Mechanics of non-planar membranes with force-dipole activity

Details Mechanics of non-planar membranes with force-dipole activity Mechanics of non-planar membranes with force-dipole activity

2005-10-25

arxiv.org/abs/cond-mat/0510671v3

Phys. Rev. E 73, 061913 (2006)

Physics

Condensed Matter

Soft Condensed Matter

11 pages, 2 figures, minor changes and additions

Scientific paper

10.1103/PhysRevE.73.061913

A study is made of how active membrane proteins can modify the long wavelength mechanics of fluid membranes. The activity of the proteins is modelled as disturbing the protein surroundings through non-local force distributions of which a force-dipole distribution is the simplest example. An analytic expression describing how the activity modifies the force-balance equation for the membrane surface is obtained in the form of a moment expansion of the force distribution. This expression allows for further studies of the consequences of the activity for non-planar membranes. In particular the active contributions to mechanical properties such as tension and bending moments become apparent. It is also explained how the activity can induce a hydrodynamic attraction between the active proteins in the membrane.

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