Document:

Exhibit 10.2

                            AGREEMENT TO CONVERT DEBT

      This  Agreement to Convert Debt (the  "Agreement")  is made as of the 11th
day of May 2005 (the "Effective  Date") by and between USDR,  Inc.  (referred to
herein as the "Holder") and US Global  Nanospace,  Inc., a Delaware  corporation
(referred to herein as the "Company").

RECITALS

      A.  Pursuant  to a  promissory  note  originally  dated  June 6,  2003 and
subsequently  amended  on June 11,  2004 and  again on  December  30,  2004 (the
"Promissory  Note"),  the Company currently owes to the Holder, in principal and
accrued interest, the sum of $190,152.42 (the "Amount Owed").

      B. According to the terms of the Promissory  Note, the Amount Owed was due
and payable in full on February 28, 2005.

      C. The Company wishes to pay the Amount Owed by issuing  securities to the
Holder and the Holder has agreed to accept the Company's  securities as full and
final  payment  of the  Amount  Owed,  in  accordance  with  the  terms  of this
Agreement.

      Therefore, the Company and the Holder agree as follows:

AGREEMENT

      1. Transfer of Securities and Cancellation of Debt.

            (a)  Securities to be Issued.  The Holder agrees to accept,  and the
Company  agrees to issue and  transfer  to the Holder,  2,971,132  shares of the
Company's  Common Stock,  $0.001 par value,  having a value of $0.064 per share,
which was the  closing  price of the Common  Stock on the  Effective  Date.  The
Common  Stock  issued in  payment  of the  loans  shall be  referred  to in this
Agreement as the "Shares".

            (b) Exchange of Documents. The certificates  representing the Shares
shall be  delivered  to the Holder as soon as  practicable.  Upon receipt of the
Shares, (i) the Holder will mark the Promissory Note as "Paid" and will transfer
the  Promissory  Note to the  Company,  and (ii) the  Company  shall  record the
payment of the Promissory Note on its books and records.

      2. Representations by Company.

            The Company hereby represents and warrants to the Holder as follows:

                  (i) The Company is duly  organized,  validly  existing  and in
            good standing under the laws of the State of Delaware.

                  (ii)  The  Company  has  all  requisite  power  and  authority
            (corporate  or  otherwise)  to execute,  deliver  and  perform  this
            Agreement  and  the  transactions   contemplated  thereby,  and  the
            execution, delivery and performance by the Company of this Agreement
            has been duly authorized by all requisite  action by the Company and
            this  Agreement,   when  executed  and  delivered  by  the  Company,
            constitutes   a  valid  and  binding   obligation  of  the  Company,
            enforceable  against  the  Company  in  accordance  with its  terms,
            subject  to  applicable  bankruptcy,   insolvency,   reorganization,
            fraudulent  conveyance,  moratorium or other similar laws  affecting
            creditors'  rights  and  remedies  generally,  and  subject,  as  to
            enforceability,  to  general  principles  of equity  (regardless  of
            whether enforcement is sought in a proceeding at law or in equity).

                  (iii) The execution,  delivery and  performance by the Company
            of  this  Agreement  have  been  duly  authorized  by all  requisite
            corporate  action of the Company;  and this  Agreement has been duly
            executed and delivered by the Company.

                  (iv) The Shares  will be duly and validly  issued,  fully paid
            and nonassessable, and free of any liens or encumbrances.

      3. Representations by the Holder.

            The Holder hereby represents and warrants to the Company as follows:

                  (i)  The  Holder  has  all   requisite   power  and  authority
            (corporate  or  otherwise)  to execute,  deliver  and  perform  this
            Agreement  and  the  transactions   contemplated  thereby,  and  the
            execution,  delivery and performance by the Holder of this Agreement
            has been duly  authorized by all requisite  action by the Holder and
            this   Agreement,   when  executed  and  delivered  by  the  Holder,
            constitutes   a  valid  and  binding   obligation   of  the  Holder,
            enforceable against the Holder in accordance with its terms, subject
            to applicable  bankruptcy,  insolvency,  reorganization,  fraudulent
            conveyance,  moratorium or other similar laws  affecting  creditors'
            rights and remedies generally, and subject, as to enforceability, to
            general principles of equity  (regardless of whether  enforcement is
            sought in a proceeding at law or in equity).

