| 释义 |
lactaseenUK
lac·tase L0010100 (lăk′tās′)n. An enzyme occurring in certain yeasts and in the intestinal juices of mammals and catalyzing the hydrolysis of lactose into glucose and galactose.lactase (ˈlækteɪs; -teɪz) n (Biochemistry) any of a group of enzymes that hydrolyse lactose to glucose and galactose[C20: from lacto- + -ase]lac•tase (ˈlæk teɪs, -ˌteɪz)
n. an enzyme capable of breaking down lactose into glucose and galactose. [1890–95] lac·tase (lăk′tās′) An enzyme that is found in the small intestine, liver, and kidneys of mammals and catalyzes the breakdown of lactose into simpler sugars, such as glucose.Thesaurus| Noun | 1. | lactase - any of a group of enzymes (trade name Lactaid) that hydrolyze lactose to glucose and galactoseLactaiddisaccharidase - an enzyme that catalyzes the hydrolysis of disaccharides into monosaccharides |
TranslationslactaseenUK
lactase[′lak‚tās] (biochemistry) An enzyme that catalyzes the hydrolysis of lactose to dextrose and galactose. lactaseenUK
lactase [lak´tās] β-d-galactosidase; an enzyme in the intestinal mucosa that hydrolyzes lactose, producing glucose and galactose.lactase deficiency a deficiency of intestinal lactase, which causes abdominal distention and cramping and often diarrhea when milk is drunk. The condition is usually hereditary with an onset between infancy and early adulthood, and is more common in Blacks, American Indians, and East Asians (70 to 90 per cent) than in Whites (10 to 15 per cent). It may also occur secondary to massive small bowel resection or to diseases involving the mucosa, such as celiac disease, Crohn's disease, tropical sprue, and ulcerative colitis.β-d-ga·lac·to·sid·ase (gă-lak'tō-sīd'ās), An enzyme that catalyzes the hydrolysis of lactose into d-glucose and d-galactose, as well as the hydrolysis of other β-d-galactosides; it also catalyzes galactotransferase reactions; a deficiency of β-d-galactosidase leads to problems in the intestinal digestion of lactose; used in the production of milk products for adults who lack the intestinal enzyme; a defect of one isozyme of β-d-galactosidase is associated with Morquio syndrome type B. Compare: lactase persistence, lactase restriction. Synonym(s): lactaselactase (lăk′tās′)n. An enzyme occurring in certain yeasts and in the intestinal juices of mammals and catalyzing the hydrolysis of lactose into glucose and galactose.GLB1 A gene on chromosome 3p21.33 that encodes beta-galactosidase-1, a lysosomal enzyme that hydrolyses the terminal beta-galactose from gangliosides and other glycoconjugates.
Molecular biology
GLB1 mutations cause GM1-gangliosidosis and mucopolysaccharidosis IV (Morquio B syndrome).β Abbreviation for beta.
be·ta (β) (bā'tă) 1. Second letter of the Greek alphabet. 2. chemistry Denotes the second in a series, the second carbon from a functional (e.g., carboxylic) group, or the direction of a chemical bond toward the viewer. For terms with the prefix β, see the specific term. lactase An enzyme that brings about the HYDROLYSIS of LACTOSE to glucose (dextrose) and galactose. Beta-galactosidase.lactase an enzyme that splits the disaccharide LACTOSE into galactose and glucose, secreted as part of the intestinal juice by glands in the SMALL INTESTINE wall. Lactase is also produced in ENZYME INDUCTION by bacteria (see OPERON MODEL).FinancialSeeBetalactaseenUK
Related to lactase: lactase deficiency, lactateSynonyms for lactasenoun any of a group of enzymes (trade name Lactaid) that hydrolyze lactose to glucose and galactoseSynonymsRelated Words |