OXIDATION-REDUCTION POTENTIALS OF THE METHEMOGLOBIN-HEMOGLOBIN SYSTEM IN CONCENTRATED UREA SOLUTION
نویسندگان
چکیده
منابع مشابه
Studies on the Oxidation-reduction of Hemoglobin and Methemoglobin
Hemoglobin is oxidized to methemoglobin by products formed during the oxidation of a number of different substances. With some of these substances, both oxygen consumption and hemoglobin oxidation are accelerated by thermolabile constituents of pneumococci; with others of the easily oxidized substances, neither reaction seems to be influenced by the presence of the bacterial substances. The sam...
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The dissociation of the horse hemoglobin molecule into 2 half molecules in 4 M urea solutions has been well established (16). The effect of concentrated urea on the equilibrium between oxygen and hemoglobin has, however, not been determined. The present experiments const.itute a study of this equilibrium. The reaction between oxygen and hemoglobin is best described if it is assumed that 4 molec...
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The potentiometric method was applied to the study of the influence of cyanide and of hydroxyl ion on methemoglobin. Both of these ions appear to combine with the iron of the methemoglobin molecule and reduce its oxidant activity. From the magnitude of the effect produced by cyanide and by variation in pH on the oxidation-reduction potential of the methemoglobin-hemoglobin system, it is conclud...
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The similarity in composition and function between myoglobin and hemoglobin has prompted numerous comparisons of the physicochemical properties of these two important biological pigments (8). Quantitative differences in their molecular weights (12, 14, 18), solubilities (9), absorption spectra (19), and equilibria with oxygen or carbon monoxide (6, 20) have been established. The presence in bot...
متن کاملOxidation-reduction potentials of the triphosphopyridine nucleotide system.
Triphosphopyridine nucleotide serves as the primary hydrogen or electron acceptor in a variety of biological oxidations. Some dehydrogenases like glucose g-phosphate dehydrogenase (1) and isocitric acid dehydrogenase (2) have an absolute requirement for TPN. Other systems such as liver glutamic acid dehydrogenase (3, 4) can utilize either TPN or DPN about equally well. In addition, a large numb...
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ژورنال
عنوان ژورنال: Journal of Biological Chemistry
سال: 1942
ISSN: 0021-9258
DOI: 10.1016/s0021-9258(18)72550-7