The enthalpy of helix-coil transition of DNA (delta H) is determined from the experiments on DNA melting with ligands by means of absolutely general formula, which contains only values directly known from the experiment (M.D. Frank-Kamenetskii, and A.T. Karapetian, Mol. Biol. USSR 6, 621 (1972)) with the combination of the "area" method (P.O. Vardevanian, et al., Biophysica 28, 130 (1983)). The experimentally obtained data show that delta H depends on both concentration of Na+ in solution and GC-content of DNA and is of high accuracy.
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Karapetian et al. (1990) studied this question.
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