Phys. Rev. E 76, 021921 (2007)

SCI

Simple combined model for nonlinear excitations in DNA

D. L. Hien, N. T. Nhan, V. Thanh Ngo, and N. A. Viet

We propose a simple model for DNA denaturation bases on the pendulum model of Englander et al. [Proc. Natl. Acad. Sci. U.S.A. 77, 7222 _1980)] and the microscopic model of Peyrard and Bishop [Phys. Rev. Lett. 62, 2755 _1989)], so-called “combined model.” The main parameters of our model are the coupling constant k along each strand, the mean stretching y* of the hydrogen bonds, the ratio of the damping constant and driven force /lambda /F. We show that both the length L of unpaired bases and the velocity v of kinks depend on not only the coupling constant k but also the temperature T. Our results are in good agreement with previous works.

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