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SUMMARY:The mechanics of bacterial flagellar locomotion in viscous and vis
 coelastic fluids - Kenny Breuer (Brown University)
DTSTART:20190919T120000Z
DTEND:20190919T130000Z
UID:TALK129439@talks.cam.ac.uk
CONTACT:Anne Herrmann
DESCRIPTION:Despite the fact that the swimming of flagellated bacteria has
  been studied for almost fifty years\, predicting their swimming in viscou
 s and viscoelastic liquids is still surprisingly controversial.  The sourc
 e of the uncertainty lies in a variety for sources\, including the physics
   of "tumbling" -  when the bacterial flagellar bundle unravels - as well 
 as the importance of non-Newtonian effects such as shear thinning and norm
 al stresses.  Here\, I will report on a series of experiments in which we 
 track individual bacteria as they move through viscous media with varying 
 viscous and viscoelastic properties. in this manner\,  we can account for 
 individual cell-to-cell variation\, and we can tease apart the different i
 nfluences of bulk viscosity\,  shear thinning\,  non-Newtonian normal stre
 sses and the ways in which the run-tumble process changes as these fluid p
 roperties vary. 
LOCATION:MR11\, Centre for Mathematical Sciences\, Wilberforce Road\, Camb
 ridge
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