title: Multinuclear NMR investigation of the NaDNA/ethidium bromide anisotropic system.
abstract: A combined use of (31)P, (23)Na, (2)H and (17)O NMR spectroscopies and polarized light microscopy has been employed to investigate the effect of the ethidium bromide (EB) binding on the liquid crystalline phase of concentrated double stranded DNA solutions. The optical textures and the (31)P and (23)Na NMR spectra of the DNA anisotropic solutions show that the intercalation of EB induces significant modifications either in the arrangements of the DNA rods and the surrounding ionic atmosphere. On the contrary, no indication of significant changes of the orientational order of the water molecules around DNA emerges from the water (2)H and (17)O NMR spectra.
authors.affiliation: Dipartimento di Scienze Chimiche, Cittadella Universitaria di Monserrato, Universi di Cagliari, S.S. 554, 09042, Monserrato (Ca), Italy.
authors.forename: Andrea
authors.initials: A
authors.lastname: Catte
authors.forename: Flaminia C
authors.initials: FC
authors.lastname: Marincola
authors.forename: Mariano
authors.initials: M
authors.lastname: Casu
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Saba
authors.forename: Adolfo
authors.initials: A
authors.lastname: Lai
mesh_terms: D000818:Animals; D016880:Anisotropy; D002417:Cattle; D004247:DNA / Q000737:chemistry*; D004996:Ethidium / Q000494:pharmacology*; D007477:Ions; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008859:Microscopy, Polarization; D013950:Thymus Gland / Q000378:metabolism
chemical_list: D007477:Ions; D004247:DNA; D004996:Ethidium