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SUMMARY:Motile bacteria in giant unilamellar vesicles: A cautionary tale -
  Wilson Poon\, U. Edinburgh
DTSTART:20221125T160000Z
DTEND:20221125T170000Z
UID:TALK182975@talks.cam.ac.uk
CONTACT:Prof. Jerome Neufeld
DESCRIPTION:I will report results from a study of motile Escherichia coli 
 bacteria encapsulated inside giant lipid vesicles. Forces exerted by the b
 acteria on the inner side of the membrane are sufficient to extrude membra
 ne tubes filled with one or several bacteria. Interestingly\, a physical c
 oupling between the membrane tube and the flagella of the enclosed cells t
 ransforms the tube into an effective helical flagellum propelling the vesi
 cle. A simple theoretical model can estimate the propulsive force from the
  speed of the vesicles and demonstrate the efficacy of this coupling mecha
 nism. Importantly\, such propulsion of the whole vesicle is not seen in re
 cent studies of encapsulated Janus swimmers and of Bacillus subtills bacte
 ria. I therefore sound a cautionary note against facile generalisations in
  active matter systems\, where it seems that details matter.
LOCATION:MR2\, Centre for Mathematical Sciences\, Wilberforce Road\, Cambr
 idge
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