title: Characterization of DNA of colicinogenic factor E1 in a providence strain.
mesh_terms: D002499:Centrifugation, Density Gradient; D003087:Colicins / Q000096:biosynthesis*; D004269:DNA, Bacterial / Q000032:analysis*; D004755:Enterobacteriaceae / Q000032:analysis* / Q000378:metabolism; D004926:Escherichia coli / Q000032:analysis; D008854:Microscopy, Electron; D011511:Proteus / Q000032:analysis
chemical_list: D003087:Colicins; D004269:DNA, Bacterial