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Pesquisa : D01.625.062.437 [Categoria DeCS]
Referências encontradas : 1424 [refinar]
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  1 / 1424 MEDLINE  
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PMID:28714295
Autor:Chang Z; Henkensmeier D; Chen R
Endereço:Transfercenter Sustainable Electrochemistry, Saarland University, 66125, Saarbrücken, Germany.
Título:One-Step Cationic Grafting of 4-Hydroxy-TEMPO and its Application in a Hybrid Redox Flow Battery with a Crosslinked PBI Membrane.
Fonte:ChemSusChem; 10(16):3193-3197, 2017 Aug 24.
ISSN:1864-564X
País de publicação:Germany
Idioma:eng
Resumo:By using a one-step epoxide ring-opening reaction between 4-hydroxy-2,2,6,6-tetramethylpiperidine 1-oxyl (4-hydroxy-TEMPO) and glycidyltrimethylammonium cation (GTMA ), we synthesized a cation-grafted TEMPO (g -TEMPO) and studied its electrochemical performance against a Zn /Zn anode in a hybrid redox flow battery. To conduct Cl counter anions, a crosslinked methylated polybenzimidazole (PBI) membrane was prepared and placed between the catholyte and anolyte. Compared to 4-hydroxy-TEMPO, the positively charged g - TEMPO exhibits enhanced reaction kinetics. Moreover, flow battery tests with g -TEMPO show improved Coulombic, voltage, and energy efficiencies and cycling stability over 140 cycles. Crossover of active species through the membrane was not detected.
Tipo de publicação: JOURNAL ARTICLE
Nome de substância:0 (Benzimidazoles); 0 (Cyclic N-Oxides); 0 (Membranes, Artificial); 0 (Polymers); 0 (poly(benzimidazole)); 2FP81O2L9Z (Hydroxylamine); V55XB6IT82 (TEMPOL-H)


  2 / 1424 MEDLINE  
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PMID:28646425
Autor:Ascenzi P; Ciaccio C; Gasperi T; Pesce A; Caporaso L; Coletta M
Endereço:Interdepartmental Laboratory for Electron Microscopy, Roma Tre University, 00146, Rome, Italy. ascenzi@uniroma3.it.
Título:Hydroxylamine-induced oxidation of ferrous carbonylated truncated hemoglobins from Mycobacterium tuberculosis and Campylobacter jejuni is limited by carbon monoxide dissociation.
Fonte:J Biol Inorg Chem; 22(6):977-986, 2017 Aug.
ISSN:1432-1327
País de publicação:Germany
Idioma:eng
Resumo:Hydroxylamine (HA) is an oxidant of ferrous globins and its action has been reported to be inhibited by CO, even though this mechanism has not been clarified. Here, kinetics of the HA-mediated oxidation of ferrous carbonylated Mycobacterium tuberculosis truncated hemoglobin N and O (Mt-trHbN(II)-CO and Mt-trHbO(II)-CO, respectively) and Campylobacter jejuni truncated hemoglobin P (Cj-trHbP(II)-CO), at pH 7.2 and 20.0 °C, are reported. Mixing Mt-trHbN(II)-CO, Mt-trHbO(II)-CO, and Cj-trHbP(II)-CO solution with the HA solution brings about absorption spectral changes reflecting the disappearance of the ferrous carbonylated derivatives with the concomitant formation of the ferric species. HA oxidizes irreversibly Mt-trHbN(II)-CO, Mt-trHbO(II)-CO, and Cj-trHbP(II)-CO with the 1:2 stoichiometry. The dissociation of CO turns out to be the rate-limiting step for the oxidation of Mt-trHbN(II)-CO, Mt-trHbO(II)-CO, and Cj-trHbP(II)-CO by HA. Values of the second-order rate constant for HA-mediated oxidation of Mt-trHbN(II)-CO, Mt-trHbO(II)-CO, and Cj-trHbP(II)-CO range between 8.8 × 10 and 8.6 × 10 M s , reflecting different structural features of the heme distal pocket. This study (1) demonstrates that the inhibitory effect of CO is linked to the dissociation of this ligand, giving a functional basis to previous studies, (2) represents the first comparative investigation of the oxidation of ferrous carbonylated bacterial 2/2 globins belonging to the N, O, and P groups by HA, (3) casts light on the correlation between kinetics of HA-mediated oxidation and carbonylation of globins, and (4) focuses on structural determinants modulating the HA-induced oxidation process.
Tipo de publicação: JOURNAL ARTICLE
Nome de substância:0 (Truncated Hemoglobins); 2FP81O2L9Z (Hydroxylamine); 42VZT0U6YR (Heme); 7U1EE4V452 (Carbon Monoxide); E1UOL152H7 (Iron)