                  (ii)  The  Holder  has a  pre-existing  personal  or  business
            relationship with the Company and its officers and directors.

                  (iii) The Holder is an "accredited investor",  as that term is
            defined in Rule 501 of Regulation D in that the Holder is a director
            and officer of the Company.

                  (iv) The Holder has complied  with all  applicable  investment
            laws  and  regulations  in  force  relating  to the  legality  of an
            investment in the Shares in the jurisdiction in which he is subject,
            and the Holder has  obtained  any  consent,  approval or  permission
            required in that jurisdiction.

                  (v) The Holder  understands and  acknowledges  that the Shares
            have not been registered with the Securities and Exchange Commission
            under  Section  5 of the  of the  Securities  Act or  registered  or
            qualified  with  any  applicable  state  or  territorial  securities
            regulatory  agency in reliance upon one or more exemptions  afforded
            from registration or qualification.

                  (vi) The Holder  understands and acknowledges  that the Shares
            are deemed to be "restricted"  securities  under the Securities Act,
            and may be re-sold  only  pursuant  to  exemptions  provided  by the
            Securities  Act. The Holder  understands and  acknowledges  that the
            Company is  required to place a legend on each  certificate  stating
            that the Shares have not been registered under the Securities Act.

                  (vii) The Holder  understands and acknowledges that: (i) prior
            to any sale, transfer,  assignment,  pledge,  hypothecation or other
            disposition of the Shares,  he must either:  (1) furnish the Company
            with an  opinion  of  counsel,  in  form  and  substance  reasonably
            satisfactory to the Company and to its legal counsel,  to the effect
            that  such   disposition  is  exempted  from  the  registration  and
            prospectus  delivery  requirement  under the  Securities Act and the
            securities laws of the jurisdiction in which the Holder resides, and
            legal counsel for the Company shall have  concurred in such opinion;
            or (2) satisfy the Company  that a  registration  statement  on Form
            SB-2 under the Securities Act (or any other form  appropriate  under
            the  Securities  Act,  or any form  replacing  any such  form)  with
            respect to the  securities  proposed to be so disposed of shall then
            be   effective;   and  that  such   disposition   shall   have  been
            appropriately   qualified  or  registered  in  accordance  with  the
            applicable  securities laws of the  jurisdiction in which the Holder
            resides.

                  (viii) The Holder is entering  into this  transaction  for the
            Holder's own account, own risk and own beneficial  interest,  is not
            acting as an agent,  representative,  intermediary,  nominee or in a
            similar capacity for any other person or entity,  nominee account or
            beneficial  owner,  whether a natural  person or entity  (each  such
            natural person or entity, an "Underlying  Beneficial  Owner") and no
            Underlying  Beneficial  Owner  will have a  beneficial  or  economic
            interest in the Shares  (whether  directly or indirectly,  including
            without limitation,  through any option,  swap, forward or any other
            hedging or derivative  transaction)  and does not have the intention
            or obligation to sell, pledge, distribute, assign or transfer all or
            a portion of the Shares to any  Underlying  Beneficial  Owner or any
            other person.

                  (ix)  The  Holder  hereby  represents  and  warrants  that the
            proposed  investment  in the Company does not directly or indirectly
            contravene United States federal, state, local or international laws
            or  regulations  applicable  to  the  Holder,  including  anti-money
            laundering laws (a "Prohibited Investment").

                  (x) Federal  regulations and Executive Orders  administered by
            the U.S.  Treasury  Department's  Office of Foreign  Assets  Control
            ("OFAC")   prohibit,   among  other   things,   the   engagement  in
            transactions with, and the provision of services to, certain foreign
            countries,  territories, entities and individuals. The lists of OFAC
            prohibited countries, territories, persons and entities can be found
            on the OFAC  website  at  <www.treas.gov/ofac>.  The  Holder  hereby
            represents and warrants that the Holder is not a country, territory,
            person or entity named on an OFAC list,  nor is the Holder a natural
            person or entity with whom  dealings are  prohibited  under any OFAC
            regulations.

