Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 1 de 1
Filtrar
Mais filtros











Base de dados
Assunto principal
Intervalo de ano de publicação
1.
Phys Rev E Stat Nonlin Soft Matter Phys ; 70(2 Pt 2): 026213, 2004 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-15447571

RESUMO

We study energy localization on the oscillator chain proposed by Peyrard and Bishop to model DNA. We search numerically for conditions with initial energy in a small subgroup of consecutive oscillators of a finite chain and such that the oscillation amplitude is small outside this subgroup on a long time scale. We use a localization criterion based on the information entropy and verify numerically that such localized excitations exist when the nonlinear dynamics of the subgroup oscillates with a frequency inside the reactive band of the linear chain. We predict a mimium value for the Morse parameter (micro>2.25) (the only parameter of our normalized model), in agreement with the numerical calculations (an estimate for the biological value is micro=6.3 ). For supercritical masses, we use canonical perturbation theory to expand the frequencies of the subgroup and we calculate an energy threshold in agreement with the numerical calculations.


Assuntos
Biofísica/métodos , DNA/química , Modelos Estatísticos , Modelos Teóricos , Conformação de Ácido Nucleico , Oscilometria
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA