Document:

SUPPLEMENTARY AGREEMENT
                                       FOR
                            STOCK PURCHASE AGREEMENT

WHEREAS Guilian li (ID:110103196312121002), and Ziyang Zong
(ID:132429197110271811) (the "Purchaser") and Kiwa Bio-Tech Products Group
Corporation (the "Company") entered into the Stock Purchase Agreement (the
"Agreement") as of March 10, 2006, pursuant to which the Purchasers shall
deliver to the Company 30% of total Purchase Price of RMB6,000,000
(approximately $750,000) in 10 days from the effective date of this Agreement,
and the balance shall be paid to the Company in 20 days from the effective date
of this Agreement, and immediately upon full payment, the Company shall deliver
to the Purchasers certificates evidencing the Shares issued in the name of the
Purchasers.

And whereas as of April 13, 2006, the Purchasers actually delivered part of
purchase price, amounted to $350,000, and the balance is still outstanding, it
is agreed to sign this supplementary agreement to confirm the term as follows:

The Purchasers agree to settle the balance of purchase price under the Agreement
not later than April 30, 2006, and the Company agrees such amendment of payment
term.

All other terms of the Agreement are enforceable for both of the Purchasers and
the Company.

PURCHASERS:
BY: Guilian li and Ziyang Zong
    ---------------------------------
Title:

The Company:
BY: Wei Li
    ---------------------------------
Title: Chairman and CEO

April 13, 2006Exhibit
      10.1

    Lothian
      Oil Inc.

    500
      Fifth Avenue, Suite 2600

    New
      York, New York 10110

    

    April
      11,
      2006

    

    United
      Heritage Corporation

    405
      North
      Marienfeld, Suite 200

    Midland,
      Texas 79701

    

    Ladies
      and Gentlemen:

    

    Reference
      is made to that certain Merger Agreement and Plan of Reorganization (the
“Agreement”)
      made
      and entered into as of February 22, 2006 by and among United Heritage
      Corporation, a Utah corporation (“United”)
      and
      Lothian Oil Inc., a Delaware corporation (“Lothian”).
      Capitalized terms used but not defined herein have the respective meanings
      ascribed to them in the Agreement.

    

    Lothian
      and United hereby agree that the Agreement is hereby amended as
      follows:

    

    1.    Section
      1.6(g) of the Agreement is deleted in its entirety and replaced with the
      following:

     

    “(g)
       United
      Warrants. At the Effective Time, each holder of United Common Stock as of a
      record date to be fixed by United’s board of directors in accordance with
      applicable law or regulation (with the exception of Lothian) will receive a
      stock purchase warrant to purchase one share of United Common Stock for each
      share of United Common Stock held by such United shareholder. Each such warrant
      issued pursuant to this Section 1.6(g) will have a term of five years and an
      exercise price of $3.00 per share.” 

    

    Except
      as
      specifically amended hereby, the terms of the Agreement shall remain in full
      force and effect. This letter agreement shall be governed by and construed
      in
      accordance with the Laws of the State of Delaware, without giving effect to
      any
      choice of law or conflict of law provision or rule that would cause the
      application of the Laws of any jurisdiction other than the State of Delaware.
      

    [Signature
      page follows.]

     

    
      
        
        

      

      
        
        

        
          

        

      

      
        
        

      

    

    Please
      indicate your acceptance of and agreement to the foregoing by signing and
      returning to me a copy of this letter, which may be signed in
      counterparts.

     

     

    
      	 	Very truly yours, 
	 	 	 
	 	Lothian
              Oil
              Inc.
	 
 	 
 	 
 
	 	By:  	/s/ Bruce
              Ransom
	 	
               

              Name:  

              Title: 

            	
              

               Bruce
                Ransom

              Chief
                Executive Officer

            
	 	 

    

     

    
      	 	 	 	 	 
	By:	/s/ C.
              Scott
              Wilson	 	 	 
	
               

              Name:

              Title: 

            	
              

              C.
                Scott Wilson

              Chief
                Executive OfficerSTATSURE DIAGNOSTIC SYSTEMS, INC.

                                  EXHIBIT 4.28

                             AUDIT COMMITTEE CHARTER

ORGANIZATION

There  shall be a  committee  appointed  by the Board of  Directors  of StatSure
Diagnostic Systems,  Inc., a Delaware corporation (the "Corporation") of members
of the Board of  Directors  all of which shall be  non-employee  directors to be
known as the audit committee (the "Committee").  The number of Committee members
shall  be  as  determined  by  the  Board  of  Directors   consistent  with  the
Corporation's certificate of incorporation and by-laws as amended. The Committee
shall be composed of directors  who are free of any  relationship  that,  in the
opinion  of the Board of  Directors,  would  interfere  with their  exercise  of
independent  judgment as a Committee member.  All members of the Committee shall
have a working  familiarity  with basic finance and accounting  practices and at
least one member of the  Committee  shall be a "financial  expert" as defined by
the Securities  and Exchange  Commission in its rules.  The Committee  Chair and
members shall be designated annually by a majority of the full Board, and may be
removed,  at any time,  with or without cause,  by a majority of the full Board.
Vacancies shall be filled by a majority of the full Board.

