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BP: Fachverband Biologische Physik
BP 7: Poster I
BP 7.6: Poster
Monday, March 23, 2009, 17:45–20:00, P3
Influence of Tension on Coarse-Grained Model Membranes — •Jörg M. Neder1, Beate West2, Friederike Schmid2, and Peter Nielaba1 — 1Department of Physics, University of Konstanz, 78457 Konstanz — 2Department of Physics, University of Bielefeld, 33615 Bielefeld
Using a recently developed generic coarse-grained model for lipid bilayers [1] we investigate the effect of an applied tension on these systems at different temperatures. The recorded pressure profiles of the systems are consistent with the external tension. We observe a lowered extensibility of the bilayer in the gel phase compared to the fluid phase. In the region of the phase transition, where our system is in the ripple phase, both regimes of area compressibility are present: the fluid-like behavior for lower tensions and the gel-like decreased extensibility at higher tensions. The effect of laterally lowered pressure on properties of simple model proteins and the surrounding bilayer is examined. Further, the influence of tension on the effective interaction potential of two cylindrical inclusions (cf. [2]) is analyzed via umbrella sampling. An extension of the elastic theory presented in [3] is used to fit fluctuation spectra of both height and thickness of stressed membranes.
[1] O. Lenz and F. Schmid, Phys. Rev. Lett. 98, 058104 (2007)
[2] B. West et al., Biophys. J., doi:10.1529/biophysj.108.138677 (2009)
[3] G. Brannigan and F. H. L. Brown, Biophys. J. 90, 1501 (2006)