title: Dynamics of two-component membranes surrounded by viscoelastic media.
abstract: We discuss the dynamics of two-component fluid membranes which are surrounded by viscoelastic media. We assume that membrane-embedded proteins can diffuse laterally and induce a local membrane curvature. The mean squared displacement of a tagged membrane segment is obtained as a generalized Einstein relation. When the elasticity of the surrounding media obeys a power-law behavior in frequency, an anomalous diffusion of the membrane segment is predicted. We also consider the situation where the proteins generate active non-equilibrium forces. The generalized Einstein relation is further modified by an effective temperature that depends on the force dipole energy. The obtained generalized Einstein relations are useful for membrane microrheology experiments.
authors.affiliation: Department of Chemistry, Graduate School of Science and Engineering, Tokyo Metropolitan University, Tokyo 192-0397, Japan.
authors.forename: Shigeyuki
authors.initials: S
authors.lastname: Komura
authors.forename: Kento
authors.initials: K
authors.lastname: Yasuda
authors.forename: Ryuichi
authors.initials: R
authors.lastname: Okamoto
mesh_terms: D002462:Cell Membrane / Q000737:chemistry / Q000378:metabolism*; D004058:Diffusion; D004548:Elasticity; D008565:Membrane Proteins / Q000378:metabolism; D013816:Thermodynamics; D014783:Viscosity
chemical_list: D008565:Membrane Proteins