title: Optical studies of a conformational change in DNA before melting.
mesh_terms: D000818:Animals; D001483:Base Sequence; D002712:Chlorides; D002942:Circular Dichroism; D003016:Clostridium perfringens; D004247:DNA; D004269:DNA, Bacterial; D004926:Escherichia coli; D006863:Hydrogen-Ion Concentration; D007093:Imidazoles; D008094:Lithium; D008961:Models, Structural; D009690:Nucleic Acid Conformation; D012487:Salmonidae; D012965:Sodium Chloride; D013057:Spectrum Analysis; D013696:Temperature
chemical_list: D002712:Chlorides; D004269:DNA, Bacterial; D007093:Imidazoles; D012965:Sodium Chloride; D004247:DNA; D008094:Lithium