| leucoryx | <zoology> A large antelope of North Africa (Oryx leucoryx), allied to the gemsbok. Origin: NL, from Gr. + a kind of gazelle. Source: Websters Dictionary (01 Mar 1998) |
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| leucoscope | <instrument, physics> An instrument, devised by Professor Helmholtz, for testing the colour perception of the eye, or for comparing different lights, as to their constituent colour or their relative whiteness. Origin: Leuco- + -scope. Source: Websters Dictionary (01 Mar 1998) |
| leucosis | The correct term for an excess of leucocytes in the circulation and other parts of the body, preferable in place of the term leucocytosis. (18 Nov 1997) |
| leucosoid | <zoology> Like or pertaining to the Leucosoidea, a tribe of marine crabs including the box crab or Calappa. Origin: NL. Leucosia, the typical genus (fr. Gr. White). Source: Websters Dictionary (01 Mar 1998) |
| leucosphere | <astronomy> The inner corona. Origin: Leuco- + sphere. Source: Websters Dictionary (01 Mar 1998) |
| leucotriene | <biochemistry> A family of hydroxyeicosotrienenoic (HETE) acid derivatives in which the lipid moiety is conjugated to glutathione or cysteine. Members of the group are potent pharmacological mediators, for example SRS A, the slow reacting substance of anaphylaxis. (18 Nov 1997) |
| leucoturic | <chemistry> Pertaining to, or designating, a nitrogenous organic substance of the uric acid group, called leucoturic acid or oxalantin. See Oxalantin. Origin: Leuco- + allantoic + uric. Source: Websters Dictionary (01 Mar 1998) |
| leucous | White; applied to albinos, from the whiteness of their skin and hair. Origin: Gr. Source: Websters Dictionary (01 Mar 1998) |
| leucovorin | <chemical> The active metabolite of folic acid. Leucovorin is used principally as its calcium salt as an antidote to folic acid antagonists which block the conversion of folic acid to folinic acid. Pharmacological action: antidotes. Chemical name: L-Glutamic acid, N-(4-(((2-amino-5-formyl-1,4,5,6,7,8-hexahydro-4-oxo-6-pteridinyl)methyl)amino)benzoyl)- (12 Dec 1998) |
| leucovorin calcium | <drug> The calcium salt of leucovorin (folinic acid); used to counteract toxic effects of folic acid antagonists, for the treatment of megaloblastic anaemias, and as an adjunct to cyanocobalamin in pernicious anaemia. Synonym: calcium folinate. (05 Mar 2000) |
| leucoxene | <chemical> A nearly opaque white mineral, in part identical with titanite, observed in some igneous rocks as the result of the alteration of titanic iron. Origin: Leuco- + Gr. Xenos stranger. Source: Websters Dictionary (01 Mar 1998) |
| leucyl-beta-naphthylamidase | <enzyme> Frequently used to test for leucine aminopeptidase (ec 3.4.11.1) activity; hydrolyzes naphthylamides of leucine. Registry number: EC 3.4.11.- (12 Dec 1998) |
| leucyltransferase | <enzyme> A component of the bacterial n-end rule pathway; aa has been determined Registry number: EC 2.3.2.6 Synonym: leucyl-trna protein leucyltransferase, leucyl-, phenylalanyl-trna-protein transferase (26 Jun 1999) |
| leucine z. |
a stretch of amino acids consisting of four to seven leucine residues, each separated by six amino acids, occurring adjacent to a highly basic stretch of amino acids in some DNA-binding proteins. The configuration of the region is a helix, arranged such that leucine residues from two separate helices can interdigitate or interact to form dimers; the basic regions are arranged so as to recognize and bind specific DNA sequences.
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| leucine-induced h. |
a familial type of neonatal hypoglycemia transmitted as an autosomal recessive trait; hypoglycemia is induced by ingestion of leucine-containing protein, which causes an exaggerated release of insulin in susceptible persons.
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| leucinimide |
the anhydride of leucine, a diketopiperazine; it may be produced by evaporation of leucine solutions.
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| leucinosis |
leucinuria.
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| leucinuria |
excretion of leucine in the urine, as in some forms of maple syrup urine disease, tyrosinemia, and other conditions. See also hyperleucinemia.
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