Titration of the 695 nm band of ferricytochrome c has been fitted by a model involving four ionic species over the pH range 0–11. A co‐operative effect between protein denaturants and pH has been observed in the bleaching of the 695 nm band. This effect is discussed in terms of a conformational change and protein titration data suggest this to be of a limited nature. Circular dichroism and magnetic circular dichroism studies have revealed that the 695 nm absorption band has an associated, well defined dichroism. Magnetic circular dichroic spectra are discussed in terms of haem symmetry.
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Greenwood et al. (1971) studied this question.
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