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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.

Catalysts offer the promise of making chemical transformations far less polluting.

The distinction between the old and the new formulations consisting in the incorporation of the concept of the rate of chemical reactions is so great that it immediately asserted itself in the objective development of catalysis.

If we introduce iron complexly into ooporphyrin, we obtain haemin.

By combining chemical, biochemical and physical techniques, it has thus become possible to investigate the nature of enzymic catalysis in a novel manner, complementary to the other approaches which have developed over the same period.

The toxic effect of carbon monoxide on man has nothing to do with inhibition of cellular respiration by carbon monoxide but is based on the reaction of carbon monoxide with blood iron.

The development of a rational view of the nature of catalysis was thus absolutely dependent on the creation of the concept of the rate of chemical reaction.

Activating oxygen can produce compounds called radicals that put oxidative stress on cells. Such stress could ultimately lead to cancer and other diseases.

Idleness is to the human mind like rust to iron.