  3 / 1424 MEDLINE  
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PMID:28474199
Autor:Druzhko AB; Dyukova TV; Pirutin SK
Endereço:Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Institutskaya ul. 3, Pushchino, Moscow region, 142290, Russia. druzhko@iteb.ru.
Título:Some factors affecting the process of photoinduced hydroxylaminolysis in different bacteriorhodopsin-based media.
Fonte:Eur Biophys J; 46(6):509-515, 2017 Sep.
ISSN:1432-1017
País de publicação:Germany
Idioma:eng
Resumo:This review presents the results of studies concerning some factors that affect the process of photoinduced hydroxylaminolysis (PHA) in bacteriorhodopsin (BR) and different BR-based media. We consider the peculiar properties of the PHA reaction in water suspensions of BR and BR-based media depending on variation in PHA ingredients, and in particular the use of O-substituted hydroxylamines instead of hydroxylamine hydrochloride. In addition, we discuss how such factors as preliminary ultra-sonication affect the reaction of PHA in the course of BR bleaching and following the reconstitution of bacterioopsin. All the results are considered from the viewpoint of improving the performance of BR-based media as photosensitive materials for the processing and storage of optical information.
Tipo de publicação: JOURNAL ARTICLE; REVIEW
Nome de substância:2FP81O2L9Z (Hydroxylamine); 53026-44-1 (Bacteriorhodopsins)


  4 / 1424 MEDLINE  
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PMID:28438312
Autor:Chen L; Peng Y; Tang M; Wu F
Endereço:Department of Chemical and Environmental Engineering, University of California, Riverside, Riverside, CA 92521, USA; School of Resources and Environmental Science, Wuhan University, Wuhan, 430079, PR China.
Título:Comment on "Combination of cupric ion with hydroxylamine and hydrogen peroxide for the control of bacterial biofilms on RO membranes by Hye-Jin Lee, Hyung-Eun Kim, Changha Lee [Water Research 110, 2017, 83-90]".
Fonte:Water Res; 118:289-290, 2017 Jul 01.
ISSN:1879-2448
País de publicação:England
Idioma:eng
Resumo:The methodology employed by Lee et al. to terminate their bactericidal assays was found to be flawed via our demonstrations. Briefly, EDTA or sulfite combining with cupric ion did not fully terminate, and instead even boosted the P. aeruginosa death. We therefore suggested them to seek for other means of reaction termination, such as the combination of buffering agent PBS and Cu(II)-complexing agent EDTA.
Tipo de publicação: JOURNAL ARTICLE
Nome de substância:0 (Hydroxylamines); 2FP81O2L9Z (Hydroxylamine); BBX060AN9V (Hydrogen Peroxide)