                  (xi) The Holder  represents  and  warrants  that  neither  the
            Holder  nor any  Underlying  Beneficial  Owner is a  senior  foreign
            political  figure, or any immediate family member or close associate
            of a senior  foreign  political  figure  within the  meaning of, and
            applicable  guidance  issued  by  the  Department  of  the  Treasury
            concerning,  the U.S. Bank Secrecy Act (31 U.S.C.  ss.5311 et seq.),
            as amended, and any regulations promulgated thereunder.

                  (xii) The Holder agrees  promptly to notify the Company should
            the Holder become aware of any change in the  information  set forth
            in subparagraphs (viii) through (xi).

                  (xiii) The Holder  agrees to indemnify  and hold  harmless the
            Company,  its  affiliates,  their  respective  directors,  officers,
            shareholders, employees, agents and representatives from and against
            any and all losses, liabilities, damages, penalties, costs, fees and
            expenses (including legal fees and disbursements)  which may result,
            directly or  indirectly,  from the  Holder's  misrepresentations  or
            misstatements  contained  herein  or  breaches  hereof  relating  to
            paragraphs (viii) through (xi).

                  (xiv) The Holder understands and agrees that,  notwithstanding
            anything to the contrary  contained in any document  (including  any
            side  letters or similar  agreements),  if,  following  the Holder's
            investment in the Company,  it is discovered  that the investment is
            or  has  become  a  Prohibited   Investment,   such  investment  may
            immediately  be redeemed by the Company or  otherwise  be subject to
            the  remedies  required by law,  and the Holder  shall have no claim
            against  the  Company  for any form of  damages  as a result of such
            forced redemption or other action.

                  (xv) Upon the written  request  from the  Company,  the Holder
            agrees to  provide  all  information  to the  Company  to enable the
            Company  to  comply  with  all  applicable   anti-money   laundering
            statutes,  rules,  regulations and policies,  including any policies
            applicable to a portfolio  investment held or proposed to be held by
            the Company.  The Holder understands and agrees that the Company may
            release confidential information about the Holder and any Underlying
            Beneficial Owner(s) to any person if the release of such information
            is necessary to comply with applicable statutes,  rules, regulations
            and policies.

      4. Termination of Security Interests and Financing Statements.

            Upon  the  transfer  to the  Holder  of  the  Shares,  all  security
interests  created  in favor of the  Holder,  if any,  shall  terminate  and the
Company shall be entitled to terminate any and all financing statements in favor
of the  Holder,  no matter  where filed or  recorded,  if any. At no cost to the
Holder but without the payment of  additional  consideration,  the Holder  shall
cooperate  with the Company  and  perform  any acts  required on the part of the
Holder to terminate the financing statements.

<PAGE>

      5. Miscellaneous.

            (a) Amendments and Waivers. The provisions of this Agreement may not
be amended, modified or supplemented, and waivers or consents to departures from
the provisions hereof may not be given,  unless the same shall be in writing and
signed by the Company and the Holder.

