Volume 139, 2008

Spontaneous flow of active polar gels in undulated channels

Abstract

Active systems are those where energy is constantly injected by an external source. A typical example is the cytoskeleton of cells made of actin filaments and myosin molecular motors which consume ATP. In this paper, we study the behavior of an active polar gel in a thin, non-uniform channel modeled as a two-dimensional strip with periodically undulated walls. Using our recent hydrodynamic theory of active polar gels, we show that the orientation of the actin filaments parallel to the walls of the channel induces a flow even in the absence of any pressure gradient. The average flow is a simple shear if there is a phase difference between the undulations of the two walls of the channel. We also discuss applications of these results to various biological problems.

Article information

Article type
Paper
Submitted
01 Nov 2007
Accepted
07 Jan 2008
First published
23 Apr 2008

Faraday Discuss., 2008,139, 369-375

Spontaneous flow of active polar gels in undulated channels

A. Zumdieck, R. Voituriez, J. Prost and J. F. Joanny, Faraday Discuss., 2008, 139, 369 DOI: 10.1039/B716934E

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