Document:

Filed by Automated Filing Services Inc. (604) 609-0244 - Imvision Therapeutic Inc. - Exhibit 10.15

EXHIBIT 10.15

ImVisioN                       

	  	Ansprech- 	  
	Prof. Dr. Horst Rose 	partner: 	Martin Steiner 
	Am Vorwerk 7 	fon: 	(0511) 53 88 96-76 
	31303 Burgdorft 	fax: 	(0511) 53 88 96-66 
	  	e-mail: 	m.steiner@imvision-therapeutics.com 

Hannover, 17. August 2006

Amendment to Employment Agreement

 

Due to the subscription of Prof. Dr. Horst Rose to purchase
1.300.000 shares of ImVisioN Therapeutics Inc. at a purchase price of $ 0,001
per share in the course of a private placement completed on June 30th
2006, ImVisioN GmbH and Dr. Martin Steiner agree to amend the employment
agreement dated March 30th 2005 as follows:

Article 6 Paragraph 1 shall be amended
and restated to read as follows:

		
      “(1) 
	
      The General Manager shall receive for its activity as of
      April 1, 2005 an annual gross salary of EURO 120,000.00, paid in 12
      non-cash gross monthly installments, amount- ing to EURO 10,000.00, by
      deducting all legal and other taxes that must be withheld or paid, with a
      due date for payment at month end. With respect to any activities per-
      formed by the General Manager before April 1, 2005, there is no right to
      payment of a fee or refund of costs from the Company. This provision shall
      not affect any existing rights against third parties."

Appendix 1 of the Agreement shall be
deleted.

The employment agreement will continue in full force and effect,
  without amendment except as expressly provided herein. With their signature
  below, the Parties agree to this Amendment effective on June 30th 2006:

 

	/s/ Horst Rose
      	 	/s/
      Martin Steiner 
	  	 	  
	Prof. Horst Rose 	 	Dr. Martin Steiner 
	  	 	Geschäftsführer/CEO 
	  	 	ImVisioN GmbHFiled by Automated Filing Services Inc. (604) 609-0244 - Lexington Energy Services Inc. - Exhibit 10.17

	 
	LARICINA
      
	E N E R G Y  L T D.
      

August 2, 2006

Lexcore Energy Services Ltd. 
P.O. Box 1000 
Brooks,
AB
T1R 1B8

Attention:            
Mr. Doug Chernesky 

Dear Mr. Chernesky,

	Re: 	2006 - 2007 Core Hole Delineation Project – Core Rig
      Contract 

At the meeting between Lexcore Energy Services Inc. (Lexcore).,
a subsidiary of Lexington Energy Services Inc., RCS Energy Services Ltd. (RCS)
and Laricina Energy Ltd. (LEL) at Calgary, Alberta on July 28, 2006, a verbal
agreement was reached to move forward with negotiations and contracting of two
(2) coring/drilling rigs to LEL for the 2006 – 2007 Core Hole Delineation
Project, subject to negotiations, and contract acceptance. It is understood that
Lexcore will cease negotiations with all other operators pertaining to the
aforementioned rigs while negotiations with LEL are ongoing.

The terms of the agreement are understood to be as follows:

	1. 	
      Safety will be of the highest concern. All
      equipment must be certified appropriately and the documentation available
      for inspection when requested by a Regulatory Officer or LEL
      representative. All personnel must have the required certification for rig
      crews. The current copy of Lexcore’s Health, Safety, and Environment
      program (policies and procedures) will be submitted immediately to LEL
      with a final draft to be submitted no later than the close of business on
      August 31, 2006 for review and file.

	 	 
	2. 	
      The 2006 – 2007 Core Hole Delineation project will
      consist of an estimated 58 holes spread over three distinct project areas.
      The “Poplar” area is situated near Fort McMurray, Alberta and will consist
      of approximately 27 holes. The “Thombury” area is situated near Mariana
      Lakes, Alberta and will consist of approximately 10 holes. The “Germain”
      area is situated near Wabasca, Alberta and will consist of approximately
      21 holes. The projected number of holes may increase, and is not expected
      to decrease. The start date of the project is weather dependent since all
      three areas are winter access only, but is estimated for early December
      2006.

	 	 
	3. 	
      In each of the areas, food and accommodations will be
      provided by LEL.

	 	 
	4. 	
      As discussed, the coring rigs will be fully tested and
      will have each drilled a minimum of six (6) shallow gas wells before the
      projected start date of the 2006 – 2007 Core Hole Delineation project.
      Both rigs will mobilize when requested and arrive with the agreed support
      services, ready to drill.

