CO2 ASSIMILATION IN A THERMOPHILIC CYANOBACTERIUM

A thermophilic cyanobacterium, Synechococcus elongatus, grew in the mi neral medium supplied with gas containing CO2 of concentration from 0. 04 to 60%.,Mechanism of growth repression by high CO2 was discussed. L ipid and fatty acid compositions of the cytoplasmic and thylakoid memb ranes from this cyanobacterium were analyzed as products from CO2. Com pared with mesophilic cyanobacteria, the Synechococcus membranes conta ined more pigments, less phosphatidylglycerol and more saturated fatty acids, and showed simpler profiles of fatty acid compositions.