Results 211 to 220 of about 53,863 (261)
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Catecholates and mixed catecholate hydroxamates as artificial siderophores for mycobacteria
Biometals, 2004Different mono-, bis- or triscatecholates and mixed mono- or biscatecholate hydroxamates were synthesized as potential siderophores for mycobacteria. SiderOphore activity was tested by growth promotion assays using wild type strains and iron transport mutants of mycobacteria as well as Gram-negative bacteria.
Steffen, Wittmann +5 more
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Inhibition of catechol-o-methyl transferase by catechols and polyphenols
Biochemical Pharmacology, 1973Abstract The effects of the polyphenolic decarboxylase inhibitor, N1-(d,l-seryl)-N2-(2,3,4-Trihydroxybenzyl)-hydrazine (RO4-4602), were compared with the effects of dopa and pyrogallol as inhibitors of catechol-o-methyl transferase (COMT). The apparent Km, for [3H]norepinephrine as the substrate was 0.36 mM.
R J, Baldessarini, E, Greiner
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Acta Histochemica, 1977
Summary When catechol, the simplest o-dihydroxy aromatic compound, is oxidized in the presence of potassium alum, there results a solution which stains very similarly to an alum hematoxylin.
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Summary When catechol, the simplest o-dihydroxy aromatic compound, is oxidized in the presence of potassium alum, there results a solution which stains very similarly to an alum hematoxylin.
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Essays in Biochemistry, 1999
Catechol dioxygenases are key enzymes in the metabolism of aromatic rings by soil bacteria. Catechol dioxygenases have been found that participate in the metabolism of halogenated aromatic compounds and, in doing so, play a key role in bioremediation of halogenated pollutants.
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Catechol dioxygenases are key enzymes in the metabolism of aromatic rings by soil bacteria. Catechol dioxygenases have been found that participate in the metabolism of halogenated aromatic compounds and, in doing so, play a key role in bioremediation of halogenated pollutants.
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Toxicology and Applied Pharmacology, 2000
The catechol metabolites of estradiol, 2- and 4-hydroxyestradiol (2-OHE(2) and 4-OHE(2), respectively) are potent signaling molecules and are hypothesized to be central to estrogen-linked carcinogenesis. Methylation by catechol-O-methyltransferase (COMT) is the principal means of catechol estrogen (CE) deactivation in the liver and other tissues.
C E, Garner +3 more
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The catechol metabolites of estradiol, 2- and 4-hydroxyestradiol (2-OHE(2) and 4-OHE(2), respectively) are potent signaling molecules and are hypothesized to be central to estrogen-linked carcinogenesis. Methylation by catechol-O-methyltransferase (COMT) is the principal means of catechol estrogen (CE) deactivation in the liver and other tissues.
C E, Garner +3 more
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Nucleophilic Deoxyfluorination of Catechols
Organic Letters, 2011Nucleophilic deoxyfluorinaiton of one of the two hydroxyl groups of catechols has been developed via the Umpolung concept. This method was successively applied to naturally occurring catechols, such as catechins and dopamine, to produce novel fluorinated analogues.
Hiroyuki, Nemoto +2 more
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Journal of Steroid Biochemistry, 1988
Reaction of estrone-3,4-o-quinone with ethanethiol and glutathione leads to the formation of 4-hydroxyestrone-2-thioethers. Incubations of [1-3H]hydroxyestrone with rat liver microsomes and NADPH in the presence of glutathione results in the formation of 4-hydroxyestrone-S-glutathione with no release of tritium in the water indicating GSH addition to C-
Y J, Abul-Hajj, P L, Cisek
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Reaction of estrone-3,4-o-quinone with ethanethiol and glutathione leads to the formation of 4-hydroxyestrone-2-thioethers. Incubations of [1-3H]hydroxyestrone with rat liver microsomes and NADPH in the presence of glutathione results in the formation of 4-hydroxyestrone-S-glutathione with no release of tritium in the water indicating GSH addition to C-
Y J, Abul-Hajj, P L, Cisek
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Complexes of osmium(VI) with catechol and substituted catechols
Journal of the Chemical Society, Dalton Transactions, 1978Osmium tetraoxide reacts with catechols, R(OH)2-o, to give the tris(catecholato)-species [Os(O2R)3] and the polymers [{OsO(O2R)2}n], while in the presence of pyridine or substituted pyridines (L)trans-[OsO2(O2R)L2] complexes are formed. Reaction of cis-[OsO4(OH)2]2– or trans-[OsO2(OH)4]2– with catechols yields salts of trans-[OsO2(O2R)2]2–.
Alastair J. Nielson, William P. Griffith
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Catecholate derivatives of zirconocene: Facile methylation of a catecholate ring
Journal of Organometallic Chemistry, 2021Abstract Reaction of [Cp'2ZrMe2] (Cp' = η5-tBuC5H4) with 3,6-di-tert-butylcatechol (H2Cat36) leads to complex [Cp'2ZrCat36] (1). Analogous reaction of [Cp'2ZrMe2] with 3,6-di-tert-butyl-o-benzoquinone (Q36) results in migration of the methyl group from metal to the C6-ring and formation of a complex of 3-tert-butyl-6-methyl-catecholate [Cp'2ZrCat36Me]
Pavel A. Petrov +5 more
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Reactions of 3-ethylcatechol and 3-(methylthio)catechol with catechol dioxygenases
Archives of Biochemistry and Biophysics, 1986The reactions of 3-ethylcatechol and 3-(methylthio)catechol with catechol 1,2-dioxygenase and catechol 2,3-dioxygenase from Pseudomonas putida were examined. Both 3-substituted catechols are oxidized by catechol 2,3-dioxygenase at approximately 30% of the rate observed for catechol oxidation by this enzyme.
R A, Pascal, D S, Huang
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