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SUMMARY:Nonlinear and collective dynamics of model cilia - Eric Keaveny (I
 mperial College London)
DTSTART:20250610T120000Z
DTEND:20250610T130000Z
UID:TALK231250@talks.cam.ac.uk
CONTACT:Sarah Loos
DESCRIPTION:Motile cilia are slender\, flexible organelles used by cells a
 cross eukaryotic life to move and manipulate surrounding fluids.  In this 
 talk\, I will describe and use two modelling approaches to probe cilia dyn
 amics at both the individual and collective levels.  At the individual lev
 el\, I will present a study where we make of use the follower-force model 
 to explore the internal structural properties of cilia.  I will show how e
 ven modest values of bending modulus anisotropy can eliminate 3D states\, 
 allowing only 2D planar beating to emerge.  \n\nAt the collective level\, 
 I will present results examining the emergence and coordination of cilia o
 n a spherical surface using a model ciliate akin to the well-studied algae
  colony Volvox.  Here\, we make use of a modelling framework that we refer
  to as the filament oscillator model.  Its defining feature is that the ci
 lia are governed by just two dynamic variables\, but retain their filament
 -like shape.  We find that for sufficiently flexible cilia\, there is bist
 ability between symplectic and diaplectic metachronal waves.  I will discu
 ss this result\, as well as characterise the resulting propulsive capabili
 ties of these emergent states.
LOCATION:Center for Mathematical Sciences\, Lecture room MR20
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