Berlin 2008 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 7: Posters I
BP 7.39: Poster
Montag, 25. Februar 2008, 17:00–19:30, Poster A
Model Membranes under Tension — •Jörg Neder1, Beate West2, Friederike Schmid2, and Peter Nielaba1 — 1Department of Physics, University of Konstanz, 78457 Konstanz — 2Department of Physics, University of Bielefeld, 33615 Bielefeld
Recently O. Lenz and F. Schmid [1] introduced a simple coarse-grained model to study lipid layers and their phase transitions. Using an extension of this model we are investigating the influence of an applied surface tension to a bilayer membrane by Monte Carlo simulations. We recorded pressure profiles and calculated the area per lipid as a function of tension for temperatures ranging from the gel phase to the liquid phase of the system. Another aim of our work is the investigation of lipid-mediated interactions between two anchored cylindrically shaped model proteins. We compared the tensionless state to states with non-vanishing surface tension. Our results indicate that the agglomeration behavior of the model proteins is only weakly influenced by an additional tension. We are also working on semi-grand-canonical simulations [2] of lipid bilayers forming tubular objects and the influence of incorporated model proteins on their properties.
[1] O. Lenz and F. Schmid, Phys. Rev. Lett. 98, 058104 (2007)
[2] F. Schmid, et al., Comp. Phys. Comm. 177, 168 (2007)