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- W2040442369 abstract "The lateral diffusion of a phospholipid probe is studied in bilayers of binary mixtures of dimyristoylphosphatidylcholine (DMPC)/cholesterol and distearoylphosphatidylcholine (DSPC)/cholesterol and in the ternary system DMPC/DSPC/cholesterol using fluorescence recovery after photobleaching. An approximate phase diagram for the ternary system, as a function of temperature and cholesterol concentration, was obtained using differential scanning calorimetry and the phase diagrams of the binary systems. This phase diagram is similar to those of the phospholipid/cholesterol binary mixtures. In bilayers where solid and liquid phases coexist, the diffusion results are interpreted in terms of phase percolation. The size of the liquid-phase domains is estimated using percolation theory. In the ternary system, addition of cholesterol up to approximately 20 mol% shifts the percolation threshold to lower area fractions of liquid, but the size of the liquid-phase domains does not change. Above approximately 20 mol% cholesterol, the liquid phase is always connected. The size of solid-phase domains clusters is estimated using a model recently developed (Almeida, P.F.F., W.L.C. Vaz, and T.E. Thompson. 1992. Biochemistry. 31:7198-7210). For cholesterol concentrations up to 20 mol%, the size of solid-phase domain units does not change. Beyond 20 mol%, cholesterol causes the size of the solid units to decrease." @default.
- W2040442369 created "2016-06-24" @default.
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- W2040442369 date "1993-02-01" @default.
- W2040442369 modified "2023-09-27" @default.
- W2040442369 title "Percolation and diffusion in three-component lipid bilayers: effect of cholesterol on an equimolar mixture of two phosphatidylcholines" @default.
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- W2040442369 doi "https://doi.org/10.1016/s0006-3495(93)81381-x" @default.
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