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. 1997 Nov;73(5):2580–2587. doi: 10.1016/S0006-3495(97)78287-0

Effects of size of macrocyclic polyamides on their rate of diffusion in model membranes.

C Liu 1, A Paprica 1, N O Petersen 1
PMCID: PMC1181160  PMID: 9370452

Abstract

A series of homologous amphiphilic molecules with surface areas in the range of 0.3 nm2 to 3.0 nm2 were prepared and used to investigate the diffusion in model dimyristoylphosphatidylcholine membranes as a function of temperature. The diffusion behavior of smaller molecules can be described by the interfacial viscosity limited free area theory promoted by Vaz and his co-workers, and that of the larger molecules can best be modeled by a recent interpretation of the theoretical description proposed by Evans and Sackmann. The experimental data show that the rate of diffusion is controlled by the size of the molecules at the interface of the lipid membrane, and provide evidence for a view of the membrane as a hydrodynamic triple layer with a low-viscosity central layer encased by two more viscous, yet fluid, layers.

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Selected References

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