haem
haem (heme) An iron-containing molecule (see formula) that binds with proteins as a
cofactor or
prosthetic group to form the
haemoproteins. These are
haemoglobin,
myoglobin, and the
cytochromes. Essentially, haem comprises a
porphyrin with its four nitrogen atoms holding the iron(II) atom as a chelate. This iron can reversibly bind oxygen (as in haemoglobin and myoglobin) or (as in the cytochromes) conduct electrons by conversion between the iron(II) and iron(III) series.
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Anniversaries
Newspaper article from: The Independent - London; 5/13/1996; 538 words
; ...Bohemia, 1717; John VI, King of Portugal, 1769; Pierre- Narcisse, Baron Guerin, painter, 1774; Henry Crabb Robinson, diarist...Sir James Thornhill, painter, 1734; Georges, Baron Cuvier, zoologist and statesman, 1832; John Nash...
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