Document:

Exhibit 4.2

THE WARRANTS  REPRESENTED BY THIS  CERTIFICATE AND THE SECURITIES  ISSUABLE UPON
EXERCISE  THEREOF HAVE NOT BEEN REGISTERED  UNDER THE SECURITIES ACT OF 1933, AS
AMENDED  (THE  "ACT"),  AND MAY NOT BE OFFERED OR SOLD EXCEPT (i) PURSUANT TO AN
EFFECTIVE  REGISTRATION  STATEMENT UNDER THE ACT, (ii) TO THE EXTENT APPLICABLE,
PURSUANT TO RULE 144 UNDER SUCH ACT (OR ANY SIMILAR RULE UNDER SUCH ACT RELATING
TO THE DISPOSITION OF  SECURITIES),  OR (iii) UPON THE DELIVERY BY THE HOLDER TO
THE COMPANY OF AN OPINION OF COUNSEL, REASONABLY SATISFACTORY TO COUNSEL FOR THE
COMPANY,  STATING  THAT  AN  EXEMPTION  FROM  REGISTRATION  UNDER  SUCH  ACT  IS
AVAILABLE.

               EXERCISABLE FROM MARCH 1, 2004 UNTIL ON OR BEFORE
                  5:00 P.M., NEW YORK TIME, FEBRUARY 28, 2009

No.                                                                     Warrants
   ---                                                     -------------

                               NANOSENSORS, INC.

                                    WARRANT

      This warrant certificate (the "Warrant Certificate") certifies that or
registered assigns, is the registered holder of warrants to purchase from
Nanosensors, Inc., a Nevada corporation (the "Company") at any time from March
1, 2004, until 5:00 P.M. New York City time on February 28, 2009, (the
"Expiration Date"), up to fully-paid and non-assessable shares, subject to
adjustment in accordance with Article 5 hereof (the "Warrant Shares"), of the
common stock (the "Common Stock"), par value $.001 par value, of the Company,
subject to the terms and conditions set forth herein. The warrants represented
by this Warrant Certificate and any warrants resulting from a transfer or
subdivision of the warrants represented by this Warrant Certificate shall
sometimes hereinafter be referred to, individually, as a "Warrant" and,
collectively, as the "Warrants."

      1. Exercise of Warrants.

      1.1 Exercise Procedure. Each Warrant is initially exercisable to purchase
one Warrant Share at an initial exercise price per Warrant Share of $.25,
subject to adjustment as set forth in Article 5 hereof, payable in cash or by
check to the order of the Company, or any combination of cash or check. Upon
surrender of this Warrant Certificate with the annexed Form of Election to
Purchase duly executed, together with payment of the Exercise Price (as
hereinafter defined) for the Warrant Shares purchased, at the Company's
principal offices (presently located at 1800 Wyatt Drive, Santa Clara,
California 95054), the registered holder of the Warrant Certificate ("Holder" or
"Holders") shall be entitled to receive a certificate or certificates for the
Warrant Shares so purchased.

<PAGE>

      Payment of the Exercise Price may also be made in shares of Common Stock
of the Company having a "Market Value" on the date of exercise equal to the
aggregate exercise price, or in a combination of cash and stock (including for
these purposes a reduction in the number of shares to be issued upon exercise by
applying the a number of the shares to the purchase price) For these purposes,
the "Market Value" per share of Common Stock shall be: (i) if the Stock is
traded on a national securities exchange or on the Nasdaq National Market System
("NMS"), the per share closing price of the Stock on the principal securities
exchange on which they are listed or on NMS, as the case may be, on the date of
exercise (or if there is no closing price for such date of exercise, then the
last preceding business day on which there was a closing price); or (ii) if the
Stock is traded in the over-the-counter market and quotations are published on
the Nasdaq quotation system (but not on NMS), the closing bid price of the Stock
on the date of exercise as reported by Nasdaq (or if there are no closing bid
prices for such date of exercise, then the last preceding business day on which
there was a closing bid price); or (iii) if the Stock is traded in the
over-the-counter market but bid quotations are not published on Nasdaq, the
closing bid price per share for the Stock as furnished by a broker-dealer which
regularly furnishes price quotations for the Stock; or (iv) if the Stock is not
traded on any exchange or Nasdaq and if quotes are not available, the fair
market value as determined in good faith by the Board of Directors.

