Abstract
We measure the viscoelasticity of entangled F-actin over length scales between and 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 ; this is probed with one-particle microrheology. Longitudinal fluctuations of the filaments increase the elastic modulus between 0.1 and at length scales up to the filament persistence length; this is probed by two-particle microrheology.
- Received 28 March 2003
DOI:https://doi.org/10.1103/PhysRevLett.91.158302
©2003 American Physical Society