BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//wp-events-plugin.com//6.4.7.2//EN
TZID:Europe/Paris
X-WR-TIMEZONE:Europe/Paris
BEGIN:VEVENT
UID:1-90@lptms.universite-paris-saclay.fr
DTSTART:20130402T110000Z
DTEND:20130402T120000Z
DTSTAMP:20130418T124021Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lptm
 s-chase-broedersz/
SUMMARY:Séminaire du LPTMS: Chase Broedersz - LPTMS\, salle 201\, 2ème é
 tage\, Bât 100\, Campus d'Orsay - 2 Avr 13 11:00
DESCRIPTION:Actively stressed marginal networks\nChase Broedersz\, Princeto
 n University\nThe mechanical properties of cells are regulated in part by 
 internal stresses generated actively by molecular motors in the cytoskelet
 on. Experiments on reconstituted intracellular F-actin networks with myosi
 n motors show that such active contractility dramatically affects network 
 elasticity. There is also experimental evidence that cytoskeletal networks
  in living cells may be unstable or only marginally stable in the absence 
 of motor activity. We study the impact of active stresses on the mechanics
  of disordered\, marginally stable networks using a simple model for netwo
 rks of fibers with linear bending and stretching elasticity. Motor activit
 y controls the elasticity in an anomalous fashion close to the point of ma
 rginal stability by coupling to critical network fluctuations. In addition
 \, such motor stresses can stabilize initially floppy networks\, extending
  the range of critical behavior to a broad regime of network connectivitie
 s below the marginal point. Away from this regime\, or at high stress\, mo
 tors give rise to a linear increase in stiffness with stress. The remarkab
 le mechanical response of these actively stressed networks is captured by 
 a simple\, constitutive scaling relation\, which highlights the important 
 role of nonaffine strain fluctuations as a susceptibility to motor stress.
LOCATION:LPTMS\, salle 201\, 2ème étage\, Bât 100\, Campus d'Orsay\, 15 
 Rue Georges Clemenceau\, Orsay\, 91405\, France
GEO:48.698185;2.181768
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=15 Rue Georges Clemenceau\,
  Orsay\, 91405\, France;X-APPLE-RADIUS=100;X-TITLE=LPTMS\, salle 201\, 2è
 me étage\, Bât 100\, Campus d'Orsay:geo:48.698185,2.181768
END:VEVENT
END:VCALENDAR