  We discuss the possibility of controlling biological systems, by exciting in
the near infrared region {\it hybrid} metallic nanotube ropes, dressed with
proteins and embedded in the biosystems. If one nanotube, in a double-tube
rope, is filled with metallofullerenes and the other is empty, the two tubes
change their opposite equilibrium charging during the irradiation. The
resulting change of the local electric field can deform proteins attached to
the tubes, and change their catalytic properties.
