<PAGE>   1
                                                                  Exhibit 10.36 
                              PROMISSORY NOTE

<TABLE>
<CAPTION>
Principal       Loan Date       Maturity        Loan No     Call  Collateral   Account   Officer   Initials
$216,000.00     09-09-1996      09-06-2000      133802163                                RS
           References in the shaded area are for Lender's use only and do not limit the applicability of this document to
                                                      any particular loan or item.
<SC>         <C>                                                       <C>       <C>
Borrower:    Brandon Diagnostic Center Ltd.                            Lender:   South Hillsborough Community Bank
             747 W. Brandon Blvd.                                                Main Office
             Brandon, FL  33571                                                  6542 US HWY 41 N
                                                                                 PO BOX 3830
                                                                                 Apollo Beach, FL  33572
====================================================================================================================================
Principal Amount:  $216,000.00          Initial Rate:  9.250%                 Date of Note: September 9, 1996
</TABLE>

PROMISE TO PAY.  Brandon Diagnostic Center Ltd. ("Borrower") promises to pay to
SOUTH HILLSBOROUGH COMMUNITY BANK ("Lender"), or order, in lawful money of the
United States of America, the principal amount of Two Hundred Sixteen Thousand &
00/100 Dollars ($216,000.00), together with interest on the unpaid principal
balance from September 9, 1996, until paid in full.  The interest rate will not
increase above 18.000%.

PAYMENT.  Subject to any payment changes resulting from changes in the index,
Borrower will pay this loan in 47 principal payments of $4,500.00 each and one
final principal and interest payment of $4,534.69.  Borrower's first principal
payment is due October 6, 1996, and all subsequent principal payments are due on
the same day of each month after that.  In addition, Borrower will pay regular
monthly payments of all accrued unpaid interest due as of each payment date. 
Borrower's first interest payment is due October 6, 1996, and all subsequent
interest payments are due on the same day of each month after that.  Borrower's
final payment due September 6, 2000, will be for all principal and accrued
interest not yet paid.  Interest on this Note is computed on a 30/360 simple
interest basis; that is, with the exception of odd days in the first payment
period, monthly interest is calculated by applying the ratio of the annual 
interest rate over a year of 360 days, multiplied by the outstanding principal 
balance, multiplied by a month of 30 days.  Interest for the odd days is 
calculated on the basis of the actual days to the next full month and a 
360-day year.  Borrower will pay Lender at Lender's address shown above or at 
such other place as Lender may designate in writing.  Unless otherwise agreed 
or required by applicable law, payments will be applied first to accrued 
unpaid interest, then to principal, and any remaining amount to any unpaid 
collection costs and late charges.

VARIABLE INTEREST RATE.  The interest rate on this Note is subject to change
from time to time based on changes in an index which is Lender's Prime Rate (the
"Index").  This is the rate Lender charges, or would charge, on 90-day unsecured
loans to the most creditworthy corporate customers.  This rate may or may not be
the lowest rate available from Lender at any given time.  Lender will tell
Borrower the current Index rate upon Borrower's request.  Borrower understands
that Lender may make loans based on other rates as well.  The interest rate
change will not occur more often than each YEAR.  The index currently is 8.250%
per annum.  The interest rate to be applied to the unpaid principal balance of
this Note will be at a rate of 1.000 percentage point over the index, adjusted
if necessary for the maximum rate limitation described below, resulting in an
initial rate of 9.250% per annum.  Notwithstanding any other provision of this
Note, the variable interest rate or rates provided for in this Note will be
subject to the following maximum rate.  NOTICE:  Under no circumstances will the
effective rate of interest on this Note be more than (except for any higher
default rate shown below) the lesser of 18.000% per annum or the maximum rate
allowed by applicable law.

PREPAYMENT; MINIMUM INTEREST CHARGE.  Borrower agrees that all loan fees and
other prepaid finance charges are earned fully as of the date of the loan and
will not be subject to refund upon early payment (whether voluntary or as a
result of default), except as otherwise required by law.  In any event, even
upon full prepayment of this Note, Borrower understands that Lender is entitled
to a minimum interest charge of $10.00.  Other than Borrower's obligation to pay
any minimum interest charge,  Borrower may pay without penalty all or a portion
of the amount owed earlier than it is due.  Early payments will not, unless 
agreed to by Lender in writing, relieve Borrower of Borrower's obligation to 
continue to make payments under the payment schedule.  Rather, they will 
reduce the principal balance due and may result in Borrower's making fewer 
payments.

LATE CHARGE.  If a payment is 10 days or more late, Borrower will be charged
5.000% of the regularly scheduled payment.

DEFAULT.  Borrower will be in default if any of the following happens:  (a)
Borrower fails to make any payment when due.  (b) Borrower breaks any promise
Borrower has made to Lender, or Borrower fails to comply with or to perform when
due any other term, obligation, covenant, or condition contained in this Note or
any agreement related to this Note, or in any other agreement or loan Borrower
has with Lender.  (c) Borrower defaults under any loan, extension of credit,
security agreement, purchase or sales agreement, or any other agreement, in
favor of any other creditor or person that may materially affect any of
Borrower's property or Borrower's ability to repay this Note or perform
Borrower's obligations under this Note or any of the Related Documents.  (d) Any
representation or statement made or furnished to Lender by Borrower or on
Borrower's behalf is false or misleading in any material respect either now or
at the time made or furnished.  (e) Any partner dies or any of the partners or
Borrower becomes insolvent, a receiver is appointed for any part of Borrower's
property, Borrower makes an assignment for the benefit of creditors, or any
proceeding is commenced either by Borrower or against Borrower under any
bankruptcy or insolvency laws.  (f) Any creditor tries to take any of Borrower's
property on or in which Lender has a lien or security interest.  This includes a
garnishment of any of Borrower's accounts with Lender.  (g) Any of the events
described in this default section occurs with respect to any general partner of
Borrower or any guarantor of this Note.  (h) A material adverse change occurs in
Borrower's financial condition, or Lender believes the prospect of payment or
performance of the indebtedness is impaired.  (i) Lender in good faith deems
itself insecure.

