title: Isolation and characterization of several cryptic plasmids from clinical isolates of Bacteroides fragilis.
mesh_terms: D001431:Bacteriological Techniques; D001433:Bacteriolysis; D001439:Bacteroides / Q000302:isolation & purification*; D002250:Carbon Radioisotopes; D002499:Centrifugation, Density Gradient; D004269:DNA, Bacterial / Q000032:analysis / Q000528:radiation effects; D008854:Microscopy, Electron; D009690:Nucleic Acid Conformation; D011830:Radiation Effects; D013936:Thymidine / Q000378:metabolism; D014316:Tritium; D014461:Ultracentrifugation
chemical_list: D002250:Carbon Radioisotopes; D004269:DNA, Bacterial; D014316:Tritium; D013936:Thymidine