Gull, with the
Subsidiaries  being Gull  Laboratories  International,  Inc., Gull  Laboratories
GmbH,  Gull  Europe  S.A.,   Biodesign,   Inc.,  Gull  Laboratories  S.A.,  Gull
Laboratories N.V.

     "Third Party Offer" has the meaning set forth in Section 6.8.







                                      - 4 -

     "Transitory Subsidiary" has the meaning set forth in the preface.

     2. Basic Transaction.

        2.1  The  Merger. Subject to the terms and conditions of this Agreement,
the  Transitory  Subsidiary  shall  merge into Gull at the  Effective  Time (the
"Merger"). Gull shall be the corporation surviving the Merger.

        2.2 The  Closing.  The  closing  of the  Merger  shall take place at the
offices  of  Keating,  Muething  &  Klekamp,  P.L.L.,  One East  Fourth  Street,
Cincinnati,  Ohio 45202,  commencing  at 10:00 a.m.  Eastern  time on the second
business day following the satisfaction or waiver of all conditions set forth in
Section 8 (other than conditions with respect to actions the respective  Parties
will take at the closing itself) or such other date and place as the Parties may
mutually determine in writing (the "Closing Date").

        2.3  Actions  at the  Closing.  At the  closing,  Gull will  deliver  to
Meridian  and  the  Transitory  Subsidiary  the  certificates,  instruments  and
documents  referred to in Section 8.2.  Meridian and the  Transitory  Subsidiary
will deliver to Gull the certificates,  instruments and documents referred to in
Section 8.3. On the Closing Date,  Gull and the Transitory  Subsidiary will file
with the Utah Division of Corporations and Commercial Code Articles of Merger in
the form  attached  hereto as Exhibit A, and  Meridian  will  deliver the Merger
consideration to the Paying Agent in the manner provided in this Section 2.

        2.4    Effect of Merger.

               2.4.1 General. The Merger shall become effective at the time Gull
        and the Transitory  Subsidiary file the properly  executed and certified
        Articles of Merger with the Utah Division of Corporations and Commercial
        Code,  or at such later time as the  parties  shall agree and specify in
        the Articles of Merger (the "Effective Time"). The Merger shall have the
        effects set forth in the Utah Revised Business Corporation Act. From and
        after the Effective  Time,  Gull, as the  surviving  corporation  in the
        Merger,  shall  possess  all  of  the  rights,  privileges,  powers  and
        franchises  of a public as well as a private  nature,  and be subject to
        all of the restrictions, disabilities and duties of each of Gull and the
        Transitory  Subsidiary,  as the constituent  corporations in the Merger,
        all as set forth in Section  16-10a-1101,  et seq.,  of the Utah Revised
        Business Corporation Act.

               2.4.2 Gull Corporate Documents. The Articles of Incorporation and
        Bylaws of Gull shall be amended  at the  Effective  Time as set forth in
        the Articles of Merger to be identical to the Articles of  Incorporation
        and  Bylaws  of  the  Transitory  Subsidiary  immediately  prior  to the
        Effective Time, except as provided in Section 6.9.

               2.4.3  Directors and Officers.  The directors and officers of the
        Transitory Subsidiary shall become the directors and officers of Gull at
        the Effective Time.






                                      - 5 -

               2.4.4 Conversion of Gull Shares. At the Effective Time, by virtue
        of the  Merger  and  without  any  further  action  by  Gull,  Meridian,
        Fresenius or the Transitory Subsidiary,  each Gull Share then issued and
        outstanding,  other than any Dissenting  Share,  shall be converted into
        the right to receive Two Dollars and  Twenty-Five  Cents ($2.25) in cash
        without interest,  and each Dissenting Share shall be converted into the
        right to receive  payment from Gull with  respect  thereto to the extent
        provided by, and in accordance  with, the provisions of the Utah Revised
        Business   Corporation   Act,   provided,   however,   that  the  Merger
        consideration per Gull Share shall be subject to equitable adjustment in
        the event of any stock split,  stock  dividend,  reverse stock split, or
        other  change in the  number of Gull  Shares  outstanding  other than an
        increase in the number of  outstanding  Gull Shares  resulting  from the
        exercise of options to  purchase  Gull  Shares  outstanding  on the date
        hereof.  After the  Effective  Time, no Gull Share shall be deemed to be
        outstanding,  other than Gull Shares issued pursuant to Section 2.4.5,or
        to have any rights other than those set forth in this Section.

               2.4.5  Conversion of Capital Stock of the Transitory  Subsidiary.
        At and as of the  Effective  Time,  each  share of  Common  Stock of the
        Transitory Subsidiary shall be converted into one share of Common Stock,
        $0.001 par value per share, of Gull.

        2.5    Procedure for Payment.

               2.5.1 Immediately after the Effective Time, Meridian will deposit
        with a commercial bank (the "Paying Agent") a payment fund consisting of
        cash  sufficient for the Paying Agent to make full payment of the Merger
        consideration  to  the  holders  of  record  immediately  prior  to  the
        Effective  Time of all of the  outstanding  Gull Shares  (other than any
        Dissenting  Shares).  Meridian  will  cause the  Paying  Agent to mail a
        letter of transmittal in customary form which shall contain instructions
        for use in effecting the surrender of such  certificates  evidencing the
        outstanding Gull Shares in exchange for the Merger  consideration.  Upon
        surrender  of a  certificate  to the  Paying  Agent for  cancella  tion,
        together  with a duly  executed  letter of  transmittal  and such  other
        documents as may be reasonably requested by the Paying Agent, the holder
        of such  certificate  shall be entitled to receive in exchange  therefor
        the amount of cash, without interest, into which Gull Shares theretofore
        represented  by  such  certificate  shall  have  been  converted  at the
        Effective Time; and the certificate so surrendered shall be canceled. In
        the  event  of a  transfer  of  ownership  of  Gull  Shares  that is not
        registered  in the  transfer  records of Gull,  payment may be made to a
        Person  other  than  the  Person  in  whose  name  the   certificate  so
        surrendered is registered if such certificate shall be properly endorsed
        or otherwise  be in proper form for  transfer and the Person  requesting
        such payment shall pay any transfer or other taxes required by reason of
        the  payment  to a Person  other  than  the  registered  holder  of such
        certificate or establish to the  satisfaction  of Gull, as the surviving
        corporation,  that such tax has been paid or is not applicable. Until so
        surrendered,  each  certificate  shall be deemed  at any time  after the
        Effective  Time to  represent  only the right to  receive  the amount of
        cash, without interest,  into which Gull Shares theretofore  represented







                                      - 6 -

        by  such  certificate  shall  have been  converted at the Effective Time
        pursuant to this Section.

        If a certificate  shall have been lost,  stolen or  destroyed,  upon the
        making  of an  affidavit  of  that  fact  by the  Person  claiming  such
        certificate to be lost, stolen or destroyed and, if required by Meridian
        or Gull,  upon the  posting by such  Person of a bond in such  amount as
        Meridian or Gull may  reasonably  direct as indemnity  against any claim
        that may be made  against it with respect to such  certificate  and upon
        such Person's  compliance with the other  requirements set forth herein,
        the Paying Agent will issue in respect of such lost, stolen or destroyed
        certificate,  the Merger  consideration  to be received by virtue of the
        Merger with respect to Gull Shares represented thereby.

               2.5.2  Meridian  may cause the Paying Agent to invest the payment
        fund  in  securities  of a  United  States  commercial  bank  or of  the
        government of the United States or any state thereof, provided, that the
        terms and conditions of the  investments  shall be such as to permit the
        Paying  Agent to make  prompt  payment  of the Merger  consideration  as
        necessary.  Meridian  may cause the Paying Agent to pay over to Gull any
        net earnings with respect to the investments,  and Meridian will deposit
        promptly  with the Paying Agent any portion of the payment fund which is
        lost through investments.

               2.5.3 Meridian may cause the Paying Agent to pay over to Gull any
        portion of the payment fund including any earnings thereon remaining 180
        days  after  the  Effective   Time,   and  thereafter  all  former  Gull
        Stockholders  shall be  entitled to look to Gull,  subject to  abandoned
        property,  escheat, and other similar laws, as general creditors thereof
        with respect to the Merger consideration payable upon surrender of their
        certificates.

               2.5.4  Meridian  shall pay all charges and expenses of the Paying
Agent.

        2.6  Closing of  Transfer  Records.  After the close of  business on the
Closing Date,  transfers of Gull Shares  outstanding prior to the Effective Time
shall not be made on the stock transfer books of Gull.

        3. Representations and Warranties of Gull and Fresenius. Gull represents
and  warrants to Meridian  and the  Transitory  Subsidiary  that the  statements
contained in this Section 3 and the accompanying Disclosure Schedule are correct
and complete as of the date of this Agreement.

        3.1 Organization,  Qualification,  and Corporate Power. Each of Gull and
its Subsidiaries is a corporation  duly organized,  validly existing and in good
standing  under  the  laws  of  the   jurisdiction  of  its   incorporation   or
organization.  Each of Gull and its  Subsidiaries  is duly authorized to conduct
business and is in good standing under the laws of each jurisdiction  where such
qualification is required except where the lack of such qualification  would not
have a  material  adverse  effect  on the  financial  condition  of Gull and its
Subsidiaries taken as a whole or on the ability of the parties to consummate the
transactions contemplated by this Agreement.






                                      - 7 -

     Each of Gull and its Subsidiaries has full corporate power and authority to
carry on the businesses in which it is engaged and to own and use the properties
owned and used by it. The minute  books  containing  records of meetings of Gull
Stockholders,  directors and  committees of  directors,  Gull stock  certificate
books and stock records are each correct and  complete.  Neither any of Gull nor
any of its  Subsidiaries is in default under or in violation of any provision of
its charter or Bylaws.

        3.2 Capitalization. The entire authorized capital stock of Gull consists
of 50,000,000 Gull Shares,  $0.001 par value per share,  and 5,000,000 shares of
Preferred  Stock,  $0.01 par value per share.  As of the date hereof,  8,016,012
Gull Shares are issued and  outstanding and no Gull Shares are held in treasury.
No shares  of Gull  Preferred  Stock  are  outstanding.  All of the  issued  and
outstanding Gull Shares have been duly authorized and are validly issued,  fully
paid and non-assessable.  Except as set forth in the Disclosure Schedule,  there
are  no  outstanding  or  authorized   options,   warrants,   purchase   rights,
subscription rights,  conversion rights,  exchange rights, or other contracts or
commitments that could require Gull or any of its  Subsidiaries to issue,  sell,
or otherwise cause to become  outstanding any of its capital stock. There are no
outstanding   or  authorized   stock   appreciation,   phantom   stock,   profit
participation,   or  similar   rights  with  respect  to  Gull  or  any  of  its
Subsidiaries.  Except as set forth in the  Disclosure  Schedule,  all issued and
outstanding  shares of capital  stock of each  Subsidiary of Gull have been duly
authorized and are validly issued and fully paid and  non-assessable  and all of
such  shares  are owned of record  and  beneficially  by Gull,  free,  clear and
unencumbered,  and Gull or a wholly-owned  Subsidiary has sole voting power with
respect to all of such shares.

        3.3  Authorization of Transaction.  The Board of Directors of Gull, at a
meeting  duly  called and held,  has duly  adopted  resolutions  approving  this
Agreement and the Merger,  determining that the terms of the Merger are fair to,
and in the best interests of, Gull's  Stockholders and recommending  that Gull's
Stockholders  approve and adopt this  Agreement  and the  Merger.  Gull has full
power and  authority  to execute and deliver this  Agreement  and to perform its
obligations  hereunder,  subject to approval and adoption of this  Agreement and
the  Merger  by the  requisite  majority-in-interest  of  Gull  Stockholders  as
provided by the Utah Revised Business  Corporation Act. The execution,  delivery
and performance of this Agreement and the consummation by Gull of the Merger and
of the other transactions  contemplated  hereby have been duly authorized by the
Board of Directors  of Gull and no other  corporate  proceedings  on the part of
Gull are necessary to authorize this Agreement or to consummate the transactions
so contemplated other than the requisite  stockholder  approval.  This Agreement
has been duly  executed  and  delivered  by Gull and,  assuming  this  Agreement
constitutes  a valid and  binding  obligation  of  Meridian  and the  Transitory
Subsidiary,  constitutes  a valid and  binding  obligation  of Gull  enforceable
against Gull in accordance  with its terms,  subject to  applicable  bankruptcy,
insolvency,  moratorium  or other  similar laws  relating to  creditors'  rights
generally and to general principles of equity.

        3.4  Noncontravention.  Except as set forth in the  Disclosure  Schedule
and, except for filings, permits, authorizations,  consents and approvals as may







                                      - 8 -

be required under  applicable  requirements of the Securities  Exchange Act, the
Hart-Scott-Rodino  Act, the laws of Utah, the laws of other states in which Gull
and its  Subsidiaries  are  qualified  to do or are  doing  business  and  state
takeover laws, and except for requisite Gull Stockholder approval and the filing
of Articles of Merger with the Utah  Division  of  Corporations  and  Commercial
Code,  neither  the  execution  and  the  delivery  of  this  Agreement  nor the
consummation  of  the  transactions   contemplated   hereby,  will  violate  any
constitution,  statute, regulation,  rule, injunction,  judgment, order, decree,
ruling, charge, or other restriction of any government,  governmental agency, or
court to which any of Gull and its  Subsidiaries  is subject or any provision of
the  charter or Bylaws of any of Gull and its  Subsidiaries  or  conflict  with,
result in a breach of,  constitute a default under,  result in the  acceleration
of, create in any party the right to accelerate,  terminate,  modify, or cancel,
or require any notice under any agreement, contract, lease, license, instrument,
or other  arrangement to which any of Gull and its Subsidiaries is a party or by
which it is bound or to which  any of its  assets  is  subject  or result in the
imposition  of any Security  Interest  upon any of its assets,  except where the
violation, conflict, breach, default, acceleration,  termination,  modification,
cancellation,  failure to give  notice,  or Security  Interest  would not have a
material adverse effect on the financial  condition of Gull and its Subsidiaries
taken as a whole or on the ability of the Parties to consummate the transactions
contemplated by this Agreement.

        3.5 Filings with the SEC. Gull has made all filings with the SEC that it
has been required to make under the Securities Exchange Act, including,  without
limitation,  Gull's Annual  Report on Form 10-K for the year ended  December 31,
1997 (the "1997 10-K") and Gull's  Quarterly Report on Form 10-Q for the quarter
ended  June 30,  1998 (the  "1998  10-Q")  (the  1997  10-K and 1998 10-Q  being
referred to  collectively as the "Public  Reports").  At the time filed with the
SEC,  each of the Public  Reports  complied in all  material  respects  with the
Securities  Exchange Act and the  applicable  rules and  regulations  of the SEC
thereunder.  At the time filed with the SEC,  the  Public  Reports,  as of their
respective  filing dates, did not include an untrue statement of a material fact
or omit to state a  material  fact  necessary  in  order to make the  statements
therein,  in the light of the  circumstances  under  which they were  made,  not
misleading.  Gull has  delivered to Meridian a correct and complete copy of each
Public Report.

        3.6    Events After December 31, 1997.

        3.6.1  Except as disclosed  in the Public  Reports or in the  Disclosure
Schedule, since December 31, 1997 there has not been any material adverse change
in the  business,  financial  condition,  cash  flows,  operations,  results  of
operations or prospects of Gull and its Subsidiaries, taken as a whole.

