Abstract
This paper reports on a study of the dielectric properties of DNA (sodium salt from calf thymus, SIGMA) under heating and cooling of a sample within the temperature interval 20–60°C, which was conducted in air, in a humid environment, and in vacuum. It is shown that the data obtained can be accounted for by the sample conductivity increasing as a result of DNA releasing water into a separate phase with increasing temperature and the formation of a double electric layer at the DNA interface with metallic electrodes, without invoking the idea of ferroelectricity present in DNA.
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Original Russian Text © V.K. Yarmarkin, S.G. Shul’man, V.V. Lemanov, 2009, published in Fizika Tverdogo Tela, 2009, Vol. 51, No. 9, pp. 1771–1775.