title: Properties of sex factor and related episomes isolated from purified Escherichia coli zygote cells.
mesh_terms: D002247:Carbon Isotopes; D002458:Cell Fractionation; D002477:Cells / Q000032:analysis; D002499:Centrifugation, Density Gradient; D002501:Centrifugation, Zonal; D003090:Coliphages; D003227:Conjugation, Genetic; D003433:Crosses, Genetic; D003470:Culture Media; D004261:DNA Replication; D004269:DNA, Bacterial / Q000032:analysis* / Q000302:isolation & purification; D004926:Escherichia coli; D005260:Female; D005306:Fertilization; D005827:Genetics, Microbial; D008722:Methods; D008967:Molecular Biology; D008970:Molecular Weight; D009587:Nitrogen Isotopes; D010063:Ovum / Q000032:analysis*; D010759:Phosphorus Isotopes; D012737:Sex Factors; D013936:Thymidine; D014316:Tritium
chemical_list: D002247:Carbon Isotopes; D003470:Culture Media; D004269:DNA, Bacterial; D009587:Nitrogen Isotopes; D010759:Phosphorus Isotopes; D014316:Tritium; D013936:Thymidine