LENDER'S RIGHTS.  Upon default, Lender may declare the entire unpaid principal
balance on this Note and all accrued unpaid interest immediately due, without
notice, and then Borrower will pay that amount.  Upon default, including failure
to pay upon final maturity, Lender, at its option, may also, if permitted under
applicable law, increase the variable interest rate on this Note to 18.000% per
annum, if and to the extent that the increase does not cause the interest rate
to exceed the maximum rate permitted by applicable law.  Lender may hire or pay
someone else to help collect this Note if Borrower does not pay.  Borrower also
will pay Lender the amount of these costs and expenses, which includes, subject
to any limits under applicable law, Lender's reasonable attorneys' fees and
Lender's legal expenses whether or not there is a lawsuit, including reasonable
attorneys' fees and legal expenses for bankruptcy proceedings (including efforts
to modify or vacate any automatic stay or injunction), appeals, and any
anticipated post-judgment collection services.  If not prohibited by applicable
law, Borrower also will pay any court costs, in addition to all other sums
provided by law.  This Note has been delivered to Lender and accepted by Lender
in the State of Florida.  If there is a lawsuit, Borrower agrees upon Lender's
request to submit to the jurisdiction of the courts of HILLSBOROUGH County, the
State of Florida.  Lender and Borrower hereby waive the right to any jury trial
in any action, proceeding, or counterclaim brought by either Lender or Borrower
against the other.  This Note shall be governed by and construed in accordance
with the laws of the State of Florida.

RIGHT OF SETOFF.  Borrower grants to Lender a contractual possessory security
interest in, and hereby assigns, conveys, delivers, pledges, and transfers to
Lender all Borrower's right, title and interest in and to, Borrower's accounts
with Lender (whether checking, savings, or some other account), including
without limitation all accounts held jointly with someone else and all accounts
Borrower may open in the future, excluding however all IRA and Keogh accounts,
and all trust accounts for which the grant of a security interest would be
prohibited by law.  Borrower authorizes Lender, to the extent permitted by
applicable law, to charge or setoff all sums owing on this Note against any and
all such accounts.

GARNISHMENT.  Borrower consents to the issuance of a continuing writ of
garnishment or attachment against Borrower's disposable earnings, in accordance
with Section 222.11, Florida Statutes, in order to satisfy, in whole or in part,
any money judgment entered in favor of Lender.

COLLATERAL. This Note is secured by a Security agreement for Medical Equipment,
from Brandon Diagnostic Center Ltd. to South Hillsborough Community Bank dated
September 6, 1996.

GENERAL PROVISIONS.  If any part of this Note cannot be enforced, this fact will
not affect the rest of the Note.  Borrower does not agree or intend to pay, and
Lender does not agree or intend to contract for, charge, collect, take, reserve
or receive (collectively referred to herein as "charge or collect"), any amount
in the nature of interest or in the nature of a fee for this loan, which would
in any way or event (including demand, prepayment, or acceleration) cause Lender
to charge or collect more for this loan than the maximum Lender would be
permitted to charge or collect by federal law or the law of the State of Florida
(as applicable).  Any such excess interest or unauthorized fee shall, instead of
anything stated to the contrary, be applied first to reduce the principal 
balance of this loan, and when the principal has been paid in full, be refunded 
to Borrower.  Lender may delay or forgo enforcing any of its rights or remedies 
under this Note without losing them.  Borrower and any other person who signs,
guarantees or endorses this Note, to the extent allowed by law, waive
presentment, demand for payment, protest and notice of dishonor.  Upon any
change in the terms of this Note, and unless otherwise expressly stated in
writing, no party who signs this Note, whether as maker, guarantor,
accommodation maker or endorser, shall be released from liability.  All such
parties agree that Lender may renew or extend (repeatedly and for any length of
time) this loan, or release any party, partner, or guarantor or collateral; or
impair, fail to realize upon or protect Lender's security interest in the
collateral; and take any other action deemed necessary by Lender without the
consent of or notice to anyone.  All such parties also agree that Lender may
modify this loan without the consent of or notice to anyone other than the party
with whom the modification is made.
  

<PAGE>   2


                                                         
09-06-1996                      PROMISSORY NOTE                  Page 2
Loan No 133802163                 (continued)             
================================================================================

PRIOR TO SIGNING THIS NOTE, BORROWER READ AND UNDERSTOOD ALL THE PROVISIONS OF
THIS NOTE, INCLUDING THE VARIABLE INTEREST RATE PROVISIONS. BORROWER AGREES TO
THE TERMS OF THE NOTE AND ACKNOWLEDGES RECEIPT OF A COMPLETED COPY OF THE NOTE.

BORROWER:

BRANDON DIAGNOSTIC CENTER LTD.

BY: /s/ CURTIS L. ALLISTON                                    (SEAL)
   -----------------------------------------------------------
   Alpha Associates, Inc., General Partner, Curtis L. Alliston

================================================================================
Variable Rate, Principal + Interest
<PAGE>   3
                           BUSINESS LOAN AGREEMENT


<TABLE>
<CAPTION>
        Principal         Loan Date        Maturity         Loan No.       Call     Collateral     Account     Officer     Initials
      <S>                 <C>             <C>              <C>            <C>       <C>            <C>        <C>         <C>
      $216,000.00         09-09-1996      09-06-2000       133802163                                           RS
References in the shaded area are for Lender's use only and do not limit the applicability of the document to any particular loan or
item.

<CAPTION>

<S>             <C>                                                             <C>
Borrower:       Brandon Diagnostic Center Ltd.                                  Lender:        SOUTH HILLSBOROUGH COMMUNITY BANK
                747 W. Brandon Blvd.                                                           MAIN OFFICE
                Brandon, FL  33571                                                             6542 US HWY 41 N
                                                                                               PO BOX 3830
                                                                                               APOLLO BEACH, FL  33572
</TABLE>

THIS BUSINESS LOAN AGREEMENT between Brandon Diagnostic Center Ltd. ("Borrower")
and SOUTH HILLSBOROUGH COMMUNITY BANK ("Lender") is made and executed on the
following terms and conditions.  Borrower has received prior commercial loans
from Lender or has applied to Lender for a commercial loan or loans and other
financial accommodations, including those which may be described on any exhibit
or schedule attached to this Agreement.  All such loans and financial
accommodations, together with all future loans and financial accommodations from
Lender to Borrower, are referred to in this Agreement individually as the "Loan"
and collectively as the "Loans."  Borrower understands and agrees that:  (a) in
granting, renewing, or extending any Loan, Lender is relying upon Borrower's
representations, warranties, and agreements, as set forth in this Agreement; (b)
the granting, renewing, or extending of any Loan by Lender at all times shall
be subject to Lender's sole judgment and discretion; and (c) all such Loans
shall be and shall remain subject to the following terms and conditions of this
Agreement.

