[Changes in the concentration of extracellular products and their composition in a synchronous culture of Chlorella pyrenoidosa in the presence of light and an elevated 02 concentration].

An increase of oxygen concentration in a gaseous mixture passed through cell suspensions of Chlorella pyrenoidosa (from 21 to 100%) stimulates the production of extra-cellular organic substances and changes their composition. The cells accumulate in the medium glycolic acid rather than a variety of other substances. The accumulation of glycolic acid depends on the growth stage of the cells. The relation of production of extracellular organic substances by the algal cells to the ratio between the carboxylase and oxgenase activities of ribulose diphosphate carboxylase is discussed.