        3.6.2 Except as set forth in the Disclosure Schedule, since December 31,
1997, neither Gull nor any of its Subsidiaries:

               3.6.2.1 has transferred or encumbered  assets or entered into any
        agreement outside the Ordinary Course of Business or granted any license
        or  sublicense of any rights with respect to any  Intellectual  Property
        Assets; or






                                      - 9 -

               3.6.2.2 granted any Security Interest or made any loan or entered
        into any other  transaction  with any  directors,  officers or employees
        outside the Ordinary Course of Business; or

               3.6.2.3 entered into any employment agreement, modified the terms
        of any existing employment agreement; or

              3.6.2.4 granted any increase in base compensation to any director,
        officer or employee; or

               3.6.2.5   adopted, amended or modified any Employee Benefit Plan;
        or

               3.6.2.6 made any capital  expenditures  or committed to make such
        expenditures in excess of $10,000; or

               3.6.2.7 reduced or limited the insurance coverages  maintained on
        its behalf or the manner in which it uses,  operates  or  maintains  its
        property; or

               3.6.2.8 made any investments or contributions to any other Person
        other than in the  Ordinary  Course of  Business,  in excess of $10,000,
        individually or in the aggregate.

        3.7  Undisclosed  Liabilities.  Except  as set  forth in the  Disclosure
Schedule, none of Gull and its Subsidiaries has any material liability,  whether
asserted or  unasserted,  whether  absolute or  contingent,  whether  accrued or
unaccrued,  whether liquidated or unliquidated and whether due or to become due,
including any material liability for taxes,  except for liabilities set forth in
the  Public  Reports  or for  which  reasonable  reserves  are  maintained,  and
liabilities  which have  arisen  after June 30, 1998 in the  Ordinary  Course of
Business.

        3.8 Brokers' Fees. Except as set forth in the Disclosure Schedule,  none
of Gull and its  Subsidiaries has any liability or obligation to pay any fees or
commissions  to any  broker,  finder or agent with  respect to the  transactions
contemplated by this Agreement.

        3.9  Insurance.   The  Disclosure  Schedule  sets  forth  the  following
information with respect to each insurance policy,  including without limitation
policies  providing  medical,  directors'  and  officers',  property,  casualty,
liability and workers'  compensation  coverage and bond and surety arrangements,
to  which  any of Gull  and its  Subsidiaries  is a party,  a named  insured  or
otherwise the beneficiary of coverage:

               3.9.1      the name, address and telephone number of the agent;

               3.9.2      the  name of the insurer, the name of the policyholder
        and the name of each covered insured;






                                     - 10 -

               3.9.3      the policy number and the period of coverage;

               3.9.4 the scope,  including an indication of whether the coverage
        was on a claims made, occurrence or other basis, and amount, including a
        description of how  deductibles and ceilings are calculated and operate,
        of coverage; and

               3.9.5 a description  of any  retroactive  premium  adjustments or
        other loss-sharing arrangements.

With respect to each such insurance policy, to Gull's Knowledge:  (A) the policy
is legal,  valid,  binding,  enforceable  and in full force and effect;  (B) the
policy will continue to be legal, valid, binding,  enforceable and in full force
and effect on identical  terms  following the  consummation of the Merger except
that,  subject to Section 6.9,  coverage of Gull under  policies  maintained  by
Fresenius  will  terminate  at the  Effective  Time;  (C)  none of Gull  and its
Subsidiaries  nor any other party to the policy is in material breach or default
(including with respect to the payment of premiums or the giving of notices) and
no event has occurred which,  with notice or the lapse of time, would constitute
such a breach or default, or permit  termination,  modification or acceleration,
under the policy;  and (D) no party to the policy has  repudiated  any provision
thereof.  Each of Gull and its  Subsidiaries  has been covered  since January 1,
1995  by  insurance  in  scope  and  amount  customary  and  reasonable  for the
businesses  in  which it has  engaged  during  the  aforementioned  period.  The
Disclosure Schedule describes any self-insurance  arrangements  affecting any of
Gull and its Subsidiaries.

        3.10  Litigation.  The  Disclosure  Schedule sets forth each instance in
which any of Gull and its Subsidiaries is subject to any outstanding injunction,
judgment,  order, decree, ruling or charge or is a party or, to Gull's Knowledge
is  threatened  in writing to be made a party to any action,  suit,  proceeding,
hearing  or  investigation  of,  in, or before  any court or  quasi-judicial  or
administrative  agency of any federal,  state, local or foreign  jurisdiction or
before any arbitrator,  an adverse  determination  of which could  reasonably be
expected to result in any material  adverse  change in the  business,  financial
condition,  cash flows,  operations,  results of operations or prospects of Gull
and its Subsidiaries, taken as a whole.

        3.11 Product Warranty.  Except as set forth in the Disclosure  Schedule,
to Gull's Knowledge,  each product  manufactured,  distributed,  sold, leased or
delivered  by Gull or any of its  Subsidiaries  has  been in  conformity  in all
material respects with all applicable contractual  commitments and all expressed
and implied warranties.  Except as set forth in the Disclosure Schedule, none of
Gull and its  Subsidiaries  has any liabilities in excess of the liabilities set
forth in the Public Reports or for which reasonable  reserves are maintained for
any guaranty,  warranty or other indemnity  arising from products  manufactured,
sold,  leased  or  delivered  by any of Gull and its  Subsidiaries,  except  for
liabilities which are not reasonably  expected to result in any material adverse
change in the business, financial condition, cash flows, operations,  results of
operations  or prospects  of Gull and its  Subsidiaries,  taken as a whole,  and
liabilities  which have  arisen  after June 30, 1998 in the  Ordinary  Course of
Business.






                                     - 11 -

        3.12  Product  Liability.  Except as  reserved  for in the  consolidated
financial  statements  contained  in  the  1997  10-K  or as  set  forth  in the
Disclosure Schedule, to Gull's Knowledge,  none of Gull and its Subsidiaries has
any liability arising out of any injury to any Person or property as a result of
the ownership, possession or use of any Product manufactured, distributed, sold,
leased or  delivered  by any of Gull and its  Subsidiaries  except  for any such
liabilities which are not reasonably  expected to result in any material adverse
change in the business, financial condition, cash flows, operations,  results of
operations or prospects of Gull and its Subsidiaries, taken as a whole.

        3.13  Employees.  Except as set  forth in the  Disclosure  Schedule,  to
Gull's Knowledge, no executive, key employee or group of employees has any plans
to terminate employment with any of Gull and its Subsidiaries other than routine
terminations which are not reasonably expected to result in any material adverse
change in the business, financial condition, cash flows, operations,  results of
operations or prospects of Gull and its Subsidiaries,  taken as a whole.  Except
as set  forth  in the  Public  Reports,  none  of the  employees  of Gull or its
Subsidiaries are subject to any collective bargaining  agreement.  Since January
1,  1998,  none of Gull or its  Subsidiaries  have  committed  an  unfair  labor
practice as such term is defined in federal  labor law or similar  action  under
non-United  States labor laws,  or  experienced  any strikes,  charges of unfair
labor practices or other  collective  bargaining  disputes,  except for any such
practices,  strikes,  claims or disputes  which are not  reasonably  expected to
result in any material adverse change in the business, financial condition, cash
flows,  operations,   results  of  operations  or  prospects  of  Gull  and  its
Subsidiaries,  taken as a whole.  Gull has no  Knowledge  of any  organizational
effort  presently  being made or  threatened  by or on behalf of any labor union
with respect to employees of any of Gull and its Subsidiaries.

        3.14   Employee Benefits.

               3.14.1 The Disclosure  Schedule lists each Employee  Benefit Plan
        that any of Gull and its Subsidiaries  maintains or to which any of Gull
        and its Subsidiaries contributes.

                      3.14.1.1 Each such Employee Benefit Plan (and each related
               trust, insurance contract or fund) subject to ERISA substantially
               complies in form and in operation in all material  respects  with
               the  applicable   requirements  of  ERISA,  the  Code  and  other
               applicable   laws  of   United   States  or   non-United   States
               jurisdictions.

                      3.14.1.2 All required reports and descriptions,  including
               Form 5500 Annual  Reports,  Summary Annual  Reports,  PBGC-1s and
               Summary  Plan  Descriptions,   have  been  filed  or  distributed
               appropriately  with respect to each Employee Benefit Plan subject
               to Title I of ERISA.  The requirements of Part 6 of Subtitle B of
               Title 1 of ERISA and of Code Section 4980B have  materially  been
               met with respect to each such  Employee  Benefit Plan which is an
               Employee Welfare Benefit Plan.






                                     - 12 -


                      3.14.1.3  All   contributions,   including   all  employer
               contributions and employee salary reduction contributions,  which
               are due  prior to the date of this  Agreement  have  been paid to
               each such  Employee  Benefit  Plan which is an  Employee  Pension
               Benefit Plan and all  contributions  which are due for any period
               ending on or before  the  Closing  Date will have been paid on or
               before the Closing  Date to each such  Employee  Pension  Benefit
               Plan or will have been accrued in accordance with the past custom
               and practice of Gull and its Subsidiaries.  All premiums or other
               payments  which are due for all  periods  ending on or before the
               Closing  Date will have been paid on or before the  Closing  Date
               with  respect  to each such  Employee  Benefit  Plan  which is an
               Employee Welfare Benefit Plan.

                      3.14.1.4  Each  such  Employee  Benefit  Plan  which is an
               Employee  Pension  Benefit Plan covering  employees in the United
               States  which is  intended  to be a  "qualified  plan" under Code
               Section  401(a)  substantially  meets  the  requirements  of Code
               Section 401(a) and has received a favorable  determination letter
               form the Internal  Revenue  Service or has pending an application
               for a determination letter which was timely filed.

                      3.14.1.5  The  market  value of  assets  under  each  such
               Employee  Benefit Plan which is an Employee  Pension Benefit Plan
               covering   employees  in  the  United  States,   other  than  any
               multiemployer  plan,  equals or  exceeds  (or does not fail by an
               amount  which is material to Gull to equal or exceed) the present
               value  of  all  vested  and  nonvested   liabilities   thereunder
               determined   in  accordance   with  PBGC  methods,   factors  and
               assumptions  applicable  to  an  Employee  Pension  Benefit  Plan
               terminating on the date for determination.

                      3.14.1.6  Gull  has  delivered  to  Meridian  correct  and
               complete   copies  of  the  plan   documents   and  summary  plan
               description,  the most recent  determination letter received from
               the Internal  Revenue Service (for each Employee  Pension Benefit
               Plan),  the most recent Form 5500 Annual  Report,  if applicable,
               and all related trust agreements,  insurance  contracts and other
               funding  agreements  or  other  documents  which  implement  each
               Employee Benefit Plan.

               3.14.2 With  respect to each  Employee  Benefit  Plan that any of
        Gull, its Subsidiaries  and the Controlled  Group of Corporations  which
        includes  Gull and its  Subsidiaries  maintains or ever has  maintained,
        within the seven years  ending on the Closing  Date,  or to which any of
        them  contributes,  contributed  within  the seven  years  ending on the
        Closing Date, or ever has been required to contribute,  within the seven
        years ending on the Closing Date:

                      3.14.2.1   No  such  Employee  Benefit Plan is an Employee
               Pension Benefit Plan that is subject to Title IV of ERISA.






                                     - 13 -


                      3.14.2.2   To  Gull's   Knowledge,   there  have  been  no
               prohibited transactions (as defined in ERISA Section 406 and Code
               Section  4975) with  respect to any such  Employee  Benefit  Plan
               subject to Title I of ERISA.  No  Fiduciary  (as defined in ERISA
               Section  3(21)) has any liability for breach of fiduciary duty or
               any  other  failure  to act or  comply  in  connection  with  the
               administration  or  investment of the assets of any such Employee
               Benefit   Plan.   No  action,   suit,   proceeding,   hearing  or
               investigation   with  respect  to  the   administration   or  the
               investment of the assets of any such Employee Benefit Plan (other
               than  routine  claims  for  benefits)  is  pending  or, to Gull's
               Knowledge, threatened. Gull has no Knowledge of any basis for any
               such action, suit, proceeding, hearing or investigation.

               3.14.3 None of Gull,  its  Subsidiaries  and the other members of
        the  Controlled  Group  of  Corporations  that  includes  Gull  and  its
        Subsidiaries  contributes  to, has, within the seven years ending on the
        Closing  Date,  contributed  to, or been  required to  contribute to any
        multiemployer plan or has any liability, including withdrawal liability,
        under any multiemployer plan as defined in Section 4001(a)(3) of ERISA.

               3.14.4  None  of  Gull  and its  Subsidiaries  contributes  or is
        required to contribute to any Employee  Welfare  Benefit Plan  providing
        medical,  health or life  insurance or other  welfare-type  benefits for
        current or future  retired or  terminated  employees,  their  spouses or
        their dependents, other than in accordance with Code Section 4980B.

        3.15 Guaranties.  Except as set forth in the Disclosure  Schedule or the
Public Reports, none of Gull and its Subsidiaries is a guarantor or otherwise is
liable for any material liability or obligation,  including indebtedness, of any
other Person.

        3.16   Environment, Health and Safety.

               3.16.1  Except as set forth in the  Disclosure  Schedule,  to the
        Knowledge of Gull, all real property owned, leased or controlled by Gull
        and the  improvements  thereon and the soil and  groundwater  thereunder
        ("Properties"):  (i) do not  contain  and  are not  contaminated  by any
        Hazardous  Substance;  (ii)  do not  contain  and  have  not  previously
        contained  underground storage tanks; (iii) have never been used for the
        generation,  treatment,  storage or disposal of any Hazardous  Substance
        (other than routine storage,  use and sale of Hazardous  Substances from
        time to time in the Ordinary  Course of Business and in  compliance,  in
        all material respects,  with Environmental,  Health and Safety Laws), or
        for mining,  landfilling,  dumping,  gasoline  station,  dry cleaning or
        commercial petroleum product storage purposes;  (iv) have never been the
        subject of any activities  representing a violation or alleged violation
        of,  and  are  not  currently  under  investigation   pursuant  to,  any
        Environmental, Health or Safety Laws or any obligation to report  to  or






                                            - 14 -

        action  by  a  governmental  authority  pursuant  to any  Environmental,
        Health  or  Safety  Laws,  and   are   in  full   compliance   with  all
        Environmental, Health or Safety Laws; (v)  have  not been subject to any
        release of any Hazardous Substance from any nearby  property;  (vi) have
        never been the subject  of  an  environmental  audit or  assessment,  or
        remedial action or a lien  or  encumbrance for an environmental problem;
        and (vii) do not contain  asbestos, polychlorinated  biphenyls (PCBs) or
        nuclear fuels or wastes.

               3.16.2  Gull:  (i)  is,  and  has  been,  to  its  Knowledge,  in
        compliance in all material  respects with all applicable  Environmental,
        Health or Safety Laws; (ii) has not received any notices, demand letters
        or requests for information  from any  governmental  entity or any third
        party that  assert Gull may be in  violation  of, or liable  under,  any
        Environmental,  Health  or  Safety  Laws;  (iii) is not  subject  to any
        notice,  order or decree of any court,  or  governmental  entity arising
        under any Environmental,  Health or Safety Laws, except for such matters
        as do not,  individually  or in the aggregate,  have a material  adverse
        effect  on  Gull,  its  business,  or  its  Properties;   (iv)  has  not
        transported  or  arranged  for  the   transportation  of  any  Hazardous
        Substances  to any site  listed  on EPA's  National  Priorities  List of
        Hazardous  Substance Sites or comparable state Hazardous  Substance Site
        List; and (v) is not liable for any Hazardous Substance contamination at
        any other site or location  under any  Environmental,  Health and Safety
        Laws.  To its  Knowledge,  Gull has timely and  accurately  filed  every
        report  or  notification   required  to  be  filed,  and  has  acquired,
        maintained and timely submitted  renewal  applications for all necessary
        certificates  and  permits  and  has  and  is in  compliance  with  such
        certificates  and  permits  (all of which are  listed in the  Disclosure
        Schedule),  and has generated and maintained all data, documentation and
        records required under all Environmental,  Health or Safety Laws. Copies
        of all  documents  received by Gull from,  or  submitted by Gull to, any
        governmental  authority,  court,  or third party  concerning any matters
        arising  under  any  Environmental,  Health  and  Safety  Laws,  and all
        reviews, audits, assessments,  analyses or other documents pertaining to
        Environmental,  Health and Safety Laws,  have been  furnished by Gull to
        Meridian.

