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The kinetics of AMP-aminohydrolase, which under steady state conditions shows a typical sigmoid dependence of initial velocities versus substrate concentration, have been examined by rapid mixing methods. Using this technique it was observed that when substrate or substrate plus activator (K + ) were mixed with enzyme, the rate of appearance of product markedly increased during the first few...
After synthesis of short, nascent oligonucleotide in the presence of ( 32 P)DNA, GTP, CTP, UTP and 3'dATP, one can excise with deoxyribonuclease a ternary complex of RNA polymerase, protected DNA and oligonucleotide, while the enzyme simply bound to the template is removed by increasing the ionic strength. This ternary complex is retained on nitrocellulose membranes. On polyacrylamide...
Bovine insulin can be split into several fractions by gel filtration on Sephadex G50. These are, in order of decreasing molecular weight, a new unidentified substance, proinsulin, and a large fraction containing several substances. Ultracentrifugal examination of the proinsulin in acetic acid solution (pH 2.3) gave a molecular weight of 9300 and evidence of an association-dissociation equilibrium.
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