Ribosomes ribosome article Bacterial Proteins Binding Sites Chromatography, Gel Escherichia coli in vitro study Bacillus stearothermophilus Centrifugation, Density Gradient animal experiment bacillus stearothermophilus binding site density gradient centrifugation Electrophoresis, Polyacrylamide Gel Protein Binding Sucrose Temperature cytology drug effect gel chromatography protein binding sucrose temperature Bacillus thuringiensis Cell Cycle Kinetics Magnesium Peptide Chain Initiation Peptide Synthesis