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Intensity ratio variations for several DNA in-plane vibrations at 1717 (guanine, thymine), 1663 (thymine, guanine, adenine, cytosine), 1609 (adenine), 1492 (cytosine, guanine), and 1222 cm−1 (PO2 stretch) as a function of Mg and Ca concentrations (different cation-DNA(P) molar ratios).
