单词	lactase
释义	lactase noun lac·​tase ˈlak-ˌtās  -ˌtāz : an enzyme that hydrolyzes beta-galactosides (such as lactose) and occurs especially in the intestines of young mammals and in yeasts Example Sentences Recent Examples on the Web The study also can’t account for the separate development of lactase-persistence alleles in other areas of the world, most notably in Africa, another continent where early evidence of milk consumption has been found. Haley Weiss, The Atlantic, 27 July 2022 What’s more, studies of ancient human DNA have shown that the genetic mutation that enabled European lactase persistence doesn’t look like something that conferred a marginal nutritional advantage. Brian Handwerk, Smithsonian Magazine, 27 July 2022 Celiac disease and small intestinal bacterial overgrowth are malabsorption syndromes that can sometimes mimic pure lactase deficiency. Dr. Keith Roach, oregonlive, 19 May 2022 In drinking a full gallon of milk, most people burn through their available lactase and then become lactose intolerant during the challenge.... Peter Weber, The Week, 1 Oct. 2018 This happens if the small intestine doesn't make enough lactase, the enzyme that helps with dairy digestion by breaking down lactose. Melissa Matthews, SELF, 5 Jan. 2021 The firm won an Accelerator grant to develop a subcutaneous sensor to simultaneously monitor glucose, ketones, and lactase in diabetic patients. Nicholas Wallace, Science | AAAS, 8 Apr. 2020 These individuals lack the enzyme lactase (to varying degrees) that allows them to break down lactose, the sugar in milk. Sara Chodosh, Popular Science, 7 Jan. 2019 Lola’s genome also contained alleles that are usually associated with the inability to produce lactase—an enzyme that’s important in digesting milk—as an adult. Kiona N. Smith, Ars Technica, 13 Feb. 2020 See More Word History Etymology International Scientific Vocabulary First Known Use 1891, in the meaning defined above Medical Definition lactase noun lac·​tase ˈlak-ˌtās, -ˌtāz  : an enzyme that hydrolyzes especially lactose to glucose and galactose and occurs especially in the intestines of young mammals and in yeasts
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