TERM.  This Agreement shall be effective as of September 6, 1996, and shall
continue thereafter until all Indebtedness of Borrower to Lender has been
performed in full and the parties terminate this Agreement in writing.

DEFINITIONS.  The following words shall have the following meanings when used in
this Agreement.  Terms not otherwise defined in this Agreement shall have the
meanings attributed to such terms in the Uniform Commercial Code.  All 
references to dollar amounts shall mean amounts in lawful money of the United
States of America.

    AGREEMENT.  The word "Agreement" means this Business Loan Agreement, as this
    Business Loan Agreement may be amended or modified from time to time,
    together with all exhibits and schedules attached to this Business Loan
    Agreement from time to time.

    BORROWER.  The word "Borrower" means Brandon Diagnostic Center Ltd.  The
    word "Borrower" also includes, as applicable, all subsidiaries and
    affiliates of Borrower as provided below in the paragraph titled
    "Subsidiaries and Affiliates."

    CERCLA.  The word "CERCLA" means the Comprehensive Environmental Response,  
    Compensation, and Liability Act of 1980, as amended.

    COLLATERAL.  The word "Collateral" means and includes without limitation all
    property and assets granted as collateral security for a Loan, whether real
    or personal property, whether granted directly or indirectly, whether
    granted now or in the future, and whether granted in the form of a security 
    interest, mortgage, deed of trust, assignment, pledge, chattel mortgage,
    chattel trust, factor's lien, equipment trust, conditional sale, trust
    receipt, lien, charge, lien or little retention contract, lease or
    consignment intended as a security device, or any other security or lien
    interest whatsoever, whether created by law, contract, or otherwise.

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

    EVENT OF DEFAULT.  The words "Event of Default" mean and include without
    limitation any of the Events of Default set forth below in the section
    titled "EVENTS OF DEFAULT."

    GRANTOR.  The word "Grantor" means and includes without limitation each and
    all of the persons or entities granting a Security Interest in any
    Collateral for the indebtedness, including without limitation all Borrowers
    granting such a Security Interest.

    GUARANTOR.  The word "Guarantor" means and includes without limitation each
    and all of the guarantors, sureties, and accommodation parties in
    connection with any indebtedness.

    INDEBTEDNESS.  The word "Indebtedness" means and includes without limitation
    all Loans, together with all other obligations, debts and liabilities of
    Borrower to Lender, or any one or more of them, as well as all claims by
    Lender against Borrower, or any one or more of them; whether now or
    hereafter existing, voluntary or involuntary, due or not due, absolute or
    contingent, liquidated or unliquidated; whether Borrower may be liable
    individually or jointly with others; whether Borrower may be obligated as a
    guarantor, surety, or otherwise; whether recovery upon such indebtedness may
    be or hereafter may become barred by any statute of limitations; and
    whether such indebtedness may be or hereafter may become otherwise
    unenforceable.

    LENDER.  The word "Lender" means SOUTH HILLSBOROUGH COMMUNITY BANK, its     
    successors and assigns.

    LOAN.  The word "Loan" or "Loans" means and includes without limitation any
    and all commercial loans and financial accommodations from Lender to
    Borrower, whether now or hereafter existing, and however evidenced,
    including without limitation those loans and financial accommodations
    described herein or described on any exhibit or schedule attached to this
    Agreement from time to time.

    NOTE.  The word "Note" means and includes without limitation Borrower's
    promissory note or notes, if any, evidencing Borrower's Loan obligations in
    favor of Lender, as well as any substitute, replacement or refinancing note
    or notes therefor.

    PERMITTED LIENS.  The words "Permitted Liens" mean:  (a) liens and security
    interests securing indebtedness owed by Borrower to Lender; (b) liens for
    taxes, assessments, or similar charges either not yet due or being 
    contested in good faith; (c) liens of materialmen, mechanics, warehousemen,
    or carriers, or other like liens arising in the ordinary course of business
    and securing obligations which are not yet delinquent; (d) purchase money
    liens or purchase money security interests upon or in any property acquired
    or held by Borrower in the ordinary course of business to secure
    indebtedness outstanding on the date of this Agreement or permitted to be
    incurred under the paragraph of this Agreement titled "Indebtedness and
    Liens"; (e) liens and security interests which, as of the date of this
    Agreement, have been disclosed to and approved by the Lender in writing;
    and (f) those liens and security interests which in the aggregate
    constitute an immaterial and insignificant monetary amount with respect
    to the net value of Borrower's assets.

    RELATED DOCUMENTS.  The words "Related Documents" mean and include without
    limitation all promissory notes, credit agreements, loan agreements,
    environmental agreements, guaranties, security agreements, mortgages, deeds
    of trust, and all other instruments, agreements and documents, whether now
    or hereafter existing, executed in connection with the Indebtedness.

    SECURITY AGREEMENT.  The words "Security Agreement" mean and include
    without limitation any agreements, promises, covenants, arrangements,
    understandings or other agreements, whether created by law, contract, or
    otherwise, evidencing, governing, representing, or creating a Security
    Interest.

    SECURITY INTEREST.  The words "Security Interest" mean and include without
    limitation any type of collateral security, whether in the form of a lien,
    charge, mortgage, deed of trust, assignment, pledge, chattel mortgage,
    chattel trust, factor's lien, equipment trust, conditional sale, trust
    receipt, lien or title retention contract, lease or consignment intended as
    a security device, or any other security or lien interest whatsoever,
    whether created by law, contract, or otherwise.

    SARA.  The word "SARA" means the Superfund Amendments and Reauthorization
    Act of 1986 as now or hereafter amended.

CONDITIONS PRECEDENT TO EACH ADVANCE.  Lender's obligation to make the Initial
Loan Advance and each subsequent Loan Advance under this Agreement shall be
subject to the fulfillment to Lender's satisfaction of all of the conditions
set forth in this Agreement and in the Related Documents.

