| azolitmin | A purplish red colouring matter obtained from natural litmus or synthesised by oxidizing orcinol in the presence of ammonia, lime, and potash; used as a broad indicator of pH (red at 4.5, blue at 8.3). (05 Mar 2000) |
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| azoospermia | <gynaecology, urology> The absence of spermatozoa in the semen or failure of formation of spermatozoa. (18 Nov 1997) |
| azophloxin | An azo dye, C18H13N3S2Na2, used in light and fluorescence microscopy as a real acid counterstain. Synonym: azophloxin. (05 Mar 2000) |
| azoprotein | Any of the modified proteins produced by treatment with diazonium derivatives of various aromatic amines; used to elicit antibody formation and demonstrate antibody specificity. (05 Mar 2000) |
| Azorean disease | A rare form of hereditary ataxia, characterised by onset in early adult life of progressive, spinocerebellar and extrapyramidal disease with external ophthalmoplegia, rigidity dystonia symptoms, and, often, peripheral amyotrophy; found predominantly in people of Azorean ancestry; autosomal dominant inheritance. Synonym: Azorean disease, Portuguese-Azorean disease. Origin: Surnames of two families studied in major descriptions of the disease. (05 Mar 2000) |
| azores | A group of nine islands and several islets belonging to portugal in the north atlantic ocean off the coast of portugal. The islands are named after the acores, the portuguese for goshawks, living there in abundance. (12 Dec 1998) |
| azospirillum | A genus of gram-negative bacteria that occurs free-living in the soil or associated with the roots of cereal crops or grasses. (12 Dec 1998) |
| azospirillum brasilense | Motile, free-living, gram-negative bacteria that occur in the soil. They are aerobic or microaerophilic and are sometimes capable of nitrogen fixation. (12 Dec 1998) |
| azosulfamide | 2-(4'-Sulfamylphenylazo)-7-acetamido-1-hydroxynaphthalene-3,6-disulfonate;a reddish derivative, soluble in water, less toxic but less effective than sulfanilamide; it owes its antibacterial activity to the sulfanilamide released. (05 Mar 2000) |
| azotaemia | A higher than normal blood level of urea or other nitrogen containing compounds in the blood. The hallmark test is the serum BUN (blood urea nitrogen) level. Usually caused by the inability of the kidney to excrete these compounds. (12 Dec 1998) |
| azotemia | 1. <biochemistry> An excess in the blood of urea, creatinine and other nitrogenous end products of protein and amino acids metabolism, more correctly referred to as azotaemia. 2. <nephrology> In current usage the entire constellation of signs and symptoms of chronic renal failure including nausea, vomiting anorexia, a metallic taste in the mouth, a uraemic odour of the breath, pruritus, uraemic frost on the skin, neuromuscular disorders, pain and twitching in the muscles, hypertension, oedema, mental confusion and acid base and electrolyte imbalances. Origin: Gr. Ouron = urine, haima = blood (18 Nov 1997) |
| azotemic | Relating to azotemia. (05 Mar 2000) |
| azotemic retinitis | An obsolete term for hypertensive retinopathy. See: hypertensive retinopathy. (05 Mar 2000) |
| azoth | <chemistry> The first principle of metals, i. E, mercury, which was formerly supposed to exist in all metals, and to be extractable from them. The universal remedy of Paracelsus. Origin: LL. Azoch, azoth, fr. Ar. Az-zauq mercury. Source: Websters Dictionary (01 Mar 1998) |
| azothermia | Rarely used term for fever resulting from uraemia. Origin: azote + G. Therme, heat (05 Mar 2000) |