RT Journal Article SR Electronic(1) A1 Silva, Humberto J. A1 Pirt, S. JohnYR 1984 T1 Carbon Dioxide Inhibition of Photosynthetic Growth of Chlorella JF Microbiology, VO 130 IS 11 SP 2833 OP 2838 DO https://doi.org/10.1099/00221287-130-11-2833 PB Microbiology Society, SN 1465-2080, AB Chlorella cultures were grown in a tubular loop reactor which facilitated both irradiation of the culture and gas mixing compared with a conventional stirred vessel with vortex aeration. Measurements of the inhibition of maximum specific growth rate (proportional to photosynthetic rate) in the tubular reactor showed that CO2 behaves as a typical inhibitory substrate at partial pressures (PCO2 ) up to 0·6 atm. The PCO2 for 50% reduction in maximum specific growth rate was 0·36 atm. At 0·6 atm there was a discontinuity in the inhibitory effect with a sharp increase in the inhibitory effect at higher PCO2 values. Cultures rapidly adjusted to step changes in the PCO2 up to 0·6 atm. At a PCO2 of 1 atm inhibition was complete but the inhibitory effect was readily reversed., UL https://www.microbiologyresearch.org/content/journal/micro/10.1099/00221287-130-11-2833