| Udden-Wentworth scale | <plant biology> A geometric scale of grain sizes which classifies particles of siliciclastic sediment from 4096 millimetres (boulders) in size down to 0.00006 millimetres (clay). This scale is almost universally accepted by modern sedimentologists (a type of geologist). It was first proposed in 1898 by Udden and then modified and extended in 1922 by Wentworth. (09 Oct 1997) |
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| udder | 1. <anatomy> The glandular organ in which milk is secreted and stored; popularly called the bag in cows and other quadrupeds. See Mamma. "A lioness, with udders all drawn dry." (Shak) 2. One of the breasts of a woman. "Yon Juno of majestic size, With cowlike udders, and with oxlike eyes." (Pope) Origin: OE. Uddir, AS. Uder; akin to D. Uijer, G. Euter, OHG. Utar, utiro, Icel. Jugr, Sw. Jufver, jur, Dan. Yver, L. Uber, Gr. O"y^qar, Skr. Udhar. 216. Cf. Exuberant. Source: Websters Dictionary (01 Mar 1998) |
| udometer | <astronomy> A rain gauge. Origin: L. Udus wet, moist Source: Websters Dictionary (01 Mar 1998) |
| UDP | <abbreviation> Uridine 5'-diphosphate. (05 Mar 2000) |
| UDP acetylglucosamine-2-epimerase | <enzyme> Catalyses the formation of n-acetylmannosamine and udp from udp n-acetylglucosamine; minor descriptor (75-82); online and index medicus search carbohydrate isomerases (75-82); minor descriptor (75-82); file maintained to carbohydrate isomerases Registry number: EC 5.1.3.14 Synonym: udp acetylglucosamine 2 epimerase, udp n-acetyl-d-glucosamine 2-epimerase (26 Jun 1999) |
| UDP glucuronate pyrophosphatase | <enzyme> Udpga is converted to ump plus glucuronic acid-1-phosphate Registry number: EC 3.6.1.- Synonym: udp-glucuronic acid pyrophosphatase (26 Jun 1999) |
| UDP rhamnose-anthocyanidin-3-glucoside rhamnosyltransferase | <enzyme> Isolated from petunia hybrida; genbank z21795 Registry number: EC 2.4.1.- Synonym: 3rt transferase (26 Jun 1999) |
| UDP-3-O-(R-3-hydroxymyristoyl)-N-acetylglucosamine deacetylase | <enzyme> Permeability and cell division gene product that catalyses deacetylation in second enzymatic step of lipid a biosynthesis; isolated from e. Coli; do not confuse with enva protein from clamydia psittaci Registry number: EC 3.5.1.- Synonym: enva protein, e. Coli, lpxc protein, enva gene product, e. Coli, lpxc gene product (26 Jun 1999) |
| UDP-acetylglucosamine-beta-D-galactosylsaccharide acetylglucosaminyltransferase | <enzyme> Transfers 2-acetamido-2-deoxy-d-glucose from udp-2-acetamido-2-deoxy-d-glucose to terminal nonreducing beta-d-galactosyl residues in disaccharides, oligosaccharides, glycoproteins and glycolipids; detected in human serum Registry number: EC 2.4.1.- Synonym: udp-acetylglucosamine beta-d-galactosyl(1-4)saccharide (1-3)acetylglucosaminyltransferase, udp-agagt (26 Jun 1999) |
| UDP-beta(1-6)-D-galactosyltransferase | <enzyme> Catalyses transfer of d-galactose from udp-galactose to a (1-6) linkage on receptor h pomatia galactogen; beef lung galactogen, lymnaea stagnalis galactogen and arabinogalactan can also serve as receptors Registry number: EC 2.4.1.- Synonym: udp-d-galactosyltransferase beta (1-6), udp-galtransferase (1-6) (26 Jun 1999) |
| UDP-D-xylose-beta-D-glucoside alpha-1,3-xylosyltransferase | <enzyme> Catalyses transfer of xylose from udp-d-xylose to glucose Registry number: EC 2.4.2.- Synonym: udp-xyl-glc axt, beta-glucoside alpha-1,3-xylosyltransferase (26 Jun 1999) |
| UDP-D-xylose-xyloside alpha-1,3-xylosyltransferase | <enzyme> Catalyses transfer of xylose from udp-d-xylose to position 3 of xyl-1-3-glc-r' Registry number: EC 2.4.2.- Synonym: udp-xyl-xyl axt (26 Jun 1999) |
| UDP-Gal-beta-galactoside beta1-3-galactosyltransferase | <enzyme> From lymnaea stagnalis; involved in galactogen biosynthesis Registry number: EC 2.4.1.- Synonym: udpgal-3-galactosyltransferase (26 Jun 1999) |
| UDP-galactopyranose mutase | <enzyme> Interconverts udp-galactopyranose to udp-galactofuranose; contains a flavin cofactor identified as flavin adenine dinucleotide Registry number: EC 5.4.99.9 (26 Jun 1999) |
| UDP-galactose 4-O-beta-D-galactosyl-D-xylose galactosyltransferase | <enzyme> Involved in chondroitin sulfate synthesis Registry number: EC 2.4.1.- (26 Jun 1999) |