      1.2. Vesting Period. The purchase rights represented by this Warrant
Certificate are exercisable at the option of the Holder hereof, in whole or in
part commencing on March 1, 2004.

      1.3. Partial Exercise; New Warrant. In the case of the purchase of less
than all the Warrant Shares purchasable under this Warrant Certificate, the
Company shall cancel this Warrant Certificate upon the surrender thereof and
shall execute and deliver a new Warrant Certificate of like tenor for the
balance of the Warrant Shares purchasable hereunder.

      2. Issuance of Certificates. Upon the exercise of the Warrants, the
issuance of certificates for the Warrant Shares purchased pursuant to such
exercise shall be made forthwith without charge to the Holder thereof including,
without limitation, any tax which may be payable in respect of the issuance
thereof, and such certificates shall (subject to the provisions of Article 3
hereof) be issued in the name of, or in such names as may be directed by, the
Holder thereof; provided, however, that the Company shall not be required to pay
any tax which may be payable in respect of any transfer involved in the issuance
and delivery of any such certificates in a name other than that of the Holder
and the Company shall not be required to issue or deliver such certificates
unless or until the person or persons requesting the issuance thereof shall have
paid to the Company the amount of such tax or shall have established to the
satisfaction of the Company that such tax has been paid.

                                      -2-
<PAGE>

      The Warrant Certificates and, upon exercise of the Warrants, the
certificates representing the Warrant Shares shall be executed on behalf of the
Company by the manual or facsimile signature of those officers required to sign
such certificates under applicable law.

      3. Restricted Shares; Registration Rights.

      3.1 Restricted Shares upon Exercise. This Warrant Certificate and, upon
exercise of the Warrants, in part or in whole, certificates representing the
Warrant Shares shall bear a legend substantially similar to the following:

      "The securities represented by this certificate have not been
      registered under the Securities Act of 1933, as amended ("Act"), and
      may not be offered or sold except (i) pursuant to an effective
      registration statement under the Act, (ii) to the extent applicable,
      pursuant to Rule 144 under the Act (or any similar rule under such
      Act relating to the disposition of securities), or (iii) upon the
      delivery by the holder to the Company of an opinion of counsel,
      reasonably satisfactory to counsel to the issuer, stating that an
      exemption from registration under such Act is available."

      3.2 Restriction on Transfer of Warrants. The Holder of this Warrant
Certificate, by its acceptance thereof, covenants and agrees that the Warrants
and the Warrant Shares issuable upon exercise of the Warrants are being acquired
as an investment and not with a view to the distribution thereof and that the
Warrants and the Warrant Shares may not be transferred unless such securities
are either registered under the Act and any applicable state securities law or
an exemption from such registration is available. The Holder of this Warrant
Certificate acknowledges that the Holder has been provided with an opportunity
to ask questions of representatives of the Company concerning the Company and
that all such questions were answered to the satisfaction of the Holder. In
connection with any purchase of Warrant Shares the Holder agrees to execute any
documents which may be reasonably required by counsel to the Company to comply
with the provisions of the Act and applicable state securities laws.

      3.3. Registration Rights. The Company agrees to include, on a one time
basis, in any registration statement filed by the Company after the date hereof
(excluding registration statements on Form S-4 in connection with any merger or
acquisition) the shares underlying this Warrant to allow the resale of such
shares by the Holder under the federal securities laws. Any such registration
statement shall be at the cost and expense of the Company, except for fees of
counsel to the Holder and any underwriting or sales commissions with respect to
Holder's shares. The Company shall provide the Holder with at least 15 days
written notice of its intent to file a registration statement with the
Securities and Exchange Commission. The Company agrees to use its best efforts
to have the registration statement declared effective as soon as possible, but
the Company shall have the right, in its sole discretion, to terminate the
filing at any time prior to its effectiveness. The Company further agrees to use
its best efforts to maintain the effectiveness of such registration statement
for at least nine months from the effective date. The Company shall provide the
holder with such numbers of prospectuses as the holder may reasonably request in
connection with the sale of any shares pursuant to the registration statement.

