title: Sedimentation analysis of conformation changes of circular PM 2  DNA in relation to the ionic strength.
mesh_terms: D004247:DNA; D009690:Nucleic Acid Conformation; D009691:Nucleic Acid Denaturation; D009994:Osmolar Concentration; D010617:Phenanthridines; D012965:Sodium Chloride; D014325:Tromethamine; D014461:Ultracentrifugation
chemical_list: D010617:Phenanthridines; D014325:Tromethamine; D012965:Sodium Chloride; D004247:DNA