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Showing 1 to 20 of 76 for “"Hydroxylamine"”.
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Studies of nucleophilic displacement at nitrogen of hydroxylamine derivatives
Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:55:18Z Item is restricted indefinitely.
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Design and Synthesis of Hydroxylamine Derivatives as Indoleamine - 2,3 - Dioxygenase Inhibitors
… led to our lead compound, <i>O</i>-benzylhydroxylamine, which exhibited sub-micromolar inhibition towards IDO. Structure-activity studies were conducted and focused on the design and synthesis of <i>O</i> benzylhydroxylamine analogues. The addition of a second aryl ring was discovered to …
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I. Studies on Streptomyces' Antibiotics. Ii. Bound Hydroxylamine From Streptomyces Venezuelae
Made available in DSpace on 2014-12-05T19:37:24Z (GMT). No. of bitstreams: 1 6001666.pdf: 4546956 bytes, checksum: a55c4c2c6612ff1dbb272c97ac469303 (MD5) Previous issue date: 1960
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Hydroxylamine-N, N-disulphonates and nitrosodisulphonates: preparations, characterizations, and magnetic and spectroscopic properties
A series of hydroxylamine-N,N-disulphonate and nitrosodisulphonate salts with monovalent cations have been prepared and characterized. The salts of the hydroxylamine-N,N-disulphonate ion crystallize with either [(S03)2NOH]2- ions or {[ (S03)2N0]2H}5- groups. In general, salts with [(S03)2NOH]2- …
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Biofilm-related Materials as Total N-nitrosamine (TONO) Precursors and Hydroxylamine-based Interferences in TONO and N-nitrosodimethylamine (NDMA) Measurements
… potential N-nitrosamine precursors. The role of hydroxylamine - a nitrification intermediate - was assessed as a function of five sample treatments related to the TONO assay (Untreated, HgCl2 only, sulfanilamide [SAA] only, HgCl2 + SAA, and HCl) in terms of aqueous phase TONO, SPE-TONO and NDMA …
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Optimisation of selective extraction techniques as a tool for geochemical mapping in the Southern Africa region
… investigation therefore focuses on the use of hydroxylamine partial extraction geochemistry for geochemical mapping in regolith over two contrasting environments viz; aeolian sand-calcrete regolith over Au mineralization at Amalia Blue Dot Mine in South Africa and lateritic regolith covering …
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Development of Catalyst on Polymer Support for Organic Compounds Destruction
… modification mixture consisting of hydrazine and hydroxylamine to convert the nitrile groups of PAN fibre with the resultant formation of carboxylate, amine and hydroxamic groups. These functional groups are able to ligate cations of multivalent metals (e.g. iron (III)) to the fibre which then …
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Laboratory Studies of Gas-Grain Processes on Cosmic Dust Analogues
… of two oxygen-containing molecules, water and hydroxylamine, is studied next. Water is the main component of ice mantles in dense clouds and is indispensable for the origin of life. Its formation via ozone hydrogenation on an analog of a warm dust grain is studied experimentally. The desorption …
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The Hydroxamate Reaction of Aminoacyl-tRNA Synthetases
… activation reactions in high concentrations of hydroxylamine. This thesis comprises a study of the hydroxamate reaction of the aminoacyl-tRNA synthetases. Each of fourteen partially purified aminoacyl-tRNA synthetases from E. coli was assayed for the rates of formation of amino acid hydroxamate …
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Elucidating the Reactivity of Cytochrome P460: Maturation, Product Selectivity, and Substrate Scope
… producing step by AOB is performed by the enzyme hydroxylamine oxidoreductase, which oxidizes hydroxylamine (NH2OH) to nitric oxide (NO). Another enzyme expressed by AOB, cytochrome P460, can also oxidize NH2OH but produces nitrous oxide (N2O). The ability of these enzymes to oxidize NH2OH is …
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Structure-Activity Relationship Studies of Mitochondrial Uncouplers and PilB Inhibitors
… investigate in vitro and in vivo properties of hydroxylamine and hydrazine BAM15 derivatives and reveal the high uncoupling nature of these compounds. Our structure-activity relationship (SAR) studies demonstrated that the hydroxylamine BAM15 analogs are more potent than hydrazine ones, with …
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Reductively triggered internal cyclisation reactions
… products. Reduction stoichiometry implicates the hydroxylamine as the predominant reduction product of radiolysis of the 2-nitrophenylalkanamide precursors, which varied in the nature of substitution of the nitrobenzyl ring, 4-substitution of the leaving aniline, and overall geometry. Cyclisation …
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The regulation of genes of unknown function implicated in nitrosative stress tolerance in Escherichia coli K-12
… were not more sensitive to nitric oxide or hydroxylamine compared with the parental strain, suggesting that the products of this operon are not essential for dealing with these toxic nitrogen species. Conversely, a strain deleted in \(hcp-hcr\) was shown to be slightly more sensitive to both …
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Ammonia-monooxygenase-mediated cometabolic biotransformation and abiotic transformation of micropollutants
… AMO was inhibited by octyne. More interestingly, hydroxylamine, the product of ammonia oxidization by AMO was found to react with several MPs, most of which were also biotransformed by the AOB/NOB co-culture. Moreover, TP230 and TP 274 could also be detected in hydroxylamine added abiotic samples. …
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The Heme-Lysine Cross-Link of Cytochrome P460: Effects on Catalysis and Mechanism of Formation
… bacteria, and comammox bacteria the enzyme hydroxylamine oxidoreductase (HAO) is able to convert hydroxylamine (NH2OH) to nitric oxide (NO). What makes HAO unique is the presence of a P460 cofactor, which has been observed in only one other known protein family: cytochrome (cyt) P460. The …
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Elucidating the Roles of Conserved Active Site Amino Acids in the Escherichia coli Cytochrome c Nitrite Reductase
… respiration. NrfA also reduces nitric oxide and hydroxylamine to ammonium. The reduction of substrate is carried out at the distal position of a lysine ligated heme and in an active site cavity dominated by a conserved catalytic triad of histidine, tyrosine and arginine residues. The role of the …
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Total synthesis of (-)-tantazole B. Total synthesis of (+,-)-FR900482
… and efficient oxidation of the amine to the hydroxylamine.
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The Oximes of 1-(3-Methoxy-4-Agetoxyphenyl)-2, 6-Dicarbethoxycyclohex-Anedione-3,5 and their Derivatives
… by the reaction of the carbonyl group with hydroxylamine or by the reaction of nitrous acid or nitrous acid esters on compounds containing reactive methylene groups. These isonitroso compounds rearrange to oximes. |Oximes are most often used for purposes of preparing 1,2 dike to compounds. …
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