Anomalous Diffusion Probes Microstructure Dynamics of Entangled F-Actin Networks

by: IY Wong, ML Gardel, DR Reichman, Eric R Weeks, MT Valentine, AR Bausch, DA Weitz

Physical Review Letters, Vol. 92, No. 17. (2004), pp. 178101-178101.

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摘要

We study the thermal motion of colloidal tracer particles in entangled actin filament (F-actin) networks, where the particle radius is comparable to the mesh size of the F-actin network. In this regime, the ensemble-averaged mean-squared displacement of the particles is proportional to , where 0<<1 from 0.1<<100 s and depends only on the ratio of the probe radius to mesh size. By directly imaging hundreds of particles over 20 min, we determine this anomalous subdiffusion is due to the dynamics of infrequent and large jumps particles make between distinct pores in the network.

@article{wong04, abstract = {We study the thermal motion of colloidal tracer particles in entangled actin filament (F-actin) networks, where the particle radius is comparable to the mesh size of the F-actin network. In this regime, the ensemble-averaged mean-squared displacement of the particles is proportional to , where 0<<1 from 0.1<<100 s and depends only on the ratio of the probe radius to mesh size. By directly imaging hundreds of particles over 20 min, we determine this anomalous subdiffusion is due to the dynamics of infrequent and large jumps particles make between distinct pores in the network.}, author = {Wong, I. Y. and Gardel, M. L. and Reichman, D. R. and Weeks, Eric R. and Valentine, M. T. and Bausch, A. R. and Weitz, D. A. }, citeulike-article-id = {1676534}, doi = {http://dx.doi.org/10.1103/PhysRevLett.92.178101}, journal = {Physical Review Letters}, keywords = {cages, microrheology, misc, polymer-gel}, number = {17}, pages = {178101}, posted-at = {2007-09-19 17:37:51}, priority = {0}, publisher = {APS}, title = {Anomalous Diffusion Probes Microstructure Dynamics of Entangled F-Actin Networks}, url = {http://dx.doi.org/10.1103/PhysRevLett.92.178101}, volume = {92}, year = {2004} }

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TY - JOUR ID - wong04 L3 - citeulike-article-id:1676534 N2 - We study the thermal motion of colloidal tracer particles in entangled actin filament (F-actin) networks, where the particle radius is comparable to the mesh size of the F-actin network. In this regime, the ensemble-averaged mean-squared displacement of the particles is proportional to , where 0<<1 from 0.1<<100 s and depends only on the ratio of the probe radius to mesh size. By directly imaging hundreds of particles over 20 min, we determine this anomalous subdiffusion is due to the dynamics of infrequent and large jumps particles make between distinct pores in the network. IS - 17 JF - Physical Review Letters EP - 178101 TI - Anomalous Diffusion Probes Microstructure Dynamics of Entangled F-Actin Networks PB - APS VL - 92 SP - 178101 KW - cages KW - microrheology KW - misc KW - polymer-gel AU - Wong, IY AU - Gardel, ML AU - Reichman, DR AU - Weeks, Eric AU - Valentine, MT AU - Bausch, AR AU - Weitz, DA PY - 2004/// UR - http://dx.doi.org/10.1103/PhysRevLett.92.178101 ER -

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