title: Isolation of circular DNA by zonal centrifugation. Separation of normallength, double length and catenated M13 replicative form DNA and of host specific "episomal" DNA.
mesh_terms: D002501:Centrifugation, Zonal; D003090:Coliphages / Q000032:analysis*; D004269:DNA, Bacterial / Q000302:isolation & purification*; D004279:DNA, Viral / Q000302:isolation & purification*; D004926:Escherichia coli / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D008722:Methods; D008854:Microscopy, Electron; D008970:Molecular Weight; D010759:Phosphorus Isotopes; D014316:Tritium
chemical_list: D004269:DNA, Bacterial; D004279:DNA, Viral; D010759:Phosphorus Isotopes; D014316:Tritium