[Characteristics of different growth stages of the blue-green alga Anacystis nidulans (Synechococcus)].

The rate of growth of the blue-green alga Anacystis nidulans is highest during the first 5--8 days but the number of the cells increases up to 30 days when the stationary phase takes place (30--60 days). The content of chlorophyll is almost constant during the first 20 days of growth while the content of phycocyanin increases; then the content of the both pigments decreases. The rate of O2 evolution and the rate of electron transport to ferricyanide decrease exponentionally during the first 10 days of growth. The rate of endogenous respiration and the rate of O2 absorption, induced by methylviologen in the light in the presence of DCMU decrease more slowly. At the same time, the rate of O2 absorption in the presence of methylviologen without DCMU and the rate of TTC reduction in the darkness increase and later decrease. The rate of TTC reduction in the light increases up to 30--40 days and then decreases. The rate of the cell death in the darkness decreases when the age of the "light" culture is 50 days. Addition to the medium of its main components does not increase the rate of growth of the culture after 10 days of its growth. Addition of CaCl2, glucose, and asparagic acid increases the rate of growth of the 3-day-old culture. Addition of phosphorus inhibits growth. Argon favours growth of the culture. The cells are rapidly discoloured in conditions of hampered gas exchange; they die rapidly also in the presence of DCMU, methylviologen, and KCN.