We have measured the counterion species and concentration dependence of the low-frequency Raman spectrum, speed of sound, and the A-B transition in solid DNA. We find that both the frequency of the lowest Raman active mode, and the water content at the A-B phase transition depend strongly on ion size and concentration. Longitudinal elastic constants show only a small dependence. These results indicate that ion-mediated interhelical forces control several important properties of solid DNA.
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Weidlich et al. (1988) studied this question.
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