            (b)  Notices.  Any  and  all  notices  or  other  communications  or
deliveries  to be  provided  by the Holder  hereunder  shall be in  writing  and
delivered personally,  by facsimile or sent by a nationally recognized overnight
courier service,  addressed to the Company at 1016 Harris Road, Arlington, Texas
76001, facsimile number (817) 375-3401, Attn: President or such other address or
facsimile  number as the Company may specify for such  purposes by notice to the
Holder  delivered in accordance with this Section.  Any and all notices or other
communications or deliveries to be provided by the Company hereunder shall be in
writing and delivered personally,  by facsimile, sent by a nationally recognized
overnight  courier  service  addressed to the Holder at an address and facsimile
number to be provided by Holder. Any notice or other communication or deliveries
hereunder shall be deemed given and effective on the earliest of (i) the date of
transmission,  if such notice or communication is delivered via facsimile at the
facsimile telephone number specified in this Section prior to 5:30 p.m. (Central
time),  (ii)  the  date  after  the  date of  transmission,  if such  notice  or
communication  is delivered  via  facsimile at the  facsimile  telephone  number
specified in this Section  later than 5:30 p.m.  (Central  time) on any date and
earlier than 11:59 p.m.  (Central time) on such date,  (iii) the second Business
Day following the date of mailing,  if sent by nationally  recognized  overnight
courier service, or (iv) upon actual receipt by the party to whom such notice is
required to be given.

            (c)  Successors  and  Assigns.  This  Agreement  shall  inure to the
benefit of and be binding upon the successors  and permitted  assigns of each of
the  parties.  Neither  the  Holder  nor the  Company  may  assign its rights or
obligations hereunder without the prior written consent of the other.

            (d)  Counterparts.  This  Agreement may be executed in any number of
counterparts,  each of which when so executed  shall be deemed to be an original
and, all of which taken together shall constitute one and the same Agreement. In
the event that any  signature  is  delivered  by  facsimile  transmission,  such
signature shall create a valid binding  obligation of the party executing (or on
whose behalf such signature is executed) the same with the same force and effect
as if such facsimile signature were the original thereof.

            (e) Severability. If any term, provision, covenant or restriction of
this  Agreement  is held by a court of  competent  jurisdiction  to be  invalid,
illegal,  void  or  unenforceable,  the  remainder  of  the  terms,  provisions,
covenants  and  restrictions  set forth  herein  shall  remain in full force and
effect and shall in no way be affected, impaired or invalidated, and the parties
hereto  shall use their  reasonable  efforts to find and  employ an  alternative
means to achieve the same or substantially  the same result as that contemplated
by such term,  provision,  covenant or restriction.  It is hereby stipulated and
declared to be the  intention of the parties  that they would have  executed the
remaining terms, provisions, covenants and restrictions without including any of
such that may be hereafter declared invalid, illegal, void or unenforceable.

            (f) Headings.  The headings in this Agreement are for convenience of
reference only and shall not limit or otherwise affect the meaning hereof.

            IN WITNESS  WHEREOF,  the parties have  executed  this  Agreement to
Convert Debt as of the date first written above.

                   US GLOBAL NANOSPACE, INC.

                    By: /s/ John Robinson
                        ---------------------------------
                        John Robinson, President

                   USDR, INC.

                   By: /s/ John Robinson
                      ---------------------------------
                      John RobinsonExhibit 10.32

THIS PROMISSORY NOTE HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933,
AS AMENDED, OR QUALIFIED UNDER ANY STATE SECURITIES LAWS. THIS PROMISSORY NOTE
HAS BEEN ACQUIRED FOR INVESTMENT PURPOSES ONLY, AND NOT WITH A VIEW TO, OR IN
CONNECTION WITH, THE SALE OR DISTRIBUTION THEREOF. NO SUCH SALE OR DISTRIBUTION
MAY BE EFFECTED UNLESS PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT RELATED
THERETO, OR AN EXEMPTION FROM SUCH REGISTRATION STATEMENT REQUIREMENTS.

                             SECURED PROMISSORY NOTE

Principal Amount:  $400,000.00                   San Francisco, California
Interest Rate:  5.00% per annum                            January 4, 2005

