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EXHIBIT 10.34    
  

January
25, 2002 

Tanning
Technology Corporation

4600 S. Syracuse Street

Suite 1200

Denver, CO 80237

Attention: Larry Tanning 

Re:
Transfer of Tanning Shares

        I,
Bipin Agarwal, on behalf of myself and WinSoft Corporation (the "Seller"), hereby agree to transfer to Tanning Technology Corporation ("Tanning"), on the Transaction Date (as defined
below), that number of shares of Tanning common stock, par value $.01 (the "Shares") sufficient to fully repay all amounts outstanding, together with accrued interest (the "Repayment Amount") under my
Promissory Note to the Company dated July 30, 1999, as amended July 31, 2001 (such transfer and repayment, the "Transaction"). The number of shares to be transferred to the Company in
the Transaction shall be equal to the Repayment Amount divided by the closing market price per Share of the Shares on the business day immediately preceding the Transaction Date. The "Transaction
Date" will be as soon as reasonably practicable after Tanning's fourth quarter 2001 earnings release, but in no event sooner than 2 business days following such release. 

        In
contemplation of the foregoing, I represent, on behalf of myself and the Seller, as follows: 

	1.
	Seller
is duly organized, validly existing and in good standing under the laws of the jurisdiction in which it is organized and has full corporate power and authority to consummate the
Transaction.

	2.
	The
consummation of the Transaction will not violate any law or regulation applicable to me or to Seller.

	3.
	I
have full power and authority to consummate the Transaction on behalf of the Seller, and Seller has taken all necessary action, corporate or otherwise, to authorize and consummate
the Transaction.

	4.
	Seller
has good and valid title to the Shares, free and clear of any liens or encumbrances of any kind.

	5.
	Upon
payment for and delivery of the Shares, Tanning will have good and valid title to the Shares, free and clear of any liens or encumbrances of any kind. 

        I
understand that Tanning will rely on the above representations in consummating the Transaction. 

        It
is understood and agreed that consummation of the Transaction shall constitute full and final repayment of all amounts owing under the Promissory Note referred to above. 

	 	 	 	 	Very truly yours,
	 	 	 	 	  

    
 Bipin Agarwal, individually and on behalf of WinSoft Corporation as its
	

 	
 	

 	
 	

	

Agreed and Accepted:	
 	

 
	

Tanning Technology Corporation	
 	

 
	

	
 	

 
	By:	 	Frederick H. Fogel	 	 
	Its:	 	Executive Vice President, Business Affairs and General Counsel	 	 

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EXHIBIT 10.34<Page>

                                                                    EXHIBIT 4.5

                   THIRD AMENDMENT TO STOCKHOLDER RIGHTS AGREEMENT

     THIS THIRD AMENDMENT TO STOCKHOLDER RIGHTS AGREEMENT (this "Amendment"),
is executed by and between Enchira Biotechnology Corporation (f/k/a Energy
BioSystems Corporation), a Delaware corporation (the "Company"),
Computershare Investor Services, LLC ("Computershare") and Harris Trust and
Savings Bank ("Harris"), at the direction of the Company.

                                     RECITALS

     WHEREAS, the Company and Harris are parties to a Stockholder Rights
Agreement dated as of March 8, 1995, as amended by that certain First
Amendment dated as of April 30, 1997 and Second Amendment to Rights Agreement
dated June 22, 2000 (the "Rights Agreement");

     WHEREAS, the Company desires to appoint Computershare as successor
Rights Agent under the Rights Agreement, effective as of February 25, 2002,
and as of such date, Harris will be relieved of its duties as Rights Agent
under the Rights Agreement;

     WHEREAS, the Company, pursuant to Section 26 of the Rights Agreement,
desires to amend the Rights Agreement and on February 19, 2002, the Board of
Directors approved resolutions authorizing the amendment of the Rights Plan
as herein provided; and

     WHEREAS, pursuant to Section 26 of the Rights Agreement, the Company and
the Rights Agent, at the direction of the Company, hereby agree to amend the
Rights Agreement as set forth below.

     NOW, THEREFORE, the Rights Agreement is hereby amended as follows:

     1.   TERMINATION OF RIGHTS AGENT. The Company hereby terminates Harris
as Rights Agent under the Rights Agreement, effective as of February 25, 2002.

