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| - Effect of Undulations on Surface Tension in Simulated Bilayers
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| Abstract
| - To understand the effect of the finite size of simulation cells on the equilibrium properties of bilayers, anextensive series of glycerolmonoolein bilayer molecular dynamics simulations in which the surface area andsystem size were systematically changed have been conducted. Systems ranging from 200 to 1800 lipidswere simulated, covering length scales up to 20 nm. The dependence of the surface tension on the area perlipid is shown, although long simulation times were needed (up to 40 ns) to obtain reliable estimates. As thesize of simulated patches increases, long wavelength undulatory modes appear with a concomitant increasein the area compressibility due to coupling of undulation modes to area fluctuations. Both the undulatoryintensities and the peristaltic intensities of the bilayer fluctuations can be fitted in the long wavelength limitto continuum model predictions. The effect of system size on surface tension appears to depend on the stressconditions.
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