A QUICKLY REACTING FORM OF HAEMOGLOBIN 303 reacting haemoglobin (Hb*) is formed. If p- chloromercuribenzoate is added almost all the reduced haemoglobin formed is Hb*. At alkaline pH the chief product of photolysis is Hb* even in the absence of p-chloromercuribenzoate. 3. At alkaline pH Hb* reverts spontaneously to ordinary haemoglobin with a velocity constant of about 200 sec.-' at 10. 4. The second-order velocity constant for the combination of Hb* with carbon monoxide is 1-8 x 106M-1 sec.-' at 1and the activation energy 5-6 kcal.
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Lake et al. (1959) studied this question.
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