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- W1994583804 abstract "Reactions of metal-substituted myoglobins with excess electrons in electron-pulse-irradiated aqueous solutions at room temperature and γ-irradiated aqueous matrices at 77 K were studied for the purpose of probing the functional role of heme iron. The rate constants for the reactions of various myoglobins with hydrated electrons were not much different from each other, and were close to those of diffusion-controlled reactions. In contrast, the reduction rates of myoglobins with dithionite depended markedly on the kind of central metals in the myoglobins. The difference was interpreted in terms of Marcus' theory for electron-transfer reactions. Effects of the 6-coordinate structure of the cobalt(III) species on the reaction with dithionite was also discussed. The steady-state optical-absorption measurements of γ-irradiated matrices containing cobaltimyoglobin at 77 K demonstrated the reduction of cobalt(III) species by excess electrons produced by the action of ionizing radiation. It was shown, by electron-spin resonance spectroscopy, that a 6-coordinated cobalt(II) species produced at 77 K transformed to a 5-coordinate one at higher temperatures, as reported previously. However, structural relaxation was not observed by optical spectroscopy either in the solutions or in the low-temperature matrices. It was concluded, therefore, that the intermediate 6-coordinate cobalt(II) species gave an optical absorption spectrum which was indistinguishable from that of the relaxed 5-coordinate cobalt(II) species." @default.
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- W1994583804 date "1990-01-01" @default.
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- W1994583804 title "Reactions of metal-substituted myoglobins with excess electrons studied by pulse radiolysis and low-temperature gamma-radiolysis" @default.
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- W1994583804 doi "https://doi.org/10.1016/1359-0197(90)90163-c" @default.
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