| lactose repressor | Protein (tetramer of 37 kD subunits) that normally binds with very high affinity to the operator region of the lactose operon and inhibits transcription of the downstream genes by blocking access of the polymerase to the promoter region. When the lactose repressor binds allolactose, its binding to the operator is reduced and the gene set is derepressed. (18 Nov 1997) |
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| lactose synthase | <enzyme> An enzyme of the transferase class that catalyses the transfer of galactose from udpgalactose to glucose, forming lactose. The enzyme is a complex of the enzyme n-acetyllactosamine synthase and alpha-lactalbumin; the latter protein is present in lactating mammary gland cells where it alters the usual specificity of the former to make lactose synthesis the preferred reaction. Chemical name: UDPgalactose:D-glucose 4-beta-D-galactosyltransferase Registry number: EC 2.4.1.22 (12 Dec 1998) |
| lactose-litmus agar | Agar made by adding 2% lactose and litmus to acid-free nutrient agar; formerly used in the identification of Salmonella typhi. (05 Mar 2000) |
| lactosuria | Excretion of lactose (milk sugar) in the urine; a common finding during pregnancy and lactation, and in the newborn, especially premature babies. Origin: Lactose + G. Ouron, urine, + -ia (05 Mar 2000) |
| lactosylceramidase | <enzyme> Ceramide-glc-gal and h2o gives cer-glc and galactose; deficiency gives lactosylceramidosis; see also lactosylceramidase II which acts gm(1) ganglioside Registry number: EC 3.2.1.- Synonym: lactosylceramide galactosyl hydrolase, lactosylceramidase i (26 Jun 1999) |
| lactosylceramides | Glycosphingolipids which contain as their polar head group a lactose moiety bound in glycosidic linkage to the hydroxyl group of ceramide. Their accumulation in tissue, due to a defect in lactosylceramide beta-galactosidase, is the cause of lactosylceramidosis. (12 Dec 1998) |
| lactotherapy | Treatment of disease by means of an exclusive or nearly exclusive milk diet. Synonym: lactotherapy. (05 Mar 2000) |
| lactotropin | <protein> Pituitary lactogenic hormone (23 kD) Synthesised on endoplasmic reticulum bound ribosomes as preprolactin that has an N terminal signal peptide that is cleaved from the mature form. The conversion of preprolactin to prolactin has been much used as an assay for membrane insertion. (18 Nov 1997) |
| lactovegetarian | One who lives on a mixed diet of milk and milk products, eggs, and vegetables, but eschews meat. (05 Mar 2000) |
| lactoylglutathione lyase | <enzyme> An enzyme that catalyses the interconversion of methylglyoxal and lactate, with glutathione serving as a coenzyme. Chemical name: S-Lactoyl-glutathione methylglyoxal-lyase (isomerizing) Registry number: EC 4.4.1.5 (12 Dec 1998) |
| lactuca | <botany> A genus of composite herbs, several of which are cultivated foe salad; lettuce. Origin: L, lettuce. See Lettuce. Source: Websters Dictionary (01 Mar 1998) |
| lactucic | <chemistry> Pertaining to, or derived from, the juice of the Lactuca virosa; said of certain acids. Source: Websters Dictionary (01 Mar 1998) |
| lactucin | <chemistry> A white, crystalline substance, having a bitter taste and a neutral reaction, and forming one of the essential ingredients of lactucarium. Origin: From Lactuca: cf. F. Lactucine. Source: Websters Dictionary (01 Mar 1998) |
| lactucone | <chemistry> A white, crystalline, tasteless substance, found in the milky sap of species of Lactuca, and constituting an essential ingredient of lactucarium. Origin: From Lactuca. Source: Websters Dictionary (01 Mar 1998) |
| lactulose | <chemical> A synthetic disaccharide used in the treatment of constipation and hepatic encephalopathy. It has also been used in the diagnosis of gastrointestinal disorders. Pharmacological action: cathartic, gastrointestinal agents. Chemical name: D-Fructose, 4-O-beta-D-galactopyranosyl- (12 Dec 1998) |
| lacerated |
ragged; torn.
출처: www.biology.lsu.edu/heydrjay/ThomasSay/terms.html
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| lactescent |
yielding or secreting a milky fluid.
출처: www.biology.lsu.edu/heydrjay/ThomasSay/terms.html
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| lactose intolerance |
A condition in which a person's small intestine doesn't produce enough lactase, an enzyme that digests a sugar found naturally in milk and other dairy products (lactose). Signs and symptoms of lactose intolerance include nausea, abdominal cramps, bloating, gas and diarrhea.
출처: www.cnn.com/HEALTH/library/DG/00022.html
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| lacuna |
small pit or cavity.
출처: embryology.med.unsw.edu.au/Notes/Index/L.htm
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| lactation |
(Latin lactans = suckling) production of milk through action of prolactin and other hormones on breast tissue.
출처: embryology.med.unsw.edu.au/Notes/Index/L.htm
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