               3.16.3 Except as set forth in the Disclosure Schedule,  there are
        not now  pending  or, to Gull's  Knowledge,  threatened,  and during the
        preceding five (5) years, there has not occurred any Occupational Safety
        and  Health  Act  ("OSHA")  inspections,  complaints,  and/or  citations
        relating to Gull's  business  operations or the places where it conducts
        its  business  operations.  To Gull's  Knowledge,  no  modifications  or
        changes  in or to any of the  Properties  or the  manner  in which  Gull
        conducts its business are necessary to continue operations in accordance
        with applicable OSHA requirements.

               3.16.4  Definitions.

                      3.16.4.1 "Environmental, Health and Safety Laws" means all
               foreign,   federal,  state  and  local  laws,  statutes,   codes,
               ordinances,   regulations,   rules,  policies,  consent  decrees,
               judicial  or  administrative orders, permits, approvals, or other






                                     - 15 -

               requirements  relating to the protection of  human  health or the
               environment,  all  as  amended  or  modified  from  time to time,
               including without  limitation,  the  Comprehensive  Environmental
               Response, Compensation, and Liability Act of 1980, as amended (42
               U.S.C.  Section 9601, et seq.),  the Solid Waste Disposal Act, as
               amended (42 U.S.C.  Section 6901, et seq.),  the Hazardous  Waste
               Materials Transportation Act, as amended (49 U.S.C. Section 1801,
               et seq.), the Clean Air Act, as amended (42 U.S.C.  Section 7401,
               et seq.), the Federal Water Pollution Control Act, as amended (33
               U.S.C.  Section 1251, et seq.), the Toxic Substances Control Act,
               as amended (15 U.S.C.  Section 2601, et seq.),  the Safe Drinking
               Water Act,  as amended (42 U.S.C.  Section  300f,  et seq.),  the
               Atomic Energy Act, as amended (42 U.S.C.  Section 2014, et seq.),
               the Federal Insecticide Fungicide and Rodenticide Act, as amended
               (7 U.S.C.  Section 136, et seq.),  the Oil Pollution Act of 1990,
               as amended  (33 U.S.C.  Section  2701,  et seq.),  the  Emergency
               Planning and Community  Right-to-Know Act of 1986, as amended (42
               U.S.C.  Section  11001,  et seq.),  the  Occupational  Safety and
               Health Act, as amended (29 U.S.C.  Section 651, et seq.), and the
               regulations   adopted  and  publications   promulgated   pursuant
               thereto,  and shall also  include any common law theory  based on
               nuisance, trespass, negligence or other tortious conduct.

                      3.16.4.2   "Hazardous   Substance"  means  any  substance,
               material   or  waste   (a)  the   presence   of  which   requires
               investigation or remediation under any Environmental,  Health and
               Safety Laws; or (b) which is defined, characterized,  identified,
               or  listed  as a  hazardous  waste,  hazardous  substance,  toxic
               substance, infectious waste, solid waste, industrial waste, mixed
               (hazardous  and  radioactive)  waste,  pollutant,  contaminant or
               similar term under any Environmental,  Health and Safety Laws; or
               (c) which is toxic, explosive,  corrosive,  reactive,  ignitable,
               flammable,   infectious,    radioactive,   toxic,   carcinogenic,
               mutagenic,  or otherwise hazardous and is or becomes regulated by
               any governmental  authority as a threat to human health or safety
               or the environment;  or (d) the presence of which on the property
               causes or threatens  to cause a nuisance  upon the property or to
               adjacent  property or poses or  threatens to pose a hazard to the
               health or safety of Persons on or about the property;  or (e) the
               release  of which  on  adjacent  properties  could  constitute  a
               trespass;  or  (f)  which  is  asbestos  or  asbestos  containing
               materials;  or (g)  which is  polychlorinated  biphenyls;  or (h)
               which  contains  petroleum or any  petroleum-derived  products or
               fractions thereof;  or (i) which is dioxin; or (j) which may give
               rise  to   liability  or  is   otherwise   regulated   under  any
               Environmental, Health and Safety Laws.

        3.17   Intellectual Property.

               3.17.1 For purposes of this Section  3.17,  the  following  terms
        shall have the following meanings:







                                     - 16 -

                      3.17.1.1  "Marks"  means names "Gull,"  "Seagull  Design,"
               "Protectoral,"  "Sportstaff,"  ":XTrax," "ONLi" or "GeneSTAR" and
               all fictional  business  names,  trading  names,  registered  and
               unregistered  trademarks,  service marks and applications used in
               the business or owned, used or licensed by Gull;

                      3.17.1.2 "Patents" means the patents, patent applications,
               and inventions and  discoveries  that may be patentable  that are
               used in the business and are owned, used or licensed by Gull;

                      3.17.1.3   "Copyrights"   means  all  copyrights  in  both
               published works and unpublished  works owned, used or licensed by
               Gull;

                      3.17.1.4  "Trade   Secrets"  means  all  know-how,   trade
               secrets,  confidential  information,  customer lists,  internally
               derived or custom software, technical information,  data, process
               technology,  plans,  drawings,  and blue prints  owned,  used, or
               licensed by Gull as licensee or licensor;

                      3.17.1.5  "Software"  means the computer  software and all
               computer  software  code   documentation   commentaries,   owned,
               licensed or used by Gull in the conduct of the business; and

                      3.17.1.6 "Intellectual Property Assets" means collectively
               the Marks, Patents, Copyrights, Trade Secrets and Software.

               3.17.2 The Disclosure  Schedule  contains a complete and accurate
        list and summary  description,  including any royalties paid or received
        by Gull, of all agreements relating to its Intellectual  Property Assets
        to  which  Gull is a party  or by which  Gull is  bound  except  for any
        license applied by the sale of a product and perpetual, paid-up licenses
        for  commonly  available  software  programs  with a value of less  than
        $2,000 under which Gull is a licensee.  There are no outstanding and, to
        Gull's Knowledge,  no threatened  disputes or disagreements with respect
        to any such agreement.

               3.17.3 The Disclosure  Schedule  contains a complete and accurate
        list and summary  description  of all Marks.  Except as set forth in the
        Disclosure  Schedule,  all  Marks  that have  been  registered  with the
        applicable  Trademark  Office  are  valid and  enforceable,  and are not
        subject to any  maintenance  fees or taxes or actions falling due within
        90 days after the Closing  Date.  Except as set forth in the  Disclosure
        Schedule,  Gull has taken  all  necessary  actions  in  accordance  with
        applicable  law to maintain and protect each Mark.  Except as set for in
        the  Disclosure  Schedule,  no Mark has been or is now  involved  in any
        opposition,  invalidation,  or cancellation and, to Gull's Knowledge, no
        such action is threatened with respect to any of the Marks, nor is there
        any potentially  interfering  trademark or trademark  application of any
        third party.







                                     - 17 -

               3.17.4 With respect to the Trade  Secrets  taken as a whole,  the
        documentation  relating to such Trade Secret is current,  accurate,  and
        sufficient in detail and content to identify and explain it and to allow
        its full and proper use without  reliance on the  Knowledge or memory of
        any individual. Gull has taken all reasonable precautions to protect the
        secrecy, confidentiality and value of its Trade Secrets.

               3.17.5 Except as listed on the Disclosure Schedule,  no action is
        pending or, to the Knowledge of Gull,  threatened with respect to Gull's
        ownership of, or potential  infringements  of or any other claims of any
        nature relating to or arising from its  Intellectual  Property Assets or
        the  current  products  of Gull.  None of Gull's  Intellectual  Property
        Assets,  including  current  products  manufactured  by Gull,  infringe,
        violate or constitute a misappropriation, or to the Knowledge of Gull in
        the past infringed,  violated or constituted a misappropriation,  of any
        intellectual  property  rights of any other  Person or  entity.  Neither
        Fresenius nor Gull has received any  complaint,  claim or notice and, to
        Gull's  Knowledge,  there is no basis for any such  complaint,  claim or
        notice.   Gull  has  taken  all  reasonable   measures  to  protect  the
        proprietary  nature  and  value  of  each of the  Intellectual  Property
        Assets,  and to maintain in confidence all Trade Secrets that it owns or
        uses.  No  other  Person  or  entity  has  any  rights  to  any  of  the
        Intellectual Property Assets owned or used by Gull, except for licensors
        of   Intellectual   Property  Assets  to  Gull  or  other  licensees  of
        Intellectual  Property  Assets  to which  Gull has not been  granted  an
        exclusive license, and to Gull's Knowledge, no other Person or entity is
        infringing,  violating  or  misappropriating  any  of  the  Intellectual
        Property Assets of Gull.

               3.17.6  Except  as set  forth  in the  Disclosure  Schedule  with
        respect  to  "GeneSTAR,"  Gull  does  not own or  operate  any  Software
        developed by it or developed by others exclusively for its use.

               3.17.7 The Software included in the Intellectual  Property Assets
        performs  in  accordance  with  the   documentation  and  other  written
        materials used in connection with the Software and is free of defects in
        programming and operation,  is in  machine-readable  form,  contains all
        currently  available computer  programs,  materials,  tapes,  object and
        source codes, other written materials, know-how and processes related to
        the  Software.  Gull has  made  available  to  Meridian  for its  review
        complete  and  correct  copies of all user and  technical  documentation
        related to the Software.

               3.17.8  Fresenius  and Gull have each kept secret and neither has
        disclosed the source code for the Software to any Person or entity other
        than  certain  employees  of  Fresenius  and Gull who are subject to the
        terms of a  binding  confidentiality  agreement  with  respect  thereto.
        Fresenius and Gull have each taken all  appropriate  measures to protect
        the  confidential  and  proprietary  nature of the  Software,  including
        without limitation the use of confidentiality agreements with all of its
        employees  having access to the Software  source and object code.  There
        have been no Patents  applied for and no Copyrights  registered  for any
        part of the Software. There are  no  trademark  rights of any  Person or






                                     - 18 -

      entity in the names "Gull," "Seagull Design," "Protectoral," "Sportstaff,"
      "XTrax," "ONLi" or "GeneSTAR."

               3.17.9 The Software  includes  acceptable  design and performance
        specifications  so that the  Software  will not  abruptly end or provide
        invalid or incorrect  results during the operation of Gull's business on
        or after  January 1, 2000.  The Software is designed to ensure year 2000
        compatibility  and  includes,  but is not limited to, date data  century
        recognition,    calculations   that   accommodate   same   century   and
        multi-century  formulas and date values, date data interface values that
        reflect the century, and includes year 2000 leap year calculations.


        3.18  Disclosure.  The  Proxy  Materials  will  comply  in all  material
respects  with  the  Securities  Exchange  Act  and  the  applicable  rules  and
regulations  thereunder.  None of the information  that Gull will supply that is
included in the Proxy  Materials will, at the time the Proxy Materials are first
mailed  to  Gull's   Stockholders  or  at  the  time  of  the  meeting  of  Gull
Stockholders,  include an untrue statement of a material fact or omit to state a
material fact necessary in order to make the statements therein, in the light of
the  circumstances  under  which they will be made,  not  misleading;  provided,
however,  that Gull makes no  representation  or  warranty  with  respect to any
information that Meridian and the Transitory  Subsidiary supply that is included
in the Proxy Materials.

        3.19  Opinion of  Financial  Advisor.  Gull has  received the opinion of
Houlihan  Valuation  Advisors,  a true and correct  copy of which is attached as
Exhibit E, dated the date of this Agreement (the "Fairness Opinion").

        3.20  Proficiency  Surveys.  Except  as  set  forth  in  the  Disclosure
Schedule,  the supply contract pursuant to which Gull provides test specimens to
the College of American Pathologists'  Proficiency Surveys will not be adversely
affected by completion of the Merger.

        3.21   Products, Inventories and Operations.

               3.21.1  Except  as set  forth  in the  Disclosure  Schedule,  the
        Products  manufactured  by Gull have at all times been  manufactured  in
        compliance in all material  respects with all rules and regulations with
        respect to Good Manufacturing Practices as such may be determined by the
        Federal Food and Drug  Administration  ("FDA") or in compliance with all
        other  applicable  laws of both the United States and non-United  States
        governments  ("GMP  Requirements")  and in  compliance  in all  material
        respects with all representations  made in any submissions to the FDA or
        similar  non-United  States  authorities  concerning or relating to such
        Products,  including submissions to obtain marketing approval.  Gull has
        maintained its registration of its manufacturing  facilities with FDA at
        all times.








                                     - 19 -

               3.21.2   Except  as  set  forth  in  the Disclosure Schedule, the
        finished goods inventories, net  of  reserves  for  excess  and obsolete
        inventories, of the Products at the  Closing  are  in  good,  usable and
        salable condition,  free from any defect, whether latent or patent,  and
        currently of a quality, strength and  purity  which  are  in  conformity
        with applicable FDA regulations  or similar non-United States  laws  and
        regulations. Except as set forth in the Disclosure Schedule,  no article
        in such inventories is adulterated or misbranded  within  the meaning of
        the Federal Food, Drug and  Cosmetic  Act  or  similar non-United States
        laws or regulations  nor  is any  finished  article  contained  in  such
        inventories an article which may not, under the  provisions  of Sections
        404 or 505 of the said Act, be introduced into interstate  commerce  for
        the uses thereof previously made by Gull and all written representations
        with  respect to the  Products made by Gull to its  customers  have been
        in all material  respects true, correct  and  complete.  The inventories
        of finished goods of the Products are  packaged  for resale in customary
        packaging used for those products by Gull.

               3.21.3  Except  as set  forth  in the  Disclosure  Schedule,  the
        manufacture,  use,  distribution and sale by Gull of the Products are in
        accordance  in  all  material   respects  with  the  provisions  of  the
        applicable  authorizations,  comply in all  material  respects  with all
        applicable  laws and regulations and do not interfere with the rights of
        any Person to know-how or to any property  right the  existence of which
        would materially adversely affect the value of the Products.

               3.21.4 Except as set forth in the Disclosure Schedule, since June
        30,  1998,  Gull has not  failed  to file  any  report,  data,  or other
        information with respect to the Products, the materials or the operation
        of Gull's plants where the Products are manufactured that is required to
        be filed with the FDA or any other  federal,  state or local  government
        agency or non-United  States  government  agency,  which failure to file
        would  materially  adversely  affect the Products,  the materials or the
        operations of Gull's plants where the Products are manufactured.  Except
        as disclosed in the Public Reports or the Disclosure  Schedule,  Gull is
        in all material  respects in  compliance  with current  federal,  state,
        state agency and local government and other  governmental and non-United
        States  government  reporting  requirements,  if  any,  relating  to the
        Products,  the materials and the plant  operation where the Products are
        manufactured.

               3.21.5 All information concerning the Products, the materials and
        the  operation of Gull's  plants  where the  Products are  manufactured,
        including  published and  unpublished  data,  relating to the safety and
        efficacy of the  Products,  coming to the attention of Gull or Fresenius
        within two years prior to the Closing  Date not already  listed on other
        Disclosure  Schedules  will be promptly  disclosed to Meridian  prior to
        Closing.

               3.21.6 Schedule  3.21.6 sets forth all FDA Form 483  inspectional
        observations  delivered by the FDA to Gull since June 28, 1994.  Gull is
        currently  in  full  compliance  with  all  FDA  Form  483  inspectional
        observations delivered by the FDA to Gull, or Gull has  delivered  plans






                                     - 20 -

          of correction to the FDA for compliance in all material  respects with
          all observations of  objectionable  conditions and practices listed on
          such FDA Form 483 to the FDA, and such plans of  correction  have been
          completed or are being diligently pursued in accordance with the terms
          and  conditions  agreed  between  the FDA and  Gull  to  correct  such
          objectionable practices identified by the FDA on all such FDA Form 483
          inspectional reports.

