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SUMMARY:Phototactic swimming of multicellular microalgae - Hélène de Mal
 eprade (University of Cambridge)
DTSTART:20181108T130000Z
DTEND:20181108T140000Z
UID:TALK114442@talks.cam.ac.uk
CONTACT:Anne Herrmann
DESCRIPTION:The unicellular algae Chlamydomonas exhibits two flagella whos
 e beating enable it to swim in a stroke and move towards light. Similarly\
 , the multicellular algae Volvox\, made of thousands of Chlamydomonas-like
  cells\, shows a coherent collective behaviour\, also swimming towards lig
 ht. \nHere\, we study the phototactic behaviour of Gonium\, a colony made 
 of 16 Chlamydomonas-like cells\, arranged in a square plate shape. The ver
 y specific organisation of the cells within the colony makes the algae an 
 interesting intermediate step in the transition from unicellular to comple
 x multicellular organisms. It shows a strong phototactic behaviour\, as it
  is able to alter its swimming direction within a couple of seconds to fac
 e light. To understand the efficiency of this reaction\, we follow individ
 ual flagella responses after a change in the light environment. Variations
  in flagella frequency and shape\, as well as flow observation with micro-
 PIV\, offer an insight into the underlying mechanisms of this efficient ad
 aptation to light.\n\n
LOCATION:MR11\, Centre for Mathematical Sciences\, Wilberforce Road\, Camb
 ridge
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