the lowest vibrational frequencies detected in the canonical dna structures -- at 18 +/- 2 cm-1 in the b-dna crystal , near 24 +/- 2 cm-1 in a-dna crystals , and near 30 +/- 2 cm-1 in z-dna crystals -- are shown to correlate well with the degree of dna hydration in the crystal structures , as well as with the level of hydration in calf thymus dna fibers .
C0043442
z-dna
C0012854
dna