        3.22   Formulae, Etc., for Products

               3.22.1 The Disclosure  Schedule  contains a true and correct list
        of the Products in inventory,  those being  manufactured and those being
        sold or distributed by Gull and other products or technology  related to
        the Products.

               3.22.2 With respect to the Products currently being manufactured,
        Gull  has  a  sufficient   combination  of  manufacturing   and  testing
        instructions,  formulae  and  other  documentation  sufficient  for  the
        manufacture   of  such  Products  in  accordance   with  Gull's  current
        manufacturing practices.

        3.23 Expiration Dates.  Except as set forth in the Disclosure  Schedule,
all of the Products bear an expiration date suitable for sale of the Products in
the Ordinary Course of Business which is based upon Gull's available data.

        3.24  Subsidiaries  and Other Capital Stock. The Subsidiaries are listed
in the Disclosure Schedule. Except as set forth in the Disclosure Schedule, Gull
owns all outstanding  securities of each of the Subsidiaries.  No Subsidiary has
outstanding  or authorized  options,  warrants,  purchase  rights,  subscription
rights,  conversion  rights,  exchange  rights or other contracts or commitments
that could require such Subsidiary to issue,  sell, or otherwise cause to become
outstanding any of its capital stock.

        3.25 Real Property.  The Disclosure Schedule sets forth a description of
all real  property  of Gull owned,  leased or subject to a purchase  contract or
lease  commitment,  detailing  which  properties are owned and which are leased,
with a brief  description  of all buildings and  structures  thereon  (sometimes
collectively  the "Real  Property").  A list of all such  purchase  contracts or
leases  is  contained  in the  Disclosure  Schedule.  With  respect  to the Real
Property that is owned by Gull and identified on the Disclosure Schedule,  title
to such Real  Property  is, and at the  Effective  Time shall be,  except to the
extent identified in the Disclosure Schedule,  good and marketable,  fee simple,
free and clear of all liens,  encumbrances,  adverse  claims  and other  matters
affecting  Gull's title to or possession of such Real Property,  including,  but
not limited to, all encroachments,  boundary disputes, covenants,  restrictions,
easements,  rights of way, mortgages,  security interests,  leases, encumbrances
and title objections, excepting only (i) liens for real estate taxes not yet due
and payable and (ii) such  easements,  restrictions  and covenants  presently of
record which will not, in  Meridian's  sole  judgment  (which  judgment  will be
exercised  prior to Closing  to the  extent  such  easements,  restrictions  and







                                     - 21 -

covenants  have been disclosed in the  Disclosure  Schedule),  interfere with or
impair  Meridian's  intended use of any of the Real Property or reduce the value
of any of the Real Property,  which  easements,  restrictions  and covenants are
listed on the Disclosure Schedule in a manner so that the Real Property to which
they relate is readily identifiable (collectively the "Permitted Encumbrances").
At  Closing,  title to the Real  Property  owned by Gull shall be  insurable  by
Meridian by a title insurance company  reasonably  satisfactory to Meridian,  at
such  company's  regular rates  pursuant to an ALTA 1987 owner's form of policy,
free  of  all  exceptions  except  the  aforesaid  easements,  restrictions  and
covenants to the extent not objectionable to Meridian.  A list of existing title
insurance policies is contained in the Disclosure Schedule.  Except as set forth
in the Disclosure Schedule,  all Real Property and the buildings located thereon
are in  compliance  in all material  respects  with  applicable  zoning laws and
regulations.  All  buildings  and  structures  owned or leased by Gull,  and the
mechanical  components  (including HVAC systems),  roofs, fixtures and equipment
located  therein or thereon,  are now,  and at the Closing Date will be, in good
operating  condition and repair,  subject only to normal maintenance and repair,
fit for the uses for which they are intended,  and no material repairs will need
to be made as of the Closing  Date to  continue  the use of such  buildings  and
structures as presently used.

        3.26  Equipment.  Gull  shall  deliver  to  Meridian  prior to Closing a
computer  generated  asset  register  which  will  list  all  material  items of
machinery,  equipment and similar property, including vehicles, owned by Gull on
the Closing Date. All such machinery,  equipment and similar property, including
vehicles,  shall be in good  working  order on the Closing  Date.  Except as set
forth in the Disclosure  Schedule,  all equipment  owned by Gull and placed with
customers  has been  validated  for the  specific  Gull  tests  that run on that
equipment.

        3.27  Contracts and  Agreements.  The  Disclosure  Schedule sets forth a
description of all contracts and  agreements,  whether  written or oral, and all
amendments thereto or modifications thereof to which Gull is a party or by which
it is bound,  which  involve  future  payments by or to Gull of $25,000 or more,
other than  contracts  which are  terminable  by Gull upon  thirty  days or less
notice without cost or expense to Gull, and all notes, mortgages, pledges, deeds
of trust,  security,  loan or  credit  agreements  and  similar  instruments  or
arrangements to which Gull is a party or by which it is bound and all amendments
or modifications thereof  (collectively the "Contracts"),  together in each case
with copies of all such agreements,  contracts and other instruments as Meridian
may reasonably request. Except as set forth in the Disclosure Schedule:

               3.27.1 Each  Contract is a valid and  binding  agreement  of Gull
        and, to the best of Gull's  Knowledge,  is a valid and binding agreement
        of the other parties thereto;

               3.27.2 Gull has fulfilled all  obligations  required  pursuant to
        each  Contract to have been  performed  by Gull on its part prior to the
        date hereof,  and Gull has no reason to believe that it will not be able
        to fulfill, when due, all of Gull's obligations under the Contracts that
        remain to be performed after the date hereof; and







                                     - 22 -

               3.27.3 There has not  occurred any default  under any Contract on
        the part of Gull;  Gull  does not have any  Knowledge  that any  default
        under  any  Contract  on the  part  of the  other  parties  thereto  has
        occurred;  and  Gull  does not have any  Knowledge  that any  event  has
        occurred  which with the giving of notice or the lapse of time, or both,
        would constitute any default under any of the Contracts.

        3.28  Accounts  Receivable.  All  accounts  receivable  of Gull that are
reflected  in the  financial  statements  contained  in the 1998  10-Q are valid
obligations  arising from sales actually made or services actually  performed in
the ordinary  course of business of Gull.  Except as set forth on the Disclosure
Schedule,  there is no contest, claim or right of set-off, other than returns in
the ordinary course of business of Gull,  under any contract or arrangement with
any obligor of an accounts receivable relating to the amount or validity of such
accounts receivable.

        3.29 Licenses and Permits. The Disclosure Schedule sets forth a list of,
and  Gull is in  possession  of,  all  licenses,  permits  for the  development,
manufacture  and marketing of products  pursuant to such licenses and permits of
Gull,  other  than any  permit,  the  absence  of which does not have a material
adverse effect upon the business,  financial condition or prospects,  and states
that the permits are valid and in full force and effect.  Except as set forth in
the Disclosure Schedule, Gull is in compliance in all material respects with all
conditions or requirements imposed by or in connection with the permits and with
respect to the  conduct of its  business.  Gull has  received  no notice of, and
there is not to the Knowledge of Gull,  any reason to believe that any authority
intends to  cancel,  terminate  or modify any of the  permits or adopt or modify
rules and regulations which would adversely affect the permits.

        3.30 Taxes and Tax Returns.  Gull will,  between the date hereof and the
Closing Date,  and through the date of this Agreement has, duly and timely filed
all federal,  state and local (United States and all foreign  jurisdictions) tax
returns required to be filed by it (unless a valid extension  therefore has been
granted),  and all such returns are, or will be when filed,  true,  complete and
correct in all  material  respects.  Gull has, or will have prior to the Closing
Date,  duly and timely paid or made  adequate  provision  for the payment of all
taxes,  assessments and other  governmental  charges which have been incurred as
set forth in the  aforementioned  tax returns or are  otherwise  due and payable
with respect to periods  ending on or prior to the Closing Date. All sales taxes
required through the date of this Agreement to be collected and remitted by Gull
have been properly  collected and remitted.  All sales taxes will continue to be
properly  collected and remitted to the extent  required,  up to and through the
Closing Date. All necessary sales tax exemption  certificates have been obtained
by Gull and all such certificates  have been properly  completed and maintained.
No tax return, except as set forth in the Disclosure Schedule,  filed by Gull is
under audit or examination by any taxing authority and there are no applications
or agreements  for the extension of the time for the filing of any tax return or
for the  assessment of any amounts of tax nor any consent to an extension of the
period of limitations  applicable to such assessment or to the collection of any
tax. No issues have been raised in connection  with any prior or pending inquiry
into, or audit of, any tax filings of Gull which may be expected to be raised in
the future by such taxing authorities and no facts exist or have  existed  which






                                     - 23 -

would  constitute  grounds for the  assessment  of any further tax  liabilities,
which  individually or in the aggregate are material with respect to the periods
which  have  not  been  examined  by  the  taxing   authority  of  the  relevant
jurisdiction.  Gull has made  available to Meridian true and complete  copies of
all United  States  federal,  state and local income tax returns and similar tax
returns filed with non-United States  jurisdictions  which it has filed for each
of the past three years as set forth in the  Disclosure  Schedule  together with
copies of all schedules,  work papers, elections, tax depreciation schedules and
other  documents  which were used in the  preparation  of each such tax  return.
There are no liens for taxes upon the assets of Gull  except for liens for taxes
not yet due. As used herein,  "taxes" mean all net income,  gross income,  gross
receipts, value added, sales, use, transfer,  franchise,  profits,  withholding,
payroll, employment,  excise, severance,  property or windfall profits taxes, or
other  taxes  of any  kind  whatsoever,  together  with  any  interest  and  any
penalties,  additions  to tax  or  additional  amounts  imposed  by  any  taxing
authority,  domestic or non-United States, upon Gull with respect to all periods
or portions  thereof ending on or before the Effective Time and/or any liability
of Gull for the payment of any amounts of the type described in the  immediately
preceding  clause  as a result of being a member of an  affiliated  or  combined
group or a Controlled Group of Corporations.

        3.31  Transactions  With  Affiliates.  Except as set forth in the Public
Reports  or the  Disclosure  Schedule  and  except  for  compensation  or  other
customary  employee benefits provided in the Ordinary Course of Business,  since
December  31,  1997,  Gull  has  not  entered  into,  or been a  party  to,  any
transaction  with a value in excess of $5,000  which  provided for payment to or
from, or the transfer of, any property of Gull to or from any Gull Stockholders,
any director,  officer or other employee of Gull, to any member of the family of
any such Person or to any  corporation,  partnership,  trust or other  entity in
which any such Person has an  ownership  interest  or is an  officer,  director,
partner or trustee.

        3.32  Compliance  with  Applicable  Law.  Except  as  set  forth  in the
Disclosure Schedule,  Gull is conducting and has conducted its business so as to
comply,  in  all  material  respects  with  all  applicable  laws,   ordinances,
regulations,  decrees  and  orders,  of any  governmental  entity,  domestic  or
non-United  States,  including without  limitation  compliance with the National
Labor Relations Act, as amended,  the Welfare and Pension Plans  Disclosure Act,
the Fair Labor  Standards Act and Equal Pay Act, Title 7 of the Civil Rights Act
of 1964,  the Age  Discrimination  in Employment Act of 1967, and any other law,
ordinance, regulation, decree or order, except, in each case, for any failure to
comply which is not reasonably  likely to have a material  adverse effect on the
financial condition, business, properties,  reputation, results of operations or
prospects of Gull, Meridian and the Transitory Subsidiary.

        3.33 General Disclosure  Matters.  No representation or warranty by Gull
contained in this Agreement,  the Disclosure  Schedule attached hereto or in any
statement or  certification  furnished  or to be furnished to Meridian  pursuant
hereto or in connection with the transactions  contemplated hereby,  contains or
will contain any untrue  statement  of a material  fact or omits or will omit to
state a material  fact  necessary  to make the  statements  contained  herein or
therein not misleading.






                                     - 24 -

        3.34  Other  Disclosures.  Notwithstanding  the  foregoing  Section  3.1
through Section 3.33, if Meridian has actually  received notice of or has actual
knowledge of a fact or matter,  such fact or matter shall be deemed to have been
disclosed to Meridian as required by this Agreement.

        4.  Representations  and  Warranties  of  Meridian  and  the  Transitory
Subsidiary.  Each of  Meridian  and the  Transitory  Subsidiary  represents  and
warrants to Gull and Fresenius that the statements contained in this Section are
correct and complete as of the date of this Agreement.

        4.1   Organization.   Meridian  and  the   Transitory   Subsidiary   are
corporations each duly organized,  validly existing,  and in good standing under
the laws of Ohio and Utah,  respectively.  The Transitory  Subsidiary was formed
solely for the purpose of engaging in the transactions  contemplated hereby, has
engaged in no other business activities and has conducted its operations only as
contemplated hereby. Meridian has full corporate power and authority to carry on
the business in which it is engaged and to own and use the properties  owned and
used by it.

        4.2  Authorization  of Transaction.  Each of Meridian and the Transitory
Subsidiary  has full power and  authority to execute and deliver this  Agreement
and  to  perform  its  obligations  hereunder.   The  execution,   delivery  and
performance of this Agreement by Meridian and the Transitory  Subsidiary and the
consummation by Meridian and the Transitory  Subsidiary of the Merger and of the
other  transactions  contemplated  hereby  have  been  duly  authorized  by  all
necessary   corporate  action  on  the  part  of  Meridian  and  the  Transitory
Subsidiary.  No vote of  Meridian's  stockholders  is required  to approve  this
Agreement or the transactions  contemplated hereby. This Agreement has been duly
executed and delivered by Meridian and the Transitory  Subsidiary and,  assuming
this Agreement constitutes a valid and binding obligation of Gull and Fresenius,
constitutes  a  valid  and  binding  obligation  of  each  of  Meridian  and the
Transitory Subsidiary enforceable against Meridian and the Transitory Subsidiary
in  accordance  with its terms,  subject to applicable  bankruptcy,  insolvency,
moratorium or other similar laws relating to creditors'  rights generally and to
general principles of equity.

        4.3  Noncontravention.  Except  for  filings,  permits,  authorizations,
consents  and  approvals  as  may  be  required  under,   and  other  applicable
requirements  of, the Securities  Exchange Act, the  Hart-Scott-Rodino  Act, the
laws of Utah,  the laws of other  states in which Gull is  qualified to do or is
doing business and state takeover laws, and except for the filing of Articles of
Merger with the Utah Division of Corporations and Commercial  Code,  neither the
execution  and the  delivery  of this  Agreement,  nor the  consummation  of the
transactions  contemplated  hereby,  will  violate  any  constitution,  statute,
regulation, rule, injunction,  judgment, order, decree, ruling, charge, or other
restriction of any  government,  governmental  agency,  or court to which either
Meridian or the Transitory Subsidiary is subject or any provision of the charter
or Bylaws of either  Meridian or the  Transitory  Subsidiary  or conflict  with,
result in a breach of,  constitute a default under,  result in the  acceleration
of, create in any party the right to accelerate,  terminate,  modify, or cancel,
or require any notice under any agreement,  contract, lease, license, instrument







                                     - 25 -

or other arrangement to which either Meridian or the Transitory  Subsidiary is a
party or by which it is bound or to which any of its assets is  subject,  except
where the  violation,  conflict,  breach,  default,  acceleration,  termination,
modification,  cancellation, or failure to give notice would not have a material
adverse  effect on the ability of the  Parties to  consummate  the  transactions
contemplated by this Agreement.

        4.4 Brokers' Fees.  Neither  Meridian nor the Transitory  Subsidiary has
any liability or obligation to pay any fees or commissions to any broker, finder
or agent with respect to the  transactions  contemplated  by this  Agreement for
which  any of Gull,  Fresenius  or their  Subsidiaries  could  become  liable or
obligated.