                                      -3-
<PAGE>

      The Holder shall provide any such information as may be reasonably
required by the Company in connection with the registration statement regarding
the Holder, including information regarding the Holder's intended method of
resale, amount and nature of shares held and other relevant information. The
Holder hereby agrees to indemnify and hold harmless the Company, its officers,
directors, accountants, agents and employees and any person who controls the
Company within the meaning of Section 15 of the Securities Act of 1933 or
Section 20(a0 of the Securities and Exchange Act of 1934, and any underwriter of
the shares being sold by the Holder against all damages, claims, losses, causes
of action, investigations (and expenses incurred with the foregoing) arising
from any written information provided by the Holder to the Company for specific
inclusion in the registration statement.

      4. Price

            4.1 Initial and Adjusted Exercise Price. The initial exercise price
of each Warrant shall be $.25 per share. The adjusted exercise price shall be
the price which shall result from time to time from any and all adjustments of
the initial exercise price in accordance with the provisions of Article 5
hereof.

            4.2 Exercise Price. The term "Exercise Price" herein shall mean the
initial exercise price or the adjusted exercise price, depending upon the
context.

      5. Adjustments of Exercise Price and Number of Warrant Shares.

            5.1 Subdivision and Combination. In case the Company shall at any
time subdivide or combine the outstanding Common Shares, the Exercise Price
shall forthwith be proportionately decreased in the case of subdivision or
increased in the case of combination.

            5.2 Adjustment in Number of Warrant Shares. Upon each adjustment of
the Exercise Price pursuant to the provisions of this Article 5, the number of
Warrant Shares issuable upon the exercise of each Warrant shall be adjusted to
the nearest full Common Share by multiplying a number equal to the Exercise
Price in effect immediately prior to such adjustment by the number of Warrant
Shares issuable upon exercise of the Warrants immediately prior to such
adjustment and dividing the product so obtained by the adjusted Exercise Price.

                                      -4-
<PAGE>

            5.3 Reclassification, Consolidation, Merger. etc. In case of any
reclassification or change of the outstanding Common Shares (other than a change
in par value, or from par value to no par value, or from no par value to par
value, or as a result of a subdivision or combination), or in the case of any
consolidation of the Company with, or merger of the Company into, another
corporation (other than a consolidation or merger in which the Company is the
surviving corporation and which does not result in any reclassification or
change of the outstanding Common Shares, except a change as a result of a
subdivision or combination of such shares or a change in nominal value, as
aforesaid), or in the case of a sale or conveyance to another corporation of the
property of the Company as an entirety, the Holder shall thereafter have the
right to purchase the kind and number of shares of stock and other securities
and property receivable upon such reclassification, change, consolidation,
merger, sale or conveyance as if the Holder were the owner of the Warrant Shares
issuable upon exercise of the Warrants immediately prior to any such events at a
price equal to the product of (x) the number of Warrant Shares issuable upon
exercise of the Warrants and (y) the Exercise Price in effect immediately prior
to the record date for such reclassification, change, consolidation, merger,
sale or conveyance as if such Holder had exercised the Warrants.

            5.4 Determination of Outstanding Shares. The number of Common Shares
at any one time outstanding shall include the aggregate number of shares issued
or issuable upon the exercise of outstanding options, rights, warrants and upon
the conversion or exchange of outstanding convertible or exchangeable
securities.

      6. Exchange and Replacement of Warrant Certificates. This Warrant
Certificate is exchangeable without expense, upon the surrender hereof by the
registered Holder at the principal executive office of the Company, for a new
Warrant Certificate of like tenor and date representing in the aggregate the
right to purchase the same number of Warrant Shares in such denominations as
shall be designated by the Holder thereof at the time of such surrender.

