UDP

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UDP

(uridine diphosphate): see uraciluracil
, organic base of the pyrimidine family. It was isolated from herring sperm and also produced in a laboratory in 1900–1901. When combined with the sugar ribose in a glycosidic linkage, uracil forms a derivative called uridine (a nucleoside), which in turn can be
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.
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UDP

(biochemistry)
(communications)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

UDP

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UDP

(User Datagram Protocol) A TCP/IP protocol that is widely used for streaming audio and video, voice over IP (VoIP) and videoconferencing. UDP is considered an unreliable delivery protocol because it does not check for errors. When transmitting voice and video, there is no time to retransmit erroneous or dropped packets. In contrast, when financial and other data are transmitted, TCP is used, which does check for errors.

UDP is "connectionless" and does not use a handshake to start a session like TCP does. For example, in a broadcast session with multiple destinations, UDP does not set up a connection with each receiver beforehand. See TCP, TCP/IP and RTP.


UDP Within an Ethernet Frame
A UDP packet is framed just like a TCP packet. This shows a UDP packet in an Ethernet frame ready for transmission over the network.







The Transport Layer of TCP/IP
The transport layer of the TCP/IP protocol defines both unreliable (UDP) and reliable (TCP) delivery methods.
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References in periodicals archive ?
Then, gal-1-P reacts with UDP-glucose to produce UDP-galactose and glucose-1-phosphate (glu-1-P) via the action of gal-1 -P uridylyltransferase (GALT).
In plants, the most common substrate for transferring reaction is UDP-glucose (Lim et al., 2004).Typical donors of plant GTs are UDP-glucose (UDP-Glc), UDP-rhamnose (UDP-Rha), UDP-galactose (UDP-Gal), UDP-xylose (UDP-Xyl) and UDP-glucuronic acid (UDP-GlcUA).
UDP-GlcNAc controls UDP-N-acetylgalactosamine availability by the action of the UDP-galactose 4-epimerase enzyme [69].
We did not test transformed protoplast membrane preparations in the presence of both radioactive GDP-mannose and GDP-glucose and/or UDP-galactose; therefore we cannot exclude that AtCslA2 gene may have a role in the synthesis of (galacto)mannans or (galacto)glucomannans.
The new molecules, known as synthetic UDP-galactose derivatives, are shaped in such a way that they block these enzymes and stop the sugar structures forming.
The new molecules are synthetic derivatives of a natural product known as UDP-Galactose, and block the activity of a group of enzymes called glycosyltransferases.
The molecules, called "synthetic UDP-galactose derivatives" and indentified by a group of UK scientists, may also stop infectious bacteria spreading.
The new molecules, UDP-galactose derivatives, are shaped in such a way that they block these enzymes and stop the sugar structures forming.
Van Elk and Joosse (1981) recorded the influence of the photoperiod, the starvation and the infection with larval trematodes on the catalytic activity of the enzyme UDP-galactose 4-epimerase in the albumen gland of Lymnaea stagnalis Linnaeus, 1758.
Soybean galactinol synthase (GmGolS, UDP-galactose:myo-inositol galactosyltransferase, EC 2.4.1.123) forms galactinol ([alpha]-D-galactopyranosyl-(1 [right arrow] 1)-1L-myo-inositol) (Saravitz et al., 1987; Kerr et al., 1997; Obendorf et al., 2004) and catalyzes a galactosyl transfer from UDP-galactose to D-chiro-inositol for the synthesis of fagopyritol B1, but GmGolS does not catalyze the galactosyl transfer from UDP-galactose to D-pinitol to form galactopinitols (Obendorf et al., 2004).
The third enzyme is UDP-galactose 4-epimerase (GALE), which converts UDP-galactose to UDP-glucose, which subsequently is converted to glucose or glycogen as a source of energy.