| xylose isomerase | <enzyme> Note that xyla has been used to refer to both xylose isomerase and xylanase a Registry number: EC 5.3.1.5 Synonym: glucose isomerase, d-acidic-ketolysoisomerase (26 Jun 1999) |
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| xylose test | A laboratory aid in diagnosing alimentary or essential pentosuria, conditions in which xylose (a pentose) is excreted; the xylose may be identified by rapid reduction of Benedict's solution, by nonfermentation by yeasts, or by a positive Bial's test for pentose. (05 Mar 2000) |
| xylose tolerance test | <investigation> This test measures the intestine's ability to absorb the simple sugar, D-xylose. This is an indicator for whether or not nutrients are being absorbed properly in the intestine. This test is often used to evaluate persistent diarrhoea, weight loss, malnutrition and cases of suspected malabsorption. Abnormal results may be seen in the following conditions: Crohn's disease, Giardiasis, hookworm infestation, radiation enteritis, celiac sprue, viral gastroenteritis and Whipple's disease. (27 Sep 1997) |
| xylosidases | <enzyme> A group of enzymes that catalyze the hydrolysis of alpha- or beta-xylosidic linkages. Catalyses the endo-hydrolysis of 1,4-beta-d-xylosidic linkages; EC 3.2.1.32 catalyses the endo-hydrolysis of 1,3-beta-d-xylosidic linkages; EC 3.2.1.37 catalyses the exo-hydrolysis of 1,4-beta-d-linkages from the non-reducing termini of xylans; and EC 3.2.1.72 catalyses the exo-hydrolysis of 1,3-beta-d-linkages from the non-reducing termini of xylans. Other xylosidases have been identified that catalyze the hydrolysis of alpha-xylosidic bonds. Registry number: EC 3.2.1.- (12 Dec 1998) |
| xylostein | <chemistry> A glucoside found in the poisonous berries of a species of honeysuckle (Lonicera xylosteum), and extracted as a bitter, white, crystalline substance. Origin: Xylo- + Gr. Bone. Source: Websters Dictionary (01 Mar 1998) |
| xylostyptic ether | Tannic acid in flexible collodion; an astringent and local haemostatic. Synonym: haemostatic collodion, styptic colloid, xylostyptic ether. (05 Mar 2000) |
| xylosylprotein 4-beta-galactosyltransferase | <enzyme> Catalyses the second glycosyl transfer reaction in the assembly of the dermatan sulfate chain Registry number: EC 2.4.1.133 Synonym: galactosyltransferase i (26 Jun 1999) |
| xylotrya | <zoology> A genus of marine bivalves closely allied to Teredo, and equally destructive to timber. One species (Xylotrya fimbriata) is very common on the Atlantic coast of the United States. Origin: NL, fr. Gr. Xylon wood + to rub, wear out. Source: Websters Dictionary (01 Mar 1998) |
| xylulose | <biochemistry> A 5 carbon ketose sugar, whose 5 phosphate is an intermediate in the pentose phosphate pathway and the Calvin cycle. (18 Nov 1997) |
| xylulose reductase | <enzyme> An enzyme that reversibly converts xylulose to xylitol using either NADH (d-xylulose reductase) or NADPH (l-xylulose reductase); a deficiency of the l-form is seen in individuals with essential pentosuria. Synonym: xylitol dehydrogenase. (05 Mar 2000) |
| xylyl | <chemistry> Any one of three metameric radicals which are characteristic respectively of the three xylenes. Origin: Xylo- + -yl. Source: Websters Dictionary (01 Mar 1998) |
| xylylene | <chemistry> Any one of three metameric radicals, CH2.C6H4.CH2, derived respectively from the three xylenes. Often used adjectively; as, xylylene alcohol. Source: Websters Dictionary (01 Mar 1998) |
| xyridaceous | <botany> Of or pertaining to a natural order (Xyrideae) of endogenous plants, of which Xyris is the type. Source: Websters Dictionary (01 Mar 1998) |
| xyris | <botany> A genus of endogenous herbs with grassy leaves and small yellow flowers in short, scaly-bracted spikes; yellow-eyed grass. There are about seventeen species in the Atlantic United States. Origin: L, a kind of Iris, Gr, fr. A razor. Source: Websters Dictionary (01 Mar 1998) |
| xyrospasm | Synonym: shaving cramp. Origin: G. Xyron, razor, fr. Xyo, to scrape (05 Mar 2000) |
| xylol |
A solvent for synthetic resins and gums, distilled from coal tar.
출처: www.dreamghar.com/xyzdic.html
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| xylene |
Dimethylbenzene. An aromatic compound having the formula C6H4(CH3)2. Xylene is a major component of gasoline. A mixture of toluene and xylene is frequently used as an automotive paint thinner. Xylene is actually a mixture of three isomers, ortho, meta and para xylene, which have the methyl groups in different positions relative to each other on the benzene ring. The flash points of these isomers range from 81?to 115
출처: www.fire.org.uk/glossary.htm
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| xylitol |
a sweetener found in plants and used as a substitute for sugar
출처: www.diabetes.org.au/glossary.htm
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| xylene |
Any of three isomeric hydrocarbons that are flammable volatile colorless liquids obtained from crude oil or natural gas. They are aromatic hydrocarbons commonly used as industrial solvents and in producing aviation fuel, resins, and dyes.
출처: www.berg.com.sg/mgXYZ.htm
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| xylitol |
a low-calorie sugar substitute used in certain chewing gums and other food products
출처: www.mchoralhealth.org/OpenWide/glossary.htm
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