Download Advances in Catalysis, Vol. 14 by D.D. Eley, Herman Pines, Paul B. Weisz (Eds.) PDF
By D.D. Eley, Herman Pines, Paul B. Weisz (Eds.)
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Studies of the decomposition of formic acid on both base and noble metals showed that generally the change in reaction order, attending it change in experimental conditions, may be explained as has been done above for platinum. For the particular case of nickel this was shown by Fahrenfort et al. (12). This suggests that the first reaction step on all metals is the adsorption of formic acid, and that the adsorbed intermediate decomposes in the reaction products which desorb from the surface. The coverage (lifetime) of the intermediate on the surface will determine the reaction order observed under certain conditions of temperature and pressure.
The alternative step of electron transfer from donor to excited chlorophyll has also been suggested as a primary step (57). A discussion of these two alternatives originally led us to the present suggestion as the more likely of the two. The existence of two different primary quantum acts (48-51, 57, 65, 71-73) makes it not unlikely that both of these two alternatives may occur, although either one alone would be sufficient to support the whole process. Therefore, a separation of charge has been achieved and the oxidized QUANTUM CONVERSION IN CHLOROPLASTS 31 donor becomes an oxidant and the electron in the quinone is the reductant.
86, 648 (1969); 38, 161 (1961); Soi. American June (1962). 6. Bassham, J. , Comp. Biochem. Phyeiol. 4, 187 (1962). , Science 135, 879 (1962). 7. van Niel, C. , in “The Microbe’s Contribution to Biology” (A. J. Kluyver and C. B. ), p. 155. Harvard Univ. Press, Cambridge, Massachusetts, 1966. 8. Amon, D. , Nature 184, 10 (1959). 9. Arnon, D. I. i n “Light and Life” (W. D. McElroy and B. ), p. 489. Johns Hopkins Prkss, Baltimore, Maryland, 1961. 10. Stanier, R. , Bacteriol. Rev. 25, I (1961). 11. , J.