Abstract
AbstractSoluble ribonucleic acid of brewer's yeast was fractionated by countercurrent distribution and assayed for certain amino‐acid acceptor activities, as well as for cytokinin activity, using both tobacco pith callus tissue and Scorzonera crown‐gall tissue.An undetermined fraction of ribonucleic acid, rich in cytokinin and similar to one previously reported for baker's yeast, was observed. Two species of cytokinins, probably different from isopentenyl adenine, were detected in other ribonucleic acid fractions by comparing their activities on the two tissues used in growth tests. They do not seem to be located in any of the specific amino‐acid accepting transfer ribonucleic acids determined in this study.
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