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A lattice-dynamical model has been developed of DNA in a crystalline lattice. This model is used to evaluate the harmonic nearest-neighbor force constants of highly oriented films of Na-, K-, Rb-, and Cs-DNA as a function of relative humidity from Raman data. These DNA-counterion systems were chosen since they all undergo an A to B transition. The analysis suggests that the A to B transition takes place in these different DNA's when the effective force constant of the intermolecular bond falls below a ``critical'' value.
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Lavalle et al. (1991) studied this question.
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