	Page 2 	August 2, 2006 

	5. 	
      Negotiations between Lexcore and LEL regarding services
      and rates will commence promptly with strong consideration give to the
      expectations contained within the Request for Proposal which was submitted
      by RCS on behalf of LEL on June 16, 2006 and the subsequent bid by Lexcore
      on July 6, 2006, and the information contained within each. In these
      discussions, a contract will be formed detailing the services that will be
      provided by Lexcore and the compensation provided by LEL. It is understood
      that products and services such as cement, casing, water truck, vacuum
      truck, and drilling fluids are outside the scope of the negotiations
      whereas other products and services such as drill bits, front-end loader,
      core box, transportation of core to a central location within the project
      area, core PVC, and supplies, among others, will be
  negotiated.

 

Yours truly,

LARICINA ENERGY LTD.

 

Dave Theriault
VP Operations and COO

 

Signed this   2   day
of       August     
, 2006

	/s/ Dave Theriault
    	 	/s/
      Doug Chernesky 
	Dave Theriault 	 	Doug Chernesky 
	VP Operations & COO 	 	VP Operations 
	Laricina Energy Ltd. 	 	Lexcore Energy Services Inc.Filed by Automated Filing Services Inc. (604) 609-0244 - Lexington Energy Services Inc. - Exhibit

Employment Agreement

THIS EMPLOYMENT AGREEMENT (the “Agreement”) is effective
as of the 17th day of May, 2006.

BETWEEN:

LEXCORE SERVICES INC.
Box
1000
Brooks, Alberta T1R 1B8

(the “Employer”) 

AND:

DOUG CHERNESKY
22 – 10030
Oakmoor Way, SW 
Calgary, Alberta T2V 4S8

(the “Executive”)

WHEREAS:

1. The Employer is engaged in the
oilfield services industry; and

2. The Employer and the Executive have
agreed to enter into an employment relationship for their mutual benefit;

THIS AGREEMENT WITNESSES that the parties have agreed
that the terms and conditions of the relationship shall be as follows:

1.           Duties

              The
Employer appoints the Executive to undertake the duties and exercise the powers
as Vice President of Operations of the Employer, as may be requested of the
Executive by the Employer, and in the other offices to which the Executive may
be appointed by the parent and subsidiary companies of the Employer, and the
Executive accepts the office, on the terms and conditions set forth in this
agreement.

2.           Term

              The
Executive’s appointment shall commence with effect from May 17, 2006, and shall
continue until terminated in accordance with the provisions of clause 12 of this
agreement.

3.           Compensation

              The
fixed remuneration of the Executive for his or her services shall be at the
gross rate of CAD $225,000.00 per annum, commencing the 1st day of
May, 2006. The Employer will take source deductions of all statutorily required
items. The Executive will be paid on a monthly basis.

              In
addition, as compensation, the Executive will receive 200,000 options (the
“Options”) to purchase shares of Lexington Energy Services Inc. (“Lexington”),
the Employer’s parent corporation. The Options are exercisable at a price of US
$0.85 per share. The Options shall vest on May 17, 2006, and are exercisable for
a period of two years from the date of this agreement or until termination of
the Executive, whichever occurs earlier. Further details of the Options are
contained in the Option Agreement between the Executive and Lexington dated May
17, 2006 (the “Option Agreement”).

              In
addition to the above compensation, the Employer may award an annual bonus to
the Executive based on performance and as per industry standards, in the
discretion of the Employer, which bonus may not be given at all in any year. The
payment of a bonus in any year shall not be considered a precedent for any later
year and the payment shall not fetter the Employer's absolute discretion in
future years to pay or not to pay a bonus.

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4.           Benefits

              (1)
Expenses. It is understood and agreed that the Executive will incur expenses
in connection with his or her duties under this agreement. The Employer will
reimburse the Executive for any expenses, provided that the Executive provides
to the Employer an itemized written account and receipts acceptable to the
Employer within 10 days after they have been incurred. The Executive will not be
reimbursed for any item in excess of $5,000.00 unless approved in advance by the
board of directors.

              (2)
Benefit plans. The Executive shall be entitled to participate in any
plans maintained by the Employer for the benefit of the Employer's employees,
which shall include at least health, dental care and sickness insurance.
Participation by the Executive in any such plan is subject to the Executive
being able to satisfy the eligibility requirements which apply to the
participation of all of the Employer's employees in such plans.

5.           Authority

              (1)
The Executive shall have, subject always to the general or specific instructions
and directions of the board of directors of the Employer, full power and
authority to manage and direct the business and affairs of the Employer (except
only the matters and duties as by law must be transacted or performed by the
board of directors or by the shareholders of the Employer in a general meeting),
including power and authority to enter into contracts, engagements or
commitments of every nature or kind in the name of and on behalf of the Employer
and to engage and employ and to dismiss all managers and other employees and
agents of the Employer other than officers of the Employer, provided always that
no contract shall be made which might involve the Employer in an expenditure
exceeding $50,000.00 and no person shall be engaged or appointed as an employee
of the Employer at remuneration in excess of $60,000.00 per annum, nor shall the
remuneration of any employee or agent of the Employer be increased so as to
exceed $30,000.00 per annum without, in each case, the prior approval of the
board of directors.