  5 / 1424 MEDLINE  
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PMID:28358480
Autor:Hou X; Huang X; Jia F; Ai Z; Zhao J; Zhang L
Endereço:Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental & Applied Chemistry, Central China Normal University , Wuhan 430079, P. R. China.
Título:Hydroxylamine Promoted Goethite Surface Fenton Degradation of Organic Pollutants.
Fonte:Environ Sci Technol; 51(9):5118-5126, 2017 May 02.
ISSN:1520-5851
País de publicação:United States
Idioma:eng
Resumo:In this study, we construct a surface Fenton system with hydroxylamine (NH OH), goethite (α-FeOOH), and H O (α-FeOOH-HA/H O ) to degrade various organic pollutants including dyes (methyl orange, methylene blue, and rhodamine B), pesticides (pentachlorophenol, alachlor, and atrazine), and antibiotics (tetracycline, chloramphenicol, and lincomycin) at pH 5.0. In this surface Fenton system, the presence of NH OH could greatly promote the H O decomposition on the α-FeOOH surface to produce ·OH without releasing any detectable iron ions during the alachlor degradation, which was different from some previously reported heterogeneous Fenton counterparts. Moreover, the ·OH generation rate constant of this surface Fenton system was 10 -10 times those of previous heterogeneous Fenton processes. The interaction between α-FeOOH and NH OH was investigated with using attenuated total reflectance Fourier transform infrared spectroscopy and density functional theory calculations. The effective degradation of organic pollutants in this surface Fenton system was ascribed to the efficient Fe(III)/Fe(II) cycle on the α-FeOOH surface promoted by NH OH, which was confirmed by X-ray photoelectron spectroscopy analysis. The degradation intermediates and mineralization of alachlor in this surface Fenton system were then systematically investigated using total organic carbon and ion chromatography, liquid chromatography-mass spectrometry, and gas chromatography-mass spectrometry. This study offers a new strategy to degrade organic pollutants and also sheds light on the environmental effects of goethite.
Tipo de publicação: JOURNAL ARTICLE
Nome de substância:0 (Ferric Compounds); 0 (Hydroxylamines); 2FP81O2L9Z (Hydroxylamine); BBX060AN9V (Hydrogen Peroxide); E1UOL152H7 (Iron)


  6 / 1424 MEDLINE  
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PMID:28242464
Autor:Wang XX; Fang F; Chen YP; Guo JS; Li K; Wang H
Endereço:Key Laboratory of the Three Gorges Reservoir Region's Eco-Environments of MOE, Chongqing University, Chongqing 400045, China.
Título:N O micro-profiles in biofilm from a one-stage autotrophic nitrogen removal system by microelectrode.
Fonte:Chemosphere; 175:482-489, 2017 May.
ISSN:1879-1298
País de publicação:England
Idioma:eng
Resumo:Emission of nitrous oxide (N O), a greenhouse gas, is of growing concern in biological wastewater treatment. N O emission from biofilm in a one-stage completely autotrophic nitrogen removal system was investigated using microelectrodes in this study. It is indicated that the pathways of nitrogen transformation in biofilm mainly included partial nitrification and anaerobic ammonium oxidation (anammox), also included nitrification and heterotrophic denitrification (HD). Ammonium-oxidizing bacteria (AOB) denitrification and HD were the main pathways resulting in N O production in the biofilm, and hydroxylamine (NH OH) oxidation was a subordinate pathway. In addition, the amount of N O emission in test in which both NH and NO were added (NH -N: NO -N = 1:1) was about 2 times greater than that in test with NH addition only. This result expressed that NO is an important factor affecting N O production in the biofilm. In conclusion, the present study provides a theoretical support for reducing N O production in one-stage completely autotrophic nitrogen removal system.
Tipo de publicação: JOURNAL ARTICLE
Nome de substância:0 (Ammonium Compounds); 0 (Sewage); 0 (Waste Water); 2FP81O2L9Z (Hydroxylamine); K50XQU1029 (Nitrous Oxide); S88TT14065 (Oxygen)


