title: Preparation of E. coli ribosomal subunits without loss of biological activity.
mesh_terms: D002499:Centrifugation, Density Gradient; D011232:Chemical Precipitation; D004926:Escherichia coli; D006863:Hydrogen-Ion Concentration; D007477:Ions; D008274:Magnesium; D008722:Methods; D011092:Polyethylene Glycols; D012270:Ribosomes; D012964:Sodium; D013329:Structure-Activity Relationship
chemical_list: D007477:Ions; D011092:Polyethylene Glycols; D012964:Sodium; D008274:Magnesium