title: On the initiation of transcription by DNA-dependent RNA polymerase from Escherichia coli.
mesh_terms: D002499:Centrifugation, Density Gradient; D004269:DNA, Bacterial / Q000378:metabolism*; D012321:DNA-Directed RNA Polymerases / Q000378:metabolism*; D004926:Escherichia coli / Q000201:enzymology*; D006493:Heparin; D006824:Hybridization, Genetic; D007700:Kinetics; D008970:Molecular Weight; D009690:Nucleic Acid Conformation; D013698:Templates, Genetic; D014158:Transcription, Genetic; D014461:Ultracentrifugation
chemical_list: D004269:DNA, Bacterial; D006493:Heparin; D012321:DNA-Directed RNA Polymerases