Otto Heinrich Warburg

Scientist German Empire 1883–1970

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Catalytic oxidation in living substances rests upon change of valency in an iron compound which is the respiratory oxygen-transferring ferment.
Otto Heinrich Warburg
Green, red, and mixed shades of haemins are known. If magnesium is replaced by iron in chlorophyll, green haemins are obtained. Their colour is due to a strong band in the red which is already recognized in chlorophyll.
Otto Heinrich Warburg
The concentration of the ferment iron in living substance is very small, being in the region of 1 g to 10 million g of cellular substance.
Otto Heinrich Warburg