Abstract
Photoactive whole cells were isolated for the first time from a red alga, Galaxaura falcata KJELLMAN, of the Chaetangiaceae. By means of proton uptake experiments, its optimum irradiation intensity required for photosynthesis, effects of Ca2+, Mg2+, Mn2+ and Na+ both mono- and divalent ions, uncouplers and a non-ionic surfactant were examined. Photochemical 14CO2 fixation under different monochromatic irradiation, and RuDP and PEP carboxylase activities in the cells were also studied and compared with those of thallus extracts. These results demonstrated the isolated cells to be biochemically active. An electron microscope study of the isolated whole cells was also performed.
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