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Dielectric properties of aqueous solutions of sonicated DNA above 40 MHz

✍ Scribed by Juan R. de Xammar Oro; J. Raul Grigera

Publisher: Wiley (John Wiley & Sons)
Year: 1984
Tongue: English
Weight: 312 KB
Volume: 23
Category: Article
ISSN: 0006-3525
DOI: 10.1002/bip.360230803

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✦ Synopsis

The dielectric properties of sonicated calf-thymus DNA sodium salt in aqueous sclutions have been studied in the frequency range from 40 MHz to 2 GHz by time domain spectroscopy (TDS). A dielectric dispersion not previously reported was found, which has a characteristic frequency of about 150 MHz. All of the dielectric parameters are insensitive to the size of DNA fragments and to helix-to-coil transitions. The study of this dispersion as a function of DNA concentration and temperature allows us to conclude that it may be due to counterion fluctuation on short sections, probably in a direction transverse to the macromolecular axis.

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