STATEMENT OF PURPOSE

The Committee  shall provide  assistance to the Board of Directors in fulfilling
its  responsibility to the shareholders,  potential  shareholders and investment
community  relating  to  corporate   accounting,   reporting  practices  of  the
Corporation,  the  quality  and  integrity  of  the  financial  reports  of  the
Corporation  and  the   Corporation's   compliance  with  legal  and  regulatory
requirements. In so doing, it is the responsibility of the Committee to maintain
free and open  means of  communication  among  the  directors,  the  independent
auditors and the financial management of the Corporation.

RESPONSIBILITIES

In carrying out its  responsibilities,  the Committee  believes its policies and
procedures should remain flexible, in order to best react to changing conditions
and to ensure to the directors and  shareholders  that the corporate  accounting
and  reporting   practices  of  the  Corporation  are  in  accordance  with  all
requirements   and  are  of  the  highest   quality.   In  carrying   out  these
responsibilities, the Committee will:

         Serve  as  an   independent   and   objective   party  to  monitor  the
         Corporation's  financial  reporting process and internal control system
         and complaints or concerns relating thereto.

         Recommend, for shareholder approval, the independent auditor to examine
         the  Corporation's  accounts,  controls and financial  statements;  the
         Committee shall have the sole authority and  responsibility  to select,
         evaluate  and, if  necessary,  replace  the  independent  auditor;  the
         Committee shall have the sole authority to approve all audit engagement
         fees and  terms;  the  Committee,  or a member of the  Committee,  must
         pre-approve  any non-audit  service  provided to the Corporation by the
         Corporation's independent auditor.

         Meet with the  independent  auditors and  financial  management  of the
         Corporation  to review the scope of the proposed  audit for the current
         year and the audit  procedures  to be utilized,  and at the  conclusion
         thereof review such audit, including any comments or recommendations of
         the independent auditors.

<PAGE>

         Obtain and review, at least annually,  a formal written report from the
         independent   auditor   setting  forth  its  internal   quality-control
         procedures  and material  issues  raised in the prior five years by its
         internal  quality-control  reviews and their resolution;  the Committee
         will review at least annually all relationships between the independent
         auditor and the Corporation.

         Ensure that the lead audit partner assigned by the independent  auditor
         as well as the audit partner responsible for reviewing the audit of the
         Corporation's  financial  statements  be  changed  at least  every five
         years.

         Review and appraise the audit  efforts of  independent  auditors of the
         Corporation  and, where  appropriate,  recommend the replacement of the
         independent auditors.

         Consider   and  approve,   if   appropriate,   major   changes  to  the
         Corporation's  accounting  principles and practices as suggested by the
         independent auditors or management.

         Establish regular and separate systems of reporting to the Committee by
         management  and the  independent  auditors  regarding  any  significant
         judgments made in management's  preparation of the financial statements
         and  the  view  of each as to  appropriateness  of such  judgments  and
         additional items as required under the  Sarbanes-Oxley  Act,  including
         critical accounting policies.

         Review with the independent auditors and financial accounting personnel
         the adequacy and effectiveness of the accounting and financial controls
         of the Corporation,  and elicit any recommendations for the improvement
         of such internal  control  procedures or particular  areas where new or
         more detailed controls or procedures are desirable; particular emphasis
         should be given to the adequacy of such internal controls to assess and
         manage financial risk exposure and to expose any payments, transactions
         or procedures that might be deemed illegal or otherwise improper.

         Review the  financial  statements  contained  in the annual  report and
         quarterly  report to  shareholders  with management and the independent
         auditors to determine that the independent  auditors are satisfied with
         the disclosure and content of the financial  statements to be presented
         to the shareholders.

         Prepare and publish an annual  Committee  report in the proxy statement
         of the Corporation.

         Review with management of the  Corporation  any financial  information,
         earnings press releases and earnings guidance filed with the Securities
         and Exchange  Commission or disseminated  to the public,  including any
         certification,  report,  opinion or review  rendered by the independent
         auditors.

         Provide  sufficient  opportunity for the  independent  auditors to meet
         with  the  members  of the  Committee  without  members  of  management
         present.  Among the items to be  discussed  in these  meetings  are the
         independent  auditors'  evaluation  of  the  Corporation's   financial,
         accounting  and  auditing  personnel,  and  the  cooperation  that  the
         independent auditors received during the course of the audit.

         Establish  procedures for receiving and treating complaints received by
         the Corporation regarding accounting,  internal accounting controls and
         auditing  matters,   and  the  confidential   anonymous  submission  by
         employees of concerns  regarding  questionable  accounting  or auditing
         matters.

         Submit the minutes of all meetings of the  Committee to, or discuss the
         matters  discussed  at  each  Committee  meeting  with,  the  Board  of
         Directors.

         Investigate any matter brought to its attention within the scope of its
         duties,  with the power to retain outside advisors for this purpose if,
         in its judgment, appropriate.

<PAGE>

COMMITTEE PERFORMANCE EVALUATION

The  Committee  shall  annually  conduct an  evaluation  of its  performance  in
fulfilling its responsibilities and meeting its goals, as outlined above.

MEETINGS

A majority of Committee members shall constitute a quorum for the transaction of
business.  The  action of a  majority  of those  present at a meeting at which a
quorum is attained shall be the act of the Committee. The Committee may delegate
matters within its  responsibility  to subcommittees  composed of certain of its
members.  The Committee shall meet in executive  session without the presence of
any members of management as often as it deems appropriate.  The Committee shall
meet as required,  keep a record of its  proceedings,  if appropriate or needed,
and report thereon from time to time to the Board of Directors.

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