Modulational instability and energy localization of twisted DNA with solvent interaction

Journal article

Authors / Editors

Tabi, Condrad

Research Areas

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Publication Details

Author list: Mohamadou A, Toko D, Alim, Tabi CB, Kofane TC

Publisher: World Scientific Publishing

Place: SINGAPORE

Publication year: 2015

Journal: International Journal of Modern Physics B (0217-9792)

Journal acronym: INT J MOD PHYS B

Volume number: 29

Issue number: 8

Number of pages: 17

ISSN: 0217-9792

eISSN: 1793-6578

Languages: English-Great Britain (EN-GB)

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Abstract

We investigate the generation of soliton-like pulses along a DNA chain which takes into account both torsional and solvent interaction effects. Interactions between neighboring base pairs are described by a twist angle. Twisting is essential in the model to capture the importance of nonlinear effects for the thermodynamical properties. The nonlinear dynamics of the DNA is then modeled in the Hamiltonian approach by the generalized Dauxois-Peyrard-Bishop model (combination of several models). We introduce the generalized discrete nonlinear Schrodinger equation describing the dynamics of modulated wave through the twisted DNA with solvent interaction. The modulational instability is studied and we present an analytical expression for the MI gain to show the effects of twist angle on MI gain spectra as well as on stability diagram. With the increase of the twist angle the MI gain decreases then increases. Some interesting MI phenomena appear with an additional new MI region as the twist angle increases. The instability and stability diagrams are also affected. Numerical simulations are carried out to show the validity of the analytical approach. The result is that the initial wave breaks into a train of ultrashort pulses with repetition rates, which are trapped in some sites. The impact of the twist angle is investigated and we obtain that the twist angle affects the dynamics of stable patterns generated through the molecule. Thereafter, we study energy localization in the framework of twisted DNA with solvent interaction. While the twist angle leads to a stronger localization of energy, the solvent interaction delocalizes energy along the molecule.

Keywords

Energy localization, Modulational instability, pulses train, Solvent interaction, twisted DNA

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