Exhibit 3.142


                          CERTIFICATE OF INCORPORATION
                                       OF
                   SEMINOLE COUNTY AMBULANCE ACQUISITION, INC.

                                    ARTICLE I

                               NAME OF CORPORATION

                         The name of this corporation is

                   Seminole County Ambulance Acquisition, Inc.

                                   ARTICLE II

                                REGISTERED OFFICE

     The address of the  registered  office of the  corporation  in the state of
Delaware is 32 Loockerman Square,  Suite L-100, in the City of Dover,  County of
Kent, and the name of its registered agent at that address is The  Prentice-Hall
Corporation System, Inc.

                                  ARTICLE III

                                    PURPOSE

     The purpose of the  corporation  is to engage in any lawful act or activity
for which  corporations  may be organized  under the General  Corporation Law of
Delaware.

                                   ARTICLE IV

                            AUTHORIZED CAPITAL STOCK

     The  corporation  shall be  authorized  to issue  one  class of stock to be
designated  Common Stock; the total number of shares which the corporation shall
have authority to issue is one thousand (1,000),  and each such share shall have
a par value of one cent ($.01).

                                    ARTICLE V

                                  INCORPORATOR

     The name and mailing address of the incorporator of the corporation is:

                               Gerard A. Thompson
                      620 Newport Central Drive, Suite 1450
                         Newport Beach, California 92660



                                   ARTICLE VI
                          BOARD POWER REGARDING BYLAWS

     In  furtherance  and not in limitation of the powers  conferred by statute,
the board of directors is expressly authorized to make, repeal, alter, amend and
rescind the bylaws of the corporation.

                                   ARTICLE VII

                              ELECTION OF DIRECTORS

     Elections of directors  need not be by written  ballot unless the bylaws of
the corporation shall so provide.

                                  ARTICLE VIII

                        LIMITATION OF DIRECTOR LIABILITY

     To the fullest extent permitted by the Delaware General  Corporation Law as
the same exists or may hereafter be amended, a director of the corporation shall
not be liable to the corporation or its  stockholders  for monetary  damages for
breach of fiduciary duty as a director.  If the Delaware General Corporation Law
is amended after the date of the filing of this  Certificate of Incorporation to
authorize   corporate  action  further  eliminating  or  limiting  the  personal
liability of  directors,  then the  liability  of a director of the  corporation
shall be eliminated or limited to the fullest  extent  permitted by the Delaware
General  Corporation  Law,  as so  amended  from  time to  time.  No  repeal  or
modification of this Article VIII by the stockholders shall adversely affect any
right or protection of a director of the corporation  existing by virtue of this
Article VIII at the time of such repeal or modification.

                                   ARTICLE IX

                                 CORPORATE POWER

     The corporation  reserves the right to amend,  alter,  change or repeal any
provision  contained in this certificate of incorporation,  in the manner now or
hereafter prescribed by statute, and all rights conferred on stockholders herein
are granted subject to this reservation.

                                    ARTICLE X

                       CREDITOR COMPROMISE OR ARRANGEMENT

     Whenever a compromise or arrangement is proposed  between this  corporation
and its creditors or any class of them and/or between this  corporation  and its
stockholders  or any class of them, any court of equitable  jurisdiction  within
the  State  of  Delaware  may,  on the  application  in a  summary  way of  this
corporation or of any creditor or stockholder  thereof or on the  application

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of any receiver or receivers appointed for this corporation under the provisions
of section 291 of Title 8 of the Delaware Code or on the application of trustees
in  dissolution or of any receiver or receivers  appointed for this  corporation
under the  provisions  of Section  279 of Title 8 of the  Delaware  Code order a
meeting of the creditors or class of creditors,  and/or of the  stockholders  or
class of stockholders of this corporation, as the case may be, to be summoned in
such  manner as the said court  directs.  If a majority  in number  representing
three-fourths  in value of the  creditors or class of  creditors,  and/or of the
stockholders or class of stockholders of this  corporation,  as the case may be,
agree  to any  compromise  or  arrangement  and to any  reorganization  of  this
corporation  as a  consequence  of such  compromise  or  arrangement,  the  said
compromise or arrangement  and the said  reorganization  shall, if sanctioned by
the court to which the said  application  has been  made,  be binding on all the
creditors  or class of  creditors,  and/or on all the  stockholders  or class of
stockholders,  of  this  corporation,  as the  case  may  be,  and  also on this
corporation.

