title: Fluctuation spectrum of fluid membranes coupled to an elastic meshwork: jump of the effective surface tension at the mesh size.
abstract: We identify a class of composite membranes: fluid bilayers coupled to an elastic meshwork that are such that the meshwork's energy is a function F(el)[A(xi)] not of the real microscopic membrane area A, but of a smoothed membrane's area A(xi), which corresponds to the area of the membrane coarse grained at the mesh size xi. We show that the meshwork modifies the membrane tension sigma both below and above the scale xi, inducing a steep crossover of amplitude deltasigma=dF(el)/dA(xi). The predictions of our model account for the fluctuation spectrum of red blood cell membranes coupled to their cytoskeleton. Our results indicate that the cytoskeleton might be under extensional stress, which would provide a means to regulate available membrane areas. We also predict an observable tension jump for membranes decorated with polymer "brushes."
authors.affiliation: Laboratoire de Physico-Chimie Théorique, ESPCI, 10 rue Vauquelin, F-75231 Paris cedex 05, France.
authors.forename: Jean-Baptiste
authors.initials: JB
authors.lastname: Fournier
authors.forename: David
authors.initials: D
authors.lastname: Lacoste
authors.forename: Elie
authors.initials: E
authors.lastname: Raphaël
mesh_terms: D003599:Cytoskeleton / Q000737:chemistry / Q000502:physiology; D004548:Elasticity; D004910:Erythrocyte Membrane / Q000737:chemistry / Q000502:physiology; D008051:Lipid Bilayers / Q000737:chemistry; D008560:Membrane Fluidity; D008567:Membranes, Artificial; D008954:Models, Biological; D008962:Models, Theoretical; D011108:Polymers / Q000737:chemistry; D013500:Surface Tension
chemical_list: D008051:Lipid Bilayers; D008567:Membranes, Artificial; D011108:Polymers