Document:

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                   Exhibit 10.1 - Antigua Delinquent Letter

                       GOVERNMENT OF ANTIGUA AND BARBUDA

Prime Minister's Office
QUEEN ELIZABETH HIGHWAY
ST. JOHN'S, ANTIGUA, W.I.                        March 12, 2001
Telephone (268) 462-4956
          (268) 462-0773
          (268) 460-5100
Fax: (268) 462-3225

Mr. Donald L. Smith, Jr.
Chairman of the Board
Antigua Masonry Products, Ltd.
St. John's
Antigua

Dear Don:

Delinquent Note Payments
------------------------

This letter is in response to your letter of March 2 and my meeting with Rick
Hornsby, Minister Asot Michael and Financial Secretary Alphonse Derrick on March
5.

I appreciate the tone of your letter and your willingness to cooperate with this
government as you have so often done in the past.

We acknowledge that as of today the following note payments are delinquent:

 .    One monthly payment of US$50,000.

 .    One quarterly payment of US$312,500.

 .    Four monthly payments of US$61,400.

As I discussed with Rick Hornsby, the government of Antigua is experiencing a
cash flow shortage which has temporarily reduced our ability to make debt
service payments and certain operating expenses. We are taking steps to correct
this situation and expect to be back on an "even keel" by year end. These steps
include the implementation of a 2% gross receipts tax on unincorporated
businesses, an increase in property tax revenue associated with a reassessment
of property values, an increase in tax collection personnel and a significant
reduction in operating expenses.

Notwithstanding our current financial problems, we are committing to you that
certain basic payments will be made as follows:
<PAGE>

 .    US$50,000 per month from fuel tax revenues.

 .    US$312,500 per quarter from air force base revenue.

 .    Approximately US$45,000 per month from Newport Antigua, Ltd.

We recognize that the US$61,400 per month payments were a key element of the
debt restructure concluded in April 2000 as was the reduction in the interest
rate from 10% to 6%. As you pointed out in your letter to me, we need to work
together to resolve this financial crisis. Consequently, I am requesting that
you assist us by agreeing to the following short term deferral of payments:

 .    Delay the start of the US$61,400 per month payments to January 15, 2002.

 .    Pay the amount of US$362,500 over an eighteen month period commencing
     January 15, 2002 with the proviso that if the government realizes a
     significant payment from over US$80,000,000 which is the subject of
     litigation, this deferred payment will be paid immediately.

We also request that the 6% interest rate, instead of the default interest rate,
be retained as long as the payment schedules set forth in this letter are
maintained.

We very much appreciate your assistance in this matter. If you agree with this
proposal please sign a copy of this letter and return to me.

Very truly yours,

/s/ LESTER B. BIRD
------------------
Lester B. Bird
Prime Minister and
Minister of Finance

Enclosure

AGREED:

/s/ DONALD L. SMITH, JR.                 Date: /s/ 3-13-01
-----------------------
Donald L. Smith, Jr.

cc:  Alphonse Derrick, Financial Secretary
     Eustace Peters, Accountant General<PAGE>

                 [LETTERHEAD OF MEDTRONIC SOFAMOR DANEK, INC.]

                                                                   EXHIBIT 10.35

                               September 18,2001

VIA FACSIMILE AND FEDERAL EXPRESS
---------------------------------

Regeneration Technologies, Inc.
Attention: Mr. James M. Grooms, President
One Innovation Drive
Alachua, Florida 32615

     RE:  Amendment to Management Services Agreement

Dear Jamie:

     Please allow this letter to serve as a confirmation of our discussions and
as an amendment to the Management Services Agreement, dated as of July 23, 1996,
by and between Medtronic Sofamor Danek, Inc. ("MSD"), formerly Sofamor Danek
Group, Inc., and Regeneration Technologies, Inc. ("RTI"), as assignee of The
University of Florida Tissue Bank, Inc., as amended on April 21, 1997, January
2, 1998 and March 9, 1998 (the "Agreement"). The purpose of this amendment is to
add two products to the definition of Current Products under the Agreement.

