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Dielectric relaxation and orientation of DNA molecules

โœ Scribed by M. Hanss; J. C. Bernengo

Publisher
Wiley (John Wiley & Sons)
Year
1973
Tongue
English
Weight
506 KB
Volume
12
Category
Article
ISSN
0006-3525

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โœฆ Synopsis

Abstract

A conductivity dispersion has been measured at very low frequencies (VLF) on several concentrated DNA solutions. By measuring simultaneously their electric birefringence decay, it is shown that the dielectric relaxation (which is related to the conductivity dispersion) is due to the molecular orientation. Different polarization mechanisms are discussed. It is concluded that the DNA polarizability measured in the VLF range can only be explained by the orientation of a permanent ionic dipole. It is suggested that such permanent dipoles could be caused by small differences in the ionic composition between the two molecular โ€œends;โ€ the difference could either be stable (asymmetrical localization of protein impurities for instance) or transient (fluctuating dipoles explained by the Kirkwoodโ€Schumaker theory).

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## Abstract As a continuation of previous papers [__Biopolymers__ (1976) **15**, 879; (1978) **17**, 1508], the lowโ€frequency dielectric relaxation of DNA solutions was studied with a fourโ€electrode cell and the simultaneous twoโ€frequency measurement. Below a critical concentration, the dielectric