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Use of the ising model for doubly ordered macromolecules

โœ Scribed by A. Tenenbaum; L. Triolo

Publisher
Wiley (John Wiley & Sons)
Year
1972
Tongue
English
Weight
496 KB
Volume
11
Category
Article
ISSN
0006-3525

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โœฆ Synopsis

We developed a statistical model, based on a one-dimensional Ising model, for a recently studied polypeptide which displays an endothermic helix-to-coil transition with an "anomalous" behavior in the heat of solution. The model supports the assumption of an ordering of the side chains due t o a specific hydrogen bond interaction among them, beside the helical ordering of the backbone; this double ordering of the macromolecule produces the %nomalous" experimental behavior. With the hypot.hesis of a highly cooperative interaction among amide groups of the backbone, of a slightly cooperative interaction among side chains, and of no interaction among amide groups and side chains, we find that the backbone cooperation increases the chains cooperation, but not vice versa; this influence decreases when the cooperat,ion in the backbone increases.

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โœ Shigetoshi Katsura; Sakari Inawashiro; Sumiyoshi Fujiki ๐Ÿ“‚ Article ๐Ÿ“… 1979 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 632 KB

The long ranged Gaussian random Ising bond model and short ranged binary random Ising bond model are discussed by the method of the pair approximation of the cluster variation and by the method of the integral equation for the distribution function of the effective fields. For the long ranged model,