Document:

EMPLOYMENT AGREEMENT

PARTIES:

                  Quantech Ltd.                             (the "Company")
                  1419 Energy Park Drive
                  St. Paul, Minnesota  55108

                  Thomas R. Witty, Ph.D.                    (the "Employee")
                  3414 Kenilworth Lane
                  Santa Cruz, California  96065

DATE:             October 1, 1997

RECITALS:

                  A. The Company is engaged in the business of developing and
commercializing certain patents, technology, associated proprietary data and
existing operating prototypes related to medical diagnostics based upon Surface
Plasmon Resonance.

                  B. The Employee seeks to be employed, and the Company seeks to
employ, Employee under the terms of this Agreement.

                  C. The Employee agrees that as a condition to employment with
the Company the Employee will abide by the terms of this Agreement.

                  D. The Employee desires to be employed by the Company in a
capacity in which he may contribute to, or receive confidential information, and
acknowledges that the Company will suffer irreparable harm if Employee uses
confidential information outside his employment or makes any unauthorized
disclosure of such confidential information to any third party or uses such
confidential information wrongfully or in competition with the Company.

                  E. Employee further recognizes that execution of this
Agreement is an express condition of employment.

AGREEMENTS:

                  NOW, THEREFORE, in consideration of the mutual promises herein
contained, and other benefits now or hereafter paid or made available to
Employee by the Company, the parties hereby agree as follows:

1. Employment at Will. The Company hereby employs Employee as Vice President -
Research and Development of the Company until such time as the Company or

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Employee decides to terminate Employee's employment. Nothing in this Agreement
shall be construed to create an employment relationship other than one that is
at will or constituting a commitment, guaranty, agreement, or understanding of
any kind or nature that Quantech shall continue to employ Employee, nor shall
this letter affect in any way the right of Quantech to terminate Employee's
employment at any time and for any reason.

2. Duties and Supervision. During the term of this Agreement, Employee agrees to
devote best efforts to the business and affairs of Employer and agrees to
perform such reasonable services and duties as may, from time to time, be
assigned to him by the Chief Executive Officer, President or Chief Operating
Officer of the Company relating to the research and development of the Company's
products. While employee is employed by the Company, Employee will not perform
services for any other person, firm or corporation, either as an employee or as
an agent or other independent contractor without the express consent of the
Chief Executive Officer of the Company. Employee agrees to comply in ever
respect with the general standards and policies of the Company as in effect from
time to time during Employee's employment, all of which Employer reserves the
right to change in its sole discretion.

 3.  Compensation.

                  A. Base Salary. The Company shall pay Employee an initial
annual salary of $125,000 (the "Base Salary"), payable in accordance with the
Company's normal payroll practices in effect from time to time beginning as of
the date this Agreement. The Employee's compensation shall be subject to
discretionary upward adjustments by the Company's Chief Executive Officer.

                  B. Bonus. The Company shall establish a bonus plan consistent
with Company policy whereby Employee shall be entitle to receive bonuses in cash
and/or securities of the Company as determined by the Company's Board of
Directors or its compensation committee.

4.       Other Employee Benefits.

                  A. Benefits. For so long as Employee remains employed by the
Company, Employer agrees to obtain and maintain for the benefit of Employee,
health insurance benefits of the same nature as the Company maintains from time
to time in favor of its employees in general and to provide such other benefits
as the Company announces from time to time to apply to its employees in general.

                  B. Rental Car, Housing and Plane fare. Until such time as
Employee's permanent residence is within a reasonable commute by automobile to
a Company facility, the Company will reimburse Employee for his rental car
expense, accommodation rental expense and plane fare for himself, and once a
month for a companion, to the Company.

                  C. Reimbursement of Expenses. The Company will reimburse
Employee for all of Employees out-of-pocket expenses related to Company
business, provided, however, that any such single expense in excess of $500 will
be approved by the Company's Chief Operating Officer.

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                  D. Vacation. Employee shall be entitled to three (3) weeks of
vacation each year.

                  E. Options. Employee will be provided a five year
non-qualified stock option to purchase up to 300,000 shares of Quantech Common
Stock at $.25 per share which option shall fully-vest over a two year term
(100,000 shares immediately, 100,000 shares after one year of employment and
100,000 shares after two years of employment) and contain such other general
terms as those provided other Quantech employees.

