Novel Cholesteric Phase in Dispersions of Nucleic Acids due to Polymeric   Chelate Bridges
  We consider cholesteric liquid-crystalline DNA dispersions, and show that polymeric (Dau-Cu) complexes, the so-called bridges, between pairs of DNA molecules may generate a super liquid-crystalline structure (BR-phase). The latter could have a layered spatial structure and an abnormal optical activity that could have a bearing upon the intense CD-band observed in DNA-dispersions. 
V.L. Golo, E.I. Kats, Yu.S. Volkov, V.I. Salyanov, and Yu.M.   Yevdokimov