Asymmetry of the propagation of conformational excitations in a double-strand DNA molecule
A very simple model describing the conformational degrees of freedom of a double-strand DNA molecule is proposed. It is shown that the characteristic modes of the model consist of an acoustic (longitudinal with respect to the axis of the double helix) and two transverse optical modes. The latter modes are directly related with the deformations of the ideal structure of the double helix, which necessarily leads to softening of one of the optical modes on a finite wave vector. It is found that the conformational excitations propagating in DNA are asymmetric.
PACS numbers87.15.Gg 87.15.He
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