     2.   APPOINTMENT OF THE SUCCESSOR RIGHTS AGENT.  The Company hereby
appoints Computershare as successor Rights Agent under the Rights Agreement,
effective as of February 25, 2002, and Computershare hereby accepts such
appointment.

     3.   AMENDMENT OF RIGHTS AGREEMENT.  Effective as of the date of
appointment of Computershare as successor Rights Agent, the Rights Agreement
shall be amended as follows:

     (a)  Section 25 of the Rights Agreement is hereby amended by deleting
     the address for notice or demand to be given to the Rights Agent therein
     and substituting in lieu thereof the following:

          "Computershare Investor Services, LLC
          Two North LaSalle Street
          Chicago, Illinois 60602
          Attention: Steven R. Rothbloom"

     (b)  All references in the Rights Agreement to "Harris Trust and Savings
     Bank" or any prior Rights Agents shall for all purposes be deemed to refer
     to "Computershare Investor Services, LLC."

     (c)  AMENDMENT OF SECTION 1.

<Page>

          A.   Section 1(a) of the Rights Agreement is amended in its entirety
to read as follows:

               (a)  "Acquiring Person" shall mean any Person (as
          such term is hereinafter defined) who or which, together
          with all Affiliates and Associates (as such terms are
          hereinafter defined) of such Person, shall be the
          Beneficial Owner (as such term is hereinafter defined) of
          20% or more of the Common Shares of the Company then
          outstanding, but shall not include (i) the Company, (ii)
          any Subsidiary (as such term is hereinafter defined) of
          the Company, (iii) any employee benefit plan of the
          Company or of any Subsidiary of the Company or any Person
          or entity holding shares of capital stock of the Company
          for or pursuant to the terms of any such plan, in its
          capacity as an agent or trustee for any such plan, and
          (iv) any registered investment company or registered
          investment adviser acquiring or holding shares in the
          ordinary course of business for its clients and not for
          its own benefit for so long as such registered investment
          company or registered investment adviser is permitted to
          report its Beneficial Ownership of Common Shares on a
          Schedule 13G filed under the Exchange Act (as such term is
          hereinafter defined) (such registered investment company
          and registered investment adviser being hereinafter
          referred to as a "Schedule 13G Filer").  Notwithstanding
          the foregoing, no Person shall become an "Acquiring
          Person" as the result of an acquisition of Common Shares
          (i) by the Company which, by reducing the number of
          shares outstanding, increases the proportionate number of
          shares beneficially owned by such Person to 20% or more
          of the Common Shares of the Company then outstanding or
          (ii) by the Person solely as the result of the conversion
          or redemption of shares of the Company's Series B
          Preferred Stock, par value $.01 per share ("Series B
          Preferred Stock"), held by such Person (including any
          Common Shares received in such conversion or redemption
          in payment of any accrued but unpaid dividends on the
          Series B Preferred Stock held by such Person); provided,
          however, that such Person shall be deemed to be an
          "Acquiring Person" if such Person shall become the
          Beneficial Owner of 20% or more of the Common Shares of
          the Company then outstanding as a result of either share
          purchases by the Company or the conversion or redemption
          of Series B Preferred Stock owned by such Person
          (including any Common Shares received in such conversion
          or redemption in payment of any accrued but unpaid
          dividends on the Series B Preferred Stock held by such
          Person) and shall, after such share purchases by the
          Company or such conversion or redemption of Series B
          Preferred Stock, as the case may be, become the Beneficial
          Owner of any additional Common Shares of the Company.

          B.   Section 1(s) of the Rights Agreement is amended to remove the
references to the definitions of "Ethyl," "Gryphon" and "Haney" contained
therein.

     (d)  AMENDMENT OF SECTION 3.

     Section 3(a) of the Rights Agreement is amended in its entirety to read
as follows:

               (a)  Until the earlier of (i) the close of business on the
          30th day after the Shares Acquisition Date and (ii) the close
          of business on the 30th day after the date that a tender or
          exchange offer by any Person

