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TZID:Europe/Paris
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BEGIN:VEVENT
UID:0-703@lptms.universite-paris-saclay.fr
DTSTART:20191009T110000Z
DTEND:20191009T120000Z
DTSTAMP:20190923T195317Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/156514/
SUMMARY:Physics-Biology interface seminar: Aurore Loisy - Salle des sémina
 ires du FAST et du LPTMS\, bâtiment Pascal n°530 - 9 Oct 19 11:00
DESCRIPTION:Active fluids under confinement: spontaneous flow and negative 
 viscosity\nAurore Loisy (School of Mathematics\, University of Bristol)\nS
 eminar hosted by Harold Auradou\nIt has been known for a long time that ad
 ding motile bacteria to a liquid lowers the viscosity of the mixture. But 
 only recently came the experimental evidence that this phenomenon can cont
 inue until a zero viscosity is reached (Lopez\, Gachelin\, Douarche\, Aura
 dou\, & Clément\, Phys. Rev. Lett. 115\, 028301 (2015)). An even more int
 riguing result in this experiment was the (single) data point located belo
 w the zero-viscosity threshold. So\, how is it possible to observe a stead
 y state with a negative viscosity? In this talk I will use a simple model 
 of an active liquid and propose an explanation to this peculiar phenomenon
 .\nTime permitting\, I will then consider a drop of active liquid (a minim
 al model for the actomyosin cytoskeleton) and show how the same physics al
 lows this drop to propel itself on a substrate without the need to exert a
 ny traction locally on the surface. This mode of self-propulsion\, which d
 oes not rely on adhesion\, may be relevant to cell motility in crowded env
 ironments.
CATEGORIES:physbio,seminars
LOCATION:Salle des séminaires du FAST et du LPTMS\, bâtiment Pascal n°53
 0\, rue André Riviere\, Orsay\, 91405\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=rue André Riviere\, Orsay\
 , 91405\, France;X-APPLE-RADIUS=100;X-TITLE=Salle des séminaires du FAST 
 et du LPTMS\, bâtiment Pascal n°530:geo:0,0
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