<PAGE>   1
                                                                      Exhibit 24



                                POWER OF ATTORNEY



         KNOW BY ALL MEN BY THESE PRESENTS, that the undersigned director of
Demegen, Inc., a Colorado Corporation, does make, constitute and appoint RICHARD
D. EKSTROM, with full power and authority his true and lawful attorney-in-fact
and agent, for him and his name, place and stead in any and all capacities, to
sign the Annual Report of Demegen, Inc. on Form 10-KSB for the year ended
September 30, 2000, and to file such Annual Report, so signed, with all exhibits
thereto, with the Securities and Exchange Commission, hereby further granting
unto said attorney-in-fact full power and authority to do and perform any and
all acts and things requisite and necessary to be done in and about the premises
as fully to all intents and purposes as he might or could do in person; the
undersigned hereby ratifies and confirms all that said attorney and agent, shall
do or cause to be done by virtue hereof.


         IN WITNESS WHEREOF, THE UNDERSIGNED HAS HEREUNTO SET HIS HAND AND SEAL
THIS 14th day of December, 2000.







   /s/ James Colker   (SEAL)
----------------------
James Colker, Director



<PAGE>   2




                                POWER OF ATTORNEY



         KNOW BY ALL MEN BY THESE PRESENTS, that the undersigned director of
Demegen, Inc., a Colorado Corporation, does make, constitute and appoint RICHARD
D. EKSTROM, with full power and authority his true and lawful attorney-in-fact
and agent, for him and his name, place and stead in any and all capacities, to
sign the Annual Report of Demegen, Inc. on Form 10-KSB for the year ended
September 30, 2000, and to file such Annual Report, so signed, with all exhibits
thereto, with the Securities and Exchange Commission, hereby further granting
unto said attorney-in-fact full power and authority to do and perform any and
all acts and things requisite and necessary to be done in and about the premises
as fully to all intents and purposes as he might or could do in person; the
undersigned hereby ratifies and confirms all that said attorney and agent, shall
do or cause to be done by virtue hereof.


         IN WITNESS WHEREOF, THE UNDERSIGNED HAS HEREUNTO SET HIS HAND AND SEAL
THIS 14th day of December, 2000






    /s/ Robert E. Hannan  (SEAL)
--------------------------
Robert E. Hannan, Director




<PAGE>   3







                                POWER OF ATTORNEY



         KNOW BY ALL MEN BY THESE PRESENTS, that the undersigned director of
Demegen, Inc., a Colorado Corporation, does make, constitute and appoint RICHARD
D. EKSTROM, with full power and authority his true and lawful attorney-in-fact
and agent, for him and his name, place and stead in any and all capacities, to
sign the Annual Report of Demegen, Inc. on Form 10-KSB for the year ended
September 30, 2000, and to file such Annual Report, so signed, with all exhibits
thereto, with the Securities and Exchange Commission, hereby further granting
unto said attorney-in-fact full power and authority to do and perform any and
all acts and things requisite and necessary to be done in and about the premises
as fully to all intents and purposes as he might or could do in person; the
undersigned hereby ratifies and confirms all that said attorney and agent, shall
do or cause to be done by virtue hereof.


         IN WITNESS WHEREOF, THE UNDERSIGNED HAS HEREUNTO SET HIS HAND AND SEAL
THIS 14th day of December, 2000.







        /s/ Jerry B. Hook          (SEAL)
----------------------------------
Jerry B. Hook, Ph.D., Director



<PAGE>   4



                                POWER OF ATTORNEY



         KNOW BY ALL MEN BY THESE PRESENTS, that the undersigned director of
Demegen, Inc., a Colorado Corporation, does make, constitute and appoint RICHARD
D. EKSTROM, with full power and authority his true and lawful attorney-in-fact
and agent, for him and his name, place and stead in any and all capacities, to
sign the Annual Report of Demegen, Inc. on Form 10-KSB for the year ended
September 30, 2000, and to file such Annual Report, so signed, with all exhibits
thereto, with the Securities and Exchange Commission, hereby further granting
unto said attorney-in-fact full power and authority to do and perform any and
all acts and things requisite and necessary to be done in and about the premises
as fully to all intents and purposes as he might or could do in person; the
undersigned hereby ratifies and confirms all that said attorney and agent, shall
do or cause to be done by virtue hereof.


         IN WITNESS WHEREOF, THE UNDERSIGNED HAS HEREUNTO SET HIS HAND AND SEAL
THIS 14th day of December, 2000.







        /s/ Jesse M. Jaynes     (SEAL)
--------------------------------
Jesse M. Jaynes, Ph.D., Director




<PAGE>   5



                                POWER OF ATTORNEY



         KNOW BY ALL MEN BY THESE PRESENTS, that the undersigned director of
Demegen, Inc., a Colorado Corporation, does make, constitute and appoint RICHARD
D. EKSTROM, with full power and authority his true and lawful attorney-in-fact
and agent, for him and his name, place and stead in any and all capacities, to
sign the Annual Report of Demegen, Inc. on Form 10-KSB for the year ended
September 30, 2000, and to file such Annual Report, so signed, with all exhibits
thereto, with the Securities and Exchange Commission, hereby further granting
unto said attorney-in-fact full power and authority to do and perform any and
all acts and things requisite and necessary to be done in and about the premises
as fully to all intents and purposes as he might or could do in person; the
undersigned hereby ratifies and confirms all that said attorney and agent, shall
do or cause to be done by virtue hereof.


         IN WITNESS WHEREOF, THE UNDERSIGNED HAS HEREUNTO SET HIS HAND AND SEAL
THIS 14th day of December, 2000.






    /s/ John Bridwell  (SEAL)
-----------------------
John Bridwell, Director









<PAGE>   6




                                POWER OF ATTORNEY



         KNOW BY ALL MEN BY THESE PRESENTS, that the undersigned director of
Demegen, Inc., a Colorado Corporation, does make, constitute and appoint RICHARD
D. EKSTROM, with full power and authority his true and lawful attorney-in-fact
and agent, for him and his name, place and stead in any and all capacities, to
sign the Annual Report of Demegen, Inc. on Form 10-KSB for the year ended
September 30, 2000, and to file such Annual Report, so signed, with all exhibits
thereto, with the Securities and Exchange Commission, hereby further granting
unto said attorney-in-fact full power and authority to do and perform any and
all acts and things requisite and necessary to be done in and about the premises
as fully to all intents and purposes as he might or could do in person; the
undersigned hereby ratifies and confirms all that said attorney and agent, shall
do or cause to be done by virtue hereof.


         IN WITNESS WHEREOF, THE UNDERSIGNED HAS HEREUNTO SET HIS HAND AND SEAL
THIS 14th day of December, 2000.







      /s/ Konrad M. Weis       (SEAL)
-------------------------------
Konrad M. Weis, Ph.D., Director