Abstract
1. Sperm-whale ferrimyoglobin was found to contain 0·308% of Fe, on a dry weight basis, corresponding to a molecular weight of 18130. The solid takes up moisture to an equilibrium state, and was then assayed to contain 0·280% of Fe. 2. Absorption spectra are presented for acidic ferrimyoglobin, Fe+(H2O), and its conjugate base, Fe–OH, as well as for the fluoride and cyanide complexes, within the range 200–2500mμ. Data for ferromyoglobin–carbon monoxide, Fe(II)–CO, in the visible region are also included. 3. Minor spectral differences have been found between whale and horse myoglobins, particularly in the effect of temperature on the visible-absorption spectrum of Fe–OH.
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