              (2)
The Executive shall conform to all lawful instructions and directions given to
the Executive by the board of directors of the Employer, and obey and carry out
the by-laws of the Employer.

6.          
Service

              (1)
The Executive, throughout the term of the Executive’s appointment, shall devote
his or her full time and attention to the business and affairs of the Employer
and its parent and subsidiaries and shall not, without the consent in writing of
the board of directors of the Employer, undertake any other business or
occupation or become a director, officer, employee or agent of any other
company, firm or individual.

              (2)
The Executive shall well and faithfully serve the Employer and its parent and
subsidiaries and use his or her best efforts to promote the interests thereof
and shall not disclose the private affairs of the Employer and its subsidiaries
to any person other than the board of directors of the Employer or for any
purposes other than those of the Employer.

7.           Confidential
Information

              (1)
The Executive acknowledges that as the Vice President of Operations and in any
other position as the Executive may hold, he or she will acquire information
about certain matters and things which are confidential to the Employer, and
which information is the exclusive property of the Employer, including:

	 	(a) 	
      product design and manufacturing information;

	 	(b) 	
      names and addresses, buying habits and preferences of
      present customers of the Employer, as well as prospective
  customers;

	 	(c) 	
      pricing and sales policies, techniques and
    concepts;

	 	(d) 	
      trade secrets; and

	 	(e) 	 confidential information concerning the business operations
        or financing of the Employer, or its parent company.

2

              (2)
The Executive acknowledges that the information referred to in clause 9(1) could
be used to the detriment of the Employer. Accordingly, the Executive undertakes
not to disclose same to any third party either during the term of his or her
employment (except as may be necessary in the proper discharge of the
Executive’s employment under this agreement), or after the termination of his or
her employment (whether such termination is occasioned by the Executive, by the
Employer with or without cause, or by mutual agreement), except with the written
permission of an officer of the Employer. The Executive also agrees that the
unauthorized disclosure of any such information during the life of this
agreement shall justify the immediate termination of his or her employment.

              (3)
The Executive’s further obligations regarding Confidential Information are
contained in the Confidentiality Agreement dated May 17 2006 between the
Executive and the Employer (the “Confidentiality Agreement”).

8.          
Injunctive Relief

              (1)
The Executive acknowledges that in addition to any and all rights of the
Employer, the Employer shall be entitled to injunctive relief in order to
protect the Employer’s rights and property as set out in clauses 7, 8 and 9 of
this agreement.

              (2)
The Executive understands and agrees that the Employer has a material interest
in preserving the relationship it has developed with its customers against
impairment by competitive activities of a former employee. Accordingly, the
Executive agrees that the restrictions and covenants contained in clauses 7, 8
and 9 of this agreement and the Executive’s agreement to them by the execution
of this agreement are of the essence to this agreement and constitute a material
inducement to the Employer to enter into this agreement and to employ the
Executive, and that the Employer would not enter into this agreement absent such
an inducement. Furthermore, the existence of any claim or cause of action by the
Executive against the Employer, whether predicated on this agreement or
otherwise, shall not constitute a defense to the enforcement by the Employer of
the covenants or restrictions provided in clauses 7, 8 and 9 provided, however,
that if any provision shall be held to be illegal, invalid or unenforceable in
any jurisdiction, the decision shall not affect any other covenant or provision
of this agreement or the application of any other covenant or provision.

9.           Vacation

               The
  Executive shall be entitled during each year to paid vacation as follows:

	 		Four weeks of vacation if the Executive has been employed by the Employer
          for less than five years;
        
	Five weeks of vacation if the Executive has been employed by the Employer
          for more than five years, but less than ten years; or
        
	Six weeks of vacation if the Executive has been employed by the Employer
          for more than ten years. 

The vacation shall be taken at the time
  or times as the board of directors may determine. The Executive shall be allowed
  to carry forward any unused vacation into the next calendar year but not further.

10.          Termination
of Employment

               (1)
The parties understand and agree that the Executive’s employment pursuant to
this agreement may be terminated as follows:

               (a)     
by the Executive, at any time, for any reason, on the giving one year of notice
to the Employer i. The Employer may waive notice, in whole or in part and if it
does so, the Executive’s entitlement to remuneration and benefits pursuant to
this agreement will cease on the date it waives such 

3

notice;

               (b)      by
  the Employer in its absolute discretion and for any reason on giving the Executive
  notice of termination calculated as follows:

	 		One year of notice if the Employee has been employed by the Employer
          for a period less than five years;
        
	On year plus two months for each year worked if the Employee has been
          employed by the Employer for five years or more, but less than ten years;
        
	One year plus three months for each year worked if the Employee has
          been employed by the Employer for ten years or more, but less than 15
          years;
        
	One year plus four months for each year worked if the Employee has
          been employed by the Employer for 15 to 20 years. 

              
  or on paying to the Executive the equivalent pay in lieu of notice. The payments
  contemplated in this clause include all entitlement to either notice or pay
  in lieu of notice. The Executive agrees to accept the notice (or pay in lieu
  of notice) as set out in this clause in full and final settlement of all amounts
  owing to the Executive by the Employer on termination, including any payment
  in lieu of notice of termination, entitlement of the Executive under any applicable
  statute and any rights which the Executive may have at common law, and the Executive
  waives any claim to any other payment or benefits from the Employer.

