. Biological structure and function; proceedings. Biochemistry; Cytology. PHOTOSYNTHETIC PHOSPHORYLATION AND THE ENERGY CONVERSION PROCESS 377 nitrogen into cellular substance or for the photoproduction of hydrogen gas. s, + 2OH - light light S + SOr + 2e- + H2O S + 80H - -^^ SO = + 6f - + 4H2O loHoO V 10H++10OH- Sum: So03= + 5H0O ^^ zSO^ + 8e - + loH + The photoproduction of hydrogen gas approached the stoicheiometry of the first reaction, for one molecule of thiosulphate used, two elec- trons and two protons were combined with the aid of hydrogenase and evolved as Hg. ' PHOTOPRODUCTI
. Biological structure and function; proceedings. Biochemistry; Cytology. PHOTOSYNTHETIC PHOSPHORYLATION AND THE ENERGY CONVERSION PROCESS 377 nitrogen into cellular substance or for the photoproduction of hydrogen gas. s, + 2OH - light light S + SOr + 2e- + H2O S + 80H - -^^ SO = + 6f - + 4H2O loHoO V 10H++10OH- Sum: So03= + 5H0O ^^ zSO^ + 8e - + loH + The photoproduction of hydrogen gas approached the stoicheiometry of the first reaction, for one molecule of thiosulphate used, two elec- trons and two protons were combined with the aid of hydrogenase and evolved as Hg. ' PHOTOPRODUCTION OF Hj FROM THIOSULFATE —I r T 1 I ^moles thiosulfate added-~ 10. -o-o- none ~~ 10 (heated cells) 10 20 30 40 50 minutes Fig. 20. Photoproduction of hydrogen gas by Chromotiimi cells as a function of added thiosulphate. The control treatment contained cells that have been heated at loo^ for lo min. Other experimental conditions are described for Fig. i6 (Losada, Nozaki, and Arnon [136]). With succinate as the electron donor, the proposed sequence of reac- tions which results in the photoproduction of hydrogen is represented as follows: Succinate + zFe^ +cyt > fumarate + zFe- +cvt + 2H + 2Fe2+cyt + 2[Chl] -> 2Chl + 2Fe'^ ^cvt light 2Chl—^-^2[Chl]++2e 2f'- + 2H + '!I^!Z!!:!!^H2 Sum: succinate light > fumarate + H.,. 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 IUB/IUBS International Symposium (1st : 1960 : Stockholm); International Union of Biochemistry; International Union of Biological Sciences; Goodwin, T. W. (Trevor Walworth); Lindberg, Olov, 1914-. London, New York, Academic Press
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