| fructuronate reductase | <enzyme> An enzyme that catalyses the reversible oxidation of mannonate to fructuronate in the presence of NAD. Also reduces d-tagaturonate to d-altronate. Chemical name: D-Mannonate:NAD+ 5-oxidoreductase Registry number: EC 1.1.1.57 (12 Dec 1998) |
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| fumarate reductase | <enzyme> Registry number: EC 1.3.99.1 (12 Dec 1998) |
| leukotriene B4 reductase | <enzyme> Converts leukotriene b4 (5s,12r-dihydroxyeicosoletra-6,8,10,14-enoic acid) to dihydro ltb4 (5s,12r-10,11-dihydroeicosatri-6,8,14-enoic acid), requires NADPH, ca and mg Registry number: EC 1.3.1.- (26 Jun 1999) |
| leupeptin acid reductase | <enzyme> Converts leupeptin acid (acetyl-l-leu-l-leu-l-arg) into leupeptin (acetyl-l-leu-l-leu-l-arginal); requires ATP and NADPH Registry number: EC 1.2.1.- (26 Jun 1999) |
| lipoamide reductase | <enzyme> An enzyme oxidizing dihydrolipoamide at the expense of NAD+; completes the oxidative decarboxylation of pyruvate; a part of several enzyme complexes (e.g., alpha-ketoglutarate dehydrogenase complex). Decreased activity leads to neuronal loss in brain resulting in psychomotor retardation. Synonym: coenzyme factor, lipoamide dehydrogenase, lipoamide reductase (NADH), lipoyl dehydrogenase. (05 Mar 2000) |
| L-ribose reductase | <enzyme> Nadph-linked E coli enzyme converts l-ribose to ribitol Registry number: EC 1.1.1.- (26 Jun 1999) |
| L-sorbose-1-phosphate reductase | <enzyme> Converts l-sorbose 1-phosphate to d-glucitol 6-phosphate in the presence of NADPH; also converts d-fructose 1-phosphate to d-mannitol 6-phosphate Registry number: EC 1.1.1.- Synonym: sor e gene product, sor 1-p reductase, sorbose-1-p reductase (26 Jun 1999) |
| L-xylulose reductase | <enzyme> Chemical name: xylitol nadp 4-oxidoreductase (l-xylulose-forming) Registry number: EC 1.1.1.10 (26 Jun 1999) |
| Abbe test plate | <equipment> A long, wedge-shaped coverslip about 0.20 mm thick at one end and 0.10 to 0.12 mm at the other end coated chemically with a silver film on which are ruled horizontal lines. at each variation in thickness of 0.01 mm there are vertical lines. By means of oblique illumination and by focusing on different portions of the plate, it is possible to determine the optimum coverslip thickness for any objective and also, for microscopes with drawtubes, the tube length for best objective performance. The approximate freedom from spherical and chromatic aberrations can also be estimated. Small isolated bits of silver near the edges of the lines form good objects for the star test (05 Aug 1998) |
| acetone test | A test for ketonuria; the suspected urine is shaken up with a few drops of sodium nitroprusside, and strong ammonia water is then gently poured over the mixture; if acetone is present, a magenta ring forms at the line of contact; tablets containing sodium nitroprusside and alkali are now more commonly used. (05 Mar 2000) |
| achievement test | A standardised test used to measure acquired learning, e.g., competence in a specific subject area such as reading or arithmetic, in contrast to an intelligence test which is a useful index of potential ability or learning. (05 Mar 2000) |
| acidified serum test | Lysis of the patient's red cells in acidified fresh serum, specific for paroxysmal nocturnal haemoglobinuria. Synonym: Ham's test. (05 Mar 2000) |
| acid loading test | <nephrology> This is a test used in the diagnosis of renal tubular acidosis. The patient takes ammonium chloride capsules for 3 days to acidify the blood (lower blood pH). A sample of the urine and the blood is then collected and the results are interpreted. (27 Sep 1997) |
| acid perfusion test | <gastroenterology, investigation> A test used to diagnosis gastrooesophageal reflux disease. This investigation requires that the patient swallow 3 tiny tubes into the stomach. A mixture of hydrochloric acid (like stomach acid) and saline are alternatively injected into the tubes. The patient then reports any symptoms they may have. Some patients may vomit. (13 Nov 1997) |
| acid phosphatase test for semen | A screening test for semen by determining acid phosphatase content; because seminal fluid contains high concentrations of acid phosphatase, while other body fluids and extraneous foreign materials have very low concentrations, high values of acid phosphatase on vaginal aspirate or lavage, or on wash fluid from stains, render positive identification of semen, even if the male is aspermic. (05 Mar 2000) |