<Page>

          (other than the Company, any Subsidiary of the Company,
          any employee benefit plan of the Company or of any
          Subsidiary of the Company, or any entity holding shares
          of capital stock of the Company for or pursuant to the
          terms of any such plan, in its capacity as an agent or
          trustee for any such plan or a Schedule 13G Filer) is
          first published or sent or given within the meaning of
          Rule 14d-2(a) (or any successor rule) of the General
          Rules and Regulations under the Exchange Act, the
          consummation of which would result in any Person becoming
          the Beneficial Owner of Common Shares aggregating 20% or
          more of the then outstanding Common Shares (including any
          such date which is after the date of this Agreement and
          prior to the issuance of the Rights; the earlier of such
          dates being herein referred to as the "Distribution
          Date"), (x) the Rights will be evidenced (subject to the
          provisions of paragraph (b) of this Section 3) by the
          certificates for Common Shares registered in the names of
          the holders thereof (which certificates for Common Shares
          shall also be deemed to be certificates for the Rights)
          and not by separate certificates, and (y) the Rights and
          interests therein will be transferable only in connection
          with the transfer of the associated Common Shares.  As
          soon as practicable after the Distribution Date, the
          Company will prepare and execute, the Rights Agent will
          countersign, and the Company will send or cause to be
          sent (and the Rights Agent will, if requested, send) by
          first-class, insured, postage-prepaid mail, to each
          record holder of Common Shares as of the close of
          business on the Distribution Date, at the address of such
          holder shown on the records of the Company, one or more
          Rights certificates, in substantially the form of Exhibit
          B hereto (a "Rights Certificate"), evidencing one Right
          for each Common Share so held, subject to adjustment as
          provided herein.  In the event that an adjustment in the
          number of Rights per Common Share has been made pursuant
          to Section 11(n) hereof, then at the time of distribution
          of the Rights Certificates, the Company shall make the
          necessary and appropriate rounding adjustments (in
          accordance with Section 14(a) hereof) so that Rights
          Certificates representing only whole numbers of Rights
          are distributed and cash is paid in lieu of any fractional
          Rights. As of and after the Distribution Date, the Rights
          will be evidenced solely by such Rights Certificate.

     (e)  AMENDMENT OF SECTION 11.

     Section 11(a)(ii) of the Rights Agreement is amended in its entirety to
read as follows:

               (ii)  In the event that any Person (other than (i)
          the Company, (ii) any Subsidiary of the Company, (iii)
          any employee benefit plan of the Company or of any
          Subsidiary of the Company or any Person or entity holding
          shares of capital stock of the Company for or pursuant to
          the terms of any such plan, in its capacity as an agent
          or trustee for any such plan or (iv) a Schedule 13G
          Filer), alone or together with its Affiliates and
          Associates, shall, at any time after the Rights Dividend
          Declaration Date, become an Acquiring Person then,
          promptly following the first occurrence of such event,
          proper provision shall be made so that each holder of a
          Right (except as provided in Section 7(e) hereof) shall
          thereafter have the right to receive, upon exercise
          thereof at the then current Purchase Price in accordance
          with the terms of this Agreement and in lieu of Preferred
          Share Fractions, such number of Common Shares

<Page>

          of the Company as shall equal the result obtained by (x)
          multiplying the then current Purchase Price by the then
          number of Preferred Share Fractions for which a Right is
          then exercisable and (y) dividing that product (which
          shall thereafter be referred to as the "Purchase Price"
          for each Right and for all purposes of this Agreement) by
          50% of the then current market price (determined pursuant
          to Section 11(d) hereof) per Common Share on the fifth day
          after the date on which a Person has become an Acquiring
          Person, or the fifth day after the Shares Acquisition
          Date, whichever market price shall be less (such number
          of shares being hereinafter referred to as the
          "Adjustment Shares").  In the event that any Person shall
          become an Acquiring Person and the Rights shall then be
          outstanding, the Company shall not take any action that
          would eliminate or diminish the benefits intended to be
          afforded by the Rights.

     (f)  AMENDMENT OF SECTION 21.

          Section 21 of the Rights Agreement is amended and replaced in its
entirety to read as follows:

