title: Cholesterol induced suppression of large swelling of water layer in phosphocholine floating bilayers.
abstract: The effect of the addition of 10 mol % cholesterol to 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) floating bilayers has been investigated by means of neutron reflectivity measurements. The large swelling of the water layer between the two bilayers found in pure phosphocholine systems around the lipid main phase transition is greatly reduced in the 9:1 DPPC:cholesterol mixture. The analysis of the structure of the bilayer reveals that in the gel phase cholesterol induces the presence of a high rms roughness that disappears in the fluid phase.
authors.affiliation: Institut Laue-Langevin, 6 rue Jules Horowitz, bp 156, 38042 Grenoble, France.
authors.forename: Barry
authors.initials: B
authors.lastname: Stidder
authors.forename: Giovanna
authors.initials: G
authors.lastname: Fragneto
authors.forename: Robert
authors.initials: R
authors.lastname: Cubitt
authors.forename: Arwel V
authors.initials: AV
authors.lastname: Hughes
authors.forename: Stephen J
authors.initials: SJ
authors.lastname: Roser
mesh_terms: D015060:1,2-Dipalmitoylphosphatidylcholine / Q000737:chemistry*; D002784:Cholesterol / Q000737:chemistry*; D008051:Lipid Bilayers / Q000737:chemistry*; D009502:Neutrons; D012542:Scattering, Radiation; D013499:Surface Properties; D014867:Water / Q000737:chemistry
chemical_list: D008051:Lipid Bilayers; D014867:Water; D015060:1,2-Dipalmitoylphosphatidylcholine; D002784:Cholesterol