Abstract
The influence of metal ions of different valence on the conformation of DNA molecule in solution has been studied. The influence of concentration and charge of counterions on the volume, persistent length and secondary structure of the macromolecules was analyzed. An assessment of the permeability of DNA coil for the solvent at different values of ionic strength of the solution was made. The state of the DNA molecule in solutions with high ionic strengths, when the presence of certain ions causes sharp changes in optical anisotropy of the macromolecule, is considered in detail.
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