Abstract
The rate of reduction of human ferrihemoglobin A in the presence of cysteine is studied as a function of hemoglobin level, cysteine level, temperature, pH, ionic strength, stereospecificity, atmospheric composition and method of isolation of the hemoglobin. A mechanism for the cysteine reduction of ferrihemoglobin is suggested.CO inhibits the reduction. In the absence of other reductants ferrihemoglobin is reduced in the presence of CO alone. The rate of CO reduction is accelerated by ultraviolet light. Evidence is presented for the formation of a ferrihemoglobin-ammonia complex in aqueous solution. Extinction coefficients are given for several hemoglobin compounds at various wavelengths.
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