               Section 21.  CHANGE OF RIGHTS AGENT.  The Rights
          Agent or any successor Rights Agent may resign and be
          discharged from its duties under this Agreement upon
          thirty (30) days' notice in writing mailed to the Company
          and to each transfer agent of the Preferred Shares and
          Common Shares by registered or certified mail, and to the
          holders of the Rights Certificates by first-class mail.
          The Company may remove the Rights Agent or any successor
          Rights Agent upon thirty (30) days' notice in writing,
          mailed to the Rights Agent or successor Rights Agent, as
          the case may be, and to each transfer agent of the
          Preferred Shares or Common Shares by registered or
          certified mail, and to the holders of the Rights
          Certificates by first-class mail.  If the Rights Agent
          shall resign or be removed or shall otherwise become
          incapable of acting, the resigning, removed, or
          incapacitated Rights Agent shall remit to the Company, or
          to any successor Rights Agent designated by the Company,
          all books, records, funds, certificates or other
          documents or instruments of any kind then in its
          possession which were acquired by such resigning, removed
          or incapacitated Rights Agent in connection with its
          services as Rights Agent hereunder, and shall thereafter
          be discharged from all duties and obligations hereunder.
          Following notice of such removal, resignation or
          incapacity, the Company shall appoint a successor to such
          Rights Agent.  If the Company shall fail to make such
          appointment within a period of thirty (30) days after
          giving notice of such removal or after it has been
          notified in writing of such resignation or incapacity by
          the resigning or incapacitated Rights Agent or by the
          holder of a Rights Certificate (who shall, with such
          notice, submit his Rights Certificate for inspection by
          the Company), then any registered holder of any Rights
          Certificate may apply to any court of competent
          jurisdiction for the appointment of a new Rights Agent.
          Any successor Rights Agent, whether appointed by the
          Company or by such a court, shall be (a) a corporation,
          limited liability company or trust company (or similar
          form of entity under the laws of any state of the United
          States or a foreign jurisdiction) authorized to conduct
          business under the laws of the United States or any state
          of the United States, which is authorized under such laws
          to exercise corporate trust, fiduciary or stockholder
          services powers and is subject to supervision or examination
          by a federal or state authority and which has

<Page>

          at the time of its appointment as Rights Agent a combined
          capital and surplus of at least $10,000,000 or (b) an
          Affiliate controlled by an entity described in clause (a)
          of this sentence.  After appointment, the successor
          Rights Agent shall be vested with the same powers,
          rights, duties and responsibilities as if it had been
          originally named as Rights Agent without further act or
          deed; but the predecessor Rights Agent shall deliver and
          transfer to the successor Rights Agent any property at
          the time held by it hereunder, and execute and deliver
          any further assurance, conveyance, act or deed necessary
          for the purpose.  Not later than the effective date of
          any such appointment, the Company shall file notice
          thereof in writing with the predecessor Rights Agent and
          each transfer agent of the Common Shares or Preferred
          Shares, and mail a notice thereof in writing to the
          registered holders of the Rights Certificates.  Failure
          to give any notice provided for in this Section 21,
          however, or any defect therein, shall not affect the
          legality or validity of the resignation or removal of the
          Rights Agent or the appointment of the successor Rights
          Agent, as the case may be.

     4.   EFFECTIVENESS.

     This Amendment shall be deemed effective as of February 25, 2002.
Except as amended hereby, the Rights Agreement shall remain in full force and
effect and shall be otherwise unaffected hereby.

     5.   MISCELLANEOUS.

     This Amendment shall be deemed to be a contract made under the laws of
the State of Delaware and for all purposes shall be governed by and construed
in accordance with the laws of such state applicable to contracts to be made
and performed entirely within such state.  This Amendment may be executed in
any number of counterparts, each of such counterparts shall for all purposes
be deemed to be an original, and all such counterparts shall together
constitute but one and the same instrument.  If any term, provision, covenant
or restriction of this Amendment is held by a court of competent jurisdiction
or other authority to be invalid, illegal, or unenforceable, the remainder of
the terms, provisions, covenants and restrictions of this Amendment shall
remain in full force and effect and shall in no way be affected, impaired or
invalidated.

                  [Remainder of Page Intentionally Left Blank]

<Page>

     IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
duly executed on February 20, 2002.

                              ENCHIRA BIOTECHNOLOGY CORPORATION

                              By:    /s/ Peter P. Policastro, Ph.D.
                                 -----------------------------------------------
                                 Peter P. Policastro, Ph.D.
                                 President and Chief Executive Officer

                              COMPUTERSHARE INVESTOR SERVICES, LLC

                              By:    /s/ Michael Gardner
                                 -----------------------------------------------
                              Name:  Michael Gardner
                                   ---------------------------------------------
                              Title: Executive Vice President of Client Services
                                    --------------------------------------------

                              HARRIS TRUST AND SAVINGS BANK

                              By:    /s/ Martin J. McHale
                                 -----------------------------------------------
                              Name:  Martin J. McHale
                                   ---------------------------------------------
                              Title:  Vice President
                                    --------------------------------------------

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