    LOAN DOCUMENTS.  Borrower shall provide to Lender in form satisfactory to
    Lender the following documents for the Loan:  (a) the Note, (b) Security
    Agreements granting to Lender security interests in the Collateral, (c)
    Financing Statements perfecting Lender's Security Interests; (d) evidence
    of insurance as required below; and (e) any other documents required under
    this Agreement or by Lender or its counsel, including without limitation any
    guaranties described below.

    BORROWER'S AUTHORIZATION.  Borrower shall have provided in form and
    substance satisfactory to Lender properly certified resolutions, duly
    authorizing the execution and delivery of this Agreement, the Note and the
    Related Documents, and such other authorizations and other documents and
    instruments as Lender or its counsel, in their sole discretion, may
    require.

    PAYMENT OF FEES AND EXPENSES.  Borrower shall have paid to Lender all fees,
    charges, and other expenses which are then due and payable as specified in
    this Agreement or any Related Document.

    REPRESENTATIONS AND WARRANTIES.  The representations and warranties set
    forth in this Agreement, in the Related Documents, and in any document or
    certificate delivered to Lender under this Agreement are true and correct.

    NO EVENT OF DEFAULT.  There shall not exist at the time of any advance a 
    condition which would constitute an Event of Default under this Agreement.

REPRESENTATIONS AND WARRANTIES.  Borrower represents and warrants to Lender, as
of the date of this Agreement, as of the date of each
<PAGE>   4
09-06-1996                    BUSINESS LOAN AGREEMENT                     PAGE 2
LOAN NO. 133802163                 (CONTINUED)


disbursement of Loan proceeds, as of the date of any renewal, extension or
modification of any Loan, and at all times any indebtedness exists:

    ORGANIZATION.  Borrower is a partnership which is duly organized, validly
    existing, and in good standing under the laws of the State of Florida and
    is validly existing and in good standing in all states in which Borrower is
    doing business.

    AUTHORIZATION.  The execution, delivery, and performance of this Agreement
    and all Related Documents by Borrower, to the extent to be executed,
    delivered or performed by Borrower, have been duly authorized by all
    necessary action by Borrower; do not require the consent or approval of any
    other person, regulatory authority or governmental body; and do not
    conflict with, result in a violation of, or constitute a default under (a)
    any provision of the partnership agreement, or any agreement or other
    instrument binding upon Borrower or (b) any law, governmental regulation,
    court decree, or order applicable to Borrower.

    FINANCIAL INFORMATION.  Each financial statement of Borrower supplied to
    Lender truly and completely disclosed Borrower's financial condition as of
    the date of the statement, and there has been no material adverse change in
    Borrower's financial condition subsequent to the date of the most recent
    financial statement supplied to Lender.  Borrower has no material
    contingent obligations except as disclosed in such financial statements.

    LEGAL EFFECT.  This Agreement constitutes, and any instrument or agreement
    required hereunder to be given by Borrower when delivered will constitute,
    legal, valid and binding obligations of Borrower enforceable against
    Borrower in accordance with their respective forms.

    PROPERTIES.  Except as contemplated by this Agreement or as previously
    disclosed in Borrower's financial statements or in writing to Lender and as
    accepted by Lender, and except for property tax liens for taxes not
    presently due and payable, Borrower owns and has good title to all of
    Borrower's properties free and clear of all Security Interests, and has not
    executed any security documents or financing statements relating to such
    properties.  All of Borrower's properties are filed in Borrower's legal
    name, and Borrower has not used, or filed a financing statement under, any
    other name for at least the last five (5) years.

    HAZARDOUS SUBSTANCES.  The terms "hazardous waste," "hazardous substance,"
    "disposal," "release," and "threatened release," as used in this Agreement,
    shall have the same meanings as set forth in the "CERCLA," "SARA," the
    Hazardous Materials Transportation Act, 49 U.S.C. Section 1801, et seq., the
    Resource Conservation and Recovery Act, 42 U.S.C. Section 6901, et seq., or
    other applicable state or Federal laws, rules, or regulations adopted
    pursuant to any of the foregoing.  Except as disclosed to and acknowledged
    by Lender in writing, Borrower represents and warrants that:  (a) During
    the period of Borrower's ownership of the properties, there has been no
    use, generation, manufacture, storage, treatment, disposal, release or
    threatened release of any hazardous waste or substance by any person on,
    under, about or from any of the properties, (b) Borrower has no knowledge
    of, or reason to believe that there has been (i) any use, generation,
    manufacture, storage, treatment, disposal, release, or threatened release
    of any hazardous waste or substance on, under, about or from the properties
    by any prior owners or occupants of any of the properties, or (ii) any
    actual or threatened litigation or claims of any kind by any person
    relating to such matters, (c) Neither Borrower nor any tenant, contractor,
    agent or other authorized user of any of the properties shall use,
    generate, manufacture, store, treat, dispose of, or release any hazardous
    waste or substance on, under, about or from any of the properties; and any
    such activity shall be conducted in compliance with all applicable federal,
    state, and local laws, regulations, and ordinances, including without
    limitation those laws, regulations and ordinances described above. 
    Borrower authorizes Lender and its agents to enter upon the properties to
    make such inspections and tests as Lender may deem appropriate to determine
    compliance of the properties with this section of the Agreement.  Any
    inspections or tests made by Lender shall be at Borrower's expense
    and for Lender's purposes only and shall not be construed to create any
    responsibility or liability on the part of Lender to Borrower or to any
    other person.  The representations and warranties contained herein are
    based on Borrower's due diligence in investigating the properties for
    hazardous waste and hazardous substances.  Borrower hereby (a) releases and
    waives any future claims against Lender for indemnity or contribution in
    the event Borrower becomes liable for cleanup or other costs under any such
    laws, and (b) agrees to indemnify and hold harmless Lender against any and
    all claims, losses, liabilities, damages, penalties, and expenses which
    Lender may directly or indirectly sustain or suffer resulting from a breach
    of this section of the Agreement or as a consequence of any use,
    generation, manufacture, storage, disposal, release or threatened release
    occurring prior to Borrower's ownership or interest in the properties,
    whether or not the same was or should have been known to Borrower.  The
    provisions of this section of the Agreement, including the obligation to
    indemnify, shall survive the payment of the indebtedness and the
    termination or expiration of this Agreement and shall not be affected by
    Lender's acquisition of any interest in any of the properties, whether by
    foreclosure or otherwise.

