Berlin 2008 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 7: Posters I

BP 7.19: Poster

Montag, 25. Februar 2008, 17:00–19:30, Poster A

Nonlinear dynamic response of semiflexible polymers — •Benedikt Obermayer¹, Wolfram Möbius^1,2, Oskar Hallatschek³, Klaus Kroy⁴, and Erwin Frey¹ — ¹Arnold Sommerfeld Center and Center of NanoScience, Ludwig-Maximilians-Universität München, Theresienstr. 37, 80333 München — ²Institut für Theoretische Physik, Universität zu Köln, Zülpicher Str. 77, 50937 Köln — ³Lyman Laboratory of Physics, Harvard University, Cambridge, MA 02138, USA — ⁴Institut für Theoretische Physik, Universität Leipzig, Postfach 100920, 04009 Leipzig

We have theoretically analyzed the anisotropic nonlinear dynamic response of semiflexible polymers to external driving fields. Crossover scaling laws are extracted from a coarse-grained equation of motion that governs the propagation and relaxation of backbone tension and follows from a rigorous perturbation theory. Our analytical results are compared to simulation data for a variety of force protocols. We address explicitly the dependence on boundary conditions and other implications relevant for experiments and computer simulations, such as the influence of finite extensibility and microstructure.