from studies of ( a ) the yield of reactions ( 1 ) and ( 2 ) at variable [ haemoglobin ] and rates of production of o2- , ( b ) their suppression by superoxide dismutase , and ( c ) equilibria observed with mixtures of oxyhaemoglobin and methaemoglobin , it is shown that k1/k2=0.7 +/- 0.2 and k1 = ( 4 +/- 1 ) x 10 ( 3 ) m-1-s-1 at ph7 , and k1 and k2 decrease with increasing ph .
C0019046
haemoglobin
C0025635
methaemoglobin