title: Isolation of catenated forms of R factor DNA from minicells.
mesh_terms: D002499:Centrifugation, Density Gradient; D004269:DNA, Bacterial / Q000302:isolation & purification*; D004352:Drug Resistance, Microbial; D004926:Escherichia coli / Q000032:analysis* / Q000166:cytology; D005827:Genetics, Microbial; D013395:Sucrose; D013936:Thymidine / Q000378:metabolism; D014316:Tritium
chemical_list: D004269:DNA, Bacterial; D014316:Tritium; D013395:Sucrose; D013936:Thymidine