U
Undecylenic Acid
Posted on July 24, 2011 |
Salts and derivatives of undecylenic acid.
Unsaturated Fatty Acids
Posted on July 24, 2011 |
FATTY ACIDS in which the carbon chain contains one or more double or triple carbon-carbon bonds.
UDP Acetylgalactosamine
Posted on July 24, 2011 |
A nucleoside diphosphate sugar which serves as a source of N-acetylgalactosamine for glycoproteins, sulfatides and cerebrosides.
UDP Acetylglucosamine
Posted on July 24, 2011 |
Serves as the biological precursor of insect chitin, of muramic acid in bacterial cell walls, and of sialic acids in mammalian glycoproteins.
UDP Glucuronic Acid
Posted on July 24, 2011 |
A nucleoside diphosphate sugar which serves as a source of glucuronic acid for polysaccharide biosynthesis. It may also be epimerized to UDP iduronic acid, which donates iduronic acid to polysaccharides. In animals, UDP glucuronic acid is used for formation of many glucosiduronides with various aglycones.
Uncoupling Agents
Posted on July 24, 2011 |
Chemical agents that uncouple oxidation from phosphorylation in the metabolic cycle so that ATP synthesis does not occur. Included here are those IONOPHORES that disrupt electron transfer by short-circuiting the proton gradient across mitochondrial membranes.
Urea Amidohydrolase
Posted on July 24, 2011 |
An enzyme that catalyzes the conversion of urea and water to carbon dioxide and ammonia. EC 3.5.1.5.
Uricosuric Agents
Posted on July 24, 2011 |
Gout suppressants that act directly on the renal tubule to increase the excretion of uric acid, thus reducing its concentrations in plasma.
Ursodeoxycholic Acid
Posted on July 24, 2011 |
An epimer of chenodeoxycholic acid. It is a mammalian bile acid found first in the bear and is apparently either a precursor or a product of chenodeoxycholate. Its administration changes the composition of bile and may dissolve gallstones. It is used as a cholagogue and choleretic.
Urogranoic Acid
Posted on July 24, 2011 |
A commonly used x-ray contrast medium. As DIATRIZOATE MEGLUMINE and as Diatrizoate sodium, it is used for gastrointestinal studies, angiography, and urography.