| 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) |
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| 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) |
| 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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| xylene poisoning |
SEE: poisoning.
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| xyl(o)- |
a combining form denoting relationship to wood.
출처: www.mercksource.com/pp/us/cns/cns_health_library.j...
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| xylan |
any of a group of pentosans composed of xylose residues; they are major structural constituents of wood, straw, and bran.
출처: www.mercksource.com/pp/us/cns/cns_health_library.j...
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| xylazine hydrochloride |
[USP] a veterinary analgesic, sedative, and muscle relaxant, used in most domestic animals except pigs.
출처: www.mercksource.com/pp/us/cns/cns_health_library.j...
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