Some tetrapyrroles are the active cores of some compounds with crucial biochemical roles in living systems, such as hemoglobin and chlorophyll). In these two molecules, in particular, the pyrrole macrocycle ring frames a metal atom, that forms a coordination compound with the pyrroles and plays a central role in the biochemical function of those m...
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http://en.wikipedia.org/wiki/Tetrapyrrole
(from the article `coloration`) ...nitrogenous 16-membered ring, or cyclic, compounds is referred to as porphyrins. The elementary structural unit of all porphyrins is a large ring ...
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http://www.britannica.com/eb/a-z/t/30
A molecule containing four pyrrole nuclei; e.g., porphyrin. ... (05 Mar 2000) ...
Found on
http://www.encyclo.co.uk/local/20973
Type: Term Pronunciation: tet′ră-pir′ōl Definitions: 1. A molecule containing four pyrrole nuclei; porphyrin.
Found on
http://www.medilexicon.com/medicaldictionary.php?t=91070
No exact match found.