        4.5 Disclosure. None of the information that Meridian and the Transitory
Subsidiary will supply  specifically for use in the Proxy Materials will contain
any  untrue  statement  of a  material  fact or omit to  state a  material  fact
necessary  in order to make the  statements  made  therein,  in the light of the
circumstances under which they will be made, not misleading.

        4.6  Litigation.  As of the  date of this  Agreement,  there is no suit,
claim,  action,  proceeding  or  investigation  pending or, to the  Knowledge of
Meridian and the Transitory  Subsidiary,  threatened  against Meridian or any of
its  Subsidiaries  that could  reasonably  be expected to prevent or  materially
delay the consummation of the Merger. As of the date of this Agreement,  neither
Meridian nor any of its Subsidiaries is subject to any outstanding  order, writ,
injunction or decree that could  reasonably be expected to prevent or materially
delay the consummation of the Merger.

        4.7 Available Funds. At the closing, Meridian will have sufficient funds
available to pay the Merger  consideration  and to fulfill and satisfy its other
obligations to Fresenius under this Agreement.

        5. Representations and Warranties of Fresenius. Fresenius represents and
warrants to  Meridian  that the  statements  contained  in this  Section and the
representations  and  warranties  of  Gull  set  forth  in  Section  3  and  the
accompanying Disclosure Schedule are correct and complete as of the date of this
Agreement  provided that matters  represented to Knowledge of Gull shall in this
respect  be  represented  to the  Knowledge  of  Fresenius  based on the  actual
Knowledge  of Rainer  Baule or Yorck  Schmidt.  Nothing in this  Section 5 shall
constitute a representation by Fresenius as to the Knowledge of Gull.

        5.1 Organization.  Fresenius is a corporation duly organized and validly
existing under the laws of Germany.

        5.2 Authorization of Transaction. Fresenius has full corporate power and
authority to execute and deliver this  Agreement and to perform its  obligations
hereunder.  The  execution,  delivery  and  performance  of  this  Agreement  by
Fresenius  and  the   consummation  by  Fresenius  of  the  other   transactions
contemplated  hereby have been duly authorized by all necessary corporate action
on the part of  Fresenius  and no  other  corporate  proceedings  on the part of







                                     - 26 -

Fresenius  are  necessary  to authorize  this  Agreement  or to  consummate  the
transactions so  contemplated,  subject to approval by the Supervisory  Board of
Fresenius.  No vote of  Fresenius'  stockholders  is  required  to approve  this
Agreement or the transactions  contemplated hereby. This Agreement has been duly
executed and delivered by Fresenius and,  assuming this Agreement  constitutes a
valid and binding  obligation of Gull,  Meridian and the Transitory  Subsidiary,
constitutes  a valid and binding  obligation  of Fresenius  enforceable  against
Fresenius  in  accordance  with its  terms,  subject to  applicable  bankruptcy,
insolvency,  moratorium  or other  similar laws  relating to  creditors'  rights
generally and to general principles of equity.

        5.3 Brokers'  Fees.  Fresenius has no liability or obligation to pay any
fees  or  commissions  to any  broker,  finder  or  agent  with  respect  to the
transactions  contemplated  by this  Agreement  for  which  any of Gull  and its
Subsidiaries could become liable or obligated.

        5.4  Disclosure.  None of the  information  that  Fresenius  will supply
specifically for use in the Proxy Materials will contain any untrue statement of
a material fact or omit to state a material fact  necessary in order to make the
statements made therein, in the light of the circumstances under which they will
be made, not misleading.

        5.5 Ownership of Stock of Gull Shares.  Fresenius  warrants that it owns
4,930,693  Gull Shares free,  clear and  unencumbered  and has sole voting power
with respect to all of such Gull Shares.

        5.6  Transactions  with  Gull.  The  Public  Reports  or the  Disclosure
Schedule sets forth all material  business  arrangements or  relationships  that
Fresenius or any of its Affiliates have had with Gull or any of its Subsidiaries
since January 1, 1997. Except as set forth in the Disclosure  Schedule,  neither
Fresenius nor any of its Affiliates  owns any asset used in the business of Gull
and its Subsidiaries.

        6.  Covenants.  The Parties  agree as follows with respect to the period
from and after the execution of this Agreement.

        6.1 General. Each Party will use its reasonable best efforts to take all
actions  and to do all  things  necessary,  proper,  or  advisable  in  order to
consummate and make effective the  transactions  contemplated  by this Agreement
including  satisfaction,  but not waiver, of the closing conditions set forth in
Section 8.

        6.2 Notices and  Consents.  Gull will give any  notices,  and will cause
each of its Subsidiaries to give any notices,  to third parties and will use its
reasonable  best efforts to obtain,  and will cause each of its  Subsidiaries to
use its  reasonable  best  efforts to obtain,  any third  party  consents,  that
Meridian  reasonably may request in connection  with the matters  referred to in
Section 3.4.








                                            - 27 -

     6.3 Regulatory  Matters and  Approvals.  Each of the Parties will, and Gull
will cause each of its  Subsidiaries  to,  give any notices to, make any filings
with,  and use  its  reasonable  best  efforts  to  obtain  any  authorizations,
consents,  and approvals of governments and governmental  agencies in connection
with the matters  referred to in Section Section 3.4 and 4.3.  Without  limiting
the generality of the foregoing:

               6.3.1  Securities  Exchange  Act.  Gull will  promptly  after the
        execution of this  Agreement  prepare and file with the SEC  preliminary
        proxy materials and any other  statements or filings  required under the
        Securities  Exchange  Act  relating  to  the  special  meeting  and  the
        transactions  contemplated hereunder (the "SEC Filings").  Gull will use
        its  reasonable  best  efforts  to respond  to the  comments  of the SEC
        thereon and will make any further  filings in connection  therewith that
        may  be  necessary,  proper  or  advisable.   Meridian,  the  Transitory
        Subsidiary and Fresenius will provide Gull with whatever information and
        assistance in connection with the foregoing filings that Gull reasonably
        may request.  Each of Gull,  Meridian,  the  Transitory  Subsidiary  and
        Fresenius  shall  correct  promptly  any such  information  specifically
        provided  by it which  shall  have  become  false or  misleading  in any
        material  respect.  Gull  shall take all steps  necessary  to file or to
        cause to be filed with the SEC and have cleared by the SEC any amendment
        or supplement to the  preliminary  proxy  statement so as to correct the
        same and to cause the Proxy Statement as so corrected to be disseminated
        to Gull  Stockholders,  in each case as and to the  extent  required  by
        applicable law.

               6.3.2 Special  Meeting.  Gull will call a special meeting of Gull
        Stockholders,  as soon as  reasonably  practicable  in order  that  Gull
        Stockholders  may consider and vote upon the adoption of this  Agreement
        and the  approval  of the  Merger in  accordance  with the Utah  Revised
        Business  Corporation  Act.  Gull will mail the Proxy  Materials  to its
        Stockholders as soon as reasonably  practicable  after clearance thereof
        by the SEC. Gull shall, through its Board of Directors, recommend to its
        Stockholders  adoption of this  Agreement and approval of the Merger and
        shall not withdraw such recommendation;  provided,  however, that Gull's
        Board of  Directors  shall not be required to make and shall be entitled
        to  withdraw  such  recommendation  if the  Fairness  Opinion  shall  be
        withdrawn or if Gull's Board of Directors reasonably concludes,  for any
        other reason,  in good faith after  consultation  with, and based on the
        advice of, its  outside  counsel,  that the making of or the  failure to
        withdraw,  such recommendation  would be inconsistent with the fiduciary
        obligations of Gull's Board of Directors under applicable law.

               6.3.3  Hart-Scott-Rodino  Act.  Meridian and Fresenius  will file
        Notification  and Report  Forms and  related  material  with the Federal
        Trade  Commission  and  the  Antitrust  Division  of the  United  States
        Department of Justice under the Hart-Scott-Rodino Act, and each will use
        its  reasonable  best  efforts to obtain,  an early  termination  of the
        applicable  waiting period,  and will make any further filings  pursuant
        thereto that may be necessary, proper, or advisable.







                                     - 28 -

     6.4 Operation of Business.  Gull will, and will cause its  Subsidiaries to,
engage only in practices,  and only take actions,  or enter into transactions in
the Ordinary Course of Business. In addition, during the period from the date of
this Agreement  through the Effective  Time, Gull will not and will not cause or
permit  any of its  Subsidiaries  to do any of the  following  without,  in each
instance,  the prior  written  consent of Meridian,  which  consent shall not be
withheld unreasonably:

               6.4.1 none of Gull and its Subsidiaries  will authorize or effect
        any change in its Articles of Incorporation, Charter or Bylaws;

               6.4.2 none of Gull and its  Subsidiaries  will grant any options,
        warrants, or other rights to purchase or obtain any of its capital stock
        or issue,  sell, or otherwise dispose of any of its capital stock except
        upon the  exercise  of options,  warrants,  and other  rights  currently
        outstanding;

               6.4.3 none of Gull and its Subsidiaries will declare,  set aside,
        or pay any dividend or  distribution  with respect to its capital stock,
        whether in cash or in kind, or redeem,  repurchase, or otherwise acquire
        any of its capital stock other than  repurchases of outstanding  options
        to purchase Gull Shares;

               6.4.4  none of Gull and its  Subsidiaries  will  issue  any note,
        bond,  or other debt  security or, other than in the Ordinary  Course of
        Business,  create,  incur,  assume or  guarantee  any  indebtedness  for
        borrowed  money or  capitalized  lease  obligation  except for financing
        provided by  Fresenius  and except for  extensions  or  refinancings  of
        existing indebtedness;

               6.4.5 none of Gull and its Subsidiaries  will impose or permit or
        cause to be imposed any Security Interest upon any of its assets outside
        the Ordinary Course of Business;

               6.4.6 other than purchases of inventory in the Ordinary Course of
        Business,  none of Gull  and its  Subsidiaries  will  make  any  capital
        investment  in, make any loan to, or acquire the securities or assets of
        any other  Person in  amounts  exceeding  $10,000  in any one or related
        group of transactions;

               6.4.7 none of Gull and its  Subsidiaries  will make any change in
        employment  terms,  policies or  practices  for any of its  directors or
        officers or make any change in employment  terms,  policies or practices
        for its non-officer employees outside the Ordinary Course of Business;

               6.4.8  none of Gull and its Subsidiaries will commit to do any of
        the foregoing; and

               






                                     - 29 -

          6.4.9 Gull shall preserve all manufacturing instructions, formulae and
     other documentation and all available  information  concerning the Products
     under   development  and  shall  disclose  to  Meridian  all  manufacturing
     processes and Trade Secrets possessed by Gull relating to the Products.

        6.5  Continuance  of  Operations.  Gull will, and will cause each of its
Subsidiaries  to, use its  reasonable  efforts to keep its business and property
substantially intact, including its present operations, its physical facilities,
working  conditions  and  relationships  with  lessors,  licensors,   suppliers,
customers and employees and operate so as to maintain the levels of finished and
raw goods inventory and sales activity  consistent with its practices during the
preceding twelve months. Gull shall take such steps as are appropriate so at the
closing it will have on hand  finished  goods  inventory of the Products  listed
below, which represent approximately 80% of Gull's sales on a unit basis, during
the six months ended  September 9, 1998,  and which will be  sufficient  to meet
normal sales demand for the next four months following the Closing Date.
The listing of products is:


ANALYTE                                         H2E150-E/EIA HSV 2 IgM
XX715-E/GULLSORB                                EA101-E/IFA EBV-EA
EBE150/EIA EBV IgM PEMA                         EB211-E/IFA EBV IgG
4870311/EIA EBV IgG PEMA                        RBE100-E/EIA RBOLA IgG
EBE150-E/EIA EBV IgM                            XX710-E/GULLSORB
4870011/IFA EBV IgG PEMA                        LDE150/EIA LYME IgM
EB100-E/IFA EBV IgG                             EB251-E/IFA EBV M PCK
4870031/IFA EBV IgM PEMA                        RUE100-E/EIARBELA IgG
EBE100/EIA EBV IgG                              H2I101-E/EIA HSVTS IgG
EB150-E/IFA EBV IgM                             EN100-E/IFA EBNA
XX71AN/GULLSORB PEMA                            VZE101-E/EIA VZV QQ
4870331/EIA EBNA PEMA                           CME150-E/EIA CMV IgM
TCE100-E/EIA CHAGAS                             H2E100-E/EIA HSV IgG
4870321/EIA EBV IgM PEMA                        CME100/EIA CMV IgG
H1E150-E/EIA HSV 1 IgM


     6.6 Due  Diligence.  Fresenius  and Gull will each,  and will cause  Gull's
Subsidiaries to, permit representatives of Meridian to have reasonable access at







                                     - 30 -

reasonable times upon reasonable notice to all premises, properties,  personnel,
books, records including tax records,  contracts, and documents of or pertaining
to each of Gull and its  Subsidiaries.  Such parties will also furnish  Meridian
and its  representatives  with all such  information  and  data  concerning  the
affairs of Gull as Meridian  reasonably may request for the purpose of verifying
the  representations  and warranties made herein and further  investigating  the
business and affairs of Gull. In furtherance thereof, Gull will permit Meridian,
in a manner  approved by Gull, to make contact with all members of management of
Gull and its Subsidiaries, with their customers and with such other Persons with
which Gull has been conducting  business.  The performance of this due diligence
by  Meridian  will  be  conducted  as  expeditiously  as  practical.  Meridian's
performance of due diligence of the acquisition of information by Meridian shall
not relieve Gull or Fresenius from any representation, warranty or covenant made
by either of them in this  Agreement.  Fresenius or Gull will  provide  Meridian
with the appropriate occupancy upon commercially  reasonable terms in the German
facilities of Fresenius or Gull until the closing.  All information  obtained by
Meridian or the Transitory  Subsidiary  pursuant to this Agreement shall be kept
confidential in accordance with the Confidentiality Agreement dated November 18,
1997 between Gull and Meridian (the "Confidentiality  Agreement"). Each of Gull,
Meridian and the Transitory  Subsidiary  hereby expressly  affirms the terms of,
and acknowledges that it is bound by, such Confidentiality  Agreement and agrees
and acknowledges that such terms and the Confidentiality Agreement shall survive
the termination of this Agreement.

        6.7 Notice of  Developments.  Each Party will give prompt written notice
to the others of any material adverse development causing a breach of any of its
own  representations and warranties in Section Section 3, 4 and 5. No disclosure
by any Party  pursuant  to this  Section,  however,  shall be deemed to amend or
supplement the Disclosure Schedule or to prevent or cure any  misrepresentation,
breach  of  warranty,  or  breach  of  covenant  unless  the  Party  closes  the
transaction after receipt of such written disclosure.

