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11 papers · 1 filter
Soft Listeria: actin-based propulsion of liquid drops
Hakim Boukellal, Otger Campàs, Jean-François Joanny +2
We study the motion of oil drops propelled by actin polymerization in cell extracts. Drops deform and acquire a pear-like shape under the action of the elastic stresses exerted by…
Gating-by-tilt of mechanosensitive membrane channels
Matthew S. Turner, Pierre Sens
We propose an alternative mechanism for the gating of biological membrane channels in response to membrane tension that involves a change in the slope of the membrane near the chan…
Probing complex RNA structures by mechanical force
S. Harlepp, T. Marchal, J. Robert +4
RNA secondary structures of increasing complexity are probed combining single molecule stretching experiments and stochastic unfolding/refolding simulations. We find that force-ind…
Tight and loose shapes in flat entangled dense polymers
Andreas Hanke, Ralf Metzler, Paul G. Dommersnes +2
We investigate the effects of topological constraints (entanglements) on two dimensional polymer loops in the dense phase, and at the collapse transition (Theta point). Previous st…
Dynamics of non-equilibrium membrane bud formation
Pierre Sens
The dynamical response of a lipid membrane to a local perturbation of its molecular symmetry is investigated theoretically. A density asymmetry between the two membrane leaflets is…
Motion of an Adhesive Gel in a Swelling Gradient: a Mechanism for Cell Locomotion
Jean-Francois Joanny, Frank Julicher, Jacques Prost
Motivated by the motion of nematode sperm cells, we present a model for the motion of an adhesive gel on a solid substrate. The gel polymerizes at the leading edge and depolymerize…