Self-organization and Mechanical Properties of Active Filament Bundles

Details Self-organization and Mechanical Properties of Active Filament Bundles Self-organization and Mechanical Properties of Active Filament Bundles

2002-07-08

arxiv.org/abs/cond-mat/0207212v2

Physics

Condensed Matter

Statistical Mechanics

19 pages, 10 figures

Scientific paper

10.1103/PhysRevE.67.051913

A phenomenological description for active bundles of polar filaments is presented. The activity of the bundle results from crosslinks, that induce relative displacements between the aligned filaments. Our generic description is based on momentum conservation within the bundle. By specifying the internal forces, a simple minimal model for the bundle dynamics is obtained, capturing generic dynamic behaviors. In particular, contracted states as well as solitary and oscillatory waves appear through dynamic instabilities. The introduction of filament adhesion leads to self-organized persistent filament transport. Furthermore, calculating the tension, homogeneous bundles are shown to be able to actively contract and to perform work against external forces. Our description is motivated by dynamic phenomena in the cytoskeleton and could apply to stress-fibers and self-organization phenomena during cell-locomotion.

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