Studies on mutant phenylalanyl RNA synthetases of Escherichia coli.

Carbon Isotopes Cell-Free System Centrifugation, Density Gradient Chromatography, Gel DNA, Bacterial Drug Stability Escherichia coli/enzymology Hydrogen-Ion Concentration Immunoassay Kinetics Ligases Molecular Weight Mutation Phenotype Temperature

Carbon Isotopes DNA, Bacterial Ligases