title: Soliton-like excitation in a nonlinear model of DNA dynamics with viscosity.
abstract: The study of solitary wave solutions is of prime significance for nonlinear physical systems. The Peyrard-Bishop model for DNA dynamics is generalized specifically to include the difference among bases pairs and viscosity. The small amplitude dynamics of the model is studied analytically and reduced to a discrete complex Ginzburg-Landau (DCGL) equation. Exact solutions of the obtained wave equation are obtained by the mean of the extended Jacobian elliptic function approach. These amplitude solutions are made of bubble solitons. The propagation of a soliton-like excitation in a DNA is then investigated through numerical integration of the motion equations. We show that discreteness can drastically change the soliton shape. The impact of viscosity as well as elasticity on DNA dynamic is also presented. The profile of solitary wave structures as well as the energy which is initially evenly distributed over the lattice are displayed for some fixed parameters.
authors.affiliation: Laboratory of Mechanics, Department of Physics, Faculty of Science, University of Yaounde I, P. O. Box 812, Yaounde, Cameroon. contab408@yahoo.com
authors.forename: Conrad Bertrand
authors.initials: CB
authors.lastname: Tabi
authors.forename: Alidou
authors.initials: A
authors.lastname: Mohamadou
authors.forename: Timoleon Crepin
authors.initials: TC
authors.lastname: Kofane
mesh_terms: D003198:Computer Simulation; D004247:DNA / Q000737:chemistry* / Q000648:ultrastructure*; D008956:Models, Chemical; D008958:Models, Molecular; D017711:Nonlinear Dynamics; D009690:Nucleic Acid Conformation; D013314:Stress, Mechanical; D014783:Viscosity
chemical_list: D004247:DNA