Results 201 to 210 of about 58,088 (256)
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Xanthine oxidase and xanthine dehydrogenase
The FASEB Journal, 1995Xanthine oxidase and xanthine dehy‐drogenase are enzymes involved in the metabolism of purines and pyrimidines in various organisms. Their relationship to one another has been the subject of considerable debate, primarily because of their proposed roles in ischemia/reperfasion damage in tissues.
Russ Hille, Takeshi Nishino
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Urology, 2006
Xanthine calculi are uncommonly encountered stones. When they occur, they typically do so in association with inborn metabolic disorders such as hereditary xanthinuria or Lesch-Nyhan syndrome. They may also occur in association with states of profound hyperuricemia such as myeloproliferative disease after treatment with allopurinol.
Vernon M, Pais +4 more
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Xanthine calculi are uncommonly encountered stones. When they occur, they typically do so in association with inborn metabolic disorders such as hereditary xanthinuria or Lesch-Nyhan syndrome. They may also occur in association with states of profound hyperuricemia such as myeloproliferative disease after treatment with allopurinol.
Vernon M, Pais +4 more
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The reactions of chloroperoxidase in the presence of xanthine/xanthine oxidase
Biochemical and Biophysical Research Communications, 1989Spectral data are presented which indicate that chloroperoxidase is converted to compound II during the reaction with superoxide/hydrogen peroxide generated in the xanthine/xanthine oxidase system. Upon completion of compound II formation, compound II returns back to the native state of chloroperoxidase without formation of detectable intermediates. It
D, Metodiewa, M, Pickard, H B, Dunford
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Aromaticity of caffeine, xanthine and the dimethyl xanthines
Tetrahedron Letters, 2014Xanthine, caffeine and three isomeric dimethyl xanthines (theobromine, theophylline and paraxanthine) are often described as aromatic on various criteria. Here we complete the picture by assessing these molecules for aromaticity on the ring-current criterion.
Christopher M. Gibson, Patrick W. Fowler
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Palladium compounds of xanthine and xanthine derivatives
Inorganica Chimica Acta, 1983The biological importance of purine bases is well known. The interaction of metal ions with nucleic acids, nucleotides and nucleotides has been an active area of inorganic and structural chemistry during the last few years, and a number of recent reviews exist on the subject [1, 2].
E. Colacio +4 more
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[Xanthine oxidase (xanthine dehydrogenase)].
Nihon rinsho. Japanese journal of clinical medicine, 1997Xanthine oxidase (xanthine dehydrogenase) is composed of two identical subunits of approximately 150,000 daltons. Each subunit contains four oxdation-reduction active cofactors/monomers. In vivo, the enzyme exists mostly as the dehydrogenase type (the NAD-dependent type).
S, Sumi, Y, Wada
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Regulation of xanthine dehydrogenase and xanthine oxidase activity by hypoxia
American Journal of Physiology-Lung Cellular and Molecular Physiology, 1996The present study determined the effect of hypoxia on xanthine dehydrogenase (XDH) and xanthine oxidase (XO) activity and gene and protein expression in cultured bovine aortic endothelial cells (BAEC). BAEC were exposed to hypoxia (3% O2) or anoxia (0% O2) for 24 or 48 h and to 24 h of hypoxia followed by 24 h of reoxygenation.
W B, Poss +4 more
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Tautomerism of xanthine and alloxanthine: A model for substrate recognition by xanthine oxidase
Journal of Computer-Aided Molecular Design, 1996Tautomerism of neutral xanthine and alloxanthine has been examined both in the gas phase and in aqueous solution. The tautomeric preference in the gas phase has been studied by means of semiempirical and ab initio quantum-mechanical computations with inclusion of correlation effects at the Møller-Plesset level, and from density-functional calculations.
Begoña Hernández +2 more
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Ischaemic Brain Oedema and Xanthine-Xanthine Oxidase System
1990The formation of oxygen-derived free radicals in cerebral ischaemia has been implicated in altering the BBB permeability, cause oedema and tissue damage. However little attention has been paid regarding the involvement of xanthine oxidase in the cerebral ischaemic events.
Y, Kinuta, H, Kikuchi, M, Ishikawa
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The Mechanism of Conversion of Xanthine Dehydrogenase to Xanthine Oxidase
1998Xanthine dehydrogenase and xanthine oxidase are complex metalloflavoproteins that represent alternate forms of the same gene product. The cDNAs encoding the enzymes have been cloned from several sources, and structural information is becoming available.
Takeshi Nishino +4 more
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