title: Selective retention of double-stranded circular deoxyribonucleic acid by membrane filtration.
mesh_terms: D001965:Bromides; D002247:Carbon Isotopes; D002482:Cellulose; D003090:Coliphages; D004270:DNA, Circular; D004279:DNA, Viral; D004996:Ethidium; D009574:Nitro Compounds; D009690:Nucleic Acid Conformation; D013997:Time Factors; D014316:Tritium; D014462:Ultrafiltration
chemical_list: D001965:Bromides; D002247:Carbon Isotopes; D004270:DNA, Circular; D004279:DNA, Viral; D009574:Nitro Compounds; D014316:Tritium; D002482:Cellulose; D004996:Ethidium