            Upon receipt by the Company of evidence reasonably satisfactory to
it of the loss, theft, destruction or mutilation of this Warrant Certificate,
and, in case of loss, theft or destruction, of indemnity or security reasonably
satisfactory to it, and reimbursement to the Company of all reasonable expenses
incidental thereto, and upon surrender and cancellation of the Warrants, if
mutilated, the Company will make and deliver a new Warrant of like tenor, in
lieu thereof.

      7. Elimination of Fractional Interests. The Company shall not be required
to issue certificates representing fractions of Common Shares and shall not be
required to issue scrip or pay cash in lieu of fractional interests, it being
the intent of the parties that all fractional interests shall be eliminated by
rounding any fraction up to the nearest whole number of Common Shares.

      8. Reservation of Shares. The Company covenants and agrees that it will at
all times reserve and keep available out of its authorized share capital, solely
for the purpose of issuance upon the exercise of the Warrants, such number of
shares of Common Stock as shall be equal to the number of Warrant Shares
issuable upon the exercise of the Warrants, for issuance upon such exercise, and
that, upon exercise of the Warrants and payment of the Exercise Price therefor,
all Warrant Shares issuable upon such exercise shall be duly and validly issued,
fully paid, nonassessable and not subject to the preemptive rights of any
shareholder.

                                      -5-
<PAGE>

      9. Notices. All notices, requests, consents and other communications
hereunder shall be in writing and shall be deemed to have been duly made when
delivered, or mailed by registered or certified mail, return receipt requested:

            (a) If to a registered Holder of the Warrants, to the address of
such Holder as shown on the books of the Company; or

            (b) If to the Company, to the address set forth in Article 1 of this
Agreement or to such other address as the Company may designate by notice to the
Holders.

      10. Successors. All the covenants and provisions of this Agreement by or
for the benefit of the Company and the Holders inure to the benefit of their
respective successors and assigns hereunder.

      11. Governing Law. This Agreement shall be governed as to validity,
interpretation, construction, effect and in all other respects by the internal
laws of the State of Nevada.

      IN WITNESS WHEREOF, the Company has caused this Warrant to be duly
executed, as of the ___th day of _________, 2004.

                                    NANOSENSORS, INC.

                                    By:
                                          Name: Ted L. Wong
                                          Title: President

Corporate Seal

---------------------
Matthew Zuckerman
Secretary

                                      -6-
<PAGE>

                         [FORM OF ELECTION TO PURCHASE]

            The undersigned hereby irrevocably elects to exercise the right,
represented by this Warrant Certificate, to purchase ________ Warrant Shares and
herewith tenders in payment for such Warrant Shares cash or a check payable to
the order of ______ in the amount of $_________, all in accordance with the
terms hereof. The undersigned requests that a certificate for such Warrant
Shares be registered in the name of , whose address is and that such certificate
be delivered to , _____________________ whose address is ______________________.

      _____ The undersigned hereby elects to utilize the "cashless" exercise
provisions in the Warrant.

Dated:_______________________     Signature:

                                          (Signature must conform in all
                                          respects to name of holder as
                                          specified on the face of the Warrant
                                          Certificate.)

                        (Insert Social Security or Other
                         Identifying Number of Holder)

                                      -7-
<PAGE>

                              [FORM OF ASSIGNMENT]

            (To be executed by the registered holder if such holder
                 desires to transfer the Warrant Certificate.)

            FOR VALUE RECEIVED ________________________ hereby sells, assigns
and transfers unto

                (Please print name and address of transferee)
this Warrant Certificate, together with all right, title and interest therein,
and does hereby irrevocably constitute and appoint , Attorney, to transfer the
within Warrant Certificate on the books of [ issuer], with full power of
substitution.

