title: [Preparation of ribosomal RNA in bacteria].
mesh_terms: D001419:Bacteria / Q000032:analysis*; D002247:Carbon Isotopes; D002499:Centrifugation, Density Gradient; D008722:Methods; D012335:RNA, Ribosomal / Q000302:isolation & purification*
chemical_list: D002247:Carbon Isotopes; D012335:RNA, Ribosomal