  The nonlinear excitations induced in DNA by external force are considered on
the basis of Peyrard-Bishop-Dauxois model. It is shown that such impact can
lead to creation of bubbles which can propogate through the molecule. The
interaction of such bubbles with an excess electron or hole is considered. The
numerical experiments demonstrate the possibility of charge transfer induced by
bubbles. The possible applications of the obtained results in
nanobioelectronics are discussed.