  7 / 1424 MEDLINE  
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PMID:28242385
Autor:Padhi SK; Tripathy S; Mohanty S; Maiti NK
Endereço:Environmental Microbiology, Division of Fish Health Management, Central Institute of Freshwater Aquaculture, Kaushalyaganga, Bhubaneswar 751002, Odisha, India.
Título:Aerobic and heterotrophic nitrogen removal by Enterobacter cloacae CF-S27 with efficient utilization of hydroxylamine.
Fonte:Bioresour Technol; 232:285-296, 2017 May.
ISSN:1873-2976
País de publicação:England
Idioma:eng
Resumo:Heterotrophic bacterium, Enterobacter cloacae CF-S27 exhibited simultaneous nitrification and aerobic denitrification in presence of high concentration of hydroxylamine. With the initial nitrogen concentration of 100mgL h , ammonium, nitrate and nitrite removal efficiencies were 81%, 99.9% and 92.8%, while the corresponding maximum removal rates reached as high as 11.6, 15.1 and 11.2mgL h respectively. Quantitative amplification by real time PCR and enzyme assay demonstrated that hydroxylamine reductase gene (hao) is actively involved in hetrotrophic nitrification and aerobic denitrification process of Enterobacter cloacae CF-S27. PCR primers were designed targeting amplification of hao gene from diversified environmental soil DNA. The strain Enterobacter cloacae CF-S27 significantly maintained the undetectable amount of dissolved nitrogen throughout 60days of zero water exchange fish culture experiment in domestic wastewater.
Tipo de publicação: JOURNAL ARTICLE
Nome de substância:0 (Ammonium Compounds); 0 (Waste Water); 2FP81O2L9Z (Hydroxylamine); N762921K75 (Nitrogen)


  8 / 1424 MEDLINE  
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PMID:28192347
Autor:Sabba F; Picioreanu C; Boltz JP; Nerenberg R
Endereço:Department of Civil and Environmental Engineering and Earth Science, University of Notre Dame, 156 Fitzpatrick Hall, Notre Dame, IN 46556, USA E-mail: rnerenbe@nd.edu.
Título:Predicting N O emissions from nitrifying and denitrifying biofilms: a modeling study.
Fonte:Water Sci Technol; 75(3-4):530-538, 2017 02.
ISSN:0273-1223
País de publicação:England
Idioma:eng
Resumo:Wastewater treatment plants can be significant sources of nitrous oxide (N O), a potent greenhouse gas. While our understanding of N O emissions from suspended-growth processes has advanced significantly, less is known about emissions from biofilm processes. Biofilms may behave differently due to their substrate gradients and microbial stratification. In this study, we used mathematical modeling to explore the mechanisms of N O emissions from nitrifying and denitrifying biofilms. Our ammonia-oxidizing bacteria biofilm model suggests that N O emissions from biofilm can be significantly greater than from suspended-growth systems. The driving factor is the diffusion of hydroxylamine, a nitrification intermediate, from the aerobic to the anoxic regions of the biofilm. The presence of nitrite-oxidizing bacteria further increased emissions. For denitrifying biofilms, our results suggest that emissions are generally greater than for suspended-growth systems. However, the magnitude of the difference depends on the bulk dissolved oxygen, chemical oxygen demand, and nitrate concentrations, as well as the biofilm thickness. Overall, the accumulation and diffusion of key intermediates, i.e. hydroxylamine and nitrite, distinguish biofilms from suspended-growth systems. Our research suggests that the mechanisms of N O emissions from biofilms are much more complex than suspended-growth systems, and that emissions may be higher in many cases.
Tipo de publicação: JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
Nome de substância:0 (Nitrites); 0 (Waste Water); 2FP81O2L9Z (Hydroxylamine); K50XQU1029 (Nitrous Oxide); S88TT14065 (Oxygen)


