Utilization of Free and Acetylated l- and dl-Tryptophane by Oidium Lactis

Plant Growth-Substances. Their chemistry and applications, with special reference to synthetics

“…/-indolyl-lactic acid was the only one of several indole compounds prepared by Bauguess and Berg (1934) that was inactive as a growth-substance (Bauguess, 1935). With one exception it appears to be the only substance capable of optical activity or resolution (other than /-tyrosine and /-tryptophan) of which the growth-regulating activity has been tested, hence nothing can be said at present about the relative growth-regulating power of most optical isomers.…”

The Influence of Optical Activity on the Utilization of Tryptophane for Growth by the Diphtheria Bacillus

“…The use of the optical modifications of tryptophane in metabolism studies of microorganisms has recently received some attention. Oidium lactis has been found to utilize 1and dl-tryptophane equally well when they serve as the sole source of nitrogen in the medium (Bauguess and Berg, 1934). Escherichia coli, on the other hand, oxidizes the laevo form readily, but attacks the dextro isomer only slowly, if at all (Woods, 1935).…”