Stretching a heteropolymer

Publication Type:

Journal Article

Source:

EUROPHYSICS LETTERS, E D P SCIENCES, Volume 42, Number 1, 7, AVE DU HOGGAR, PARC D ACTIVITES COURTABOEUF, BP 112, F-91944 LES ULIS CEDEXA, FRANCE, p.97-102 (1998)

Keywords:

BINDING; DNA-MOLECULES; ELASTICITY

Abstract:

We study the influence of some quenched disorder in the sequence of monomers on the entropic elasticity of long polymeric chains. Starting from the Kratky-Porod model, we show numerically that some randomness in the favoured angles between successive segments induces a change in the elongation vs. force characteristics, and this change can be well described by a sample renormalisation of the elastic constant. The effective coupling constant is computed by an analytic study of the low-force regime.