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Models for boundary effects on molecular rotation in membranes
Author(s) -
Andersen Gregory R.,
Mazo Robert M.
Publication year - 1980
Publication title -
biopolymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.556
H-Index - 125
eISSN - 1097-0282
pISSN - 0006-3525
DOI - 10.1002/bip.1980.360190904
Subject(s) - chemistry , membrane , isotropy , diffusion , rotational diffusion , rotation (mathematics) , molecule , chemical polarity , polar , chemical physics , chain (unit) , molecular diffusion , thermodynamics , physics , geometry , optics , metric (unit) , biochemistry , mathematics , operations management , organic chemistry , astronomy , economics
Rotational and wobbling diffusion coefficients for spherical and long‐chain molecules in membranes are calculated using a simple hydrodynamic model. Estimates of the contributions to the diffusion coefficients arising from hydrodynamic interactions between molecules and membrane interfaces are obtained and found to be small. For molecules containing polar head groups, we show that the presence of a membrane interface can produce a significant reduction in the wobbling diffusion coefficient over what would be obtained in an isotropic fluid.