5.       Termination of Employment.

                  Employee shall not be entitled to any payments upon
termination of employment, except any salary or bonuses that have accrued to
Employee through the date of such termination shall be paid by the Company, and
further provided that Employee shall also be entitled to a lump-sum payment of
six (6) month's base salary if termination of Employment is a result of a sale
of substantially all of the assets of the Company or a change in the control of
more than 50% of the Company's Common Stock pursuant to a single transaction or
a series of transactions by the same acquiring party.

6.  General Provisions.

                  A. Injunctive Relief. In addition to any other relief afforded
by law, the Company shall have the right to enforce the covenants contained in
this Agreement by seeking injunctive relief against Employee and any other
person concerned thereby, it being understood that both damages and injunctive
relief shall be proper modes of relief and are not to be considered as
alternative remedies.

                  B. Severability and Interpretation. In the event that a
provision of this Agreement is held invalid by a court of competent
jurisdiction, the remaining provisions shall nonetheless be enforceable
according to their terms. Further, in the event that any provision is held to be
overbroad as written, such provision shall be deemed amended to narrow its
application to the extent necessary to make the provision enforceable according
to applicable law and shall be enforced as amended.

                  C. Entire Agreement. This Agreement constitutes the entire
agreement between the parties and supersedes any and all prior oral or written
understandings between the parties relating to the subject matter hereof, except
for the Confidentiality and Invention Agreement entered into between the Company
and Employee of even date with this Agreement.

                  D. Modification and Waiver. No purported amendment,
modification or waiver of any provision hereof shall be binding unless set forth
in a written document signed by all parties (in the case of amendments or
modifications) or by the party to be charged thereby (in the case of waivers).
Any waiver shall be limited to the provisions hereof and the circumstances or
event specifically made subject thereto, and shall not be deemed a waiver of any
other term hereof or of the same circumstance or event upon any reoccurrence
thereof.

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                  E. Assignment. This Agreement shall be binding on Employee's
heirs, assigns and legal representatives and may be transferred by the Company
to its successors and assigns.

                  F. Governing Law. This Agreement is governed by and shall be
construed in accordance with the laws of the State of Minnesota.

                  G. Arbitration. All disputes arising under this Agreement
shall be submitted for arbitration in the state of Minnesota, the United States
of America.

                  IN WITNESS WHEREOF, the parties hereto have executed this
Agreement the day and year first above written.

                                     "Company"
                                     Quantech Ltd.

                                     ____________________________
                                     Gregory G. Freitag, COO

                                     "Employee"

                                     ____________________________
                                     Thomas R. Witty, Ph.D.

                                       4M A N A G E M E N T   A G R E E M E N T
                     ---------------------------------------

OWNER:       Nooney Realty Trust, Inc.

AGENT:       Maxus Properties, Inc.

PREMISES:    Franklin Park Distribution Center
             3465 N. Powell Ave.
             Powell, Illinois 60131

BEGINNING:   November 10, 1999

ENDING:      November 10, 2004

<PAGE>

   IN CONSIDERATION of the covenants herein contained, Nooney Realty Trust, Inc.
(hereinafter  called "Owner"),  and Maxus Properties,  Inc.  (hereinafter called
"Agent"), agree as follows:

   1. The Owner  hereby  employs  the Agent  exclusively  to rent and manage the
property known as Franklin Park Distribution Center (hereinafter the "Premises")
upon the terms and  conditions  hereinafter  set  forth,  for a term of five (5)
years  beginning  on November 10,  1999,  and ending on November  10, 2004,  and
thereafter  for yearly  periods  from time to time,  unless on or before 60 days
prior to the date last  above  mentioned  or on or  before 60 days  prior to the
expiration  of any such  renewal  period,  either  party hereto shall notify the
other in writing that it elects to terminate this Agreement,  in which case this
Agreement  shall be thereby  terminated on said last mentioned  date.  (See also
Paragraph 6.3 below.)

   2. THE AGENT AGREES:

   2.1 To accept the management of the Premises,  to the extent, for the period,
and upon the terms  herein  provided  and agrees to furnish the  services of its
organization for the rental operation and management of the Premises.

