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Anomalous diffusion in living yeast cells.

Physical review letters

Actins, chemistry, Biophysics, methods, Cytoplasm, metabolism, Diffusion, Movement, Schizosaccharomyces, physiology, ultrastructure, Temperature, Thermodynamics, Time Factors

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      Abstract

      The viscoelastic properties of the cytoplasm of living yeast cells were investigated by studying the motion of lipid granules naturally occurring in the cytoplasm. A large frequency range of observation was obtained by a combination of video-based and laser-based tracking methods. At time scales from 10(-4) to 10(2) s, the granules typically perform subdiffusive motion with characteristics different from previous measurements in living cells. This subdiffusive behavior is thought to be due to the presence of polymer networks and membranous structures in the cytoplasm. Consistent with this hypothesis, we observe that the motion becomes less subdiffusive upon actin disruption.

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      The random walk's guide to anomalous diffusion: a fractional dynamics approach

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        Single-particle tracking: applications to membrane dynamics.

        Measurements of trajectories of individual proteins or lipids in the plasma membrane of cells show a variety of types of motion. Brownian motion is observed, but many of the particles undergo non-Brownian motion, including directed motion, confined motion, and anomalous diffusion. The variety of motion leads to significant effects on the kinetics of reactions among membrane-bound species and requires a revision of existing views of membrane structure and dynamics.
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          Optical measurements of frequency-dependent linear viscoelastic moduli of complex fluids.

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            15324280

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