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SUMMARY:Covariant Hydrodynamics of Membranes and Nematic Surfaces - Dr. Sa
 mi Al-Izzi (Postdoctoral Fellow\, EMBL-Australia Node in Single Molecule S
 cience and School of Physics\, UNSW)
DTSTART:20220718T120000Z
DTEND:20220718T130000Z
UID:TALK176606@talks.cam.ac.uk
CONTACT:George Fortune
DESCRIPTION:Firstly\, I will review some concepts in the mechanics of flui
 d membranes (such as lipid membrane making up cell bilayers). I will then 
 discuss how hydrodynamical equations governing the membrane dynamics can b
 e derived before focussing on a specific example of a lipid membrane tube 
 under azimuthal shear. Hear we find that shear forces drive helical instab
 ilities in the tube shape which are eventually stabilised by the underlyin
 g advection\, these dynamics do however lead to a novel non-equilibrium st
 eady-state in the shape fluctuations of the membrane tube. We discuss the 
 possible role of this shear driven fluctuation amplification in the proces
 s of dynamin mediated tube scission.\n\n \nSecondly\, I will discuss some 
 theoretical work I have done extending the notions of active hydrodynamics
  to deformable surfaces with nematic ordering. We derive fully covariant h
 ydrodynamical equations in the large deformation limit for active liquid c
 rystal surfaces and characterise such equations in terms of typical dimens
 ionless numbers. I will present some simple examples of instabilities and 
 morphology generation from the coupling between ordering\, flows and shape
  and their relevance to morphogenetic processes\, such as Hydra morphogene
 sis.
LOCATION:MR9\,  Centre for Mathematical Sciences\, Wilberforce Road\, Camb
 ridge
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