title: Cryptic plasmids in a minicell-producing strain of Salmonella typhimurium.
abstract: A minicell-producing strain of Salmonella typhimurium contains two cryptic plasmids. One has a molecular weight of 2.6 x 10(6) to 2.8 x 10(6), is present in multiple copies per cell, and segregates into minicells. The other has a molecular weight of 130 x 10(6), is present in few copies per cell, and probably does not segregate into minicells.
mesh_terms: D001965:Bromides; D002499:Centrifugation, Density Gradient; D002586:Cesium; D002712:Chlorides; D004269:DNA, Bacterial / Q000302:isolation & purification; D004270:DNA, Circular / Q000302:isolation & purification; D004996:Ethidium; D005111:Extrachromosomal Inheritance; D006863:Hydrogen-Ion Concentration; D008854:Microscopy, Electron; D008970:Molecular Weight; D012486:Salmonella typhimurium / Q000032:analysis / Q000166:cytology*; D013936:Thymidine / Q000378:metabolism; D014316:Tritium
chemical_list: D001965:Bromides; D002712:Chlorides; D004269:DNA, Bacterial; D004270:DNA, Circular; D014316:Tritium; D002586:Cesium; D004996:Ethidium; D013936:Thymidine