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AKB: Biologische Physik

AKB 7: Biopolymers I

AKB 7.3: Vortrag

Dienstag, 28. März 2006, 10:30–10:45, ZEU 255

Actin Filaments Confined in Microchannels — •Patrick Levi and Klaus Mecke — Institut fuer Theoretische Physik I, Universitaet Erlangen-Nuernberg, Staudtstrasse 7, 91058 Erlangen, Germany

The statistical physics of semiflexible polymers in confined geometries faces the problem of treating bending modes in non-parabolic potentials. We present an analytic expression for the distribution of the end-to-end distance in a parabolic potential. Our result is in good agreement with experimental data for hard wall confinement in rectangularly shaped microchannels. For non-parabolic potentials we developed a selfconsistent ansatz for mapping the wall distance of a rectangular channel to an effective parabolic potential strength. Deviations from the Odijk result for the correlation function in a parabolic potential are discussed. The selfconsistent approach is also used to calculate forces on the filaments in inhomogeneous channel geometries.