heme

Type: Term Pronunciation: hēm Definitions: 1. The porphyrin chelate of iron in which the iron is Fe(II) (or Fe2+); the oxygen-carrying, color-furnishing, prosthetic group of hemoglobin. 2. Iron complexed with nonporphyrins but related tetrapyrrole structures (biliverdin heme). 3. Iron chelated with any porphyrin, irrespective of the valence st
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heme

[n] - a complex red organic pigment containing iron and other atoms to which oxygen binds
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heme

haem Complex consisting of an iron ion coordinated to a porphyrin acting as a tetradentate ligand, and to one or two axial ligands. After [3]
Found on http://sis.nlm.nih.gov/enviro/iupacglossary/glossaryh.html

heme

See haem.
Found on http://www.encyclo.co.uk/visitor-contributions.php

heme

Synonym for haem ... 1. <biochemistry> Compounds of iron complexed in a porphyrin (tetrapyrrole) ring that differ in side chain composition. Haems are the prosthetic groups of cytochromes and are found in most oxygen carrier proteins. ... 2. <prefix> haem-, eaning relating to blood. ... Origin: G. Haima ... (21 Jun 2000) ...
Found on http://www.mondofacto.com/facts/dictionary?heme

heme

(hēm) the nonprotein, insoluble, iron protoporphyrin constituent of hemoglobin, of various other respiratory pigments, and of many cells, both animal and vegetable. It is an iron compound and constitutes the pigment portion or protein-free part of the hemoglobin molecule, and is responsible for its oxygen-car...
Found on http://www.encyclo.co.uk/local/21001

heme

(from the article `hemoglobin`) Each hemoglobin molecule is made up of four heme groups surrounding a globin group, forming a tetrahedral structure. Heme, which accounts for only 4 ... ...Hemoglobin is a protein; a molecule contains four polypeptide chains (a tetramer), each chain consisting of more than 140 amino acids. To each ... ...
Found on http://www.britannica.com/eb/a-z/h/35

heme

The heme unit of which there are four in each hemoglobin molecule is planar porphyrin structure, linked to the globin proteins which make up the bulk of the hemoglobin molecule via the amino acid histidine, part of which is shown here above the plane of the porphyrin ring. The histidine coordinates ...
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heme

heme: see coenzyme.
Found on http://www.infoplease.com/ce6/sci/A0914275.html

heme

(hem) The iron-containing red pigment that, together with the protein globin, forms hemoglobin.
Found on http://www.mhhe.com/biosci/abio/glossary.mhtml

heme

(hem) The iron-containing red pigment that, together with the protein globin, forms hemoglobin.
Found on http://www.mhhe.com/biosci/abio/glossary.mhtml

heme

The part of certain molecules that contains iron. The heme part of hemoglobin is the substance inside red blood cells that binds to oxygen in the lungs and carries it to the tissues.
Found on http://www.cancer.gov/dictionary?expand=H

Heme

A heme (American English) or haem (British English) is a chemical compound of a type known as a prosthetic group consisting of an Fe2+ (ferrous) ion contained in the centre of a large heterocyclic organic ring called a porphyrin, made up of four pyrrolic groups joined together by methine bridges. Not all porphyrins contain iron, but a substantial
Found on http://en.wikipedia.org/wiki/Heme

HEME

the iron-based pigment in red blood cells, a component of hemoglobin that is released when red blood cells are broken down.
Found on http://www.encyclo.co.uk/local/22225
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