[Decarboxylase activity and biosynthetic processes in Saccharomyces carlsbergensis exposed to light].

Light at a wavelength from 410 to 520 nm was found to stimulate the activity of decarboxylase, protein biosynthesis and the yield of biomass in Saccharomyces carlsbergensis. Pyruvate decarboxylation yielding a substrate for the di- and tricarboxylic acid cycle is a limiting step in the metabolism of the yeast. Light can activate the process, thus eliminating the substrate deficiency of the cycle and increasing the rate of anabolic processes.