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Effective tension and fluctuations in active membranes

Bastien Loubet1, Udo Seifert2, and Michael Andersen Lomholt1

  • 1Department of Physics, MEMPHYS - Center for Biomembrane Physics, Chemistry and Pharmacy, University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark
  • 2Universität Stuttgart, II. Institut für Theoretische Physik, Pfaffenwaldring 57/III, D-70550 Stuttgart, Germany

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Phys. Rev. E 85, 031913 – Published 23 March, 2012

DOI: https://doi.org/10.1103/PhysRevE.85.031913

Abstract

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.

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Phys. Rev. E 85, 031913– Published 23 March, 2012
  • Received 9 December 2011

©2012 American Physical Society

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