   2.2 To prepare a monthly  statement  of  receipts  and  disbursements  and to
remit,  on a monthly  basis,  the net cash flow  generated by the Premises after
payment  of  all  operating  expenses,  debt  service  and  escrow  payments  if
applicable, to the following party:

                  Nooney Realty Trust, Inc.
                  c/o David L. Johnson
                  P.O. Box 26730
                  Kansas City, Missouri  64196

In the  event  total  monthly  disbursements  are in  excess  of  total  monthly
receipts,  the Owner  shall  promptly  provide  funds to cover such  shortfalls.
Nothing  contained  herein shall  obligate the Agent to advance its own funds on
behalf of the Owner to cover any shortfalls.

   2.3 To cause all employees of the Agent who handle or are responsible for the
safekeeping  of any monies of the Owner to be  covered by a fidelity  bond in an
amount and with a company determined by the Agent.

   3. THE OWNER AGREES:

   To give the Agent the following authority and powers (all or any of which may
be  exercised  in the name of the Owner) and  agrees to assume all  expenses  in
connection therewith.

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<PAGE>
   3.1 To advertise the Premises or any part  thereof;  to display signs thereon
and to  rent  the  same;  to  cause  references  of  prospective  tenants  to be
investigated;  to sign  leases  for terms not in excess of one year and to renew
and/or cancel the existing leases and prepare and execute the new leases without
additional charge to the Owner;  provided;  however,  that the Agent may collect
from tenant all or any of the following:  a late rent  administrative  charge, a
non-negotiable  check  charge,  credit  report fee, a subleasing  administrative
charge and/or  broker's  commission and need not account for such charges and/or
commission  to the  Owner;  to  terminate  tenancies  and to sign and serve such
notices as are deemed needful by the Agent;  to institute and prosecute  actions
to oust  tenants  and to  recover  possession  of the  Premises;  to sue for and
recover  rent;  and, when  expedient,  to settle,  compromise,  and release such
actions or suits, or reinstate such  tenancies.  Owner shall reimburse Agent for
all expenses of litigation  including  attorneys'  fees,  filing fees, and court
costs which Agent does not recover from  tenants.  Agent may select the attorney
of its choice to handle such litigation.

   3.2 To hire, discharge, and pay all managers,  engineers,  janitors and other
employees;  to make or cause to be made all  ordinary  repairs and  replacements
necessary  to  preserve  the  Premises  in its  present  condition  and  for the
operating  efficiency thereof and all alterations  required to comply with lease
requirements,  and to do decorating on the Premises;  to negotiate contracts for
nonrecurring  items not exceeding  $5,000 and to enter into  agreements  for all
necessary repairs,  maintenance,  minor alterations and utility services; and to
purchase  supplies  and pay bills.  Agent shall secure the approval of the Owner
for items,  except monthly or recurring  operating charges and emergency repairs
in excess of the  maximum,  if, in the  opinion of the Agent,  such  repairs are
necessary  to protect the  property  from damage or to maintain  services to the
tenants as called for by their tenancy.

   3.3 To collect rents and/or  assessments and other items due or to become due
and give receipts  therefor and to deposit all funds collected  hereunder in the
Agent's custodial account.

   3.4 Agent agrees to collect all tenant  security  deposits.  Owner  instructs
Agent to deposit all security deposits in the general operating  accounts of the
property.  Agent is not to  segregate  the  security  deposits  into a  separate
account or into an escrow account.

   3.5 To execute and file all returns and other  instruments and do and perform
all acts required of the Owner as an employer with respect to the Premises under
the Federal Insurance  Contributions Acts, the Federal  Unemployment Tax Act and
Subtitle C of the  Internal  Revenue  Code of 1954 with respect to wages paid by
the Agent on behalf of the Owner and under any similar federal and state law now
or hereafter in force (and in connection therewith the Owner agrees upon request
to promptly  execute and deliver to the Agent all necessary  powers of attorney,
notices of appointment, and the like).

   3.6 The Agent  shall not be  required  to advance  any monies for the care or
management  of said  property,  and the  Owner  agrees  to  advance  all  monies
necessary therefor.  If the Agent shall elect to advance any money in connection
with the property,  the Owner agrees to reimburse the Agent forthwith and hereby
authorizes the Agent to deduct such advances from any monies due the Owner.  The
Agent,  shall, upon instruction from the Owner,  impound reserves each month for
the payment of real estate taxes, insurance, or any other special expenditure.

