نتایج جستجو برای: پروتکلtcpو پروتکل udp

تعداد نتایج: 12221  

2007
Benjamin W. Wah

Subband-coded images can be transmitted in the Internet using either the TCP or the UDP protocol. Delivery by TCP gives superior decoding quality but with very long delays when the network is unreliable, whereas delivery by UDP has negligible delays but with degraded quality when packets are lost. Although images are delivered currently over the Internet by TCP, we study in this paper the use o...

Journal: :Cancer research 1990
K W Bock P A Münzel E Röhrdanz D Schrenk L C Eriksson

Increased UDP-glucuronosyltransferase in rat hepatocyte nodules and hepatocellular carcinomas produced by feeding 2-acetylaminofluorene or N-nitrosomorpholine was studied using isozyme-selective substrates, antibodies, and DNA probes. UDP-glucuronosyltransferase (UDP-GT) activities toward 4-methylumbelliferone, 1-naphthol, and benzo[a]pyrene-3,6-quinol were reversibly increased by short term fe...

Journal: :Acta medica Okayama 1997
Y Mikami M Mizuno T Maga Y Kihara F Yoshinaga S Tanaka N Yunoki T Kawahara H Okada T Tsuji

UDP-galactosyltransferase (UDP-Gal-T) is a key enzyme in the synthesis of mucus glycoprotein which plays an important role in gastric mucosal defensive mechanisms. Analysis of gastric UDP-Gal-T activity should clarify the mechanisms of the action of antiulcer drugs regarding gastric defensive factors. Here, we examined UDP-Gal-T activity in rat gastric mucosa treated with the antiulcer drugs ge...

2004
Inwhee Joe

This paper describes the design and performance of a new AAL protocol (AAL-UDP for UDP/IP over wireless ATM ror rates and burstier error patterns in comparison with the fiber-based links for which ATM was designed. The purpose of AAL-UDP is to support time-critical UDP traffic over wireless ATM networks. The key ideas in the design consist of no discard at AAL level and header protection with s...

Journal: :Journal of bacteriology 2011
Susana Merino Natalia Jimenez Raquel Molero Lamiaa Bouamama Miguel Regué Juan M Tomás

The Aeromonas hydrophila AH-3 WecP represents a new class of UDP-HexNAc:polyprenol-P HexNAc-1-P transferases. These enzymes use a membrane-associated polyprenol phosphate acceptor (undecaprenyl phosphate [Und-P]) and a cytoplasmic UDP-d-N-acetylhexosamine sugar nucleotide as the donor substrate. Until now, all the WecA enzymes tested were able to transfer UDP-GlcNAc to the Und-P. In this study,...

Journal: :The Biochemical journal 1978
B Burchell

1. The purification to homogeneity of stable highly active preparations of UDP-glucuronyltransferase from liver of phenobarbital-treated rats is briefly described. 2. A single polypeptide was visible after sodium dodecyl sulphate/polyacrylamide-gel electrophoresis, of mol.wt.57000. 3. Antiserum raised against the pure enzyme produces a single sharp precipitin line after Ouchterlony double-diffu...

2008
Guilhem Janbon Frédérique Moyrand Ingrid Lafontaine Thierry Fontaine

Cryptococcus neoformans in UDP-Glucose/UDP-Galactose Equilibrium Regulate the UGE2 and UGE1

Journal: :Biochemistry 2000
R E Campbell S C Mosimann M E Tanner N C Strynadka

Bacterial UDP-N-acetylglucosamine 2-epimerase catalyzes the reversible epimerization at C-2 of UDP-N-acetylglucosamine (UDP-GlcNAc) and thereby provides bacteria with UDP-N-acetylmannosamine (UDP-ManNAc), the activated donor of ManNAc residues. ManNAc is critical for several processes in bacteria, including formation of the antiphagocytic capsular polysaccharide of pathogens such as Streptococc...

2001
Ryan J. R. McCleary

Hepatic UDP-GTs are partly responsible for metabolism of the thyroid hormone, thyroxine (T4), in mammals, but little is known of UDP-GT activity in birds. To determine the ontogenic pattern of UDP-GT activity in precocial birds, we measured activity in Japanese quail (Coturnix japonica) liver at days 12 and 14 of the 16.5-day incubation, 3 perihatch stages and <1, 1, 4, 6, 7, 20 and 42 days pos...

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