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SUMMARY:Decoding coordinated motion in the simplest multicellular algae - 
 Hélène de Maleprade (University of Cambridge)
DTSTART:20191010T120000Z
DTEND:20191010T130000Z
UID:TALK131635@talks.cam.ac.uk
CONTACT:Anne Herrmann
DESCRIPTION:Microscopic green algae are commonly found in mud\, puddles or
  lakes\, and show great diversity in structural complexity. One encounters
  the unicellular Chlamydomonas\, exhibiting two flagella whose beating ena
 bles it to swim in a breast stroke towards light\, a nowadays widely studi
 ed behaviour favouring photosynthesis. One also finds Gonium\, an algae ma
 de of 16 Chlamydomonas-like cells arranged in two concentric squares\, wit
 h all flagella on one side of the plate. It already shows cell differentia
 tion\, and is one of the first multicellular algae: Gonium is a key organi
 sm to understand the evolution towards multicellularity.\nIn the absence o
 f central nervous system\, how can each cell adapt its individual photores
 ponse to efficiently reorient the whole algae? In this talk\, I will prese
 nt our experiments investigating the phototactic swimming of Gonium\, from
  trajectory tracking under various light conditions to micro-pipette exper
 iments offering access to the flagella description. I will explain our mod
 el linking the flagella response to the colony trajectory\, upgrading the 
 response to light of Chlamydomonas to a multicellular dynamics. This event
 ually emphasises the importance of biological noise to succeed swimming to
 wards light.\n\n
LOCATION:MR11\, Centre for Mathematical Sciences\, Wilberforce Road\, Camb
 ridge
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