Microrheology, stress fluctuations and active behavior of living cells

Details Microrheology, stress fluctuations and active behavior of living cells Microrheology, stress fluctuations and active behavior of living cells

2003-09-22

arxiv.org/abs/cond-mat/0309510v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 2 figures, to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.91.198101

We report the first measurements of the intrinsic strain fluctuations of living cells using a recently-developed tracer correlation technique along with a theoretical framework for interpreting such data in heterogeneous media with non-thermal driving. The fluctuations' spatial and temporal correlations indicate that the cytoskeleton can be treated as a course-grained continuum with power-law rheology, driven by a spatially random stress tensor field. Combined with recent cell rheology results, our data imply that intracellular stress fluctuations have a nearly $1/\omega^2$ power spectrum, as expected for a continuum with a slowly evolving internal prestress.

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