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Dielectric properties of aqueous solutions of sonicated DNA above 40 MHz
Author(s) -
de Xammar Oro Juan R.,
Raul Grigera J.
Publication year - 1984
Publication title -
biopolymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.556
H-Index - 125
eISSN - 1097-0282
pISSN - 0006-3525
DOI - 10.1002/bip.360230803
Subject(s) - dielectric , chemistry , aqueous solution , counterion , dispersion (optics) , analytical chemistry (journal) , dielectric spectroscopy , dna , nuclear magnetic resonance , helix (gastropod) , optics , chromatography , materials science , ion , optoelectronics , organic chemistry , physics , biochemistry , electrode , electrochemistry , ecology , snail , biology
The dielectric properties of sonicated calf‐thymus DNA sodium salt in aqueous solutions 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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