| oxalethyline | A poisonous nitrogenous base (C6H10N2) obtained indirectly from oxamide as a thick transparent oil which has a strong narcotic odour, and a physiological action resembling that of atropine. It is probably related to pyridine. Origin: Oxalic + ethyl + -ine. Source: Websters Dictionary (01 Mar 1998) |
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| oxalic | <chemistry> Pertaining to, derived from, or contained in, sorrel, or oxalis; specifically, designating an acid found in, and characteristic of, oxalis, and also certain plant of the Buckwheat family. <chemistry> Oxalic acid, a dibasic acid, existing combined in oxalis as an acid potassium oxalate, and in many plant tissues as the calcium oxalate. It is prepared on a large scale, by the action of fused caustic soda or potash on sawdust, as a white crystalline substance, which has a strong acid taste, and is poisonous in large doses. It is used in dyeing, calico printing, bleaching flax and straw, the preparation of formic acid, and in salts of lemon for removing ink stains, mold, etc. Origin: From Oxalis: cf. F. Oxalique. Source: Websters Dictionary (01 Mar 1998) |
| oxalic acid | Occurs in plants and is toxic to higher animals by virtue of its calcium binding properties, it causes the precipitation of calcium oxalate in the kidneys, prevents calcium uptake in the gut and is not metabolised. (18 Nov 1997) |
| oxaline | <chemistry> See Glyoxaline. Origin: Glyoxal + -ine. Source: Websters Dictionary (01 Mar 1998) |
| oxalis | <botany> A genus of plants,mostly herbs, with acid-tasting trifoliolate or multifoliolate leaves. Synonym: wood sorrel. Origin: L, a kind of sorrel, Gr, fr. Sharp,pungent, acid. Source: Websters Dictionary (01 Mar 1998) |
| oxalite | <chemical> A yellow mineral consisting of oxalate of iron. Source: Websters Dictionary (01 Mar 1998) |
| oxalo | The monoacyl radical, HOOC-C(O)-. (05 Mar 2000) |
| oxaloacetate | <biochemistry> Metabolic intermediate. Couples with acetyl CoA to form citrate, i.e. The entry point of the tricarboxylic acid cycle. Formed from aspartic acid by transamination. (18 Nov 1997) |
| oxaloacetate tautomerase | <enzyme> From fuma gene of E coli; catalyses the isomerization of enol to keto oxalacetic acid Registry number: EC 5.3.2.2 Synonym: oxaloacetate keto-enol tautomerase, fumarase a, oxalacetic acid keto-enol isomerase, oaake isomerase (26 Jun 1999) |
| oxaloacetate transacetase | Citrate (si)-synthase;an enzyme catalyzing the condensation of oxaloacetate, water, and acetyl-CoA, forming citrate and coenzyme A; an important step in the tricarboxylic acid cycle. Synonym: citrogenase, condensing enzyme, oxaloacetate transacetase. (05 Mar 2000) |
| oxaloacetic acid | HOOC-CO-CH2COOH;a ketodicarboxylic acid and important intermediate in the tricarboxylic acid cycle; the product formed when l-aspartic acid acts as an amine donor in transamination reactions. Synonym: ketosuccinic acid, oxosuccinic acid. (05 Mar 2000) |
| oxalosis | A genetic disease of autosomal recessive inheritance that results in the deposition of calcium oxalate in the genitourinary system and kidneys (nephrocalcinosis). Usually evident in the first decade of life, progressive renal failure is not uncommon. Inheritance: autosomal recessive. (27 Sep 1997) |
| oxalosuccinic acid | HOOC-CO-CH(COOH)-CH2-CO OH;the product of the dehydrogenation of isocitric acid under the catalytic influence of isocitrate dehydrogenase; an enzyme-bound intermediate of the tricarboxylic acid cycle. (05 Mar 2000) |
| oxalosuccinic carboxylase | <enzyme> An enzyme of the oxidoreductase class that catalyses the conversion of isocitrate and NAD+ to yield 2-ketoglutarate, carbon dioxide, and NADH. It occurs in cell mitochondria. The enzyme requires magnesium, mn2+; it is activated by ADP, citrate, and calcium, and inhibited by NADH, NADPH, and ATP. The reaction is the key rate-limiting step of the citric acid (tricarboxylic) cycle. (the NADP+ enzyme is EC 1.1.1.42.) Chemical name: Isocitrate:NAD+ oxidoreductase (decarboxylating) Registry number: EC 1.1.1.41 (12 Dec 1998) |
| oxalourea | The cyclic (end-to-end) amide anhydride of oxaluric acid; an oxidation product of uric acid. Synonym: oxalourea, parabanic acid. (05 Mar 2000) |