    LITIGATION AND CLAIMS.  No litigation, claim, investigation, administrative
    proceeding or similar action (including those for unpaid taxes) against
    Borrower is pending or threatened, and no other event has occurred which may
    materially adversely affect Borrower's financial condition or properties,
    other than litigation, claims, or other events, if any, that have been
    disclosed to and acknowledged by Lender in writing.

    TAXES.  To the best of Borrower's knowledge, all tax returns and reports of
    Borrower that are or were required to be filed, have been filed, and as
    taxes, assessments and other governmental charges have been paid in full,
    except those presently being or to be contested by Borrower in good faith
    in the ordinary course of business and for which adequate reserves have
    been provided.

    LIEN PRIORITY.  Unless otherwise previously disclosed to Lender in writing,
    Borrower has not entered into or granted any Security Agreements, or
    permitted the filing or attachment of any Security Interests on or
    affecting any of the Collateral directly or indirectly securing repayment of
    Borrower's Loan and Note, that would be prior or that may in any way be
    superior to Lender's Security interests and rights in and to such
    Collateral.

    BINDING EFFECT.  This Agreement, the Note, all Security Agreements directly
    or indirectly securing repayment of Borrower's Loan and Note and all of the
    Related Documents are binding upon Borrower as well as upon Borrower's
    successors, representatives and assigns, and are legally enforceable in     
    accordance with their respective terms.

    COMMERCIAL PURPOSES.  Borrower intends to use the Loan proceeds solely for  
    business or commercial related purposes.

    EMPLOYEE BENEFIT PLANS.  Each employee benefit plan as to which Borrower
    may have any liability complies in all material respects with all applicable
    requirements of law and regulations, and (i) no Reportable Event nor
    Prohibited Transaction (as defined in ERISA) has occurred with respect to
    any such plan, (ii) Borrower has not withdrawn from any such plan or 
    initiated steps to do so, (iii) no steps have been taken to terminate any
    such plan, and (iv) there are no unfunded liabilities other than those
    previously disclosed to Lender in writing.

    LOCATION OF BORROWER'S OFFICES AND RECORDS.  Borrower's place of business,
    or Borrower's Chief executive office, if Borrower has more than one place
    of business, is located at 747 W. Brandon Blvd., Brandon, FL  33511.  Unless
    Borrower has designated otherwise in writing this location is also the
    office or offices where Borrower keeps its records concerning the
    Collateral.

    INFORMATION.  All information heretofore or contemporaneously herewith
    furnished by Borrower to Lender for the purposes of or in connection with
    this Agreement or any transaction contemplated hereby is, and all
    information hereafter furnished by or on behalf of Borrower to Lender will
    be, true and accurate in every material respect on the date as of which
    such information is dated or certified; and none of such information is or
    will be incomplete by omitting to state any material fact necessary to
    make such information not misleading.

    SURVIVAL OF REPRESENTATIONS AND WARRANTIES.  Borrower understands and
    agrees that Lender, without independent investigation, is relying upon the
    above representations and warranties in making the above referenced Loan to
    Borrower.  Borrower further agrees that the foregoing representations and
    warranties shall be continuing in nature and shall remain in full force and
    effect until such time as Borrower's indebtedness shall be paid in full, or
    until this Agreement shall be terminated in the manner provided above,
    whichever is the last to occur.

AFFIRMATIVE COVENANTS.  Borrower covenants and agrees with Lender that, while
this Agreement is in effect, Borrower will:

    LITIGATION.  Promptly inform Lender in writing of (a) all material adverse
    changes in Borrower's financial condition, and (b) all existing and all
    threatened litigation, claims, investigations, administrative proceedings
    or similar actions affecting Borrower or any Guarantor which could
    materially affect the financial condition of Borrower or the financial
    condition of any Guarantor.

    FINANCIAL RECORDS.  Maintain its books and records in accordance with
    generally accepted accounting principles, applied on a consistent basis,
    and permit Lender to examine and audit Borrower's books and records at all
    reasonable times.

    ADDITIONAL INFORMATION.  Furnish such additional information and statements,
    lists of assets and liabilities, agings of receivables and payables
    inventory schedules, budgets, forecasts, tax returns, and other reports
    with respect to Borrower's financial condition and business operations as
    Lender may request from time to time.

    INSURANCE.  Maintain fire and other risk insurance, public liability
    insurance, and such other insurance as Lender may require with respect to
    Borrower's properties and operations, in form, amounts, coverages and with
    insurance companies reasonably acceptable to Lender.  Borrower, upon
    request of Lender, will deliver to Lender from time to time the policies or
    certificates of insurance in form satisfactory to Lender, including
    stipulations that coverages will not be cancelled or diminished without at
    least ten (10) days' prior written notice to Lender.  Each insurance policy
    also shall include an endorsement providing that coverage in favor of 
    Lender will not be impaired in any way by any act, omission or default of
    Borrower or any other person.  In connection with all policies covering
    assets in which Lender holds or is offered a security interest for the
    Loans, Borrower will provide Lender with such loss payable or other
    endorsements as Lender may require.

    INSURANCE REPORTS.  Furnish to Lender, upon request of Lender, reports on
    each existing insurance policy showing such information as Lender may
    reasonably request, including without limitation the following:  (a) the
    name of the insurer; (b) the risks insured; (c) the amount of the policy;
    (d) the properties insured; (e) the then current property values on the
    basis of which insurance has been obtained, and the manner of determining
    those values; and (f) the expiration date of the policy.  In addition, upon
    request of Lender (however not more often than annually).  Borrower will
    have an independent appraiser satisfactory to Lender determine, as
    applicable, the actual cash value or replacement cost of any


<PAGE>   5
                           BUSINESS LOAN AGREEMENT
09-06-1996                       (Continued)                           Page 3
Loan No 133802163
================================================================================
        collateral.  The cost of such appraisal shall be paid by Borrower.
        
        GUARANTIES.  Prior to disbursement of any Loan proceeds, furnish 
        executed guaranties of the Loans in favor of Lender, on Lender's forms,
        and in the amounts and by the guarantors named below:


                GUARANTORS                        AMOUNTS
                National Diagnostics, Inc.      300,000.00
                Alpha Associates, Inc.          300,000.00

        OTHER AGREEMENTS.  Comply with all terms and conditions of all other
        agreements, whether now or hereafter existing, between Borrower and any
        other party and notify Lender immediately in writing of any default in 
        connection with any other such agreements.