        6.8 Exclusivity. Each of Fresenius and Gull will not, and will not cause
or permit any of its employees or agents to, solicit, initiate, or encourage the
submission  of any  proposal  or offer from any Person  relating  to a tender or
exchange offer, a merger,  consolidation or other business combination involving
Gull or any of its  Subsidiaries  or any  proposal  to  acquire  in any manner a
substantial equity interest in, or substantial portion of the assets of, Gull or
any of its  Subsidiaries  (a  "Third  Party  Offer");  provided,  however,  that
Fresenius,  Gull and their  respective  directors  and  officers  may  engage in
discussions or negotiations with, or furnish information concerning Gull and its
properties, assets and business to any Person which makes a Third Party Offer if
the  Board  of  Directors  of Gull  reasonably  concludes  in good  faith  after
consultation  with,  and based on the advice of, its outside  counsel,  that the
failure to take such action would be inconsistent with the fiduciary obligations
of such Board of Directors  under  applicable  law; and provided  further,  that
notwithstanding  anything  to  the  contrary  herein  contained,  the  Board  of
Directors  of Gull  may  take  and  disclose  to Gull  Stockholders  a  position
contemplated by Rule 14e-2 promulgated under the Securities Exchange Act, comply
with Rule 14d-9  thereunder and make all disclosures  required by applicable law
in  connection  therewith  and such actions  shall not be considered a breach of







                                     - 31 -

this Section of this Agreement.  Gull shall promptly,  but in no case later than
48 hours,  notify  Meridian  of a decision by Gull to engage in  discussions  or
negotiations  with, or furnish  information  concerning  Gull or its properties,
assets or  business  to, any Person or of the  receipt of any Third  Party Offer
providing Meridian with a summary of the material terms thereof and the identity
of the offeror.  Gull shall afford  Meridian two business days to respond with a
counteroffer  to  any  Third  Party  Offer.  Should  this  process  result  in a
substantial  amount of assets or stock of Gull being sold to another party, Gull
and Fresenius will be jointly and severally  obligated to pay Meridian  $350,000
to  compensate  Meridian  for its time and  costs  involved  in the  transaction
contemplated  by this  Agreement.  Any such  payment  will be made  promptly  in
immediately available United States funds.

        6.9  Bylaw  Indemnification.  The  Bylaws  of  Gull,  as  the  surviving
corporation,  shall contain the provisions with respect to  indemnification  set
forth in the  Articles of  Incorporation  and Bylaws of Gull on the date of this
Agreement, which provisions shall not be amended, repealed or otherwise modified
for a period of five years  after the  Effective  Time in any manner  that would
adversely  affect the rights  thereunder of Persons who at any time prior to the
Effective Time were prospective  indemnitees under the Articles of Incorporation
or Bylaws of Gull in respect of actions or  omissions  occurring  at or prior to
the Effective Time, including, without limitation, the transactions contemplated
by this Agreement,  unless such modification is required by law. For a period of
five years after the Effective Time,  Meridian will reimburse  Fresenius for its
actual  out-of-pocket  costs for the  maintenance  of "tail  coverage" of Gull's
officers and directors pursuant to Fresenius' existing insurance policy covering
such  matters to the extent that such  coverage  may be  purchased  with premium
payments for such tail coverage  established  as of the Closing Date or Meridian
may,   at  its   option,   maintain   such   coverage   with  a  United   States
nationally-recognized insurer.

        6.10 Closing Balance Sheet. At Meridian's  expense,  Gull will prepare a
balance sheet as of the Closing Date in accordance with GAAP, except as provided
in Section 6.11, which will be audited by Arthur Andersen LLP in accordance with
generally  accepted  auditing  standards.  Matters which are subject to judgment
will be  treated  in a  manner  consistent  with  Gull's  historical  accounting
practices provided such practices are in accordance with GAAP.

        6.11   Value of Certain Gull Assets.

               6.11.1 Subject to Section  Section  6.11.2 and 6.11.3,  Fresenius
        and Gull  represent and covenant  that the balance sheet  prepared as of
        the Closing Date will contain the values shown for the following  assets
        adjusted to reflect the  proceeds  from any  realization  of such assets
        since  May  31,  1998  recorded  in  a  manner  consistent  with  Gull's
        historical accounting practices:






                                     - 32 -



             ASSETS                                           VALUE

Hodges Accounts Receivable                     0 - Gull to write off
Dental Protocol Patent Corp.                   0 - Gull to write off
Standard Engineering Purchase Deposit          0 - Gull to write off
Hypreps                                        0
MRX's                                          0
Omni's and Components                          0 - Gull to write off
Duets Instruments                              $1,091,000
Duet Components and Miscellaneous              $146,000
Equipment, Inventory and Certifications
Bio Lab 300 -200                               $320,000
Instrumentation Classed as fixed asset         $472,000
Notes Receivable - Instruments                 $900,000
Bartels Accounts Receivable                    $180,000
Inventory                                      To be based on physical inventory
                                               in the audited balance sheet 
                                               specified in Section 6.10
Deferred Tax Assets and Income Tax Refund      1,000,000
Receivable

               6.11.2 Duet Instrument Sales.  Commencing on the Closing Date and
        continuing  through  December  30, 1999,  Meridian  shall use, and shall
        cause Gull to use, its and Gull's respective best commercial  efforts to
        effect  sales  and  rental  placements  of  Duet  Instruments.  Provided
        Meridian shall have satisfied its obligations under this Section 6.11.2,
        Meridian shall be entitled to offset  against the principal  installment
        of the Meridian Note due December 31, 1999 an amount equal to $1,091,000
        minus the historical  acquisition  cost of all Duet  Instruments sold or
        placed under rental agreements by Gull,  Meridian and their Subsidiaries
        during such period,  provided,  however, that the maximum amount of such
        offset shall be $545,000.

               6.11.3  Deferred  Tax  Assets;   Income  Tax  Refund  Receivable.
        Meridian  shall  be  entitled  to  offset  against  the  installment  of
        principal of the Meridian  Note due December 31, 1999 a sum equal to the
        amount by which $1,000,000 exceeds the portion of Gull's






                                     - 33 -

        deferred  tax  assets  and  income  tax  refund   receivable  which,  in
        accordance  with the advice of Arthur Andersen Europe is, was or will be
        in the  future  available  for  utilization  by  Meridian  or any of its
        Subsidiaries  prior to December 31, 1999,  provided,  however,  that the
        maximum  amount of any such offset shall be $500,000.  As a condition to
        Meridian's  right of offset  pursuant to this Section  6.11.3,  Meridian
        shall deliver to Fresenius,  on or before  December 30, 1999, an opinion
        of Arthur  Andersen  Europe  stating  that the  deferred  tax assets and
        income  tax  refund  receivable  are  not,  were  not  and  will  not be
        technically  available in the future for  utilization by Meridian or its
        Subsidiaries.

        6.12 WARN Act Compliance;  Severence Obligations.  Meridian shall comply
with the Worker  Adjustment and Retraining  Notification Act of 1988 or it shall
pay all  wages,  benefits  and fines and  other  amounts  due as a result of its
failure to do so.  Gull shall use its best  efforts to cause  commitments  to be
made by such employees of Gull as Meridian deems necessary to remain employed by
Gull.  Meridian  shall be  responsible  for all severance  pay,  costs to cancel
outstanding  options to purchase Gull Common Stock held by Gull employees and by
Eugene  Malone or other  payments  in lieu of  compensation  due and payable and
required to be paid with respect to any employees of Gull  terminated  after the
closing.

        6.13 Service and Other  Arrangements.  All service  agreements,  leases,
licenses  and other  agreements  similar  in nature  between  Fresenius  and its
Subsidiaries  and Gull and its  Subsidiaries  will  continue  in full  force and
effect subject to the right, after the Closing Date, of Gull or its Subsidiaries
to cancel any or all such  agreements  from time to time prior to termination by
their terms upon 30 days written notice to Fresenius.  Any inventory of Gull not
relabeled by the Closing Date may continue to be sold with a Fresenius  label or
relabeled at Fresenius' expense.

        6.14 Closing Deliveries.  The Share Pledge Agreement dated July 17, 1997
by and between Gull Laboratories,  Inc. and Fresenius AG will be released at the
closing  upon  Fresenius's  receipt of any  Meridian  Note due  pursuant to this
Agreement.

        6.15 Further  Meridian  Obligations.  Meridian shall take all reasonable
steps at its expense to provide the  College of American  Pathologists  with the
information  necessary  for the College of American  Pathologists  to  determine
whether to give its written consents called for in Section 8.2.13 for Meridian's
assumption  of control of Gull and to the transfer of the location of production
specified therein.

        7.     Covenants of Fresenius; Indemnification.

        7.1 Voting of Shares. Subject to the receipt by directors of Gull of the
Fairness  Opinion and  compliance  with the  Hart-Scott-Rodino  Act as stated in
Section 6.3, Fresenius will vote all of the Gull Shares owned by it as stated in
Section 5 in favor of the Merger at the special  meeting of Stockholders of Gull







                                     - 34 -

called to vote upon the Merger.  Fresenius  shall not be  obligated to vote such
shares in favor of the Merger if the Fairness  Opinion is withdrawn  for reasons
other than the appearance of a Third Party Offer.  In addition,  Fresenius shall
not be  obligated  to vote such  shares in favor of the  Merger if the  Fairness
Opinion is withdrawn  because of the  appearance of a Third Party Offer,  but in
such case  Fresenius  will pay to Meridian  the entire  amount of  consideration
received by Fresenius in excess of  $11,094,059  through the  consummation  of a
transaction pursuant to such Third Party Offer.  Fresenius will retain ownership
and all voting rights to the Gull Shares owned by it through the closing.

        7.2  Indebtedness  of Gull to Fresenius.  Upon the closing of the Merger
all amounts then owed by Gull to Fresenius will be reduced by a contribution  by
Fresenius  to the  capital  of  Gull  to the  extent  of any  reductions  in the
shareholders'  equity of Gull that occurs  from  December  31, 1997  through the
Closing Date. Any remaining amounts owed by Gull to Fresenius, including accrued
interest,  will be represented by a note of Meridian payable to Fresenius to the
extent of 50% of the  principal on June 15, 1999 and the balance on December 31,
1999  together in each case with  interest  on the unpaid  balance at 7 1/2% per
annum.  Should  the  reduction  in  shareholders'   equity,   including  without
limitation  reductions  established  through  Section Section 6.11.2 and 6.11.3,
exceed the aforesaid amounts owed by Gull to Fresenius, the balance will be paid
to  Meridian  by  Fresenius  at the  closing  and at the  time of  determination
provided  in Section  Section  6.11.2 and  6.11.3.  Fresenius  will  continue to
finance  Gull through the closing of the Merger in amounts and to the extent and
on terms and conditions  consistent  with Fresenius' past practices in financing
Gull. The amount of any such reduction in the  shareholder's  equity shall be as
determined by the balance sheet prepared as of the Closing Date as called for in
Section 6.10.  Should the parties not agree on the closing  balance  sheet,  any
areas of disagreement  shall be resolved by an accounting firm jointly picked by
the accounting  firms that audited Gull's and Meridian's  last annual  financial
statements.

        7.3  Indemnification for Shareholder  Actions.  Fresenius will indemnify
and hold harmless Meridian and Gull, and their officers,  directors,  employees,
agents and Subsidiaries  from and against any and all claims and demands brought
by Gull Stockholders or Fresenius  shareholders against any of them with respect
to matters arising prior to the Closing Date including,  without limitation, the
matters  contemplated by this Agreement,  other than amounts paid by Meridian or
Gull to dissenting Gull  Stockholders and expenses incurred in related appraisal
proceedings.  The  obligations  of  Fresenius  will be limited  to  $11,094,059.
Meridian  will  indemnify  and hold  harmless  Fresenius  and  Gull,  and  their
officers, directors, employees, agents and Subsidiaries from and against any and
all claims and demands brought by Meridian shareholders against any of them with
respect  to the  matters  contemplated  by  this  Agreement  including,  without
limitation,  with  respect to  information  provided  by Meridian in writing for
inclusion in the proxy statement of Gull for submission to Gull  Stockholders to
vote upon the Merger. The obligations of Meridian will be limited to $3 million.

               7.3.1 Promptly  after receipt by an indemnified  party of written
notice of the  commencement of any action or proceeding  threatened or initiated
with respect to which a claim for indemnification is to be made pursuant to this







                                     - 35 -

Section, the indemnified party will give written notice to the indemnitor of the
commencement  of such  action;  provided  the failure to give  notice  shall not
relieve the indemnitor of its  obligations  hereunder  except to the extent that
the indemnitor is actually prejudiced by such failure to give notice.  Unless in
the indemnified  party's reasonable  judgment a conflict of interest between the
Persons  indemnified  and the indemnitor may exist in respect of the claim,  the
indemnitor  shall be entitled to  participate  and to assume the defense of such
claim,  jointly  with any other such claim to the extent that it may desire with
counsel  reasonably  satisfactory to the  indemnified  party as the case may be.
After notice from the indemnitor of its election to assume the defense  thereof,
the indemnitor  will not be liable to the Persons  indemnified  for any legal or
other  expenses  subsequently  incurred by them in  connection  with the defense
thereof.  The indemnitor  will not consent to the entry of any judgment or enter
into any settlement which does not include as an unconditional term given by the
claimant or plaintiff to the Persons  indemnified,  a release from all liability
with respect to such claim or litigation. The indemnitor shall not be liable for
any settlement of any such claim or action effected without its written consent.

               7.3.2 If the matters giving rise to indemnification  stated above
become  subject to a final judgment of a court of competent  jurisdiction  which
allocates  the relative  liability  for payment of any such claims or demands by
shareholders of Fresenius,  Gull or Meridian, the liability that would otherwise
be that of an indemnitor  shall instead be allocated  among  Fresenius,  Gull or
Meridian.  The  allocation  will be in such  proportions  as is  appropriate  to
reflect the relative  fault of the  particular  parties in  connection  with the
statements or omissions or actions or inactions which resulted in such claims or
damages of third parties, as determined in such final judgment.

        7.4  Indemnification  by Fresenius.  Fresenius shall indemnify  Meridian
with respect to and hold Meridian  harmless from any liability,  cost or expense
which Gull or Meridian may directly or indirectly  incur or suffer by reason of,
or which  results  from,  arises out of or is based upon the  inaccuracy  of any
representation,  warranties  of and  failures to comply with  covenants  made by
Fresenius or Gull herein. Without limiting the generality of the foregoing,  the
indemnity  obligation of Fresenius with respect to the  representations  of Gull
contained in Section 3 shall extend to all  representations  and  warranties  of
Gull as stated in Section 3 and not be limited to those of which  Fresenius  has
actual  Knowledge.  This indemnity  shall also cover any  liabilities,  costs or
expenses  reasonably  incurred which Gull or Meridian may directly or indirectly
incur or suffer by reason  of,  or which  result  from,  or arise out of, or are
based upon a bankruptcy  matter pending in Germany entitled Gull GmbH v. Bamphi,
a notice given Gull by INCSTAR  Corporation  on June 5, 1996 relating to patents
dealing with Epstein Barr Virus and with respect to certain validation questions
described in Section 3.26 of the Disclosure Schedule, in each case to the extent
that such liability,  cost or expense exceeds the amount accrued therefor on the
closing balance sheet called for by Section 6.10.

        The indemnification granted by Fresenius with respect to representations
and  warranties  and failures to comply with  covenants  made by,  Gull,  is not
intended to be a  guarantee  or surety but rather the  direct,  unqualified  and







                                     - 36 -

continuing  obligation of Fresenius in its capacity as a majority shareholder of
Gull  extended  to  Meridian  as an  inducement  for  Meridian to enter into and
perform this Agreement in reliance in part upon the representations,  warranties
and covenants of Gull and in consideration of the  representations and covenants
made by Meridian herein.  The parties  recognize that it would be inequitable if
the obligation of Fresenius, as set forth in this Section 7.4, were construed as
a guarantee or surety so as to limit the ability of Meridian to proceed directly
against Fresenius as provided  hereafter.  Accordingly,  the parties acknowledge
that Meridian may proceed against  Fresenius in accordance with this Section 7.4
as  provided  below,  with  or  without  proceeding  against  Gull or any of its
Subsidiaries.  Fresenius shall not assert or exercise any, and hereby waives and
disclaims all, rights of subrogation, indemnification or contribution by Gull or
Meridian  with respect to any payments  made by it to Meridian  pursuant to this
Section.  Fresenius agrees not to raise as a defense in any proceeding  pursuant
to this Section 7.4 as provided  hereafter  or in any other court or forum,  any
defense to the actions of Meridian based upon a theory that the indemnifications
provided herein by Fresenius are in the nature of a guarantee or surety.

