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SUMMARY:Odd dynamics of living chiral crystals - Alexander Mietke (Univers
 ity of Bristol)
DTSTART:20230703T103000Z
DTEND:20230703T110000Z
UID:TALK201160@talks.cam.ac.uk
DESCRIPTION:The emergent dynamics of collections of living organisms often
  shows signatures of the broken symmetries that exist at the single-organi
 sm level. At the same time\, organism development itself encompasses a wel
 l-coordinated sequence of symmetry breaking events that successively trans
 form a single\, nearly isotropic cell into an animal with well-defined bod
 y axis and various anatomical asymmetries. Combining these key aspects of 
 collective phenomena and embryonic development\, we describe here the spon
 taneous formation of hydrodynamically stabilized active crystals made of h
 undreds of starfish embryos that gather during early development near flui
 d surfaces. We describe a minimal hydrodynamic theory that is fully parame
 terized by experimental measurements of microscopic interactions among emb
 ryos. Using this theory\, we can quantitatively describe the stability\, f
 ormation and rotation of crystals and rationalize the emergence of mechani
 cal properties that carry signatures of an odd elastic material. Our work 
 thereby quantitatively connects developmental symmetry breaking events on 
 the single-embryo level with remarkable macroscopic material properties of
  a novel living chiral crystal system.
LOCATION:Seminar Room 1\, Newton Institute
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