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• W2053959059 abstract "Neutron diffraction is used to examine the effects of Ca2+ and ClO4- ions on interactions and some structural features of dipalmitoylphosphatidylcholine membranes in both solid and fluid lamellar phases. The results are described within the framework of Derjaguin-Landau-Verwey-Overbeek (DLVO) theory with reference to electrostatic, van der Waals, and hydration components of disjoining pressure. The Hamaker constants are evaluated under equilibrium conditions. Addition of 100 mM CaCl2 to the aqueous phase substantially increases the lamellar repeat spacing (d), which is interpreted in terms of adsorption of Ca2+ ions to bilayers followed by electrostatic repulsion between membranes. The rise of NaClO4 concentration in the presence of 100 mM CaCl2 leads to gradual decrease in d, evidently resulted from the diminution of Ca(2+)-induced positive surface potential by both electrostatic screening and binding of ClO4- ions. In the absence of CaCl2, elevation of NaClO4 concentration to 100-300 mM drastically enhances the repeat spacing and then dramatically decreases d at about 1 M NaClO4. Estimation of the hydration coefficients showed that the pronounced decrease of the repeat spacing at high NaClO4 concentrations was resulted mainly from the (partial) disruption of the structure of intermembrane bound water by chaotropic ClO4- ions and subsequent decrease in hydration repulsive pressure. Moreover, in the case of solid membranes (20 degrees C) high concentrations of ClO4- induced formation of interdigitated phase paralleled with marked reduction in bilayer thickness and corresponding increase in the effective cross-sectional area per lipid molecule." @default.
• W2053959059 created "2016-06-24" @default.
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• W2053959059 date "1991-11-01" @default.
• W2053959059 modified "2023-09-27" @default.
• W2053959059 title "A neutron diffraction study of the influence of ions on phospholipid membrane interactions" @default.
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• W2053959059 doi "https://doi.org/10.1016/0005-2736(91)90156-3" @default.
• W2053959059 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/1751521" @default.
• W2053959059 hasPublicationYear "1991" @default.
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