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Cytoplasmic streaming from microfilament self-organisation

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If you have a question about this talk, please contact Dr Ed Brambley.

Many plant cells exhibit large-scale active circulation of their entire fluid contents, a process termed cytoplasmic streaming. The driving mechanism is known: myosin-coated organelles entrain cytoplasm as they process along actin filament bundles fixed at the periphery. Still unknown, however, is the developmental process which constructs the well-ordered actin configurations required for coherent cell-scale flow. Experiments on streaming regeneration in Characean algal cells, whose longitudinal flow is perhaps the most regimented of all, suggest that microfilament self-organization is at work. We propose a robust model of streaming emergence that combines motor dynamics with both micro- and macroscopic hydrodynamics to explain how several independent processes, each ineffectual on its own, can reinforce to ultimately develop the patterns of streaming observed in the Characeae and other streaming species.

This talk is part of the Fluid Mechanics (DAMTP) series.

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