title: Premelting unwinding of the deoxyribonucleic acid duplex by aqueous magnesium perchlorate.
mesh_terms: D001435:Bacteriophages; D011232:Chemical Precipitation; D004277:DNA, Single-Stranded; D004279:DNA, Viral; D004996:Ethidium; D008274:Magnesium; D008433:Mathematics; D009690:Nucleic Acid Conformation; D009691:Nucleic Acid Denaturation; D010472:Perchlorates; D013696:Temperature; D014461:Ultracentrifugation
chemical_list: D004277:DNA, Single-Stranded; D004279:DNA, Viral; D010472:Perchlorates; D004996:Ethidium; D008274:Magnesium