. Bacterial photosynthesis. Bacteria -- Physiology; Photosynthesis. REACTION CENTERS IN PHOTOSYNTHESIS 379 ratio of P700 to Chi a is about 1:400, in harmony with the size of a photosynthetic unit as determined by flashing light experiments. There is one molecule of Cyt/present for each molecule of P700 (approxi- mately) in chloroplasts (16). The Cyt/ (potential 365 mv) is also oxi- dized reversibly by illumination (19), Partially purified preparations of P700, obtained by extracting chloroplasts with acetone, retain the Cyt/ in a 1:1 ratio to P700. In these preparations the light reaction of P
. Bacterial photosynthesis. Bacteria -- Physiology; Photosynthesis. REACTION CENTERS IN PHOTOSYNTHESIS 379 ratio of P700 to Chi a is about 1:400, in harmony with the size of a photosynthetic unit as determined by flashing light experiments. There is one molecule of Cyt/present for each molecule of P700 (approxi- mately) in chloroplasts (16). The Cyt/ (potential 365 mv) is also oxi- dized reversibly by illumination (19), Partially purified preparations of P700, obtained by extracting chloroplasts with acetone, retain the Cyt/ in a 1:1 ratio to P700. In these preparations the light reaction of P700 persists, but that of Cyt/is absent (16). The reversible bleaching at 700 m^, in partially purified P700 preparations, is accompanied by a bleaching at 432 mfi. This has led Kok (16) and others (7,20) to suggest that P700 is a chlorophyll-like pigment, perhaps Chi a in a specialized environment. The light-induced oxidations of P700 and Cyt occur irreversibly at liquid nitrogen temperature (7). At room temperature a brief flash of light elicits a transitory oxidation of P700, the re-reduction requir- ing about 1 msec, Witt et al. (7) report that under these conditions the appearance of oxidized Cyt parallels the disappearance of oxidized Electrons to PPNR, Electron flow for cyclic phosptiorylotion Electrons from System n. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Symposium on Bacterial Photosynthesis (1963 : Yellow Springs, Ohio); Charles F. Kettering Research Laboratory (Yellow Springs, Ohio); Gest, Howard. Yellow Springs, Ohio, Antioch Press
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