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
Proto Oncogene Proteins c erbB 2
- cell surface protein-tyrosine kinase that is found to be overexpressed in significant number adenocarcinomas. It has extensive homology can heterodimerize EGF EPIDERMAL GROWTH FACTOR), 3 receptor (RECEPTOR, 3) and the 4 receptor. Activation of erbB-2 receptor occurs during heterodimer formation with a ligand-bound erbB family members. EC 2.7.11.-.