Dated: __________________

                                    Signature:

                                     ___________________________________________
                                          (Signature must conform in all
                                          respects to name of holder as
                                          specified on the face of the
                                          Warrant Certificate)

_____________________________________
(Insert Social Security or Other
Identifying Number of Assignee)

                                      -8-Exhibit 4.3

THE WARRANTS  REPRESENTED BY THIS  CERTIFICATE AND THE SECURITIES  ISSUABLE UPON
EXERCISE  THEREOF HAVE NOT BEEN REGISTERED  UNDER THE SECURITIES ACT OF 1933, AS
AMENDED  (THE  "ACT"),  AND MAY NOT BE OFFERED OR SOLD EXCEPT (i) PURSUANT TO AN
EFFECTIVE  REGISTRATION  STATEMENT UNDER THE ACT, (ii) TO THE EXTENT APPLICABLE,
PURSUANT TO RULE 144 UNDER SUCH ACT (OR ANY SIMILAR RULE UNDER SUCH ACT RELATING
TO THE DISPOSITION OF  SECURITIES),  OR (iii) UPON THE DELIVERY BY THE HOLDER TO
THE COMPANY OF AN OPINION OF COUNSEL, REASONABLY SATISFACTORY TO COUNSEL FOR THE
COMPANY,  STATING  THAT  AN  EXEMPTION  FROM  REGISTRATION  UNDER  SUCH  ACT  IS
AVAILABLE.

               EXERCISABLE FROM APRIL 26, 2004 UNTIL ON OR BEFORE
                    5:00 P.M., NEW YORK TIME, APRIL 30, 2009

No.                                                       _____________ Warrants
    ----------------------

                               NANOSENSORS, INC.

                                FORM OF WARRANT

      This warrant certificate (the "Warrant Certificate") certifies that or
registered assigns, is the registered holder of warrants to purchase from
NanoSensors, Inc., a Nevada corporation (the "Company") at any time from April
26, 2004, until 5:00 P.M. New York City time on April 30, 2009, (the "Expiration
Date"), up to fully-paid and non-assessable shares, subject to adjustment in
accordance with Article 5 hereof (the "Warrant Shares"), of the common stock
(the "Common Stock"), par value $.001 par value, of the Company, subject to the
terms and conditions set forth herein. The warrants represented by this Warrant
Certificate and any warrants resulting from a transfer or subdivision of the
warrants represented by this Warrant Certificate shall sometimes hereinafter be
referred to, individually, as a "Warrant" and, collectively, as the "Warrants."

      1. Exercise of Warrants.

      1.1 Exercise Procedure. Each Warrant is initially exercisable to purchase
one Warrant Share at an initial exercise price per Warrant Share of $.30,
subject to adjustment as set forth in Article 5 hereof, payable in cash or by
check to the order of the Company, or any combination of cash or check. Upon
surrender of this Warrant Certificate with the annexed Form of Election to
Purchase duly executed, together with payment of the Exercise Price (as
hereinafter defined) for the Warrant Shares purchased, at the Company's
principal offices (presently located at 1800 Wyatt Drive, Santa Clara,
California 95054), the registered holder of the Warrant Certificate ("Holder" or
"Holders") shall be entitled to receive a certificate or certificates for the
Warrant Shares so purchased.

<PAGE>

      Payment of the Exercise Price may also be made in shares of Common Stock
of the Company having a "Market Value" on the date of exercise equal to the
aggregate exercise price, or in a combination of cash and stock (including for
these purposes a reduction in the number of shares to be issued upon exercise by
applying the a number of the shares to the purchase price) For these purposes,
the "Market Value" per share of Common Stock shall be: (i) if the Stock is
traded on a national securities exchange or on the Nasdaq National Market System
("NMS"), the per share closing price of the Stock on the principal securities
exchange on which they are listed or on NMS, as the case may be, on the date of
exercise (or if there is no closing price for such date of exercise, then the
last preceding business day on which there was a closing price); or (ii) if the
Stock is traded in the over-the-counter market and quotations are published on
the Nasdaq quotation system (but not on NMS), the closing bid price of the Stock
on the date of exercise as reported by Nasdaq (or if there are no closing bid
prices for such date of exercise, then the last preceding business day on which
there was a closing bid price); or (iii) if the Stock is traded in the
over-the-counter market but bid quotations are not published on Nasdaq, the
closing bid price per share for the Stock as furnished by a broker-dealer which
regularly furnishes price quotations for the Stock; or (iv) if the Stock is not
traded on any exchange or Nasdaq and if quotes are not available, the fair
market value as determined in good faith by the Board of Directors.

