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                                                                    EXHIBIT 10.2



                              PROMISSORY NOTE NO. 1


                                                        Date: September 30, 1997


               FOR VALUE RECEIVED, the undersigned promises to pay to the order
of Transamerica Business Credit Corporation or its assigns (the "Payee") at its
office located at Riverway II, West Office Tower, 9399 West Higgins Road,
Rosemont, Illinois 60018, or at such other place as the Payee or the holder
hereof may designate in writing, the principal amount of One Million Five
Hundred Thousand Dollars ($1,500,000.00) received by the undersigned, plus
interest, in lawful money of the United States and in immediately available
funds. This Note shall be payable commencing with a first installment of
Seventy-Six Thousand Seven Hundred Ninety-Five and 95/100 Dollars ($76,795.95)
payable on the date hereof and thereafter in 46 consecutive equal monthly
installments of Thirty-Seven Thousand Seven Hundred Sixty-Eight and 50/100
Dollars ($37,768.50) commencing November 1, 1997 and a final installment payable
on September 30, 2001 of Two Hundred Twenty-Five Thousand Dollars ($225,000.00)
together with the unpaid balance of the Note, if any. No amount of principal
paid or prepaid hereunder may be reborrowed.

               This Note is issued pursuant to an Equipment Loan and Security
Agreement dated as of September 26, 1997 (as amended, supplemented or otherwise
modified from time to time, the "Agreement"), between the undersigned and the
Payee and is subject and entitled to all provisions and benefits thereof.
Capitalized terms used but not defined herein shall have the meanings set forth
in the Agreement.

               If any installment of this Note is not paid within five days
after its due date, the undersigned agrees to pay on demand, in addition to the
amount of such installment, an amount equal to 5% of such installment, but only
to the extent permitted by Applicable Law.

               The undersigned shall have the right to prepay this Note at any
time on or after January 1, 1999, on thirty days' prior written notice to the
Payee. On the date of any such prepayment, the undersigned shall pay an amount
equal to the present value of the remaining payments (principal and interest)
due hereunder discounted at 6% simple interest per annum, together with all fees
and other amounts payable on the amount so prepaid or in connection therewith to
the date of such prepayment. Any prepayments shall be applied to the
installments hereof in the inverse order of maturity.

               Upon the maturity of this Note or the acceleration of the
maturity of this Note in accordance with the terms of the Agreement, the entire
unpaid principal amount on this Note, together with all interest, fees and other
amounts payable hereon or in connection herewith, shall be immediately due and
payable without further notice or demand, with interest on all such amounts at a
rate not to exceed the lawful limit, from the date of such maturity or
acceleration, as the case may be, until all such amounts have been paid.

               If any payment on this Note becomes payable on a day other than a
Business Day, the maturity thereof shall be extended to the next succeeding
Business Day.

               The undersigned hereby waives diligence, demand, presentment,
protest and notice of any kind, and assents to extensions of the time of
payment, release, surrender or substitution of security, or forbearance or




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other indulgence, without notice. The undersigned agrees to pay all amounts
under this Note without offset, deduction, claim, counterclaim, defense or
recoupment, all of which are hereby waived.

               The Payee, the undersigned and any other parties to the Loan
Documents intend to contract in strict compliance with applicable usury law from
time to time in effect. In furtherance thereof such Persons stipulate and agree
that none of the terms and provisions contained in the Loan Documents shall ever
be construed to create a contract to pay, for the use, forbearance or detention
of money, interest in excess of the maximum amount of interest permitted to be
charged by Applicable Law from time to time in effect. Neither the undersigned
nor any present or future guarantors, endorsers, or other Persons hereafter
becoming liable for payment of any Obligation shall ever be liable for unearned
interest thereon or shall ever be required to pay interest thereon in excess of
the maximum amount that may be lawfully charged under Applicable Law from time
to time in effect, and the provisions of this paragraph shall control over all
other provisions of the Loan Documents which may be in conflict or apparent
conflict herewith. The Payee expressly disavows any intention to charge or
collect excessive unearned interest or finance charges in the event the maturity
of any Obligation is accelerated. If (a) the maturity of any Obligation is
accelerated for any reason, (b) any Obligation is prepaid and as a result any
amounts held to constitute interest are determined to be in excess of the legal
maximum, or (c) the Payee or any other holder of any or all of the Obligations
shall otherwise collect amounts which are determined to constitute interest
which would otherwise increase the interest on any or all of the Obligations to
an amount in excess of that permitted to be charged by Applicable Law then in
effect, then all sums determined to constitute interest in excess of such legal
limit shall, without penalty, be promptly applied to reduce the then outstanding
principal of the related Obligations or, at the Payee's or such holder's option,
promptly returned to the undersigned upon such determination. In determining
whether or not the interest paid or payable, under any specific circumstance,
exceeds the maximum amount permitted under Applicable Law, the Payee and the
undersigned (and any other payors thereof) shall to the greatest extent
permitted under Applicable Law, (i) characterize any non-principal payment as an
expense, fee or premium rather than as interest, (ii) exclude voluntary
prepayments and the effects thereof, and (iii) amortize, prorate, allocate, and
spread the total amount of interest through the entire contemplated term of this
Note in accordance with the amount outstanding from time to time thereunder and
the maximum legal rate of interest from time to time in effect under Applicable
Law in order to lawfully charge the maximum amount of interest permitted under
Applicable Law.

               This Note may not be changed, modified or terminated orally, but
only by an agreement in writing signed by the undersigned and the Payee or any
holder hereof.

               The undersigned shall, upon demand, pay to the Payee all costs
and expenses incurred by the Payee (including the reasonable fees and
disbursements of counsel and other professionals) in connection with the
preparation, execution and delivery of this Note and all other Loan Documents,
and in connection with the administration, modification and amendment of the
Loan Documents, and pay to the Payee all costs and expenses (including the fees
and disbursements of counsel and other professionals) paid or incurred by the
Payee in (A) enforcing or defending its rights under or in respect of this Note
or any of the other Loan Documents, (B) collecting any of the liabilities by the
undersigned to the Payee or otherwise administering the Loan Documents, (C)
foreclosing or otherwise collecting upon any collateral and (D) obtaining any
legal, accounting or other advice in connection with any of the foregoing.

               This Note shall be binding upon the successors and assigns of the
undersigned and inure to the benefit of the Payee and its successors, endorsees
and assigns. If any term or provision of this Note shall be held invalid,
illegal or unenforceable, the validity of all other terms and provisions hereof
shall in no way be affected thereby.




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               EACH OF THE UNDERSIGNED AND, BY ITS ACCEPTANCE HEREOF, THE PAYEE
HEREBY KNOWINGLY, VOLUNTARILY AND INTENTIONALLY WAIVES (TO THE FULLEST EXTENT
PERMITTED BY APPLICABLE LAW) ANY RIGHT IT MAY HAVE TO A TRIAL BY JURY OF ANY
DISPUTE ARISING UNDER OR RELATING TO THIS NOTE AND AGREES THAT ANY SUCH DISPUTE
SHALL BE TRIED BEFORE A JUDGE SITTING WITHOUT A JURY.

               THIS NOTE SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH
THE LAWS OF THE STATE OF ILLINOIS WITHOUT GIVING EFFECT TO PRINCIPLES OF
CONFLICTS OF LAW.




                                       ACCUMED INTERNATIONAL, INC.


                                       By:   /s/ PETER P. GOMBRICH
                                           -------------------------------------
                                           Name:   Peter P. Gombrich
                                           Title:   Chief Executive Officer









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