/lak"tays, -tayz'/, n. Biochem.
an enzyme capable of hydrolyzing lactose into glucose and galactose.
[1890-95; LACT- + -ASE]

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      any of a group of enzymes found in the small intestine, liver, and kidney of mammals that catalyze the breakdown of lactose (milk sugar) into the simple sugars glucose and galactose. Lactase is particularly abundant during infancy. The enzyme is thought to be produced by the mucous membrane cells that line the intestinal walls; granules localize in the brush border (a chemical barrier through which food must pass to be absorbed) that coats the intestinal villi.

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Universalium. 2010.

Look at other dictionaries:

  • Lactase — Masse/Länge Primärstruktur 1927 Aminosäuren; 219 kDa …   Deutsch Wikipedia

  • lactase — [ laktaz ] n. f. • v. 1900; de lact(o) et ase ♦ Biochim. Enzyme qui transforme le lactose en glucose et galactose. ⇒ galactosidase. ● lactase nom féminin Enzyme sécrétée par la muqueuse intestinale, permettant l assimilation du lactose. lactase n …   Encyclopédie Universelle

  • lactase — |lâct| s. f. Diástase que converte a lactose em glicose e galactose …   Dicionário da Língua Portuguesa

  • lactase — [lak′tās΄] n. [ LACT(O) + (DIAST)ASE] an enzyme, present in certain yeasts and in the intestines of animals, which splits lactose into glucose and galactose …   English World dictionary

  • Lactase — La lactase () est une enzyme présente essentiellement chez les mammifères. Sa fonction principale est de permettre la dissociation du lactose, ce qui autorise la digestion du lait. La lactase a pour nom scientifique complet lactase phlorizine… …   Wikipédia en Français

  • Lactase — Protein Name=Lactase Symbol=LCT AltSymbols=LAC; LPH; LPH1 HGNCid=6530 Chromosome=2 Arm=q Band=21 LocusSupplementaryData= ECnumber= OMIM=603202 EntrezGene=3938 RefSeq=NM 002299 UniProt=P09848 Lactase (LCT), a part of the β galactosidase… …   Wikipedia

  • Lactase — Enzyme that breaks down the milk sugar lactose into glucose and galactose. Persons with a deficiency of lactase in the gut can develop abdominal cramping and diarrhea after ingesting milk products. * * * SYN: β d galactosidase. * * * lac·tase lak …   Medical dictionary

  • lactase — laktazė statusas T sritis chemija apibrėžtis Fermentas, skaidantis laktozę. atitikmenys: angl. lactase rus. лактаза …   Chemijos terminų aiškinamasis žodynas

  • lactase — noun Etymology: International Scientific Vocabulary Date: 1891 an enzyme that hydrolyzes beta galactosides (as lactose) and occurs especially in the intestines of young mammals and in yeasts …   New Collegiate Dictionary

  • lactase — noun A β galactosidase enzyme that is involved in the hydrolysis of the disaccharide lactose into constituent galactose and glucose monomers …   Wiktionary

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