        LOAN PROCEEDS.  Use all Loan proceeds solely for Borrower's business
        operations, unless specifically consented to the contrary by Lender in
        writing.

        TAXES, CHARGES, AND LIENS.  Pay and discharge when due all of its
        indebtedness and obligations, including without limitation all
        assessments, taxes, governmental charges, levies and liens, of every
        kind and nature, imposed upon Borrower of its properties, income, or
        profits, prior to the date on which penalties would attach, and all
        lawful claims that, if unpaid, might become a lien or charge upon any
        of Borrower's properties, income, or profits.  Provided however,
        Borrower will not be required to pay and discharge any such assessment,
        tax, charge, levy, lien or claims so long as (a) the legality
        of the same shall be contested in good faith by appropriate proceedings,
        and (b) Borrower shall have established on its books adequate reserves
        with respect to such contested assessment, tax, charge, levy, lien, or
        claim in accordance with generally accepted accounting practices. 
        Borrower, upon demand of Lender, will furnish to Lender evidence of
        payment of the assessments, taxes, charges, levies, liens and claims
        and will authorize the appropriate governmental official to deliver to
        Lender at any time a written statement of any assessments, taxes,
        charges, levies, liens and claims against (Borrower's properties,
        income, or profits.

        PERFORMANCE.  Perform and comply with all terms, conditions, and 
        provisions set forth in this Agreement and in the Related Documents 
        in a timely manner, and promptly notify Lender if Borrower learns of the
        occurrence of any event which constitutes an Event of Default under
        this Agreement or under any of the Related Documents.

        OPERATIONS.  Maintain executive and management personnel with 
        substantially the same qualifications and experience as the present     
        executive and management personnel; provide written notice to Lender of
        any change in executive and management personnel; conduct its business
        affairs in a reasonable and prudent manner and in compliance with all
        applicable federal, state and municipal laws, ordinances, rules and
        regulations respecting its properties, charters, businesses and
        operations, including without limitation, compliance with the Americans
        With Disabilities Act and with all minimum funding standards and other
        requirements of ERISA and other laws applicable to Borrower's employee
        benefit plans.

        INSPECTION.  Permit employees or agents of Lender at any reasonable 
        time to inspect any and all Collateral for the Loan or Loans
        and Borrower's other properties and to examine or audit Borrower's
        books, accounts, and records and to make copies and memoranda of
        Borrower's books, accounts, and records.  If Borrower now or at any
        time hereafter maintains any records (including without limitation
        computer generated records and computer software programs for the
        generation of such records) in the possession of a third party,
        Borrower, upon request of Lender, shall notify such party to permit
        Lender free access to such records at all reasonable times and to
        provide Lender with copies of any records it may request, all at
        Borrower's expense.

        COMPLIANCE CERTIFICATE.  Unless waived in writing by Lender, provide 
        Lender at least annually and at the time of each disbursement
        of Loan proceeds with a certificate executed by Borrower's chief
        financial officer, or other officer or person acceptable to Lender,
        certifying that the representations and warranties set forth in this
        Agreement are true and correct as of the date of the certificate and
        further certifying that, as of the date of the certificate, no Event of
        Default exists under this Agreement.

        ENVIRONMENTAL COMPLIANCE AND REPORTS.  Borrower shall comply in all 
        respects with all environmental protection federal, state and local
        laws, statutes, regulations and ordinances; not cause or permit to
        exist, as a result of an intentional or unintentional action or
        omission on its part or on the part of any third party, on property
        owned and/or occupied by Borrower, any environmental activity where
        damage may result to the environment, unless such environmental
        activity is pursuant to and in compliance with the conditions of a
        permit issued by the appropriate federal, state or local governmental
        authorities; shall furnish to Lender promptly and in any event within   
        thirty (30) days after receipt thereof a copy of any notice, summons,
        lien, citation, directive, letter or other communication from any
        governmental agency or instrumentality concerning any intentional or
        unintentional action or omission on Borrower's part in connection with
        any environmental activity whether or not there is damage to the
        environment and/or other natural resources.

        ADDITIONAL ASSURANCES.  Make, execute and deliver to Lender such
        promissory notes, mortgages, deeds of trust, security
        agreements, financing statements, instruments, documents and other
        agreements as Lender or its attorneys may reasonably request to
        evidence and secure the Loans and to perfect all Security interests.

NEGATIVE COVENANTS.  Borrower covenants and agrees with Lender that while this
Agreement is in effect, Borrower shall not, without the prior written consent
of Lender:

        INDEBTEDNESS AND LIENS.  (a) Except for trade debt incurred in the
        normal course of business and indebtedness to Lender contemplated by 
        this Agreement, create, incur or assume indebtedness for borrowed 
        money, (b) except as allowed as a Permitted Lien, sell, transfer, 
        mortgage, assign, pledge, lease, grant a security interest in, or 
        encumber any of Borrower's assets, or (c) sell with recourse any
        of Borrower's accounts, except to Lender.

        CONTINUITY OF OPERATIONS.  (a) Engage in any business activities
        substantially different than those in which Borrower is presently       
        engaged, (b) cease operations, liquidate, merge, transfer, change
        ownership, change its name, dissolve or transfer or sell Collateral out
        of the ordinary course of business, or (c) make any distribution with
        respect to any capital account, whether by reduction of capital or
        otherwise.

        LOANS, ACQUISITIONS AND GUARANTIES.  (a) Loan, invest in or advance
        money or assets, (b) incur any obligation as surety or guarantor other
        than in the ordinary course of business.

CESSATION OF ADVANCES.  If Lender has made any commitment to make any Loan to
Borrower, whether under this Agreement or under any other agreement, Lender
shall have no obligation to make Loan Advances or to disburse Loan proceeds if;
(a) Borrower or any Guarantor is in default under the terms of this Agreement
or any of the Related Documents or any other agreement that Borrower or any
Guarantor has with Lender; (b) Borrower or any Guarantor becomes insolvent,
files a petition in bankruptcy or similar proceedings, or is adjudged a
bankrupt; (c) there occurs a material adverse change in Borrower's financial
condition, in the financial condition of any Guarantor, or in the value of any
Collateral securing any Loan: (d) any Guarantor seeks, claims or otherwise
attempts to limit, modify or revoke such Guarantor's guaranty of the Loan or
any other loan with Lender; or (e) Lender in good faith deems itself insecure,
even though no Event of Default shall have occurred.

