Abstract
Light-energy absorption by Microcystis aeruginosa with and without gas vacuoles was observed, respectively by using an integrating sphere photometer. As far as the concentration of cell suspension of the order of 106∼7 cells/ml in this work was concerned, the performance of gas vacuoles to shield incident light was most unlikely. Referring to a correlation secured by the integrating sphere photometer between light absorption and cell concentration of the suspension, a turbidostat culture of the blue-green alga demonstrated that the growth efficiency, YkJ defined as g cells harvested per kJ of light energy absorbed by the cells was nearly 0.004. This value of YkJ was almost the same as that of Spirulina platensis.
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