  Dynamical equations for a polaron and bipolaron in a DNA duplex are obtained
on the basis of Holstein-Hubbard Hamiltonian. It is shown that in a PolyA/PolyT
duplex especially stable is a bipolaron state in which holes are localized on
different chains of the duplex. With the use of the polaron and bipolaron free
energy, the temperature of bipolaron decay is found to be T_d \approx 350 K
which can serve as an approximate estimate of the superconducting transition
temperature. The way of constructing superconducting nanowires on the basis of
DNA is suggested.
