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Cation effects on the nonlinear electrical properties of DNA solutions

✍ Scribed by C. Marion; M. Hanss

Publisher
Wiley (John Wiley & Sons)
Year
1980
Tongue
English
Weight
558 KB
Volume
19
Category
Article
ISSN
0006-3525

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✦ Synopsis

Abstract

The nonlinear electrical properties of DNA solutions were measured when different monovalent cations were added to DNA. The influence of different parameters has been examined: fundamental frequency, field strength, and concentration. A linear relationship between the harmonic current I~h~ and the DNA concentration is shown, even for higher concentration values (400 mg/l.). The frequency dispersion of I~h~ has the same shape for all the cations and the low‐frequency amplitude of I~h~ increases in the following order: Li^+^ < Na^+^ < K^+^ < NH < Cs^+^. The nonlinear polarizability values are compared with the linear ones determined using the very low field electric birefringence technique. Both linear and nonlinear values are of the same order of magnitude. It is thought that the nonlinear electrical property of high‐molecular‐weight DNA mainly results from the deformation of the DNA coils by the electric field.

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