1.   Schedule A of the Agreement is hereby amended by adding the following
     products to the list of Current Products: (i) the Cornerstone SR cervical
     cortical/cancellous composite allograft, and (ii) the Cornerstone SR
     cervical composite allograft, each of which is described in more detail in
     Schedule 2.1 hereto (the "Additional Current Products").

2.   The Agreement is hereby amended at add a new Section 3.4(a)(iii):

               (iii)  Notwithstanding the foregoing, the calculation of the
          Management Services Fee described above shall not include the actual
          net invoiced amount for the Additional Current Products, and the
          Management Services Fee for the Additional Current Products shall be
          fifty percent (50%) of the actual net invoiced amount from RTI to RTI
          Customers for the Additional Current Products subject to RTI Customer
          Instructions submitted by MSD to RTI. If the FDA and any other
          applicable state or federal agencies state in writing that the
          combination of tissue from multiple donors in single graft ("Pooling")
          is not in violation of the statutes, regulations, policies, standards
          or guidelines of such agencies, then RTI may do so and the Management
          Services Fee for the Additional Current Products produced utilizing
          such process shall be sixty percent (60%) of the actual net invoiced
          amount.

When Life Depends on Medical Technology
<PAGE>

Regeneration Technologies, Inc.
Page 2
September 18, 2001

3.   Schedule 2.1 is hereby amended by adding the following:

          Additional Current Products: (i) the Cornerstone SR cervical
          cortical/cancellous composite allograft is to be assembled by
          mechanical means; shown in the attached reference print to be pinned,
          but not limited to this mechanical assembly technique. The Cornerstone
          SR cervical cortical/cancellous composite allograft will have sizes
          similar, but not limited to, those currently provided in the
          Cornerstone SR cortical blocks. Surface grooves, similar to the
          Cornerstone SR cortical blocks, may or may not be included on these
          Cornerstone SR cervical cortical/cancellous composite allografts. (ii)
          The Cornerstone SR cervical cortical composite allograft is to be
          assembled by mechanical means from all cortical tissue; shown in the
          attached reference print to be pinned, but not limited to this
          mechancial assembly technique. The Cornerstone SR cervical cortical
          composite allograft will have similar sizes, but not limited to, those
          currently provided in the Cornerstone SR cortical blocks. Surface
          grooves, similar to the Cornerstone SR cortical blocks, may or may not
          be incorporated into this Cornerstone SR cervical cortical composite
          allograft.

     Section 3.1(d) of the Agreement provides that MSD "will use its best
efforts to actively support the distribution and use of the UFTB Product
consistent with Danek's standards." MSD acknowledges that this obligation
applies to the Additional Current Products described in this amendment.

     If this amendment is agreeable to you, please sign both of these originals
and return one of them to MSD. Your execution of this amendment shall serve as
an agreement that RTI will not utilize the process of Pooling, as defined above,
to produce the Additional Current Products until such time as the FDA and any
other applicable state or federal agency confirms in writing that such process
is not a violation of the statutes, regulations, policies, standards and
guidelines of such agencies. In addition, as we discussed, MSD is prepared to
meet with you and other RTI representatives to resolve certain disputes under
the Agreement with respect to the payment terms and the application of the
definitions of "line extensions" and "new products."  Please contact me to
discuss the timing and location of such a meeting.

                                   Very truly yours,

                                   /s/ Peter L. Wehrly

                                   Peter L. Wehrly
<PAGE>

Regeneration Technologies, Inc.
Page 3
September 18, 2001

AGREED TO AND ACCEPTED:

REGENERATION TECHNOLOGIES, INC.

