title: Crossover of two power laws in the anomalous diffusion of a two lipid membrane.
abstract: Molecular dynamics simulations of a bi-layer membrane made by the same number of 1-palmitoyl-2-oleoyl-glycero-3-phospho-ethanolamine and palmitoyl-oleoyl phosphatidylserine lipids reveal sub-diffusional motion, which presents a crossover between two different power laws. Fractional Brownian motion is the stochastic mechanism that governs the motion in both regimes. The location of the crossover point is justified with simple geometrical arguments and is due to the activation of the mechanism of circumrotation of lipids about each other.
authors.affiliation: Dipartimento di Chimica "G. Ciamician", Universita' di Bologna, Via F. Selmi 2, 40126 Bologna, Italy.
authors.forename: Evangelos
authors.initials: E
authors.lastname: Bakalis
authors.affiliation: Dipartimento di Chimica "G. Ciamician", Universita' di Bologna, Via F. Selmi 2, 40126 Bologna, Italy.
authors.forename: Siegfried
authors.initials: S
authors.lastname: Höfinger
authors.affiliation: Institute for the Organic Synthesis and Photoreactivity, National Research Council of Italy, Via Gobetti 101, 40129 Bologna, Italy.
authors.forename: Alessandro
authors.initials: A
authors.lastname: Venturini
authors.affiliation: Dipartimento di Chimica "G. Ciamician", Universita' di Bologna, Via F. Selmi 2, 40126 Bologna, Italy.
authors.forename: Francesco
authors.initials: F
authors.lastname: Zerbetto
mesh_terms: D004058:Diffusion; D008051:Lipid Bilayers / Q000737:chemistry*; D056004:Molecular Dynamics Simulation; D010718:Phosphatidylserines / Q000737:chemistry*
chemical_list: C116995:1-palmitoyl-2-stearoyl-3-phosphoserine; D008051:Lipid Bilayers; D010718:Phosphatidylserines