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CATEGORIES:DAMTP BioLunch
SUMMARY:Active versus passive bundling\, irreversible entr
 apment by rollers\, and fundamental solutions to t
 he Stokes equations - Alex Chamolly (University of
  Cambridge)
DTSTART;TZID=Europe/London:20191121T130000
DTEND;TZID=Europe/London:20191121T140000
UID:TALK135070AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/135070
DESCRIPTION:In this seminar I will be talking about various re
 sults from my PhD.\n\nI will begin with an APS-sty
 le 10 minute presentation of my work on the active
  versus passive bundling of flagella. In this work
  we categorise the various physical effects that c
 ontribute to the formation of a flagellar bundle\,
  and derive a minimal model that gives us an under
 standing of their respective importance in the bun
 dling process. We find that passive effects\, ie. 
 those due to the fact that a finite cell body is t
 ranslating\, dominate over hydrodynamic interactio
 ns for most parameter configurations.\n\nNext I wi
 ll briefly present some mathematical results that 
 emerged as a byproduct of this project. Specifical
 ly\, we derived new expressions for the flow due t
 o rotlet singularities near a no-slip sphere\, tha
 t are more useful in numerical calculations and ph
 ysically intuitive than existing formalisms.\n\nFi
 nally I will present to you some recently finished
  work on the irreversible hydrodynamic entrapment 
 of cargo particles by surface rollers that was don
 e in collaboration with Soichiro Tottori in the Ca
 vendish Laboratory. We analysed an irreversible hy
 drodynamic trapping effect\, analogous to determin
 istic lateral displacement\, by which microscopic 
 rollers can transport cargo near an interface. Our
  work features a phase diagram for feasible parame
 ter configurations\, as well as two theoretical mo
 dels explaining the physical mechanism.
LOCATION:MR14\,  Centre for Mathematical Sciences\, Wilberf
 orce Road\, Cambridge
CONTACT:Anne Herrmann
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