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31 papers · 1 filter
Local viscoelasticity of living cells measured by rotational magnetic spectroscopy
J. -F. Berret
When submitted to a magnetic field, micron size wires with superparamagnetic properties behave as embedded rheometers and represent interesting sensors for micro-rheology. Here we…
Active particles with soft and curved walls: Equation of state, ratchets, and instabilities
Nikolai Nikola, Alexandre P. Solon, Yariv Kafri +3
We study, from first principles, the pressure exerted by an active fluid of spherical particles on general boundaries in two dimensions. We show that, despite the non-uniform press…
Spatial fluctuations at vertices of epithelial layers: quantification of regulation by Rho pathway
É. Fodor, V. Mehandia, J. Comelles +5
In living matter, shape fluctuations induced by acto-myosin are usually studied in vitro via reconstituted gels, whose properties are controlled by changing the concentrations of a…
Homogeneous deposition of particles by absorption on hydrogels
François Boulogne, François Ingremeau, Julien Dervaux +2
When a drop containing colloidal particles evaporates on a surface, a circular stain made of these particles is often observed due to an internal flow toward the contact line. To h…
Polygonal instabilities on interfacial vorticities
Matthieu Labousse, John W. M. Bush
We report the results of a theoretical investigation of the stability of a toroidal vortex bound by an interface. Two distinct instability mechanisms are identified that rely on, r…
Irreversible Collective Migration of Cyanobacteria in Eutrophic Conditions
Julien Dervaux, Annick Méjean, Philippe Brunet
In response to natural or anthropocentric pollutions coupled to global climate changes, microorganisms from aquatic environments can suddenly accumulate on water surface. These den…