      1.2. Vesting Period. The purchase rights represented by this Warrant
Certificate are exercisable at the option of the Holder hereof, in whole or in
part commencing on April 26, 2004.

      1.3. Partial Exercise; New Warrant. In the case of the purchase of less
than all the Warrant Shares purchasable under this Warrant Certificate, the
Company shall cancel this Warrant Certificate upon the surrender thereof and
shall execute and deliver a new Warrant Certificate of like tenor for the
balance of the Warrant Shares purchasable hereunder.

      2. Issuance of Certificates. Upon the exercise of the Warrants, the
issuance of certificates for the Warrant Shares purchased pursuant to such
exercise shall be made forthwith without charge to the Holder thereof including,
without limitation, any tax which may be payable in respect of the issuance
thereof, and such certificates shall (subject to the provisions of Article 3
hereof) be issued in the name of, or in such names as may be directed by, the
Holder thereof; provided, however, that the Company shall not be required to pay
any tax which may be payable in respect of any transfer involved in the issuance
and delivery of any such certificates in a name other than that of the Holder
and the Company shall not be required to issue or deliver such certificates
unless or until the person or persons requesting the issuance thereof shall have
paid to the Company the amount of such tax or shall have established to the
satisfaction of the Company that such tax has been paid.

                                      -2-
<PAGE>

      The Warrant Certificates and, upon exercise of the Warrants, the
certificates representing the Warrant Shares shall be executed on behalf of the
Company by the manual or facsimile signature of those officers required to sign
such certificates under applicable law.

      3. Restricted Shares; Registration Rights.

      3.1 Restricted Shares upon Exercise. This Warrant Certificate and, upon
exercise of the Warrants, in part or in whole, certificates representing the
Warrant Shares shall bear a legend substantially similar to the following:

      "The securities represented by this certificate have not been
      registered under the Securities Act of 1933, as amended ("Act"), and
      may not be offered or sold except (i) pursuant to an effective
      registration statement under the Act, (ii) to the extent applicable,
      pursuant to Rule 144 under the Act (or any similar rule under such
      Act relating to the disposition of securities), or (iii) upon the
      delivery by the holder to the Company of an opinion of counsel,
      reasonably satisfactory to counsel to the issuer, stating that an
      exemption from registration under such Act is available."

      3.2 Restriction on Transfer of Warrants. The Holder of this Warrant
Certificate, by its acceptance thereof, covenants and agrees that the Warrants
and the Warrant Shares issuable upon exercise of the Warrants are being acquired
as an investment and not with a view to the distribution thereof and that the
Warrants and the Warrant Shares may not be transferred unless such securities
are either registered under the Act and any applicable state securities law or
an exemption from such registration is available. The Holder of this Warrant
Certificate acknowledges that the Holder has been provided with an opportunity
to ask questions of representatives of the Company concerning the Company and
that all such questions were answered to the satisfaction of the Holder. In
connection with any purchase of Warrant Shares the Holder agrees to execute any
documents which may be reasonably required by counsel to the Company to comply
with the provisions of the Act and applicable state securities laws.

      3.3. Registration Rights. The Company agrees to include, on a one time
basis, in any registration statement filed by the Company after the date hereof
(excluding registration statements on Form S-4 in connection with any merger or
acquisition or Form S-8 in connection with employee stock plans) the shares
underlying this Warrant to allow the resale of such shares by the Holder under
the federal securities laws. Any such registration statement shall be at the
cost and expense of the Company, except for fees of counsel to the Holder and
any underwriting or sales commissions with respect to Holder's shares. The
Company shall provide the Holder with at least 15 days written notice of its
intent to file a registration statement with the Securities and Exchange
Commission. The Company agrees to use its best efforts to have the registration
statement declared effective as soon as possible, but the Company shall have the
right, in its sole discretion, to terminate the filing at any time prior to its
effectiveness. The Company further agrees to use its best efforts to maintain
the effectiveness of such registration statement for at least nine months from
the effective date. The Company shall provide the holder with such numbers of
prospectuses as the holder may reasonably request in connection with the sale of
any shares pursuant to the registration statement.