        The  indemnification  obligations  of  Fresenius  under this Section 7.4
shall be limited as follows:  (a) a limit of $11,094,059 for representations and
warranties  concerning  taxation  contained  in  Section  3.30,  (b) a limit  of
$18,036,027  for  material  undisclosed   liabilities  of  which  Fresenius  had
Knowledge,  (c) a limit  of  $11,094,059  received  by  Fresenius  for  material
undisclosed liabilities of which Gull, but not Fresenius, had Knowledge, and (d)
for all other matters covered by this Section 7.4, $3 million.

        7.5  Indemnifications  by Meridian.  Meridian shall indemnify  Fresenius
with respect to and hold Fresenius harmless from any liability,  cost or expense
which Fresenius may directly or indirectly incur,  suffer by reason of, or which
results  from,  arises  out  of or is  based  upon  (i)  the  inaccuracy  of any
representation or warranty or failure to comply with any covenant, other than in
Section 6.12, made by Meridian herein,  (ii) any failure by Gull to pay when due
on or after the Closing Date any  indebtedness  of Gull guaranteed by Fresenius,
(iii) any failure by Meridian to pay when due any  installment of interest on or
principal of the Meridian  Note, and (iv) any failure by Meridian to comply with
its covenant in Section  6.12.  The amount of any such  liability on the part of
Meridian  pursuant  to  clause  (i) of this  Section  7.5  shall be  limited  to
$3,000,000.

        7.6 Zoning  Interruptions.  If the operations of Gull's facility in Salt
Lake County, Utah in the manner presently being conducted are interrupted during
the  twelve  months   following   the  Closing  Date  for  reasons   related  to
non-compliance  with  applicable  zoning laws and  regulations,  Fresenius  will
indemnify Meridian and hold it harmless,  subject to a limit of $4 million, from
all liabilities, costs and expenses including, without limitation, consequential
damages  resulting from  interruption  of production  which Gull or Meridian may
incur as a result of any such interruption  except costs of physical  relocation
of the facility.  All contacts with zoning  authorities  relating to this matter
shall be made by Gull and Fresenius prior to the closing and by Fresenius during
such twelve  month  period  following  the closing  except as may  otherwise  be
authorized by Fresenius in writing.






                                     - 37 -

        7.7 Indemnification  Procedures.  The rights of indemnification provided
in Section  7.4,  Section 7.5 and Section 7.6 shall be subject to the  following
provisions:

               7.7.1 No claim for  indemnification  pursuant  to Section  7.4 or
        clause (i) of Section  7.5 may be made until the  aggregate  of all such
        claims exceeds $500,000.

               7.7.2 The  indemnified  party shall notify the  indemnitor of any
        such liability  specifying the nature of the liability and the amount or
        the estimated amount thereof to the extent then feasible to estimate but
        an  estimate  shall not be  conclusive  of the final  amount of any such
        liability.  The  indemnitor  shall have 10 business days from receipt of
        such  notice  to  notify  the  indemnified  party  whether  or  not  the
        indemnitor  disputes its obligation to indemnify the  indemnified  party
        with  respect  to such  liability.  If such  notice  is not given by the
        indemnitor, the indemnitor shall pay the amount claimed promptly.

               7.7.3 Nothing shall prevent the  indemnified  party from making a
        claim with respect to a potential or contingent  liability  provided the
        indemnified  party's  notice  sets forth a  specific  basis for any such
        potential or contingent  liability and the estimated  amount  thereto to
        the  extent  then  feasible  and the  indemnified  party has  reasonable
        grounds to believe that such a liability or impairment  will be incurred
        or  suffered.  Any payment to an  indemnified  party with respect to any
        such potential or contingent  liability  shall be final and binding upon
        the indemnified  party,  regardless of the actual losses incurred by the
        indemnified party in respect of such liability when actually asserted or
        incurred.

               7.7.4 The indemnified  party and the indemnitor  shall attempt in
        good faith to  resolve  any  dispute  between  them with  respect to the
        matters  covered  by  this  Section  promptly  by  negotiations  between
        executives  that have the authority to settle the dispute.  Either party
        may give the other  written  notice of any dispute  not  resolved in the
        normal course.  Within 10 business days  following  delivery of any such
        notice,  executives of both parties shall meet at a mutually  acceptable
        time and place thereafter for as long as they deem necessary to exchange
        relevant  information  and to  attempt to resolve  the  dispute.  If the
        matter has not been resolved within 20 business days following  delivery
        of such notice or if the parties  fail to meet within 10 business  days,
        either party may initiate mediation of the dispute. Mediation shall take
        place under the then current  model  procedure for mediation of business
        disputes at the American  Arbitration  Association,  140 W. 51st Street,
        New York,  New York 10020.  A neutral  third party will be selected from
        the Association's panel. The place of mediation shall be New York City.

               Any dispute not  resolved by  mediation  within 45 days after the
        initiation  shall be settled by arbitration  conducted  expeditiously in
        accordance with the rules for arbitration of business disputes conducted
        by the American  Arbitration  Association by a sole  arbitrator.  If one
        party  has  requested  to the  other to  participate  in the  procedures
        






                                            - 38 -

        outlined  above  and  the  other has  failed,  the  other  may  initiate
        arbitration before expiration of the 45 day period. Arbitration shall be
        governed by the United States  Arbitration  Act  and  judgment  upon the
        award rendered  by  the  arbitrator  may  be entered by any court having
        jurisdiction.

        7.8  Transition.  Fresenius  will not take any action to discourage  any
lessor, licensor, customer, supplier, or other business associate of any of Gull
and its Subsidiaries from maintaining the same business  relationships with Gull
and its Subsidiaries  after the Closing Date as it maintained with them prior to
the Closing Date.  Fresenius will refer all customer  inquiries  relating to the
businesses of Gull and its  Subsidiaries  to Meridian from and after the Closing
Date.  Fresenius  will perform in all material  respects all  agreements  now in
force between it and Gull or any of its Subsidiaries until and after the Closing
Date in  accordance  with  the  terms  of any such  agreements.  Fresenius  will
transmit  to  Meridian  any  adverse  reaction,  adverse  experience  or quality
complaints  pertaining to the Products coming to Fresenius'  attention after the
Closing addressed to Meridian at the address set forth hereafter.

        7.9  Confidentiality.  Fresenius  will treat and hold as such all of the
Confidential Information, refrain from using any of the Confidential Information
except in connection  with this Agreement,  and deliver  promptly to Meridian or
destroy,  at  the  request  of  Meridian,   all  tangible   embodiments  of  the
Confidential Information which are in its possession.  If Fresenius is requested
or required to disclose  any  Confidential  Information,  Fresenius  will notify
Meridian  promptly at the request or  requirement  so that  Meridian may seek an
appropriate  protective  order or waive  compliance  with the provisions of this
Section.  If, in the  absence of a  protective  order or the receipt of a waiver
hereunder,  Fresenius  is, on the advice of counsel,  compelled  to disclose any
Confidential   Information   to  any   tribunal,   Fresenius  may  disclose  the
Confidential  Information;  provided,  however,  that  Fresenius  shall  use its
reasonable efforts to obtain, at the reasonable request of Meridian, an order or
other assurance that confidential  treatment will be accorded to such portion of
the  Confidential  Information  required  to  be  disclosed  as  Meridian  shall
designate.  The  foregoing  provisions  shall  not  apply  to  any  Confidential
Information which is generally  available to the public immediately prior to the
time of disclosure.

        7.10  Noncompetition  and  Non-Solicitation  Covenants.  For a period of
three years after the Closing Date,  Fresenius  will not initiate a new business
venture  or  acquire  any  business  which  is  predominantly   engaged  in  the
manufacture  and sale of diagnostic  testing kits and reagents in the same field
of application as existing Gull or Meridian products (hereinafter referred to as
"Prohibited Business") in any geographic area in which Gull and its Subsidiaries
or Meridian and its Subsidiaries  conducts that business as of the Closing Date,
or solicit  directly or indirectly  or encourage any person  employed by Gull or
any  Subsidiary  or  Meridian  to leave such  employment  when Gull or  Meridian
desires to retain that employee.  However,  notwithstanding the foregoing,  this
Section 7.10 shall not prevent or prohibit Fresenius from any of the following:








                                     - 39 -


               (i)    acquiring  another  business  that  is  not  predominantly
                      engaged in the Prohibited Business; and

               (ii)   distributing  any products which are or may be competitive
                      with products manufactured or sold by Gull or Meridian.

If Fresenius acquires another business pursuant to subsection (i) above which is
also engaged in the Prohibited Business, Fresenius shall use its best efforts to
notify Meridian of such  acquisition and to enter into discussions with Meridian
regarding possible business arrangements with respect thereto acceptable to both
Fresenius and Meridian.

        If the final judgment of a court of competent jurisdiction declares that
any term or provision of this Section is invalid or  unenforceable,  the Parties
agree that the court making the determination of invalidity or  unenforceability
shall  have the  power to  reduce  the  scope,  duration  or area of the term or
provision,  to delete  specific  words or phrases,  or to replace any invalid or
unenforceable  term or  provision  with a term or  provision  that is valid  and
enforceable and that comes closest to expressing the intention of the invalid or
unenforceable  term or provision,  and this Agreement shall be enforceable as so
modified  after the  expiration  of the time within  which the  judgment  may be
appealed.

        7.11 Contribution to Capital.  Fresenius shall release its invoice dated
June 30,  1998 in an amount of  856,281.18  German  Marks  evidencing  its claim
against Gull for the  reimbursement  of certain  costs and expenses  incurred by
Fresenius on behalf of Gull by  contributing  such  obligation to the capital of
Gull prior to the closing.

        8.     Conditions to Obligations to Close.

        8.1  Conditions  to Each Party's  Obligation  to Effect the Merger.  The
respective obligation of each Party to effect the Merger shall be subject to the
satisfaction of the following conditions:

               8.1.1 The approval of Gull's  Stockholders and of the Supervisory
        Board of Fresenius shall have been obtained;

               8.1.2 The waiting period  applicable to the  consummation  of the
        Merger  under the  Hart-Scott-Rodino  Act  shall  have  expired  or been
        terminated  and no  objections  to the Merger  shall have been raised in
        connection with such filing;

               8.1.3 No statute,  rule,  regulation,  executive  order,  decree,
        temporary  restraining  order,  preliminary  or permanent  injunction or
        other  order  issued by any  court of  competent  jurisdiction  or other
        governmental  entity or other legal restraint or prohibition  preventing
        the  consummation of the Merger shall be in effect;  provided,  however,
        that each of the Parties shall have used  reasonable  efforts to prevent
        the  entry of any  such  injunction  or other  order  and to  appeal  as
        promptly as possible any injunction or other order that may be entered;






                                     - 40 -

        

               8.1.4 There  shall not have been  instituted  or be  pending,  or
        threatened,  any suit, action or proceeding by any Person or entity as a
        result of this Agreement or any of the transactions  contemplated hereby
        which,  if such Person or entity were to prevail,  would  reasonably  be
        expected  to prevent the  consummation  of the Merger or have a material
        adverse  effect on the  business,  financial  condition  or  results  of
        operations of Gull and its Subsidiaries, taken as a whole; and

               8.1.5  Gull  shall  have  received  a letter  from its  financial
        advisor, dated the Closing Date, stating that the Fairness Opinion is in
        full force and effect.

        8.2 Conditions to Obligation of Meridian and the Transitory  Subsidiary.
The obligation of each of Meridian and the  Transitory  Subsidiary to consummate
the Merger is subject to satisfaction of the following conditions:

               8.2.1 Gull and its  Subsidiaries  shall have  procured all of the
        third party consents specified on the date of this Agreement pursuant to
        Section 6.2;

               8.2.2 The  representations  and  warranties  set forth in Section
        Section 3 and 5 shall be true and  correct in all  material  respects at
        and as of the  Closing  Date  other  than to the  extent  that  any such
        representation  and  warranty is, by its terms,  expressly  limited to a
        specific date, in which case such  representation  and warranty shall be
        true and  correct  as of such  date and Gull and  Fresenius  shall  each
        represent and warrant to Meridian and the Transitory Subsidiary that the
        statements  contained in Section Section 3 and 5,  respectively,  and in
        the accompanying  Disclosure Schedule are correct and complete as of the
        Closing  Date and as though the Closing  Date were  substituted  for the
        date of this Agreement throughout those sections;

               8.2.3 Gull and Fresenius  shall each have  performed and complied
        with all of its covenants hereunder required to be performed or complied
        with on or prior to the Closing Date in all material respects;

               8.2.4 Since the date of this Agreement, there shall not have been
        or occurred  any  material  adverse  change in the  business,  financial
        condition,  cash  flows,  results of  operations  or  prospects  for the
        manufacture and sale of Products and products in development of Gull and
        its  Subsidiaries,  taken as a whole,  other than  changes  relating  to
        Gull's industry or the economy in general and not  specifically  related
        to Gull and its  Subsidiaries and other than reductions in shareholders'
        equity contemplated by Section 7.2;

               8.2.5 Gull shall have  delivered to Meridian a certificate to the
        effect  that  each  of  the  conditions  specified  in  Section  Section
        8.2.1-8.2.4 is satisfied in all respects;






                                     - 41 -

               8.2.6  Meridian  shall  have  received  from  counsel to Gull and
        Fresenius  opinions in form and substance  substantially as set forth in
        Exhibits  B and  C  attached  hereto,  addressed  to  Meridian  and  the
        Transitory Subsidiary, and dated as of the Closing Date;

               8.2.7 Meridian shall have received the resignations, effective as
        of the  closing,  of each  director  and officer of Gull and each of its
        Subsidiaries;

               8.2.8 All outstanding  options to purchase Gull Shares shall have
        been canceled on terms  satisfactory  to Meridian and all shares of Gull
        Deutschland  GmbH and Gull  Europe S.A.  owned by Michael  Malan or John
        Turner shall have been acquired by Meridian or Gull;

               8.2.9 Gull and Fresenius shall have furnished to Meridian and the
        Transitory  Subsidiary such other customary  documents,  certificates or
        instruments as Meridian may reasonably request evidencing  compliance by
        Gull with the terms of this Agreement;

               8.2.10  Meridian  shall have entered into  employment  agreements
        with Dr. Fred Rachford and John Turner  providing  for their  employment
        for a  term  of  at  least  two  years  after  the  closing,  containing
        confidentiality  and  two  year  noncompetition   provisions   following
        termination of employment and otherwise on terms reasonably satisfactory
        to Meridian.  Meridian  shall have  entered into a consulting  agreement
        with  Holly  Scribner  providing  for a term of at  least  two  years of
        consultation after the closing,  containing confidentiality and two-year
        noncompetition   provisions  following  termination  of  the  consulting
        relationship and otherwise on terms reasonably satisfactory to Meridian;

               8.2.11  Meridian and Fresenius shall have entered into a mutually
        satisfactory  agreement  for  the  continued  manufacture  for  Gull  or
        Meridian  of  the  blood  group  and  HLA   Products   currently   being
        manufactured in Fresenius'  facility and with such agreement expiring no
        more than two years after the Closing Date;

               8.2.12 The due diligence of Meridian  contemplated in Section 6.6
        shall have been  completed and not have revealed  anything of a material
        adverse nature as to the assets, liabilities, businesses, operations and
        financial condition of Gull which is not the subject of a representation
        or warranty contained herein; and

               8.2.13  Meridian  shall have obtained the written  consent of the
        College of  American  Pathologists  for the  assumption  by  Meridian of
        control of Gull and to the  transfer of the  location of the  production
        called for in an  agreement  dated  January 1, 1998 between Gull and the
        College of  American  Pathologists  from  Gull's  facility  in Salt Lake
        County, Utah to Meridian's facility in Cincinnati, Ohio.

               Meridian  may  waive any  condition  specified  in a  writing  so
        stating at or prior to the closing.






