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CATEGORIES:DAMTP BioLunch
SUMMARY:The cell-cycle dependence of alga motility and the
  collective motion under influence - Di Jin (Unive
 rsity of Cambridge)
DTSTART;TZID=Europe/London:20180301T130000
DTEND;TZID=Europe/London:20180301T140000
UID:TALK102142AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/102142
DESCRIPTION:Chlamydomonas reinhardtii is an model organism for
  biflagellate motility studies. They are able to r
 eorient in respond to gravity and achieve upward s
 wimming in quiescent fluid. The dynamics is conven
 tionally quantified by a time scale called B. The 
 swimming direction of algae is stochastic\, quanti
 fied by rotational diffusivity Dr. Along with the 
 swimming speed vs\, the motility parameters of Chl
 amy have been measured in a number of studies\, bu
 t less is known about their variation through the 
 cell cycle under synchronised culturing conditions
 . Besides the known resorption of flagella prior t
 o cell division\, which arrests motility\, this st
 udy has uncovered specific temporal variations of 
 the three swimming parameters through the cell cyc
 le\, which are found to associate with the regulat
 ion of cell energetics. As a result\, the observed
  collective motion of an algal suspension in respo
 nse to a down-welling Poiseuille flow varies if ce
 lls were prepared from different cell-cycle stages
 . For the first time\, the collective motion are i
 nvestigated by theoretical predictions parametrise
 d with the cell-cycle dependent motility parameter
 s. The results reinforced the importance of includ
 ing cell synchronisation and fixed time-point samp
 ling in the experimental protocols of algal motili
 ty studies. 
LOCATION:MR11\, Centre for Mathematical Sciences\, Wilberfo
 rce Road\, Cambridge
CONTACT:Anne Herrmann
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