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CATEGORIES:Engineering Fluids Group Seminar
SUMMARY:Active biological flows - Prof. Eric Lauda (DAMTP)
DTSTART;TZID=Europe/London:20220527T123000
DTEND;TZID=Europe/London:20220527T133000
UID:TALK173015AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/173015
DESCRIPTION:Biology is dominated by transport problems involvi
 ng fluid flows\, from the diffusion of nutrients a
 nd locomotion to flows around plants and the circu
 latory system of animals. In this talk\, I will di
 scuss three instances of biological flows arising 
 on small scales\, and our efforts to understand th
 em. \n\nFirst I will present our work modelling ac
 tive flows in the endoplasmic reticulum (ER). The 
 ER is a cellular organelle taking the form of a ne
 twork of fluid-filled tubules and sheets that perf
 orms essential cellular functions such as protein 
 synthesis and transport. Single particle tracking 
 in ER networks has revealed active transport\, sig
 nificantly enhanced relative to pure diffusion. In
  this work\, we build a model to test a recent hyp
 othesis for the origin of this active flow quantit
 atively. \n\nNext\, I will discuss our work on art
 ificial cytoplasmic streaming. Recent experiments 
 in cell biology have generate artificially induced
  intracellular flows using focused light localised
  in a small region of the cell to create a thermo-
 viscous flow globally inside the cell. I will pres
 ent a theoretical model of the fluid flow induced 
 by the focused light which shows excellent agreeme
 nt with experimental results. \n\nFinally I will d
 iscuss active flows that are generated in suspensi
 ons of swimming microorganisms. Recent experiment 
 have shown that magnetotactic bacteria in spherica
 l confinement self-organise in a global vortex pro
 vided that their concentration (or the external ma
 gnetic field) is large enough. We build a theoreti
 cal model of this phenomenon\, showing in particul
 ar the relationship between the local flows genera
 ted by the swimmers and their ability to induce lo
 ng-range self-organisation. 
LOCATION:CUED\, LT6
CONTACT:
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