Competent cultures of Bacillus subtilis 168 have been fractionated into a high-competent and a low-competent fraction by a large-scale separation technique. Membrane vesicles isolated from both cell fractions are equally active in the transport of L-glutamate. Both membrane vesicle preparations seem to have similar endo- and exonuclease activities. Also, both preparations are capable of binding...

Plant ribonucleic acids which have high adenosine monophosphate concentrations were studied. Purified deoxyribonucleic acid-like ribonucleic acid and tenaciously bound ribonucleic acid fractions both contained poly-adenosine monophosphate sequences (those from the latter being longer than those from the former); without these poly-adenosine monophosphate sequences their base compositions were t...

Human lymphocytes were stimulated in vitro by phytohemagglutinin, concanavalin A, pokeweed mitogen, purified protein derivative-tuberculin, and allogenic cells. The deoxyribonucleic acid synthesis of the lymphocytes was inhibited in increasing degree by 4 to 8 mug of amphotericin B per ml of culture irrespective of lymphocyte stimulant used. The effect of clotrimazole on the deoxyribonucleic ac...

While investigating the effects of structural analogues of thymine on the thymine-requiring strain of E&cherichia coli 15 T we noticed the presence in the bacterial deoxyribonucleic acid of a new base which we have identified as 6-methylaminopurine. Although 6-methylaminopurine is usually present in small amounts (2% of the adenine) in the deoxyribonucleic acid of E. coli 15 Tits relative propo...