Effects of CO2 concentration during growth on subsequent photosynthetic CO2 fixation in Chlorella1 |
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Authors: | Hogetsu Daisuke; Miyachi Shigetoh |
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Institution: | 2 Radioisotope Centre, University of Tokyo Tokyo, Japan
3 Institute of Applied Microbiology, University of Tokyo Tokyo, Japan
4 Tokyo Metropolitan Isotope Research Centre Tokyo, Japan |
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Abstract: | The maximum rate of photosynthetic 14CO2 fixation (Vmax) aswell as the concentration of CO2 at which the rate of photosynthetic14CO2 fixation attains one-half its maximum velocity (Km) inChlorella vulgaris 11h cells was strongly dependent on the concentrationof CO2 continuously provided during the algal growth. The Vmax (µmoles 14CO2 fixed/ml pcv?min) and Km (% CO2)of the algal cells which had been grown in air containing 4%CO2 (by volume) were ca. 10 and 0.150.17, while thosein the cells which had been grown in ordinary air (containing0.04% CO2) were 7 and 0.050.06, respectively. When the concentration of CO2 in the bubbling gas was loweredfrom 4 to 0.04% during the algal growth, their photosynthetickinetics attained the respective lower steady levels after 510hr. On the other hand, when the photosynthetic kinetics weredetermined 24 hr after raising the concentration of CO2 from0.04 to 4%, the Vmax and Km-values were found to have alreadyattained the respective higher levels. (Received October 15, 1976; ) |
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