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Interphases of Chain Molecules: Monolayers and Lipid Bilayer Membranes

Ken A. Dill and Paul J. Flory
Proceedings of the National Academy of Sciences of the United States of America
Vol. 77, No. 6, [Part 1: Physical Sciences] (Jun., 1980), pp. 3115-3119
Stable URL: http://www.jstor.org/stable/8686
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Interphases of Chain Molecules: Monolayers and Lipid Bilayer Membranes
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Abstract

Using the lattice model for a liquid, we treat the packing of short-chain molecules in interphases such as bilayer membranes. The constant density in the interphase imposes intermolecular constraints on the configurations of the flexible chains. The statistical theory here presented predicts a diffuse distribution of chain ends near the bilayer midplane; no adjustable parameters are required. Inasmuch as some of the chains terminate relatively near the polar interface, the number of chains reaching deeper planar layers is diminished. Consequently, configurational freedom increases with depth. This is the source of the well-known disorder gradient.

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