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BEGIN:VEVENT
DTSTAMP:20260825T234523Z
LAST-MODIFIED:20171011T143333Z
DTSTART:20171023T163000Z
DTEND:20171023T173000Z
UID:event1825@bu.edu
URL:http://physics.bu.edu/internal/events/show/1825
SUMMARY:"On Growth and Form of Range Expansions at Liquid Interfaces"
DESCRIPTION:Featuring Severine Atis\, Harvard University\nHosted by: Kirill
	 Korolev\n\nPart of the Biophysics Seminars.\n\nTransport phenomena shape a
	nd constantly reorganize materials at every scale. In presence of hydrodyna
	mical flows\, the Lagrangian advection of individual particles strongly inf
	luences their dispersion\, segregation and clustering. Range expansions of 
	living cells resting on liquid substrates is of great importance in underst
	anding the organization of microorganism populations. However\, combining g
	rowth dynamics of an expanding assembly of cells with hydrodynamics leads t
	o challenging problems\, which involve the coupling of nonlinear dynamics\,
	 stochasticity and transport. In this talk\, I will present laboratory expe
	riments\, combined with numerical modelling\, focused on the collective dyn
	amics of genetically labelled microorganisms undergoing division and compet
	ition in the presence of a variety of flows. We have created an extremely v
	iscous medium that allows us to grow cells on a controlled liquid interface
	 over macroscopic scales. I will show that an expanding population of micro
	organisms can itself generate a radial flow\, leading to an accelerated pro
	pagation and fragmentation of the initial colony. I will show how the dynam
	ics and morphology of these microbial populations is affected by the fluid 
	dynamics triggered by this metabolically generated flow. I will conclude by
	 discussing the potential influence of transport and mixing on evolutionary
	 dynamics\, and how the control of cell assemblies on liquid interfaces can
	 lead to a wide range of phenomena at the intersection between cellular bio
	logy and physics.
LOCATION:RKC 106C\, 610 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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