. Bacterial photosynthesis. Bacteria -- Physiology; Photosynthesis. PHOTOOXIDATION AND PHO TOR EDUCTION REACTIONS 253 g i TEMPERATURE "C FUMARATE ADDED NAD ADDED Fig. 14. Heat stability of DPIPH2 photooxidation reactions with R. nthrion chromatophores. The experimental condi- tions outlined for Fig. 1 were employed with mgof BChl present. The chromatophores were heated at the indicated temperature for 5 minutes before addition to the reaction system and commencement of the illumination period. The photooxidation reactions were run at the usual temperatures. The rates for th
. Bacterial photosynthesis. Bacteria -- Physiology; Photosynthesis. PHOTOOXIDATION AND PHO TOR EDUCTION REACTIONS 253 g i TEMPERATURE "C FUMARATE ADDED NAD ADDED Fig. 14. Heat stability of DPIPH2 photooxidation reactions with R. nthrion chromatophores. The experimental condi- tions outlined for Fig. 1 were employed with mgof BChl present. The chromatophores were heated at the indicated temperature for 5 minutes before addition to the reaction system and commencement of the illumination period. The photooxidation reactions were run at the usual temperatures. The rates for the slow reactions were multiplied by 10 in order to place them on the same scale as the fast reactions. tional part of the entire electron transport system for the observed fast reaction. The stability of the fast reaction reported here agrees with the previously reported stability of the aerobic photooxidation of DPIPH2 as reported by Lindstrom (6). The rates of various related dark enzymatic reactions for chroma- tophores of R. nibnim and Chromatium are given in Table 4. These are the various dark enzymatic reactions which might be expected to influence the photoreactions under investigation. The R. rubrum chromatophores have a very potent NADH-DPIP diaphorase, which is most likely the enzyme which has been studied in some detail by Horio and Kamen (36). R. nibnim has very weak DPIPH2 oxidase activity and a moderate NADH oxidase activity. Chromatium also has a potent NADH-DPIP diaphorase activity, and has a very active DPIPH2 oxidase activity. This is surprising because this organism lives under anaerobic conditions and does not practice a respiration involving oxygen, where a terminal oxidase would be expected to 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 Photosynthes
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