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The dichroic tensor of flexible helices

✍ Scribed by Robert W. Wilson; John A. Schellman

Publisher: Wiley (John Wiley & Sons)
Year: 1977
Tongue: English
Weight: 955 KB
Volume: 16
Category: Article
ISSN: 0006-3525
DOI: 10.1002/bip.1977.360161006

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

A statistical theory of the linear dichroism of DNA‐like chains is presented for two models which are discrete versions of the wormlike coil. In the final form the linear dichroism of the entire chain is related directly to the dichroic properties of a chain segment (base pair). Though the derivations are somewhat complicated, the result [Eq. (28)] is simple and the required statistical parameters can be easily calculated for either model from measured values of the persistence length. In fact, for molecules as stiff as double‐stranded DNA, the results can be reduced with good accuracy to the form
showing that the “optical persistence” given on the left is directly proportional to the structural persistence, P~∞~/l. As in previous theories the results are restricted to chains in their Gaussian limit.

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