/s/ James M. Grooms
----------------------------
James M. Grooms
PresidentStock Bonus Agreement

 Exhibit 10.01
 August 22, 2001
 Ken
Burckhardt
 390 La Strada Drive #15
 San Jose, CA 95123
 Re:      Stock Bonus Agreement
 Dear Ken:

On behalf of ONI Systems Corp. ("ONI"), I am pleased to offer you the position of Interim Chief Financial Officer for a term which begins on August 9, 2001 and continues until such time as ONI has
hired a permanent Chief Financial Officer ("Permanent CFO"). During this term, your title will be Vice President, Finance and Interim Chief Financial Officer and, in this position, you will be reporting directly to the Chief Executive
Officer.
 In connection with this position, the Compensation Committee of ONI’s Board of Directors will award you a stock bonus of 100,000 shares of ONI common stock (the "Stock
Bonus"). In order to receive the Stock Bonus, you must be providing services to ONI as an employee on February 9, 2002 (the "Award Date") when the Stock Bonus will be issued.
 In
the event that you are subject to a trading Blackout Period, as defined in ONI’s Procedures and Guidelines Governing Securities Trading by Company Insiders, on the Award Date, the Award Date will automatically be delayed until you are no longer
subject to the Blackout Period; provided however, that, such delay in the Award Date shall not affect your right to receive the Stock Bonus if you are providing services to ONI as an employee on February 9, 2002.
 The Stock Bonus will be subject to the terms and conditions of ONI’s 2000 Equity Incentive Plan. Upon issuance of the Stock Bonus, you will be required to make a payment in the amount of the par value of $0.0001
per share of common stock for an aggregate payment of $10.00 to ONI, as required by Delaware law.
 In addition to the Stock Bonus, provided that you continue to provide services to ONI as an
employee through February 9, 2002, the options held by you to purchase an aggregate of 150,000 shares pursuant to ONI’s 1998 Equity Incentive Plan, granted May 3, 2000, will thereafter be vested and exercisable with respect to a
number of shares equivalent to six months of vesting in addition to the shares vested and exercisable pursuant to the terms of such options.

	    
	
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 Ken Burckhardt
 August 22, 2001
 Page 2
 Except as set forth above, your compensation and benefits will continue at
their current levels and all other terms of your employment with ONI will remain unchanged.
 Your employment with the Company will continue to be on an "at will" basis, meaning that either
you or the Company may terminate your employment at any time for any reason or no reason, without further obligation or liability.
 In the event of any actual or "involuntary" termination
(as defined below) of your employment by ONI without Cause, as such term is defined in ONI’s 2000 Equity Incentive Plan, you will be awarded the full Stock Bonus on your last day of employment, subject to your executing a standard form of
release acceptable to ONI and you.
 An "involuntary" termination will be deemed to have occurred if both (A) any of the following actions is taken by ONI and such action is not reversed in
full by ONI within fourteen days: (i) your base salary and benefits are materially reduced, provided that any reduction in base salary rate shall be deemed "material," (ii) you are required to perform your employment obligations (other
than travel on business) at a location more than sixty (60) miles away from ONI’s current offices, and/or (iii) the terms of this offer letter are not assumed in full by any acquirer or other successor to ONI, and (B) you, after the expiration
of such fourteen-day period, resign in writing stating that your resignation is as a result of, and specifying in reasonable detail the nature of such uncured action listed above. Changes in ONI’s management or reporting structure, or changes
in your position, title, or duties, including but not limited to the removal of "Interim Chief Financial Officer" from your title, will not constitute an "involuntary" termination.
 To indicate your acceptance of the Company’s offer, please sign and date this letter in the space provided below and return it to me. This letter, together with the Invention Assignment and Confidentiality Agreement between you and
ONI, dated May 3, 2000 and the Offer Letter between you and ONI, dated May 3, 2000, set forth the terms of your employment with the Company and supersede any prior representations or agreements, whether written or oral. This letter may not be
modified or amended except by a written agreement, signed by ONI and by you.
 Sincerely,

	 /s/ Hugh Martin
 	  	 /s/ Ken Burckhardt
 
	  	  	  
	 Hugh Martin
 	  	                                      
                                        
                  
	 Chairman, President and
 Chief Executive Officer
 ONI Systems Corp.
 	  	 Employee Acceptance/Start Date
 

 
	    
	
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