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   4. THE OWNER FURTHER AGREES:

   4.1 To  indemnify,  defend  and save the  Agent  harmless  from all  suits in
connection  with the  Premises  and from  liability  for damage to property  and
injuries to or death of any employee or other person whomsoever, and to carry at
his (its) own expense  public  liability,  elevator  liability (if elevators are
part of the equipment of the  Premises),  and workmen's  compensation  insurance
naming  the Owner and  Agent,  adequate  to  protect  their  interests  in form,
substance,  and amounts reasonably  satisfactory to the Agent, and to furnish to
the Agent  certificates  evidencing the existence of such insurance.  Unless the
Owner shall provide such insurance and furnish such  certificate  within 30 days
from the date of this  Agreement,  the Agent may, but shall not be obligated to,
place said  insurance  and charge the cost  thereof to the account of the Owner.
All such  insurance  policies  shall provide that the Agent shall receive thirty
(30) days' written notice prior to cancellation of the policy.

   4.2 To pay all expenses incurred by the Agent, including, but not limited to,
reasonable  attorneys'  fees and Agent's costs and time in  connection  with any
claim,  proceeding,  or suit involving an alleged  violation by the Agent or the
Owner, or both, of any law pertaining to fair employment, fair credit reporting,
environmental protection,  rent control, taxes, or fair housing,  including, but
not limited to, any law prohibiting,  or making illegal,  discrimination  on the
basis of race,  sex,  creed,  color,  religion,  national  origin,  or mental or
physical handicap; provided, however, that the Owner shall not be responsible to
the Agent for any such expenses in the event the Agent is finally adjudicated to
have personally,  and not in a representative  capacity,  violated any such law.
Nothing contained herein shall obligate the Agent to employ counsel to represent
the  Owner in any such  proceeding  or suit,  and the  Owner may elect to employ
counsel to represent the Owner in any such  proceeding  or suit.  The Owner also
agrees to pay  reasonable  expenses (or an  apportioned  amount of such expenses
where other  employers of Agent also benefit from the  expenditure)  incurred by
the Agent in obtaining legal advice regarding  compliance with any law affecting
the premises or activities related thereto.

   4.3 To  indemnify,  defend,  and save the  Agent  harmless  from all  claims,
investigations, and suits, or from actions or failures to act of the Owner, with
respect to any alleged or actual  violation of state or federal  labor laws,  it
being  expressly  agreed and understood that as between the Owner and the Agent,
all persons employed in connection with the Premises are employees of the Owner,
not the Agent.  However,  it shall be the  responsibility of the Agent to comply
with all applicable  state or federal labor laws. The Owner's  obligation  under
this  paragraph  4.3 shall include the payment of all  settlements,  judgements,
damages,  liquidated damages,  penalties,  forfeitures,  back pay awards,  court
costs, litigation expense, and attorneys' fees.

   4.4 To give adequate advance written notice to the Agent if the Owner desires
that the Agent make payment, out of the proceeds from the premises,  or mortgage
indebtedness,  general taxes, special assessments, or fire, steam boiler, or any
other insurance premiums. In no event shall the Agent be required to advance its
own money in payment of any such indebtedness, taxes, assessments, or premiums.

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<PAGE>

   5. THE OWNER AGREES TO PAY THE AGENT EACH MONTH:

   5.1 MANAGEMENT:  Owner agrees to pay Agent for the ordinary management of the
Premises Two and Seven Tenths  Percent (2.7%) of the monthly gross receipts from
the operation of the Premises  during the period this Agreement  remains in full
force and effect.  Gross receipts are all amounts received from the operation of
the Premises  including,  but not limited to,  rents,  parking  fees,  deposits,
laundry income and fees.

   5.2 OTHER ITEMS OF MUTUAL  AGREEMENT:  In the event Owner  requests and Agent
agrees to perform  services  outside  the scope of  ordinary  management  of the
Premises,  the  parties  will  agree to a fee and  payment  structure  for these
services prior to commencement of the work.

