✦ LIBER ✦

Dielectric relaxation of DNA solutions. II

✍ Scribed by Masanori Sakamoto; Reinosuke Hayakawa; Yasaku Wada

Publisher: Wiley (John Wiley & Sons)
Year: 1978
Tongue: English
Weight: 271 KB
Volume: 17
Category: Article
ISSN: 0006-3525
DOI: 10.1002/bip.1978.360170609

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✦ Synopsis

Abstract

Real and imaganiry parts of complex dielectric constant of dilute solutions of DNA in 10^−3^M NaCl with molecular weight ranging from 0.4 × 10^6^ to 4 × 10^6^ were measured at frequencies from 0.2 Hz to 30 kHz. Dielectric increments Δε were obtained from Cole‐Cole plots and relaxation times τ~D~ from the loss maximum frequency. The τ~D~ of all samples agrees well with twice of the maximum viscoelastic relexation time in the Zimm theory, indicating that the low‐frequency dielectric relaxiation should be ascribed to be the rotation of DNA. The rms dipole moment, which was obtained from Δε, agree well with that calculated from the counterion fluctuation theory. The dielectric increment was found to be greatly depressed in MgCl~2~, which is resonably interpreted in terms of a strong binding of Mg^++^ ions with DNA.

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