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SUMMARY:Ciliary coordination in marine invertebrate larvae - Rebecca Poon\
 , University of Exeter
DTSTART:20240229T130000Z
DTEND:20240229T140000Z
UID:TALK207946@talks.cam.ac.uk
CONTACT:Marco Vona
DESCRIPTION:Arrays of oscillating cilia often coordinate into a pattern kn
 own as a metachronal wave. Many theoretical and computational studies have
  shown that hydrodynamic coupling through the surrounding fluid is suffici
 ent to produce such waves. Various internal biological mechanisms are also
  hypothesized to affect the coordination of real biological ciliary arrays
 . However\, relatively few experimental studies have comprehensively chara
 cterised the coordination state of ciliary fields in living organisms.\nHe
 re we present detailed studies of the multiciliated larvae of two species 
 of marine invertebrates. Firstly\, we study the larvae of the common reef-
 building coral A. millepora\, quantifying the ciliary propulsion and coord
 ination. We then study the metachronal wave exhibited by the ciliary band 
 of the larvae of a marine annelid\, Platynereis dumerilii. The ciliary ban
 d has a simple geometry\, being one dimensional with periodic boundary con
 ditions. We quantify the steady state wave behaviour and the re-establishm
 ent of coordination. To probe the mechanisms involved in the coordination\
 , we then study the effect of physically 'interrupting' the wave by two di
 fferent methods: using laser ablation to create gaps in the ciliary band\,
  or placing physical barriers in the path of the wave to hydrodynamically 
 decouple the cilia on either side of the barrier. In all\, our results hig
 hlight complex features of ciliary metachronism not captured by simple hyd
 rodynamic models.\n
LOCATION:MR15\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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