                                      -3-
<PAGE>

      The Holder shall provide any such information as may be reasonably
required by the Company in connection with the registration statement regarding
the Holder, including information regarding the Holder's intended method of
resale, amount and nature of shares held and other relevant information. The
Holder hereby agrees to indemnify and hold harmless the Company, its officers,
directors, accountants, agents and employees and any person who controls the
Company within the meaning of Section 15 of the Securities Act of 1933 or
Section 20(a) of the Securities Exchange Act of 1934, and any underwriter of the
shares being sold by the Holder against all damages, claims, losses, causes of
action, investigations (and expenses incurred with the foregoing) arising from
any written information provided by the Holder to the Company for specific
inclusion in the registration statement.

      4. Price

            4.1 Initial and Adjusted Exercise Price. The initial exercise price
of each Warrant shall be $.30 per share. The adjusted exercise price shall be
the price which shall result from time to time from any and all adjustments of
the initial exercise price in accordance with the provisions of Article 5
hereof.

            4.2 Exercise Price. The term "Exercise Price" herein shall mean the
initial exercise price or the adjusted exercise price, depending upon the
context.

      5. Adjustments of Exercise Price and Number of Warrant Shares.

            5.1 Subdivision and Combination. In case the Company shall at any
time subdivide or combine the outstanding Common Shares, the Exercise Price
shall forthwith be proportionately decreased in the case of subdivision or
increased in the case of combination.

            5.2 Adjustment in Number of Warrant Shares. Upon each adjustment of
the Exercise Price pursuant to the provisions of this Article 5, the number of
Warrant Shares issuable upon the exercise of each Warrant shall be adjusted to
the nearest full Common Share by multiplying a number equal to the Exercise
Price in effect immediately prior to such adjustment by the number of Warrant
Shares issuable upon exercise of the Warrants immediately prior to such
adjustment and dividing the product so obtained by the adjusted Exercise Price.

            5.3 Reclassification, Consolidation, Merger. etc. In case of any
reclassification or change of the outstanding Common Shares (other than a change
in par value, or from par value to no par value, or from no par value to par
value, or as a result of a subdivision or combination), or in the case of any
consolidation of the Company with, or merger of the Company into, another

                                      -4-
<PAGE>

corporation (other than a consolidation or merger in which the Company is the
surviving corporation and which does not result in any reclassification or
change of the outstanding Common Shares, except a change as a result of a
subdivision or combination of such shares or a change in nominal value, as
aforesaid), or in the case of a sale or conveyance to another corporation of the
property of the Company as an entirety, the Holder shall thereafter have the
right to purchase the kind and number of shares of stock and other securities
and property receivable upon such reclassification, change, consolidation,
merger, sale or conveyance as if the Holder were the owner of the Warrant Shares
issuable upon exercise of the Warrants immediately prior to any such events at a
price equal to the product of (x) the number of Warrant Shares issuable upon
exercise of the Warrants and (y) the Exercise Price in effect immediately prior
to the record date for such reclassification, change, consolidation, merger,
sale or conveyance as if such Holder had exercised the Warrants.

            5.4 Determination of Outstanding Shares. The number of Common Shares
at any one time outstanding shall include the aggregate number of shares issued
or issuable upon the exercise of outstanding options, rights, warrants and upon
the conversion or exchange of outstanding convertible or exchangeable
securities.

      6. Exchange and Replacement of Warrant Certificates. This Warrant
Certificate is exchangeable without expense, upon the surrender hereof by the
registered Holder at the principal executive office of the Company, for a new
Warrant Certificate of like tenor and date representing in the aggregate the
right to purchase the same number of Warrant Shares in such denominations as
shall be designated by the Holder thereof at the time of such surrender.

