Temperature and humidity dependence of the dielectric spectrum of Na DNA in solid state

The dielectric spectrum of DNA was observed in the frequency range from 10 mHz to 100 kHz-Several dielectric absorption regions were found and their dependence on temperature and humidity was studied-There seems to be a conformational transition near 290 K and a collective behaviour of the whole system DNA-water-ions at low temperatures as if there were a glass transition near 238 K. Mechanisms of all dispersion regions are discussed and special attention is paid to the model of the jump-like movement of the DNA counter-ions accompanied by water rearrangement.