                                     - 42 -

        8.3 Conditions to Obligation of Gull and Fresenius.  The  obligations of
Gull and Fresenius to consummate the Merger are subject to  satisfaction  of the
following conditions:

               8.3.1 The  representations  and warranties set forth in Section 4
        shall be true and  correct in all  material  respects,  at and as of the
        Closing Date other than to the extent that any such  representation  and
        warranty  is, by its terms,  expressly  limited to a specific  date,  in
        which case such representation and warranty shall be true and correct as
        of such  date and  Meridian  shall  represent  and  warrant  to Gull and
        Fresenius  that the  statements  contained  in Section 4 are correct and
        complete  as of the  Closing  Date and as though the  Closing  Date were
        substituted for the date of this Agreement throughout those sections;

               8.3.2 Each of Meridian and the Transitory  Subsidiary  shall have
        performed and complied with all of its covenants  hereunder  required to
        be  performed  or complied  with on or prior to the Closing  Date in all
        material respects through the closing;

               8.3.3 Each of Meridian and the Transitory  Subsidiary  shall have
        delivered  to  Gull  a  certificate  to  the  effect  that  each  of the
        conditions specified in Section 8.3 is satisfied in all respects;

               8.3.4  The Fairness Opinion shall not have been withdrawn;

               8.3.5 Gull and  Fresenius  shall have  received  from  counsel to
        Meridian and the Transitory  Subsidiary an opinion in form and substance
        substantially  as set forth in Exhibit D attached  hereto,  addressed to
        each of them; and

               8.3.6 Meridian and the Transitory Subsidiary shall have furnished
        to Gull such other customary  documents,  certificates or instruments as
        Gull may reasonably  request  evidencing  compliance by Meridian and the
        Transitory Subsidiary with the terms of this Agreement.

               Gull and Fresenius may waive any condition specified in a writing
        so stating at or prior to the closing.

        9.     Termination.

        9.1  Termination  of Agreement.  This Agreement may be terminated at any
time prior to the Effective Time by:

               9.1.1  The Parties by mutual written consent;

               9.1.2  Meridian and the  Transitory  Subsidiary by giving written
        notice to Gull and  Fresenius  if the  conditions  set forth in  Section
        8.2.12  have not  been met or if  Fresenius  or Gull  has  breached  any
        material  representation,  warranty,  or  covenant  contained  in   this






                                     - 43 -

        Agreement  in  any   material  respect,  Meridian  or  the    Transitory
        Subsidiary has notified Fresenius or Gull of the breach, and the  breach
        has continued  without cure for a period of 30 days after the notice  of
        breach or if  the  closing shall not have occurred on or before December
        1, 1998,  unless the failure to close  results from the failure  of Gull
        or Fresenius to satisfy  conditions set forth in Section Section   8.2.2
        and 8.2.3;

               9.1.3  Gull  by  giving   written  notice  to  Meridian  and  the
        Transitory  Subsidiary  if Meridian  or the  Transitory  Subsidiary  has
        breached any material representation, warranty, or covenant contained in
        this Agreement in any material  respect,  Gull has notified Meridian and
        the  Transitory  Subsidiary of the breach,  and the breach has continued
        without  cure for a period of 30 days  after the  notice of breach or if
        the  closing  shall not have  occurred  on or before  December  1, 1998,
        unless the  failure to close  results  from the  failure of  Meridian to
        satisfy the conditions set forth in Section Section 8.3.1 and 8.3.2;

               9.1.4 Gull, if  notwithstanding  Gull's  compliance  with Section
        6.8,  Gull  receives and accepts prior to the Closing Date a Third Party
        Offer;  provided,  however,  that, in the event of such  acceptance of a
        Third Party Offer Gull shall  immediately  pay to Meridian as called for
        in Section 6.8, the sum of $350,000 as  liquidated  damages and not as a
        penalty,  any such payment to be made in  immediately  available  United
        States funds;

               9.1.5 Gull or Meridian  notwithstanding  Gull's  compliance  with
        Section  6.8, if Gull's  Board of  Directors  prior to the Closing  Date
        withdraws its  recommendation to Gull Stockholders of this Agreement and
        the Merger; provided, however, that in the event of such withdrawal Gull
        shall immediately pay to Meridian its out-of-pocket expenses incurred in
        relation to the transaction.  In addition, if within twelve months after
        such  termination,  Gull shall consummate a Third Party Offer,  Gull and
        Fresenius  shall be jointly and severally  obligated to pay Meridian the
        additional sum of $350,000,  as liquidated damages and not as a penalty,
        any such payment to be made  promptly in  immediately  available  United
        States funds;

               9.1.6 Any Party by giving  written notice to the other Parties if
        this  Agreement  and the Merger fail to receive  the  approval of Gull's
        Stockholders or if any  governmental  entity shall have issued an order,
        decree  or  ruling or taken  any  other  action  permanently  enjoining,
        restraining or otherwise  prohibiting the consummation of the Merger and
        such order, decree or ruling or other action shall have become final and
        nonappealable; or

               9.1.7 Meridian,  if Fresenius'  Supervisory  Board shall not have
        duly approved the actions of its officer executing this Agreement.

        9.2  Effect of  Termination.  If any  Party  terminates  this  Agreement
pursuant to Section 9.1,  all rights and  obligations  of the Parties  hereunder







                                     - 44 -

shall terminate without any liability of any Party to any other Party except for
any  liability  of any Party  then in breach  or as set  forth in  Section  9.1;
subject to Section Section 3.8, 4.4, 5.3 and 7.9, the confidentiality provisions
contained in Section  6.6,  this Section 9.2 and Section 10, each of which shall
survive any such termination.

        10.    Miscellaneous.

        10.1  Survival.  The  representations,  warranties  and covenants of the
Parties  will  survive  the  closing  of the  Merger  for a  period  of one year
following the delivery to Meridian of audited financial  statements for Meridian
and Gull covering the year ended  September 30, 1998,  but such date of delivery
shall be deemed to be no later than December 30, 1998. This time period shall be
one year following the delivery of audited  financial  statements  from Meridian
and Gull  covering the year ended  September  30, 1999 but such date of delivery
shall be deemed to be no later  than  December  30,  1999  with  respect  to the
matters  covered by the  following  sections  of this  Agreement:  Section 3.5 -
"Filings with the SEC," Section 3.7 - "Undisclosed  Liabilities," Section 3.10 -
"Litigation,"   Section  3.11  -  "Product   Warranty,"  Section  3.12  "Product
Liability,"  Section 3.14 - "Employee  Benefits,"  Section 3.27 - "Contracts and
Agreements,"  Section 3.28 - "Licenses and  Permits,"  Section 3.30 - "Taxes and
Tax Returns," Section 6.8 - "Exclusivity,"  Section 7.3 -  "Indemnification  for
Shareholder Actions," and except that the period of survival shall be five years
after the  Closing  Date for Section  6.9 - "Bylaw  Indemnification,"  and three
years after the Closing  Date for Section  7.10 - "Covenant  Not to Compete" and
twelve months after a termination for the matters contemplated by Section 9.1.5.
Section 7.4,  Section 7.5 and Section 7.6 shall  survive  subject to the various
periods of  limitations  set forth above.  Any claim  brought under Section 7.4,
Section 7.5 and Section 7.6 shall be presented  within 60 days after  expiration
of the relevant period of survival with respect to each such claim.

        10.2 Press Releases and Public  Announcements.  No Party shall issue any
press release or make any public announcement  relating to the subject matter of
this  Agreement  without  the  prior  written  approval  of the  other  Parties;
provided,  however, that any Party may make any public disclosure it believes in
good faith is required by applicable law or by any listing or trading  agreement
concerning its  publicly-traded  securities in which case the  disclosing  Party
will use its  reasonable  best efforts to advise the other Party prior to making
the disclosure.

        10.3 No  Obligations  Upon  Fresenius  Medical  Care AG. It is expressly
understood among the parties to this Agreement that no representation, warranty,
covenant or any other provision contained in this Agreement shall apply to or be
binding upon Fresenius Medical Care AG or any of its Subsidiaries.

        10.4 No Third Party  Beneficiaries.  This Agreement shall not confer any
rights or remedies  upon any Person other than the Parties and their  respective
successors  and permitted  assigns;  provided,  however,  that the provisions in
Section 2 concerning  payment of the Merger  consideration  are intended for the







                                     - 45 -

benefit of, and shall be enforceable by Gull Stockholders, their heirs and their
respective legal  representatives and the provisions in Section 6.9 are intended
for the  benefit  of,  and shall be  enforceable  by the  individuals  specified
therein and their heirs and their respective legal  representatives and shall be
binding on  Meridian,  the  Transitory  Subsidiary  and Gull,  their  respective
Subsidiaries and their respective successors and assigns.

        10.5 Entire Agreement.  This Agreement  including the documents referred
to herein  constitutes the entire agreement among the parties and supersedes any
prior or  contemporaneous  understandings,  agreements or  representations by or
among the parties, written or oral, to the extent they related in any way to the
subject matter hereof.

        10.6 Successors and Assignment. This Agreement shall be binding upon and
inure to the benefit of the Parties named herein and their respective successors
and permitted  assigns.  No Party may assign either this Agreement or any of its
rights,  interests,  or obligations hereunder without the prior written approval
of the other  Parties  provided,  however,  that  Meridian may assign its rights
hereunder to an affiliated  entity without the prior written consent of Gull and
Fresenius  provided  Meridian executes a written guarantee of the obligations of
any such assignee in a form reasonably acceptable to Gull and Fresenius.

        10.7 Counterparts.  This Agreement may be executed in counterparts, each
of which shall be deemed an original but all of which together shall  constitute
one and the same instrument.

        10.8  Headings.  The section  headings  contained in this  Agreement are
inserted  for  convenience  only and shall not affect in any way the  meaning or
interpretation of this Agreement.

        10.9  Notices.  All  notices,   requests,   demands,  claims  and  other
communications  hereunder will be in writing. Any notice, request, demand, claim
or other communication hereunder shall be addressed to the intended recipient as
set forth:

               If to Gull:       GULL LABORATORIES, INC.
                                 1011 East Murray Holladay Road
                                 Salt Lake City, Utah  84117
                                 Attention: Silke Humberg Ph.D.
                                 Fax: 801-269-8251

               With a required   PRINCE, YEATES & GELDZAHLER
               copy to:          City Centre I, Suite 900
                                 175 East 400 South
                                 Salt Lake City, Utah   84111
                                 Attention: Gregory E. Lindley, Esq.
                                 Fax:  801-524-1099







                                            - 46 -

               If to Fresenius   FRESENIUS AG
                                 Else-Kroner Str. 1
                                 61346 Bad Homburg, Germany
                                 Attention:  Rainer Baule
                                 Fax:  011-49-6172-608-2386

               With a required   O'MELVENY & MYERS LLP
               copy to:          Citicorp Center
                                 153 East 53rd Street
                                 New York, New York 10022-4461
                                 Attention:  Robert A. Grauman, Esq.
                                 Fax:  212-326-2061

               If to Meridian    MERIDIAN DIAGNOSTICS, INC.
               or the Transitory 3471 River Hills Drive
               Subsidiary:       Cincinnati, Ohio  45244
                                 Attention: Mr. John A. Kraeutler
                                 Fax: 513-271-3762

               Copy to:          KEATING, MUETHING & KLEKAMP
                                 1800 Provident Tower
                                 One East Fourth Street
                                 Cincinnati, Ohio  45202
                                 Attention:  Gary P. Kreider, Esq.
                                 Fax:  513-579-6956

        Any  Party  may  send  any  notice,  request,  demand,  claim,  or other
communication hereunder to the intended recipient at the address set forth above
by any  commercially  reasonable  means,  but no such notice,  request,  demand,
claim, or other communication shall be deemed to have been duly given unless and
until it actually is received by the  intended  recipient.  Any Party may change
the  address  to  which   notices,   requests,   demands,   claims,   and  other
communications  hereunder are to be delivered by giving the other Parties notice
in the manner provided herein.

        10.10  Governing Law. This Agreement  shall be governed by and construed
in accordance with the internal  substantive  laws of Ohio without giving effect
to any choice or conflict of law provision or rule, whether of Ohio or any other
jurisdiction,  that would cause or result in the  application of the laws of any
jurisdiction other than Ohio.

        10.11  Amendments  and  Waivers.  The  Parties  may  mutually  amend any
provision  of this  Agreement at any time prior to the  Effective  Time with the
prior authorization of their respective Boards of Directors;  provided, however,
that any amendment  effected after  obtaining the approval of Gull  Stockholders







                                     - 47 -

will be subject  to the  restrictions  contained  in the Utah  Revised  Business
Corporation Act. Any decrease in the Merger  consideration  per Gull Share shall
be submitted to Gull's Stockholders for approval.  No amendment of any provision
of this  Agreement  shall be valid  unless it is in writing and signed by all of
the Parties. No waiver by any Party of any default,  misrepresentation or breach
of warranty or covenant  hereunder,  whether intentional or not, shall be deemed
to extend to any prior or  subsequent  default,  misrepresentation  or breach of
warranty or covenant hereunder or affect in any way any rights arising by virtue
of any prior or subsequent such occurrence.

        10.12  Severability.  Any term or  provision of this  Agreement  that is
invalid or unenforceable  in any situation in any jurisdiction  shall not affect
the validity or  enforceability  of the remaining terms and provisions hereof or
the validity or  enforceability  of the offending term or provision in any other
situation or in any other jurisdiction.

        10.13 Expenses. Each of the Parties will bear its own costs and expenses
including legal fees and expenses incurred in connection with this Agreement and
the transactions  contemplated hereby.  Meridian shall pay filing fees under the
Hart-Scott-Rodino Act.

        10.14  Construction.  The  Parties  have  participated  jointly  in  the
negotiation  and  drafting  of this  Agreement.  In the  event an  ambiguity  or
question of intent or interpretation  arises,  this Agreement shall be construed
as if drafted jointly by the Parties and no presumption or burden of proof shall
arise  favoring or  disfavoring  any Party by virtue of the authorship of any of
the provisions of this Agreement. Any reference to any federal, state, local, or
foreign  statute  or law  shall  be  deemed  also  to  refer  to all  rules  and
regulations promulgated  thereunder,  unless the context otherwise requires. The
word "including" shall mean including without limitation.

        10.15  Incorporation  of  Exhibits  and  Schedules.   The  Exhibits  and
Schedules   identified  in  this  Agreement  and  the  Disclosure  Schedule  are
incorporated herein by reference and made a part hereof.

        10.16  Jurisdiction.  All within the  meaning of Section  2307.39 of the
Ohio Revised  Code,  any lawsuit to enforce or interpret  this  Agreement can be
brought and  maintained  only in the Court of Common  Pleas of Hamilton  County,
Ohio or the U.S. District Court for the Southern District of Ohio at Cincinnati,
and the substantive law of the State of Ohio will govern and control every issue
or dispute relating to the interpretation or enforcement of this Agreement.

                                          * * * * *







                                     - 48 -


        IN WITNESS  WHEREOF,  the  Parties  hereto  have  executed  this  Merger
Agreement on September 15, 1998.

                                             GULL LABORATORIES, INC.



                                             By:   /s/Silke Humberg
                                                _______________________________
                                                Name:  Silke Humberg
                                                Title: CEO & President

                                             MERIDIAN DIAGNOSTICS, INC.



                                            By:  /s/John A. Kraeutler
                                               _________________________________
                                               Name:  John A. Kraeutler
                                               Title: President

                                            FRESENIUS AG



                                            By:  /s/Rainer Baule
                                               _________________________________
                                               Name:  Ranier Baule
                                               Title: COO, President, 
                                                      I & H Division



                                            By:  /s/M. Schmidt
                                               _________________________________
                                               Name:  M. Schmidt
                                               Title: President, Pharma Division

                                            MERIDIAN ACQUISITION CO.


                                            By:  /s/John A. Kraeutler
                                               _________________________________
                                               Name:  John A. Kraeutler
                                               Title: President