it is shown that rrs provides good marker bands for a left-handed helix : i ) a purine ring breathing mode around 630 cm-1 coupled to the deoxyribose vibration in the syn geometry , ii ) a 1300-1340 cm-1 region characterizing local chemical interactions of the ni2+ ions with the adenine n7 position , iii ) lines at about 1483- and 1582 cm-1 correlated to the anti/syn reorientation of the adenine residues on b-z structure transition , iv ) marker bands of the thymidine carbonyl group couplings at 1680- and 1733 cm-1 due to the disposition of the thymidine residues in the z helix specific geometry .
C0034140
purine
C0001407
adenine