RIGHT OF SETOFF.  Borrower grants to Lendor, a contractual possessory security
interest in, and hereby assigns, conveys, delivers, pledges, and transfers to
Lender all Borrower's right, title and interest in and to, Borrower's accounts
with Lender (whether checking, savings, or some other account), including
without limitation all accounts held jointly with someone else and all accounts
Borrower may open in the future, excluding however all IRA and Keogh accounts,
and all trust accounts for which the grant of a security interest would be
prohibited by law.  Borrower authorizes Lender, to the extent permitted by
applicable law, to charge or setoff all sums owing on the indebtedness against
any and all such accounts.

EVENTS OF DEFAULT.  Each of the following shall constitute an Event of Default
under this Agreement:

        DEFAULT ON INDEBTEDNESS.  Future of Borrower to make any payment when
        due on the Loans.

        OTHER DEFAULTS.  Failure of Borrower or any Grantor to comply with or to
        perform when due any other term, obligation, covenant or condition
        contained in this Agreement or in any of the Related Documents, or 
        failure of Borrower to comply with or to perform any other term, 
        obligation, covenant or condition contained in any other agreement 
        between Lender and Borrower.

        DEFAULT IN FAVOR OF THIRD PARTIES.  Should Borrower or any Grantor 
        default under any loan, extension of credit, security agreement,
        purchase or sales agreement, or any other agreement, in favor of any
        other creditor or person that may materially affect any of Borrower's
        property or Borrower's or any Grantor's ability to repay the Loans or
        perform their respective obligations under this Agreement or any of
        the Related Documents.

        FALSE STATEMENTS.  Any warranty, representation or statement made or 
        furnished to Lender by or on behalf of Borrower or any Grantor under
        this Agreement or the Related Documents is false or misleading in any
        material respect at the time made or furnished, or becomes false or
        misleading at any time thereafter.
        
        DEFECTIVE COLLATERALIZATION.  This Agreement or any of the Related
        Documents ceases to be in full force and effect (including failure
        of any Security Agreement to create a valid and perfected Security
        Interest) at any time and for any reason.

        DEATH OR INSOLVENCY.  The dissolution or termination of Borrower's 
        existence as a going business or the death of any partner, the
        insolvency of Borrower, the appointment of a receiver for any part of
        Borrower's property, any assignment for the benefit of creditors, any
        type of creditor workout, or the commencement of any proceeding under
        any bankruptcy or insolvency laws by or against Borrower.

        CREDITOR OR FORFEITURE PROCEEDINGS.  Commencement of foreclosure or
        forfeiture proceedings, whether by judicial proceeding, self-help,
<PAGE>   6

09-06-1996                 BUSINESS LOAN AGREEMENT                      Page 4
Loan No 133802163                (CONTINUED)
================================================================================

        repossession or any other method, by any creditor of Borrower, any    
        creditor of any Grantor against any collateral securing the
        indebtedness, or by any governmental agency.  This includes a
        garnishment, attachment, or levy on or of any of Borrower's deposit
        accounts with Lender.

        EVENTS AFFECTING GUARANTOR.  Any of the preceding events occurs with 
        respect to any Guarantor of any of the Indebtedness or any Guarantor
        dies or becomes incompetent, or revokes or disputes the validity of, or
        liability under, any Guaranty of the Indebtedness.

        EVENTS AFFECTING GENERAL PARTNER OF BORROWER.  Any of the preceding
        events occurs with respect to any general partner of Borrower or any
        general partner dies or becomes incompetent.

        CHANGE IN OWNERSHIP. The resignation or expulsion of any general
        partner with an ownership interest of twenty-five percent (25%) or more
        in Borrower.

        ADVERSE CHANGE.  A material adverse change occurs in Borrower's
        financial condition, or Lender believes the prospect of payment or
        performance of the indebtedness is impaired.

        INSECURITY.  Lender, in good faith, deems itself insecure.

EFFECT OF AN EVENT OF DEFAULT. If any Event of Default shall occur, except 
where otherwise provided in this Agreement or the Related Documents, all 
commitments and obligations of Lender under this Agreement or the Related
Documents or any other agreement immediately will terminate and, at Lender's 
option, all indebtedness immediately will become due and payable, all without
notice of any kind to Borrower, except that in the case of an Event of Default
of the type described in the "Insolvency" subsection above, such acceleration
shall be automatic and not optional.  In addition, Lender shall have all the
rights and remedies provided in the Related Documents or available at law, in
equity, or otherwise.  Except as may be prohibited by applicable law, all of
Lender's rights and remedies shall be cumulative and may be exercised 
singularly or concurrently.  Election by Lender to pursue any remedy shall not 
exclude pursuit of any other remedy, and an election to make expenditures or to
take action to perform an obligation of Borrower or of any Grantor shall not 
affect  Lender's right to declare a default and to exercise its rights and 
remedies.

MISCELLANEOUS PROVISIONS.  The following miscellaneous provisions are a part of
this Agreement:

        AMENDMENTS.  This Agreement, together with any Related Documents,
        constitutes the entire understanding and agreement of the parties as
        to the matters set forth in this Agreement.  No alteration of or
        amendment to this Agreement shall be effective unless given in writing
        and signed by the party or parties sought to be charged or bound by the
        alternation or amendment.

        APPLICABLE LAW.  This Agreement has been delivered to Lender and
        accepted by Lender in the State of Florida.  If there is a lawsuit,    
        Borrower agrees upon Lender's request to submit to the jurisdiction of
        the courts of HILLSBOROUGH County, the State of Florida. Lender and 
        Borrower hereby waive the right to any jury trial in any action,        
        proceeding, or counterclaim brought by either Lender or Borrower
        against the other.  This Agreement shall be governed by and construed
        in accordance with the laws of the State of Florida.

        CAPTION HEADINGS.  Caption headings in this Agreement are for
        convenience purposes only and are not to be used to interpret or define
        the provisions of this Agreement.

