publication . Preprint . Article . 2011

Effective tension and fluctuations in active membranes

Michael A. Lomholt; Udo Seifert; Bastien Loubet;
Open Access English
  • Published: 13 Dec 2011
  • Country: Denmark
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 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 curvat...
Subjects
arXiv: Quantitative Biology::Subcellular ProcessesPhysics::Biological PhysicsQuantitative Biology::Cell Behavior
free text keywords: Condensed Matter - Soft Condensed Matter, Physics - Biological Physics, Statistics and Probability, Statistical and Nonlinear Physics, Condensed Matter Physics, Volume of fluid method, Membrane fluidity, Materials science, Mechanics, Surface tension, Membrane, Permeation, Curvature, Fluctuation spectrum, Cell membrane, medicine.anatomical_structure, medicine, Classical mechanics
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