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Stretching vibration influence of the hydrogen bond on a localized excitation and thermodynamic properties of DNA double helices

✍ Scribed by Ling-Yun Zhang; Hong Sun; Jia-Tih Lin

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
208 KB
Volume
259
Category
Article
ISSN
0375-9601

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✦ Synopsis

The propagation of a localized excitation and the thermodynamic properties in DNA double helices due to stretching vibration of hydrogen bond are discussed. The stretch of the hydrogen bonds is considered as a nonlinear chain with cubic and quartic potential. The analytic solution of the solitary wave is obtained by using the continuum approximation and its stability has been discussed. With the help of the thermodynamic Green function technique, the temperature and anharmonicity effects on the thermodynamic properties of DNA are investigated. The theoretical calculation of the specific heat in DNA at low temperature is consistent with the experimental result. The numerical simulation of the differential-difference equation shows that the solitary wave is pinned by the lattice. It is also pointed out that the conformatioal transitions from B-DNA to A-DNA can occur in the case of asymmetry potential with quartic term.

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