     THE UNDERSIGNED, being the incorporator hereinbefore named, for the purpose
of forming a  corporation  to do  business  both within and without the State of
Delaware,  and in pursuance of the Delaware General Corporation Law, does hereby
make and file this Certificate.

Date:  March 25, 1992

                                                /s/ Gerard A. Thompson
                                                --------------------------------
                                                Gerard A. Thompson

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                            CERTIFICATE OF AMENDMENT
                                       OF
                          CERTIFICATE OF INCORPORATION
                                       OF
                   SEMINOLE COUNTY AMBULANCE ACQUISITION, INC.

     Seminole County Ambulance Acquisition,  Inc., a corporation organized under
the General Corporation Law of the State of Delaware (the "Corporation"), hereby
certifies as follows:

     1.   Article I of the  Certificate of  Incorporation  of the Corporation is
hereby amended to read in its entirety as follows:

                                   "ARTICLE I

          The name of the Corporation is Seminole County Ambulance, Inc."

     2.   The amendment set forth has been duly approved by the directors of the
Corporation and by the stockholders entitled to vote thereon.

     3.   The  amendment  set  forth was duly  adopted  in  accordance  with the
provisions  of  Section  242 of the  General  Corporation  Law of the  State  of
Delaware.

     IN  WITNESS  WHEREOF,  I,  the  undersigned,  being  the  president  of the
Corporation, for the purpose of amending the Certificate of Incorporation of the
Corporation  pursuant to Section 242 of the General Corporation Law of the State
of Delaware, do make and file this certificate,  hereby declaring and certifying
that the facts herein  stated are true,  and  accordingly  have  hereunto set my
hand, this 21 day of August, 1992.

                                                /s/ George B. DeHuff III
                                                --------------------------------
                                                George B. DeHuff III

Attest:

/s/ Gerard A. Thompson
- -----------------------------
Gerard A. Thompson
Assistant Secretary

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                    CERTIFICATE OF CHANGE OF REGISTERED AGENT

                                       AND

                                REGISTERED OFFICE
                                    * * * * *

     Seminole County Ambulance, Inc., a corporation organized and existing under
and by virtue of the  General  Corporation  Law of the State of  Delaware,  DOES
HEREBY CERTIFY:

     The present registered agent of the corporation is

     The  Prentice-Hall  Corporation  System,  Inc.  and the present  registered
office of the corporation is in the county of New Castle.

     The Board of  Directors  of Seminole  County  Ambulance,  Inc.  adopted the
following resolution on the 22 day of November, 1995.

     Resolved, that the registered office of Seminole County Ambulance,  Inc. in
the state of Delaware be and it hereby is changed to  Corporation  Trust Center,
1209 Orange  Street,  in the City of Wilmington,  County of New Castle,  and the
authorization  of the present  registered  agent of this  corporation be and the
same is hereby  withdrawn,  and THE CORPORATION  TRUST COMPANY,  shall be and is
hereby constituted and appointed the registered agent of this corporation at the
address of its registered office.

     IN WITNESS  WHEREOF,  Seminole  County  Ambulance,  Inc.  has  caused  this
statement  to be  signed  by Robert H.  Byrne,  its  Secretary*,  this 22 day of
November, 1995.

/s/      X
- ------------------------------------
Secretary
(Title)

*Any  authorized  officer  or the  chairman  or  Vice-Chairman  of the  Board of
Directors may execute this certificate.

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