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SUMMARY:The cell-cycle dependence of alga motility and the collective moti
 on under influence - Di Jin (University of Cambridge)
DTSTART:20180301T130000Z
DTEND:20180301T140000Z
UID:TALK102142@talks.cam.ac.uk
CONTACT:Anne Herrmann
DESCRIPTION:Chlamydomonas reinhardtii is an model organism for biflagellat
 e motility studies. They are able to reorient in respond to gravity and ac
 hieve upward swimming in quiescent fluid. The dynamics is conventionally q
 uantified by a time scale called B. The swimming direction of algae is sto
 chastic\, quantified by rotational diffusivity Dr. Along with the swimming
  speed vs\, the motility parameters of Chlamy have been measured in a numb
 er of studies\, but less is known about their variation through the cell c
 ycle under synchronised culturing conditions. Besides the known resorption
  of flagella prior to cell division\, which arrests motility\, this study 
 has uncovered specific temporal variations of the three swimming parameter
 s through the cell cycle\, which are found to associate with the regulatio
 n of cell energetics. As a result\, the observed collective motion of an a
 lgal suspension in response to a down-welling Poiseuille flow varies if ce
 lls were prepared from different cell-cycle stages. For the first time\, t
 he collective motion are investigated by theoretical predictions parametri
 sed with the cell-cycle dependent motility parameters. The results reinfor
 ced the importance of including cell synchronisation and fixed time-point 
 sampling in the experimental protocols of algal motility studies. 
LOCATION:MR11\, Centre for Mathematical Sciences\, Wilberforce Road\, Camb
 ridge
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