   6. IT IS MUTUALLY AGREED THAT:

   6.1 The Owner  expressly  withholds  from the Agent any power or authority to
make  any  structural  changes  in any  building  or to  make  any  other  major
alterations or additions in or to any such building or equipment therein,  or to
incur any expense  chargeable to Owner other than expenses related to exercising
the express powers above vested in Agent without the prior written  direction of
an authorized  representative  of Owner.  Agent is granted the authority to make
structural  changes or major alterations if such actions are required because of
danger to life or which  are  immediately  necessary  for the  preservation  and
safety of the Premises or the safety of the occupants thereof or are required to
avoid the suspension of any necessary service to the Premises.

   6.2 The Agent does not assume and is given no  responsibility  for compliance
of any building on the Premises or any equipment  therein with the  requirements
of any statute,  ordinance, law or regulation of any governmental body or of any
public authority or official thereof having  jurisdiction,  except to notify the
Owner  promptly  or  forward to the Owner  promptly  any  complaints,  warnings,
notices,  or  summonses  received  by it  relating  to such  matters.  The Owner
represents  that to the  best of his  (its)  knowledge  the  Premises  and  such
equipment  comply  with all such  requirements  and  authorizes  the Agent,  its
representatives,  servants, and employees,  of and from all loss, cost, expense,
and liability  whatsoever  which may be imposed on them or any of them by reason
of  any  present  or  future  violation  or  alleged  violation  of  such  laws,
ordinances, statutes, or regulations.

   6.3 In the event it is alleged or charged  that any  building on the Premises
or any equipment  therein or any act or failure to act by the Owner with respect
to the Premises or the sale, rental or other disposition thereof fails to comply
with,  or is in  violation  of,  any of  the  requirements  of a  constitutional
provision, statute, ordinance, law or regulation of any governmental body or any
order or ruling of any public  authority or official  thereof having or claiming
to have  jurisdiction  thereover,  and  the  Agent,  in its  sole  and  absolute
discretion,  considers  that the action or position  of the Owner or  registered
managing  Agent with  respect  thereto may result in damage or  liability to the
Agent,  the Agent shall have the right to cancel this  Agreement  at any time by
written notice to the Owner of its election so to do, which  cancellation  shall
be  effective  upon the  service  of such  notice.  Such  notice  may be  served
personally  or by  registered  mail,  on or to the person  named to receive  the
Agent's monthly statement at the address  designated for such person as provided
in  Paragraph  2.2  above,  and if  service by mail shall be deemed to have been
served when deposited in the U.S. Mail. Such

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<PAGE>

cancellation  shall not release the
indemnities  of the Owner set forth in  Paragraph  4 and 6.2 above and shall not
terminate any liability or obligation of the Owner to the Agent for any payment,
reimbursement,  or  other  sum of  money  then  due  and  payable  to the  Agent
hereunder.

   7. This  Agreement  may be  canceled  by Owner  before the  termination  date
specified in Paragraph 1 on not less than 60 days' prior  written  notice to the
Agent.

   8. The Owner  shall pay or  reimburse  the Agent for any sums of money due it
under  this   Agreement   for  service  for   actions   prior  to   termination,
notwithstanding  any  termination  of this  Agreement.  All  provisions  of this
Agreement  that  require the Owner to have insured or to defend,  reimburse,  or
indemnify the Agent  (including,  but not limited to,  Paragraphs  4.1, 4.2, and
4.3) shall survive any termination  and, if Agent is or becomes  involved in any
proceeding  or  litigation  by reason of having  been the  Owner's  agent,  such
provisions  shall apply as if this Agreement  were still in effect.  The parties
understand  and agree that the Agent may  withhold  funds for  thirty  (30) days
after the end of the month in which the  Agreement  is  terminated  to pay bills
previously incurred but not yet invoiced and to close accounts.

   This Agreement  shall be binding upon the successors and assigns of the Agent
and their  heirs,  administrators,  executors,  successors,  and  assigns of the
Owner.

   IN WITNESS  THEREOF,  the parties hereto have affixed or caused to be affixed
their respective signatures effective this 10th day of November, 1999.

                                    OWNER:  Nooney Realty Trust, Inc.

                                            By:/s/   Daniel W. Pishny
                                                     Daniel W. Pishny
                                                     President and Trustee

                                    AGENT:  Maxus Properties, Inc.

                                            By:/s/   John W. Alvey
                                                     John W. Alvey
                                                     Vice President and Chief
                                                     Financial Officer

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<PAGE>

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