have been prepared and studied for possible incorporation into polynucleotides. Arab inosylcytosine mono-, di-, and triphosphates were synthesized by both chemical and enzymatic methods. Labeled and unlabeled arabinosylcytosine nucleotides were tested for their capacity to serve as substrates for purified polynucleotide phosphorylase, deoxyribonucleic acid-dependent ribonucleic acid polymerase,...

The effects of various metabolic inhibitors on the motility of Spirochaeta aurantia were investigated. After 15 min in sodium arsenate buffer, 90% of cells remained motile even though adenosine triphosphate levels dropped from 5.6 to 0.1 nmol/mg (dry weight) of cells. After 70 min in sodium arsenate, 5% of cells were motile. Addition of phenazine methosulfate plus ascorbate at this time resulte...

UNLABELLED The purpose of this study was to measure myocardial buffering capacity and adenosine triphosphate utilization rates in the newborn animal in vivo during hypothermic circulatory arrest and recovery. METHODS These studies were performed with 31P magnetic resonance spectroscopic techniques, which supplied a 12- to 16-second time resolution, to monitor intracellular pH and phosphocreat...