| haddock | <zoology> A marine food fish (Melanogrammus aeglefinus), allied to the cod, inhabiting the northern coasts of Europe and America. It has a dark lateral line and a black spot on each side of the body, just back of the gills. Galled also haddie, and dickie. Norway haddock, a marine edible fish (Sebastes marinus) of Northern Europe and America. See Rose fish. Origin: OE. Hadoc, haddok, of unknown origin; cf. Ir. Codog, Gael. Adag, F. Hadot. Source: Websters Dictionary (01 Mar 1998) |
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| hade | <chemical> The inclination or deviation from the vertical of any mineral vein, fault, or lode. Origin: Cf. Heald inclined, bowed down, G. Halde declivity. Source: Websters Dictionary (01 Mar 1998) |
| Hadfield, Geoffrey | <person> British physician, *1889. See: Clarke-Hadfield syndrome. (05 Mar 2000) |
| hadron | <physics> Any of over 100 elementary particles that are the building blocks of atomic particles such as protons and neutrons. (09 Oct 1997) |
| hadrosaurus | <paleontology> An American herbivorous dinosaur of great size, allied to the iguanodon. It is found in the Cretaceous formation. Origin: NL, fr. Gr. "adros thick + say^ros lizard. Source: Websters Dictionary (01 Mar 1998) |
| Hadrurus | A genus of scorpions found in the southwestern U.S., characterised by numerous setae on the stinger; the commonest species is Hadrurus arizonensis, the olive hairy scorpion. See: Scorpionida. Origin: G. Hadros, thick, stout, + ouro, tail (05 Mar 2000) |
| Haeckel's gastrea theory | That the two-layered gastrula is the ancestral form of all multicellular animals. Synonym: gastrea theory. (05 Mar 2000) |
| Haeckel's law | The theory formulated by E.H. Haeckel that individuals in their embryonic development pass through stages similar in general structural plan to the stages their species passed through in its evolution; more technically phrased, the theory that ontogeny is an abbreviated recapitulation of phylogeny. Synonym: biogenetic law, law of biogenesis, Haeckel's law, law of recapitulation. (05 Mar 2000) |
| Haeckel, Ernst | <person> German naturalist, 1834-1919. See: Haeckel's gastrea theory, Haeckel's law. (05 Mar 2000) |
| 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) |
| haem a | A derivative of haem found in cytochrome aa3. (05 Mar 2000) |
| haem A-farnesyltransferase | <enzyme> Required for synthesis of cytochrome oxidase and haem a synthesis; found in mitochondria of saccharomyces cerevisiae; has been sequenced Registry number: EC 2.5.1.- Synonym: cox10 gene product, cox10 protein (26 Jun 1999) |
| haem c | A derivative of haem found in cytochromes c, b4, and f. (05 Mar 2000) |
| haem oxygenase (decyclizing) | <enzyme> A mixed function oxidase enzyme which during haemoglobin catabolism catalyses the degradation of haem to ferrous iron, carbon monoxide and biliverdin in the presence of molecular oxygen and reduced NADPH. The enzyme is induced by metals, particularly cobalt. Chemical name: Haem,hydrogen-donor:oxygen oxidoreductase (alpha-methene-oxidizing, hydroxylating) Registry number: EC 1.14.99.3 (12 Dec 1998) |
| haem polymerase | <enzyme> Malarial enzyme forms haemozoin from haem derived from haemoglobin; no information on mechanism 2/92 Registry number: EC 2.- Synonym: haem polymerase (26 Jun 1999) |