Effective tension and fluctuations in active membranes.

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 constraints on the membrane area and the volume of fluid that it encapsulates into account when obtaining expressions for the dependency of the membrane tension on the noise. We then investigate three possible origins of the nonthermal 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.

• Publication year

  2011

• Venue

  Physical review. E, Statistical, nonlinear, and soft matter physics

• Publication date

  2011-12-13

• Fields of study

  Materials Science, Medicine, Physics

• Identifiers
  DOI 10.1103/PhysRevE.85.031913arXiv 1112.2919PMID 22587129
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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