            FOR VALUE  RECEIVED,  the  undersigned,  Crdentia  Corp., a Delaware
corporation   ("Crdentia"),   Baker  Anderson   Christie,   Inc.,  a  California
corporation,  Nurses Network, Inc., a California corporation,  New Age Staffing,
Inc., a Delaware corporation, PSR Nurses, Ltd., a Texas limited partnership, PSR
Nurse Recruiting,  Inc., a Texas corporation, PSR Nurses Holdings Corp., a Texas
corporation,   CRDE  Corp.,   a  Delaware   corporation,   Arizona  Home  Health
Care/Private Duty, Inc., an Arizona corporation,  and Care Pros Staffing, Inc, a
Texas corporation (each  individually and referred to collectively as "Issuer"),
jointly and severally  promise to pay to MedCap  Partners L.P., or any assignees
of the Note ("Holder"), by wire transfer to such account as Holder may from time
to time designate in writing, the principal amount of Two Hundred Fifty Thousand
Dollars  ($400,000.00)  (the  "Principal  Amount")  payable  at  such  times  as
specified  in  paragraph 1 below.  Issuer also  promises to pay  interest on the
unpaid  principal  amount  from the date of this Note until this Note is paid in
full, at the rate of five percent  (5.00%) per annum, at such times as specified
in this  Agreement.  This Note is executed  and  delivered  pursuant  to, and in
recognition of, a loan of $400,000 made by Holder to Issuer on the date hereof.

            1.  Principal  Payment.  The  Principal  Amount  shall be payable to
Holder on the earlier of (i) two business days (as defined below)  following the
date of Crdentia's  receipt of written demand by Holder  requesting such payment
or (ii) the date on which Crdentia  completes a private offering or offerings of
its equity securities (whether such offering or offerings consist of one or more
transactions) in an amount of not less than $5.0 million (the "Maturity  Date").
All payments shall be made in immediately  available funds in lawful currency of
the United States of America,  without offset,  deduction or counterclaim of any
kind.  A "business  day" shall mean any day except  Saturday,  Sunday or any day
that is a legal  holiday in the State of  California.  Holder  may make  written
demand by facsimile,  email or other usual means of communication between Holder
and Crdentia.
<PAGE>

            2. Interest. Prior to the Maturity Date or the occurrence of an
Event of Default (as defined in paragraph 3 below), the unpaid Principal Amount
periodically outstanding under this Note shall bear simple interest at the rate
of five percent (5.00%) per annum, calculated on the basis of a 365-day year,
based on the actual number of days elapsed (including the first day, but
excluding the last day). All accrued and unpaid interest on this Note shall be
due and payable on the Maturity Date. After the Maturity Date or upon the
occurrence and during the continuation of any Event of Default, any unpaid
Principal Amount or accrued interest shall bear interest at the rate of ten
percent (10%) per annum until paid in full.

            3. Events of Default. The occurrence of any of the following events
shall constitute an event of default under this Note: (a) Issuer's failure to
pay the Principal Amount when due and payable; (b) any Issuer making an
assignment for the benefit of its creditors; (c) any Issuer filing (or
consenting to the filing of) any petition or complaint pursuant to federal or
state bankruptcy or insolvency laws, seeking the appointment of a receiver or
trustee for any of its assets, seeking the adjudication of such Issuer as
bankrupt or insolvent, seeking an "order for relief" under such statutes, or
seeking a reorganization of or a plan of arrangement for Issuer; or (d) any
default or breach by any Issuer of or under any agreement for borrowed money,
including loan agreements, or breach under any capital equipment lease
agreement, by which such Issuer is bound or obligated following the expiration
of any applicable grace period. Upon the occurrence of an Event of Default, the
entire Principal Amount then outstanding, together with accrued and unpaid
interest, shall become immediately due and payable.

            4. Amended and Restated Security Agreement. This Note is executed
and delivered together with an Amended and Restated Security Agreement (the
"Security Agreement"), entered into as of November 29, 2004 and as amended and
restated on January 4, 2005 between Holder and Issuer (Issuer therein referred
to as "Grantor") by which Grantor has granted Holder a security interest in the
right, title, and interest in and to all of Grantor's Collateral (as defined in
the Security Agreement), subject to the liens and encumbrances on the Collateral
existing as of the date hereof.

