Centrifugation, Density Gradient 28 article 28 density gradient centrifugation metabolism 18 enzymology 14 Animal 10 Support, Non-U.S. Gov't 10 animal 10 Binding Sites 8 binding site 8 isolation and purification 8 Chromatography, Gel 6 Cyclic AMP 6 Escherichia coli 6 Molecular Weight 6 Protein Binding 6 Protein Kinases 6 Ribosomes 6 biosynthesis 6 cyclic AMP 6 drug effect 6 gel chromatography 6 molecular weight 6 protein binding 6 protein kinase 6 ribosome 6 4 chloromercuribenzoic acid 4 Absorption 4 Acrylates 4 Adenine Nucleotides 4