title: [Preparation of sigma and rho factors].
mesh_terms: D001426:Bacterial Proteins / Q000302:isolation & purification*; D002845:Chromatography; D002848:Chromatography, DEAE-Cellulose; D012321:DNA-Directed RNA Polymerases / Q000032:analysis* / Q000302:isolation & purification; D004591:Electrophoresis, Polyacrylamide Gel; D004926:Escherichia coli / Q000032:analysis; D007700:Kinetics; D012313:RNA / Q000138:chemical synthesis; D014158:Transcription, Genetic
chemical_list: D001426:Bacterial Proteins; D012313:RNA; D012321:DNA-Directed RNA Polymerases