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Coarse-grained continuum model for molecular diffusion in a lipid monolayer

✍ Scribed by T. Sintes; A. Baumgärtner; Y.K. Levine

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
528 KB
Volume
84
Category
Article
ISSN
0167-7322

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✦ Synopsis

Recent experimental studies of lateral diffusion of lipid molecules in bilayers using single-molecule detection techniques (Schlitz et al., 1997. Biophysical J. 73:1073-1080), gave rise to speculation about confinement effects due to anomalous diffusion. Here we report a computer simulation study of the lateral diffusion of conformationally disordered lipid monolecules in a monolayer structure. No evidence for anomalous diffusion effects are found in the homogeneous monolayer studied. The classical Cohen-TurnbuU theory is found to provide a good description of the simulated lateral diffusion coefficients at high densities, above a certain threshold c*. At densities c < c*, where the diffusion of the flexible lipids is governed by their "soft core" repulsion, we found an entropically activated diffusion according to D ~ exp(-Tv/~ over a large concentration regime 0.03 < c < 0.6.

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