Regensburg 2007 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 6: Biopolymer Conformation and Dynamics

BP 6.1: Vortrag

Montag, 26. März 2007, 14:30–14:45, H44

Semiflexible polymers: Dependence on ensemble and boundary orientations — •Debasish Chaudhuri — MPIPKS Dresden, Noethnitzer Str. 38, 01187 Dresden

We show that the mechanical properties of a worm-like-chain (WLC) polymer, of contour length L and persistence length λ such that t=L/λ∼ O(1), depend both on the ensemble and the constraint on end-orientations. In the Helmholtz ensemble, multiple minima in the free energy near t=4 persists for all kinds of orientational boundary conditions. The qualitative features of projected probability distribution of end to end vector depend crucially on the embedding dimensions.A mapping of the WLC model, to a quantum particle moving on the surface of an unit sphere, is used to obtain the statistical and mechanical properties of the polymer under various boundary conditions and ensembles. The results show excellent agreement with Monte-Carlo simulations.