LACTOSE
\lˈaktə͡ʊz], \lˈaktəʊz], \l_ˈa_k_t_əʊ_z]\
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By William Dodge Lewis, Edgar Arthur Singer
By Willam Alexander Newman Dorland
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Syn.: milk sugar, galactosaccharum, saccharum lactis. C12H22O11+H2O, a compound carbohydrate (hexobiose) present in milk; also present at times in the urine of pregnant women. Upon hydrolysis with dilute acids or lactase one molecule of l. is converted into one molecule of d.-glucose and one molecule of d.-galactose. It responds to the ordinary reduction tests, which are characteristic of glucose, such as the Fehling test, Nylander's test, etc. But it will not ferment with yeast cells, a property which is made use of to distinguish it from glucose. With phenylhydrazin it forms a crystalline phenyl-lactosazone. [Lat.]
By Smith Ely Jelliffe
Word of the day
Dopamine Acetyltransferase
- An enzyme that catalyzes the of groups from acetyl-CoA to arylamines. They have wide specificity for aromatic amines, particularly serotonin, and can also catalyze acetyl transfer between arylamines without CoA. EC 2.3.1.5.