            Upon receipt by the Company of evidence reasonably satisfactory to
it of the loss, theft, destruction or mutilation of this Warrant Certificate,
and, in case of loss, theft or destruction, of indemnity or security reasonably
satisfactory to it, and reimbursement to the Company of all reasonable expenses
incidental thereto, and upon surrender and cancellation of the Warrants, if
mutilated, the Company will make and deliver a new Warrant of like tenor, in
lieu thereof.

      7. Elimination of Fractional Interests. The Company shall not be required
to issue certificates representing fractions of Common Shares and shall not be
required to issue scrip or pay cash in lieu of fractional interests, it being
the intent of the parties that all fractional interests shall be eliminated by
rounding any fraction up to the nearest whole number of Common Shares.

      8. Reservation of Shares. The Company covenants and agrees that it will at
all times reserve and keep available out of its authorized share capital, solely
for the purpose of issuance upon the exercise of the Warrants, such number of
shares of Common Stock as shall be equal to the number of Warrant Shares
issuable upon the exercise of the Warrants, for issuance upon such exercise, and
that, upon exercise of the Warrants and payment of the Exercise Price therefor,
all Warrant Shares issuable upon such exercise shall be duly and validly issued,
fully paid, nonassessable and not subject to the preemptive rights of any
shareholder.

      9. Notices. All notices, requests, consents and other communications
hereunder shall be in writing and shall be deemed to have been duly made when
delivered, or mailed by registered or certified mail, return receipt requested:

                                      -5-
<PAGE>

            (a) If to a registered Holder of the Warrants, to the address of
such Holder as shown on the books of the Company; or

            (b) If to the Company, to the address set forth in Article 1 of this
Agreement or to such other address as the Company may designate by notice to the
Holders.

      10. Successors. All the covenants and provisions of this Agreement by or
for the benefit of the Company and the Holders inure to the benefit of their
respective successors and assigns hereunder.

      11. Governing Law. This Agreement shall be governed as to validity,
interpretation, construction, effect and in all other respects by the internal
laws of the State of Nevada.

      IN WITNESS WHEREOF, the Company has caused this Warrant to be duly
executed, as of the ___ day of April, 2004.

                                    NANOSENSORS, INC.

                                    By:
                                       -----------------------------------------
                                        Name: Ted L. Wong
                                        Title: President

Corporate Seal

---------------------
(WITNESS)

                                      -6-
<PAGE>

                         [FORM OF ELECTION TO PURCHASE]

            The undersigned hereby irrevocably elects to exercise the right,
represented by this Warrant Certificate, to purchase ________ Warrant Shares and
herewith tenders in payment for such Warrant Shares cash or a check payable to
the order of ______ in the amount of $_________, all in accordance with the
terms hereof. The undersigned requests that a certificate for such Warrant
Shares be registered in the name of ___________________, whose address is
___________________________ and that such certificate be delivered to
___________________, whose address is ________________________________

      _____ The undersigned hereby elects to utilize the "cashless" exercise
provisions in the Warrant.

Dated:_________________________      Signature:

                                          (Signature must conform in all
                                          respects to name of holder as
                                          specified on the face of the Warrant
                                          Certificate.)

                        (Insert Social Security or Other
                         Identifying Number of Holder)

                                      -7-
<PAGE>

                              [FORM OF ASSIGNMENT]

            (To be executed by the registered holder if such holder
                 desires to transfer the Warrant Certificate.)

            FOR VALUE RECEIVED ___________________________ hereby sells, assigns
and transfers unto

                  (Please print name and address of transferee) this Warrant
Certificate, together with all right, title and interest therein, and does
hereby irrevocably constitute and appoint _________________________, Attorney,
to transfer the within Warrant Certificate on the books of [ issuer], with full
power of substitution.

Dated: __________________

                                    Signature:

                                    -------------------------------
                                          (Signature must conform in all
                                          respects to name of holder as
                                          specified on the face of the
                                          Warrant Certificate)

-------------------------------
(Insert Social Security or Other
Identifying Number of Assignee)

                                      -8-

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