Exhibit
24.3
POWER
OF
ATTORNEY
KNOW
ALL
MEN BY THESE PRESENTS, that the person's name whose signature appears below
constitutes and appoints Marc W. Eller and Douglas P. Baker, and each of
either
of them, his true and lawful attorney-in-fact and agent, with full power
of
substitution and resubstitution, for him and in his name, place and stead,
in
any and all capacities, to sign any and all amendments (including post-effective
amendments) to this Registration Statement on Form S-2 and any subsequent
registration statements relating to the offering to which this Registration
Statement relates, and to file the same, with all exhibits thereto and other
documents in connection therewith, with the Securities and Exchange Commission,
granting unto said attorneys-in-fact and agents, and each of them, full power
and authority to do and perform each and every act and thing requisite and
necessary to be done in and about the premises, as fully and to intents and
purposes as he might or could do in person, hereby ratifying and confirming
all
that said attorneys-in-fact and agents or either of them, or their or his
substitutes or substitute, may lawfully do or cause to be done by virtue
hereof.
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/s/
Charles C. Bailey
Charles
C. Bailey
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