            5. Subordination. The indebtedness evidenced by this Note is
expressly junior and subordinate in right of payment to the prior payment in
full of all of Issuer's indebtedness under (i) that certain Loan and Security
Agreement, dated as of June 16, 2004, by and among Crdentia and its
subsidiaries, on the one hand, and Bridge Healthcare Finance, LLC, on the other
hand (the "Revolving Loan Agreement"), and (ii) that certain Loan and Security
Agreement, dated as of August 31, 2004, by and among Crdentia and its
subsidiaries, on the one hand, and Bridge Opportunity Finance, LLC, on the other
hand (the "Term Loan Agreement" and, together with the Revolving Loan Agreement,
the "Loan Agreement"). Notwithstanding anything herein to the contrary, no
payment of principal or interest shall be made on this Note if there exists any
default, or the existence of any event which, with the giving of notice, would
constitute a default, in the payment of any indebtedness under the Loan
Agreement, as determined by the terms of the Loan Agreement. Holder agrees to
execute all subordination documents reasonably required by Bridge Healthcare
Finance, LLC and/or Bridge Opportunity Finance, LLC.

                                      -2-
<PAGE>

            6. Prepayment. This Note may be prepaid, at the option of Issuer, in
whole or in part, at any time or from time to time, without penalty or premium;
provided, however, that any prepayment shall be applied first to the Principal
Amount then outstanding until paid in full and then to accrued and unpaid
interest as of the date of such prepayment. In the event that Issuer sells any
of the Collateral (as defined in the Security Agreement), the net proceeds from
such sale shall be applied as set forth in the Security Agreement and, to the
extent any proceeds are required to be applied to the payment of the Principal
Amount and interest hereunder, in accordance with the preceding sentence.

            7. Maximum Rate of Interest. In no event shall any interest rate
provided for hereunder exceed the maximum rate legally chargeable by Holder
under applicable law. If at any time such laws would render usurious any amount
due under this Note, then it is the express intention of Holder and Issuer that
Issuer not be required to pay interest on this Note at a rate in excess of the
maximum lawful rate, that the provisions of this paragraph 7 shall control over
all other provisions of this Note which may be in apparent conflict, that such
excess amount shall be immediately credited to the principal balance owing under
this Note (or, if this Note has been fully repaid, refunded by Holder to
Issuer), and the provisions hereof shall be immediately reformed and the amounts
thereafter decreased, so as to comply with the then applicable usury law, but so
as to permit the recovery of the fullest amount otherwise due under this Note.
Any credit or refund shall not cure or waive any default by Issuer under this
Note. For the purposes of this paragraph 7, the term "applicable law" means the
laws of the State of California, as such laws now exist or may be changed or
amended or come into effect in the future.

            8. Holder Representations.

                  (a) This Note is being acquired for Holder's own account, not
as a nominee or agent, and not with a view to the resale or distribution of any
part hereof in violation of the Securities Act of 1933, as amended (the "1933
Act"), and Holder has no present intention of selling, granting any
participation in, or otherwise distributing this Note in violation of the 1933
Act.

                  (b) Holder acknowledges that it can bear the economic risk of
complete loss of its investment in this Note and has such knowledge and
experience in financial or business matters that it is capable of evaluating the
merits and risks of the investment in this Note. Holder acknowledges that there
are substantial risks incident to the ownership of this Note, and such
investment is speculative and involves a high degree of risk of loss by Holder
of Holder's entire investment in the Issuer

                  (c) Holder has had an opportunity to receive all information
related to Issuer requested and to ask questions of and receive answers from
Issuer regarding Issuer and its business. Holder has reviewed the reports and
other documents filed by Issuer with the Securities and Exchange Commission.

                  (d) Holder acknowledges and understands that this Note is a
"restricted security" under the 1933 Act.

                  (e) Holder is an "accredited investor" as defined by Rule 501
or Regulation D promulgated under the 1933 Act.

                                      -3-
<PAGE>

            9. No Waiver. No extension of time for payment of any amount owing
hereunder shall affect the liability of Issuer or any person or entity, now or
at any time hereafter, liable for payment of the indebtedness evidenced hereby.
No delay by Holder in exercising any power or right hereunder shall operate as a
waiver of any power or right hereunder.

