title: Non-chromosomal antibiotic resistance in bacteria. II. Molecular nature of R-factors isolated from Proteus mirabilis and Escherichia coli.
mesh_terms: D002586:Cesium; D004261:DNA Replication; D004269:DNA, Bacterial / Q000032:analysis; D004352:Drug Resistance, Microbial; D004926:Escherichia coli / Q000032:analysis*; D066298:In Vitro Techniques; D008854:Microscopy, Electron; D008967:Molecular Biology; D011511:Proteus / Q000032:analysis*; D014316:Tritium; D014461:Ultracentrifugation
chemical_list: D004269:DNA, Bacterial; D014316:Tritium; D002586:Cesium