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DTSTART:20230326T030000
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DTSTART:20231029T020000
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BEGIN:VEVENT
DTSTAMP:20260424T221017Z
UID:63bd46212806c335407906@ist.ac.at
DTSTART:20230420T110000
DTEND:20230420T120000
DESCRIPTION:Speaker: Raphael Jeanneret\nhosted by Jérémie Palacci\nAbstra
 ct: Excess of light can be hazardous for photosynthetic organisms. When in
 tensity is too high\, the motile micro-algae \\textit{Chlamydomonas reinha
 rdtii} therefore reorients itself to swim away from the incident light. We
  recently discovered that a suspension of such migrating cells can be unst
 able\, whereby small spatial fluctuations in cell density can quickly trig
 ger the phase separation of the system and the formation of dynamic branch
 ing patterns\, whose features depend on the global cell density\, light in
 tensity and medium viscosity. This new kind of instability can be understo
 od from the strong coupling between cell density and light fields through 
 both negative phototaxis and light absorption by the individual cells. Our
  model captures the destabilization of the system for critical control par
 ameters and finely reproduces the experimental data. On the physiological 
 side\, as a consequence of light absorption\, we have shown that algae ins
 ide dense areas are protected from the light stress\, showing that on shor
 t timescales\, phototaxis efficiently contributes to photoprotection throu
 gh non-trivial reponses at the population level. 
LOCATION:Big Seminar Room B (big) I23.EG /63 seats (I23.EG.102)\, ISTA
ORGANIZER:cpetz@ist.ac.at
SUMMARY:Raphael Jeanneret: Collective photoprotection through light-induced
  phase separation in a phototactic micro-algae
URL:https://talks-calendar.ista.ac.at/events/4070
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