title: Studies on Escherichia coli sex factors. 3. Covalently closed F'Lac DNA molecules.
mesh_terms: D002499:Centrifugation, Density Gradient; D004269:DNA, Bacterial / Q000032:analysis* / Q000528:radiation effects; D004926:Escherichia coli / Q000032:analysis*; D046911:Macromolecular Substances; D008722:Methods; D008970:Molecular Weight; D011830:Radiation Effects; D012737:Sex Factors; D012972:Sodium Hydroxide; D013941:Thymine / Q000378:metabolism; D014316:Tritium
chemical_list: D004269:DNA, Bacterial; D046911:Macromolecular Substances; D014316:Tritium; D012972:Sodium Hydroxide; D013941:Thymine