Departmental Papers (CBE)

Document Type

Journal Article

Date of this Version

October 2003

Comments

Copyright American Physical Society. Reprinted from Physical Review Letters, Volume 91, Issue 15, Article 158302, October 2003, 4 pages.
Publisher URL: http://dx.doi.org/10.1103/PhysRevLett.91.158302

Abstract

We measure the viscoelasticity of entangled F-actin over length scales between 1 and 100 µm using one- and two-particle microrheology, and directly identify two distinct microscopic contributions to the elasticity. Filament entanglements lead to a frequency-independent elastic modulus over an extended frequency range of 0:01–30 rad/ sec; this is probed with one-particle microrheology. Longitudinal fluctuations of the filaments increase the elastic modulus between 0.1 and 30 rad/ sec at length scales up to the filament persistence length; this is probed by two-particle microrheology.

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Date Posted: 20 December 2005

This document has been peer reviewed.