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SUMMARY:Microalgal bioluminescence - a complex response to viscoelastic me
 mbane deformation - Nico Schramma (Georg-August-Universität Göttingen an
 d Max Planck Institute for Dynamics and Self-Organization) 
DTSTART:20190829T120000Z
DTEND:20190829T130000Z
UID:TALK129034@talks.cam.ac.uk
CONTACT:Anne Herrmann
DESCRIPTION:A huge variety of marine microalgae are known to emit blue lig
 ht when they are exposed to flow induced forces on their surface. This res
 ponse is hypothesized to function as a defense strategy. Upon the sensing 
 of mechanical forces a biochemical signaling cascade is triggered\, which 
 eventually results in light emission. However\, the nature of mechanosensi
 ng is not completely understood and the difference between shear and norma
 l force-induced bioluminescence is still puzzling. Here\, we use micropipe
 ttes to hold and deform the single cellular microalgae Pyrocystis lunula. 
 The bioluminescent response is studied using high speed and high sensitivi
 ty image acquisition. A precise control of the deformation and deformation
  rate of the organism enabled us to extract the complex strain dependence 
 of the bioluminescent performance. Moreover\, we investigate the dynamics 
 of the flashes and extract the internal time scale of both signal transmis
 sion and the bioluminescent reaction itself.
LOCATION:MR11\, Centre for Mathematical Sciences\, Wilberforce Road\, Camb
 ridge
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