Effective tension and fluctuations in active membranes

Details Effective tension and fluctuations in active membranes Effective tension and fluctuations in active membranes

2011-12-13

arxiv.org/abs/1112.2919v2

Physics

Condensed Matter

Soft Condensed Matter

9 pages, 4 figures, 1 table, 1 supplementary material

Scientific paper

We calculate the fluctuation spectrum of the shape of a lipid vesicle or cell exposed to a nonthermal source of noise. In particular we take into account constraints on the membrane area and the volume of fluid that it encapsulates when obtaining expressions for the dependency of the membrane tension on the noise. We then investigate three possible origins of the non-thermal noise taken from the literature: A direct force, which models an external medium pushing on the membrane. A curvature force, which models a fluctuating spontaneous curvature, and a permeation force coming from an active transport of fluid through the membrane. For the direct force and curvature force cases, we compare our results to existing experiments on active membranes.

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