. Bacterial photosynthesis. Bacteria -- Physiology; Photosynthesis. METABOLIC ASPECTS 137 200 B, "GLUTAMATE CELLS". 100 200 MINUTES 20 40 60 80 100 MINUTES 'resting' cells of R. rtibrum de- I- glutamate (B.) medium. After Fig. 1. Kinetics of photoproduction of H2 by rived from a malate + NH4''" (A.) or malate Ormerod and Gest (13). In A., the cells were harvested while ammonia was still present in the cul- ture medium. Except for the endogenous control in B., L-malate was added at zero time. For other experimental details, see ref. 13. apparatus from the complex cellular matrix
. Bacterial photosynthesis. Bacteria -- Physiology; Photosynthesis. METABOLIC ASPECTS 137 200 B, "GLUTAMATE CELLS". 100 200 MINUTES 20 40 60 80 100 MINUTES 'resting' cells of R. rtibrum de- I- glutamate (B.) medium. After Fig. 1. Kinetics of photoproduction of H2 by rived from a malate + NH4''" (A.) or malate Ormerod and Gest (13). In A., the cells were harvested while ammonia was still present in the cul- ture medium. Except for the endogenous control in B., L-malate was added at zero time. For other experimental details, see ref. 13. apparatus from the complex cellular matrix may result in significant alteration or even total loss of certain biochemical characteristics. Remarks on the absence of oxygen production in bacterial photosyn- thesis Before the discovery of light-inducedphosphorylation, the similari- ties and differences in the autotrophic metabolism of green plants and photosynthetic bacteria could be visualized mainly in terms of forma- tion and subsequent fate of a photoreductant and a photooxidant. Ac- cording to the concept developed by van Niel (2), the photoreductant would be used for reducing CO2 in both types of organisms, while dis- posal of the photooxidant presumably occurs through alternative routes, , conversion to O2 in green plants and reduction of the po- tential 02-precursor by the accessory electron donor in the bacteria. An appealing experimental system for investigating this hypothesis is furnished by green algae which can switch by '^anaerobic adapta- tion" from typical green plant photosynthesis to a bacterial-type of photoreduction of CO2 with H2 (42). The change is reversible in that O2 formation is resumed if the anaerobic algae are exposed to high light intensities. In a recent extension of studies with such organisms. Bishop (43) has isolated a mutant of Scenedesmus obliquus which. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability -
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