  9 / 1424 MEDLINE  
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PMID:28192343
Autor:Lang L; Pocquet M; Ni BJ; Yuan Z; Spérandio M
Endereço:LISBP, Université de Toulouse, CNRS, INRA, INSA, Toulouse, France E-mail: sperandio@insa-toulouse.fr.
Título:Comparison of different two-pathway models for describing the combined effect of DO and nitrite on the nitrous oxide production by ammonia-oxidizing bacteria.
Fonte:Water Sci Technol; 75(3-4):491-500, 2017 02.
ISSN:0273-1223
País de publicação:England
Idioma:eng
Resumo:The aim of this work is to compare the capability of two recently proposed two-pathway models for predicting nitrous oxide (N O) production by ammonia-oxidizing bacteria (AOB) for varying ranges of dissolved oxygen (DO) and nitrite. The first model includes the electron carriers whereas the second model is based on direct coupling of electron donors and acceptors. Simulations are confronted to extensive sets of experiments (43 batches) from different studies with three different microbial systems. Despite their different mathematical structures, both models could well and similarly describe the combined effect of DO and nitrite on N O production rate and emission factor. The model-predicted contributions for nitrifier denitrification pathway and hydroxylamine pathway also matched well with the available isotopic measurements. Based on sensitivity analysis, calibration procedures are described and discussed for facilitating the future use of those models.
Tipo de publicação: JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
Nome de substância:0 (Nitrites); 2FP81O2L9Z (Hydroxylamine); 7664-41-7 (Ammonia); K50XQU1029 (Nitrous Oxide); S88TT14065 (Oxygen)


  10 / 1424 MEDLINE  
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PMID:28185984
Autor:Liang YF; Zhang DD; Yu XJ; Gao HL; Liu KL; Qi J; Li HB; Yi QY; Chen WS; Cui W; Zhu GQ; Kang YM
Endereço:Department of Physiology and Pathophysiology, Xi'an Jiaotong University School of Basic Medical Sciences, Key Laboratory of Environment and Genes Related to Diseases (Xi'an Jiaotong University), Ministry of Education, Xi'an 710061, China.
Título:Hydrogen sulfide in paraventricular nucleus attenuates blood pressure by regulating oxidative stress and inflammatory cytokines in high salt-induced hypertension.
Fonte:Toxicol Lett; 270:62-71, 2017 Mar 15.
ISSN:1879-3169
País de publicação:Netherlands
Idioma:eng
Resumo:Hydrogen sulfide (H S) is an important gaseous signaling molecule in neuro-modulation, anti-inflammatory, anti-oxidant and anti-hypertensive effects. The paraventricular nucleus (PVN) is a major integrative nucleus in regulating BP and SNA. The aim of this study is to explore whether endogenous or exogenous H S changed by hydroxylamine hydrochloride (HA) or GYY4137 infused in the PVN affects RSNA and MAP by regulating oxidative stress or the balance between pro-inflammatory cytokines (PICs) and anti-inflammatory cytokines in high salt-induced hypertensive rats. Male Dahl rats were fed by high-salt or normal-salt diet. At the end of the 4th week, GYY4137, HA or vehicle was microinjected into bilateral PVN for 6 weeks. The levels of MAP, HR, plasma norepinephrine (NE), reactive oxygen species (ROS), NOX2, NOX4 and IL-1ß were increased significantly in high salt-induced hypertensive rats. Higher levels of these parameters were detected in the group treated by HA, but lower levels in the GYY4137 group. The trends of H S, CBS, IL-10 and Cu/Zn SOD were opposite to the parameters described above. These findings suggest that endogenous or exogenous H S in the PVN attenuates sympathetic activity and hypertensive response, which are partly due to decrease of ROS and PICs within the PVN in high salt-induced hypertension.
Tipo de publicação: JOURNAL ARTICLE
Nome de substância:0 (Anti-Inflammatory Agents); 0 (GYY 4137); 0 (Interleukin-1beta); 0 (Membrane Glycoproteins); 0 (Morpholines); 0 (Organothiophosphorus Compounds); 0 (Reactive Oxygen Species); 0 (Sodium Chloride, Dietary); 130068-27-8 (Interleukin-10); 2FP81O2L9Z (Hydroxylamine); EC 1.15.1.1 (Superoxide Dismutase); EC 1.6.3.- (Cybb protein, rat); EC 1.6.3.- (NADPH Oxidase 2); EC 1.6.3.- (NADPH Oxidase 4); EC 1.6.3.- (NADPH Oxidases); EC 1.6.3.- (Nox4 protein, rat); EC 4.2.1.22 (Cystathionine beta-Synthase); X4W3ENH1CV (Norepinephrine); YY9FVM7NSN (Hydrogen Sulfide)



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