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SUMMARY:Cytoplasmic streaming from microfilament self-organisation - Franc
 is Woodhouse (Damtp)
DTSTART:20130510T150000Z
DTEND:20130510T160000Z
UID:TALK44328@talks.cam.ac.uk
CONTACT:Dr Ed Brambley
DESCRIPTION:Many plant cells exhibit large-scale active circulation of the
 ir entire fluid contents\, a process termed cytoplasmic streaming. The dri
 ving mechanism is known: myosin-coated organelles entrain cytoplasm as the
 y process along actin filament bundles fixed at the periphery. Still unkno
 wn\, however\, is the developmental process which constructs the well-orde
 red actin configurations required for coherent cell-scale flow. Experiment
 s on streaming regeneration in Characean algal cells\, whose longitudinal 
 flow is perhaps the most regimented of all\, suggest that microfilament se
 lf-organization is at work. We propose a robust model of streaming emergen
 ce that combines motor dynamics with both micro- and macroscopic hydrodyna
 mics to explain how several independent processes\, each ineffectual on it
 s own\, can reinforce to ultimately develop the patterns of streaming obse
 rved in the Characeae and other streaming species.
LOCATION:MR2\, Centre for Mathematical Sciences\, Wilberforce Road\, Cambr
 idge
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