               (c)      by
the Employer, in its absolute discretion, without any notice or pay in lieu
thereof, for “cause”. Cause includes, but is not limited to the following:

	 	(i) 	
      any material breach of the provisions of this agreement;
      

		(ii) 	
      any conduct of the Executive which tends to bring the
      Executive or the Employer into disrepute; 

		(iii 	
      the conviction of the Executive of a criminal offence
      punishable by indictment (where such cause is not prohibited by law); and
      

		(iv) 	
      any and all omissions, commissions or other conduct which
      would constitute “cause” at law. 

               (2)
The Executive’s employment shall also be terminated upon his or her death.

               (3)
The parties understand and agree that the giving of notice or the payment of pay
in lieu of notice by the Employer to the Executive on termination of the
Executive’s employment shall not prevent the Employer from alleging cause for
the termination.

               (4)
On termination of employment the Executive shall immediately resign all offices
held (including directorships) with the Employer and save as provided in this
agreement, the Executive shall not be entitled to receive any payment or
compensation for loss of office or otherwise by reason of the resignation. If
the Executive fails to resign as mentioned the Employer is irrevocably
authorized to appoint some person in the Executive’s name and on his or her
behalf to sign any documents or do any things necessary or requisite to give
effect to such resignation.

               (5)
The Executive’s obligations under clauses 7, 8 and 9 shall survive the
termination of the Executive’s employment pursuant to this agreement.

11.          Employer’s
Property

              The
Executive acknowledges that all items of any and every nature or kind created or
used by the Executive pursuant to his or her employment under this agreement, or
furnished by the Employer to the Executive, and all equipment, automobiles,
credit cards, books, records, reports, files, diskettes, manuals, literature,
confidential information or other materials, shall remain and be considered the
exclusive property of the Employer at all times and shall be surrendered to the
Employer, in good condition, promptly at the request of the Employer, or in the
absence of a request, on the termination of the Executive’s employment with the
Employer.

4

12.           Currency

                
Unless otherwise stated, all amounts in this agreement are in Canadian
dollars.

13.           Assignment
of Rights

           
    The rights which accrue to the Employer under this
agreement shall pass to its successors or assigns. The rights of the Executive
under this agreement are not assignable or transferable in any manner.

14.           Notices

               (1)
Any notice required or permitted to be given to the Executive shall be
sufficiently given if delivered to the Executive personally or if mailed by
registered mail to the Executive’s address last known to the Employer, or if
delivered to the Executive via facsimile.

               (2)
Any notice required or permitted to be given to the Employer shall be
sufficiently given if mailed by registered mail to the Employer’s head office at
its address last known to the Executive, or if delivered to the Employer via
facsimile.

15.           Severability

           
    In the event that any provision or part of this
agreement shall be deemed void or invalid by a court of competent jurisdiction,
the remaining provisions or parts shall be and remain in full force and
effect.

16.           Entire
Agreement

          
     This document, the Option Agreement dated May 17,
2006 and the Confidentiality Agreement dated May 17, 2006 constitute the entire
agreement between the parties with respect to the employment and appointment of
the Executive and any and all previous agreements, written or oral, express or
implied, between the parties or on their behalf, relating to the employment and
appointment of the Executive by the Employer, are terminated and cancelled and
each of the parties releases and forever discharges the other of and from all
manner of actions, causes of action, claims and demands whatsoever, under or in
respect of any agreement.

17.          
Modification of Agreement

          
     Any modification to this agreement must be in
writing and signed by the parties or it shall have no effect and shall be
void.

18.           Headings

          
     The headings used in this agreement are for
convenience only and are not to be construed in any way as additions to or
limitations of the covenants and agreements contained in it.

19.           Governing
Law

                
This agreement shall be construed in accordance with the laws of the Province of
Alberta.

IN WITNESS WHEREOF this Agreement is effective as of the
date first written.

	LEXCORE SERVICES INC. 	 	EXECUTIVE: 
	by its authorized signatory 	 	  
	/s/ Brent Nimeck 	 	/s/ Doug Chernesky 
	  	 	  
	Brent Nimeck, President 	 	Doug Chernesky 

5

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