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AKB: Biologische Physik
AKB 15: Biopolymers II
AKB 15.2: Talk
Tuesday, March 28, 2006, 16:45–17:00, ZEU 260
Hydrodynamic interactions for stiff polymers — •Jens Glaser1, Oskar Hallatschek2, and Klaus Kroy1 — 1Institut für theoretische Physik, Universität Leipzig, PF 100 920, 04009 Leipzig — 2Harvard University, Lyman Laboratory, Cambridge MA 02138
The minimal model for the statics and dynamics of stiff polymers such as the polymers of the cytoskeleton is the wormlike chain. For quantitative predictions of wormlike chain dynamics non-local hydrodynamic interactions (HI) have to be taken into account. The importance of a correct treatment of HI is discussed for the short- and long-time limits of the dynamic structure factor. The results are compared with those of recent dynamic light scattering experiments, e.g. for actin. For extracting consistent and reliable values of the model parameters (persistence length and the backbone thickness) inclusion of HI on the Rotne-Prager level is found to be necessary and sufficient. As another example, a stiff polymer under the influence of a constant external force field, e.g. gravity, is discussed. HI induces a spontaneous symmetry breaking. The corresponding conformational dynamics is analyzed analytically.