            10. Attorneys' Fees. If any action or proceeding is brought by
Holder to enforce payment of this Note, then the prevailing party shall be
entitled to recover its reasonable costs and expenses (including without
limitation attorneys' fees, experts fees, etc.) associated therewith. In
addition, upon the payment in full of the Principal Amount, Issuer agrees to pay
to Holder the reasonable legal fees, not to exceed $15,000, incurred by MedCap
Partners L.P. in connection with the review and preparation of this Note and the
Security Agreement and any related filings to protect Holder's security
interests.

            11. Waiver of Presentment, etc. Each Issuer, for itself and its
respective successors and assigns, hereby expressly waive presentment, demand,
protest, notice of protest, dishonor, notice of dishonor and any other notice of
any type or nature. No waiver or modification of the terms of this Note shall be
valid unless in writing and signed by the holder hereof.

            12. Severability. If any provision of this Note is held invalid or
unenforceable by any court of competent jurisdiction, the other provisions of
this Note shall remain in full force and effect. Any provision of this Note held
invalid or unenforceable only in part or degree shall remain in full force and
effect to the extent not held invalid or unenforceable.

            13. Time of Essence. Time is of the essence with regard to all dates
set forth in this Note.

            14. Assignment and Transfer. No Issuer may assign or otherwise
transfer its rights or obligations under this Note without the prior written
consent of Holder. Any purported assignment or transfer in contravention of this
paragraph 14 shall be null and void. Subject to the foregoing, this Note shall
be binding upon the successors and assigns of Issuer, and shall inure to the
benefit of and be enforceable by the successors and assigns of Holder. Holder
agrees that it shall not transfer this Note (a) in violation of the 1933 Act or
any state securities laws and (b) unless pursuant to an effective registration
statement or an exemption from such registration statement requirements.

            15. Governing Law. This Note shall be construed in accordance with
and governed by the laws of the State of California, without regard to conflict
of laws principles.
                            [signature pages follow]

                                      -4-
<PAGE>

            IN WITNESS WHEREOF, the undersigned have executed this Note as of
the date first written above.

                                        CRDENTIA CORP.

                                        By: /s/ James D. Durham

                                        Name:________________________

                                        Title:__________________________

                                        BAKER ANDERSON CHRISTIE, INC.

                                        By: /s/ James D. Durham

                                        Name:_______________________________

                                        Title:________________________________

                                        NURSES NETWORK, INC.

                                        By: /s/ James D. Durham

                                        Name:_______________________________

                                        Title:________________________________

                                      -5-
<PAGE>

                                        NEW AGE STAFFING, INC.

                                        By: /s/ James D. Durham

                                        Name:_______________________________

                                        Title:________________________________

                                        PSR NURSES, LTD.

                                        By: /s/ James D. Durham

                                        Its:  General Partner

                                        By:_________________________________

                                        Name:_______________________________

                                        Title:________________________________

                                        PSR NURSE RECRUITING, INC.

                                        By: /s/ James D. Durham

                                        Name:_______________________________

                                        Title:________________________________

                                        PSR NURSES HOLDINGS CORP.

                                        By: /s/ James D. Durham

                                        Name:_______________________________

                                        Title:________________________________

                                      -6-
<PAGE>

                                        CRDE CORP.

                                        By: /s/ James D. Durham

                                        Name:_______________________________

                                        Title:________________________________

                                        ARIZONA HOME HEALTH CARE/PRIVATE DUTY,
                                        INC.

                                        By: /s/ James D. Durham

                                        Name:_______________________________

                                        Title:________________________________

                                        CARE PROS STAFFING, INC.

                                        By: /s/ James D. Durham

                                        Name:_______________________________

                                        Title:________________________________

                                      -7-
<PAGE>

Acknowledged and Agreed to:

MEDCAP PARTNERS L.P.

By:  MedCap Management & Research LLC
Its: General Partner

By:  /s/ C. Fred Toney
     ----------------------
     Name:  C. Fred Toney
     Title: Managing Member

                                      -8-

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