Fig. 3.

Relative growth rate A. platensis cells grown under varying air pressure, in 100 % CO₂ for 3 days, calculated as the relative increase of OD 750 in ratio to the relative increase of the control cultures grown under ambient air. All cultures were stirred at 100 rpm rate. Final pH of the cultures is marked above the bars. The initial pH of the cell suspensions, prior to the culturing, was 9.38