coumarin dissolved in acetone or dichloromethane (1), might nevertheless be expected. A nonvolatile test chemical would still be retained on surfaces exterior to the embryo after evaporation of the solvent. Subsequent imbibition by the seeds in water would then introduce the test chemical into the embryo just as readily as if the test chemical had originally been in aqueous solution. LARRY L. T...

The rates of reaction with nitrous acid of four methylsubstituted piperidines to form the corresponding Nnitrosopiperidines were compared with that of piperidine. The relative rates for piperidine, 2-methyl-, 2,6-dimethyl-, and 2,2,6,6-tetramethyl-piperidine were approximately 100:20:10:1, showing considerable steric hindrance tp nitrosation by the «methyl groups. The rate of formation of nitr...

At neutral pH, S-nitrosoglutathione was formed by the reaction of reduced glutathione and sodium nitrite. The degradation of S-nitrosoglutathione, presumably by transnitrosation/denitrosation, was catalyzed by L-cysteine, or CoA-SH. Additionally, from the crude extract of rat brain, one protein with a large molecular mass was nitrosolated with nitrite, and was split into duplet peptides noted i...