        CONSENT TO LOAN PARTICIPATION.  Borrower agrees and consents to
        Lender's sale or transfer, whether now or later, of one or more 
        participation interests in the Loans to one or more purchasers, whether 
        related or unrelated to Lender, Lender may provide, without any
        limitation whatsoever, to any one or more purchasers, or potential
        purchasers, any information or knowledge Lender may have about Borrower
        or about any other matter relating to the Loan, and Borrower hereby
        waives any rights to privacy it may have with respect to such matters. 
        Borrower additionally waives any and all notices of sale of
        participation interests, as well as all notices of any repurchase of
        such participation interests.  Borrower also agrees that the purchasers
        of any such participation interests will be considered as the absolute
        owners of such interests in the Loans and will have all the rights
        granted under the participation agreement or agreements governing the
        sale of such participation interests.  Borrower further waives all
        rights of offset or counterclaim that it may have now or later against
        Lender or against any purchaser of such a participation interest and
        unconditionally agrees that either Lender or such purchaser may enforce
        Borrower's obligation under the Loans irrespective of the failure or
        insolvency of any holder of any interest in the Loans.  Borrower
        further agrees that the purchaser of any such participation interests
        may enforce its interests irrespective of any personal claims or
        defenses that Borrower may have against Lender.

        COSTS AND EXPENSES.  Borrower agrees to pay upon demand all of Lender's
        expenses, including without limitation reasonable attorneys' fees,
        incurred in connection with the preparation, execution, enforcement,
        modification and collection of this Agreement or in connection with the
        Loans made pursuant to this Agreement.  Lender may pay someone else to
        help collect the Loans and to enforce this Agreement, and Borrower will
        pay that amount.  This includes, subject to any limits under applicable
        law, Lender's reasonable attorneys' fees and Lender's legal expenses, 
        whether or not there is a lawsuit, including reasonable attorneys' fees
        for bankruptcy proceedings (including efforts to modify or vacate any
        automatic stay of injunction), appeals, and any anticipated
        post-judgment collection services.  Borrower also will pay any court
        costs, in addition to all other sums provided by law.

        NOTICES.  All notices required to be given under this Agreement shall
        be given in writing, may be sent by telefacsimile, and shall be 
        effective when actually delivered or when deposited with a nationally 
        recognized overnight courier or deposited in the United States mail,
        first class, postage prepaid, addressed to the party to whom the notice
        is to be given at the address shown above.  Any party may change its
        address for notices under this Agreement by giving formal written
        notice to the other parties, specifying that the purpose of the notice
        is to change the party's address.  To the extent permitted by applicable
        law, if there is more than one Borrower, notice to any Borrower will 
        constitute notice to all Borrowers.  For notice purposes, Borrower will
        keep Lender informed at all times of Borrower's current address(es).

        SEVERABILITY.   If a court of competent jurisdiction finds any
        provision of this Agreement to be invalid or unenforceable as to any 
        person or circumstance, such finding shall not render that provision
        invalid or unenforceable as to any other persons or circumstances.
        If feasible, any such offending provision shall be deemed to be
        modified to be within the limits of enforceability or validity;
        however, if the offending provision cannot be so modified, it shall be 
        stricken and all other provisions of this Agreement in all other 
        respects shall remain valid and enforceable.

        SUBSIDIARIES AND AFFILIATES OF BORROWER.  To the extent the context of
        any provisions of this Agreement makes it appropriate, including
        without limitation any representation, warranty or covenant, the word
        "Borrower" as used herein shall include all subsidiaries and affiliates
        of Borrower.  Notwithstanding the foregoing however, under no
        circumstances shall this Agreement be construed to require Lender to
        make any Loan or other financial accommodation to any subsidiary or
        affiliate of Borrower.

        SUCCESSORS AND ASSIGNS. All covenants and agreements contained by or on
        behalf of Borrower shall bind its successors and assigns and shall inure
        to the benefit of Lender, its successors and assigns.  Borrower shall
        not, however, have the right to assign its rights under this Agreement 
        or any interest therein, without the prior written consent of Lender.

        SURVIVAL.  All warranties, representations, and covenants made by
        Borrower in this Agreement or in any certificate or other instrument
        delivered by Borrower to Lender under this Agreement shall be
        considered to have been relied upon by Lender and will survive the 
        making of the Loan and delivery to Lender of the Related Documents, 
        regardless of any investigation made by Lender or on Lender's behalf.

        TIME IS OF THE ESSENCE.  Time is of the essence in the performance of
        this Agreement.

        WAIVER.  Lender shall not be deemed to have waived any rights under
        this Agreement unless such waiver is given in writing and signed by
        Lender.  No delay or omission on the part of Lender in exercising any
        right shall operate as a waiver of such right or any other right.  A
        waiver by Lender of a provision of this Agreement shall not prejudice
        or constitute a waiver of Lender's right otherwise to demand strict
        compliance with that provision or any other provision of this 
        Agreement.  No prior waiver by Lender, nor any course of dealing
        between Lender and Borrower, or between Lender and any Grantor, shall
        constitute a waiver of any Lender's rights or of any obligations of
        Borrower or of any Grantor as to any future transactions.  Whenever the 
        consent of Lender is required under this Agreement, the granting of
        such consent by Lender in any instance shall not constitute continuing
        consent in subsequent instances where such consent is required, and in
        all cases such consent may be granted or withheld in the sole
        discretion of Lender.
                
                

                   
<PAGE>   7
                                                   
09-06-1996                 BUSINESS LOAN AGREEMENT            Page 5
Loan No 133802163                 (Continued)      
================================================================================

BORROWER ACKNOWLEDGES HAVING READ ALL THE PROVISIONS OF THIS BUSINESS LOAN
AGREEMENT, AND BORROWER AGREES TO ITS TERMS.  THIS AGREEMENT IS DATED AS OF
SEPTEMBER 6, 1996.

BORROWER:

Brandon Diagnostic Center Ltd.

By: /s/ Curtis L. Alliston
   -----------------------------------------------------------
   Alpha Associates, Inc., General Partner, Curtis L. Alliston

LENDER:

SOUTH HILLSBOROUGH COMMUNITY BANK

By: /s/
   -----------------------------------------------------------
   Authorized Officer

================================================================================