The occurrence of 5-methyluridine in bacterial ribonucleic acid1 and in rat liver slices incubated with thymine2 raises the problem of how this nucleoside and its possible derivatives are synthesized. One pathway apparently involves the reaction of ribose-l-phosphate and thymine in the presence of a nucleoside phosphorylase that has been found in bacterial3 and animal tissue extracts.4 5 Anothe...

A detailed study of the mechanism by which a proton is lost from a dication reveals that such processes are more complicated than is often assumed. In many cases, a deprotonation reaction is best viewed as a two-stage process: Initially, the departing unit is better described as a hydrogen atom than as a proton and only later, at some point further along the decomposition pathway, does a sponta...

The reaction of the cyano radical with 1-pentene has been studied in crossed molecular beams experiments at a range of collision energies from 5 to 9 kcal/mol. In these studies, the pentenyl radical product is probed using singlephoton ionization at 157 nm, and the product flux contourmap is obtained directly using DC slice imaging. The results clearly demonstrate the presence of the hydrogen a...