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Nitrate oxide

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https://www.readbyqxmd.com/read/29143039/copper-nitrate-catalyzed-oxidative-coupling-of-unactivated-c-sp-3-h-bonds-of-ethers-and-alkanes-with-n-hydroxyphthalimide-synthesis-of-n-hydroxyimide-esters
#1
Xiaohe Xu, Jian Sun, Yuyan Lin, Jingya Cheng, Pingping Li, Yiyan Yan, Qi Shuai, Yuanyuan Xie
A copper nitrate-catalyzed cross-dehydrogenative coupling reaction between N-hydroxyphthalimide (NHPI) and ethers/alkanes has been described. The reaction is accomplished smoothly by using simple and green molecular oxygen as the oxidant, providing an alternative for the efficient synthesis of N-alkoxyphthalimides. In addition, it was found that when tert-butyl ethers were used as substrates, unexpected N-hydroxyimide ester derivatives were obtained in moderate to excellent yields. To further understand this unusual transformation, control experiments were performed and a plausible mechanism was proposed...
November 16, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/29140076/direct-analysis-of-lignin-phenols-in-freshwater-dissolved-organic-matter
#2
Hendrik Reuter, Julia Gensel, Marcus Elvert, Dominik Zak
A novel approach for the analysis of dissolved lignin in freshwaters is presented. Lignin concentrations in natural waters are low and a lignin extraction is usually required to obtain sufficient sample for analysis. In this method, extraction and dry down of the dissolved lignin are omitted and alkaline CuO oxidation is directly performed using 15 mL water sample in a microwave digestion system, thus reducing the required amount of sample and its preparation time considerably. Low procedural blank values are obtained by solid phase extraction (SPE) of the oxidized lignin phenols on HLB sorbents...
November 15, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29138675/benign-effect-of-extremely-low-frequency-electromagnetic-field-on-brain-plasticity-assessed-by-nitric-oxide-metabolism-during-poststroke-rehabilitation
#3
Natalia Cichoń, Piotr Czarny, Michał Bijak, Elżbieta Miller, Tomasz Śliwiński, Janusz Szemraj, Joanna Saluk-Bijak
Nitric oxide (NO) is one of the most important signal molecules, involved in both physiological and pathological processes. As a neurotransmitter in the central nervous system, NO regulates cerebral blood flow, neurogenesis, and synaptic plasticity. The aim of our study was to investigate the effect of the extremely low-frequency electromagnetic field (ELF-EMF) on generation and metabolism of NO, as a neurotransmitter, in the rehabilitation of poststroke patients. Forty-eight patients were divided into two groups: ELF-EMF and non-ELF-EMF...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/29138017/angiotensin-converting-enzyme-inhibitors-enhance-the-hypotensive-effects-of-propofol-by-increasing-nitric-oxide-production
#4
Gustavo H Oliveira-Paula, Lucas C Pinheiro, Graziele C Ferreira, Waynice N P Garcia, Riccardo Lacchini, Luis V Garcia, Jose E Tanus-Santos
Propofol anesthesia is usually accompanied by hypotension. Studies have shown that the hypotensive effects of propofol increase in patients treated with angiotensin-converting enzyme inhibitors (ACEi). Given that both propofol and ACEi affect nitric oxide (NO) signaling, the present study tested the hypothesis that ACEi treatment induces pronounced hypotensive responses to propofol by increasing NO bioavailability. In this study we evaluated 65 patients, divided into three groups: hypertensive patients chronically treated with ACEi (HT-ACEi; n=21), hypertensive patients treated with other antihypertensive drugs instead of ACEi, such as angiotensin II receptor blockers, β-blockers or diuretics (HT; n=21) and healthy normotensive subjects (NT; n=23)...
November 11, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/29137791/sonochemical-synthesis-and-characterization-of-new-seven-coordinated-zinc-cadmium-and-mercury-nitrate-complexes-new-precursors-for-nanostructure-metal-oxides
#5
S Mojahedi Jahromi, M Montazerozohori, A Masoudiasl, E Houshyar, S Joohari, J M White
The nitrate complexes of group 12 elements with a tridentate Schiff base ligand (L = (E)-N1-((E)-3- phenylallylidene)-N2-(2-((E)-((E)-3-phenylallylidene) amino)ethyl) ethane-1,2-diamine) were synthesized via sonochemical process and characterized by various physical and chemical methods. The structural analysis of the zinc nitrate complex by single crystal X-ray diffraction analysis shows that the central atom is seven-coordinated by three nitrogen atoms from the Schiff base ligand as well as four oxygen atoms from two different nitrate anions...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29137789/sonochemical-synthesis-of-graphene-ce-tio2-and-graphene-fe-tio2-ternary-hybrid-photocatalyst-nanocomposite-and-its-application-in-degradation-of-crystal-violet-dye
#6
T P Shende, B A Bhanvase, A P Rathod, D V Pinjari, S H Sonawane
The present work deals with the preparation of graphene oxide (GO) using Hummers-Offeman method in the presence of ultrasonic irradiations. Further loading of TiO2 photocatalyst on prepared GO was accomplished which is basically oxidation reduction reaction between graphene oxide and titanium isopropoxide that leads to the formation of graphene-TiO2 nanocomposite. Graphene-Ce-TiO2 and Graphene-Fe-TiO2 nanocomposites were prepared using one step in-situ ultrasound assisted method using GO, titanium isopropoxide, cerium nitrate, ferric nitrate, and 2-propanol...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29134523/effect-of-water-constituents-on-the-degradation-of-sulfaclozine-in-the-three-systems-uv-tio2-uv-k2s2o8-and-uv-tio2-k2s2o8
#7
Liliane Ismail, Corinne Ferronato, Ludovic Fine, Farouk Jaber, Jean-Marc Chovelon
Bicarbonate, phosphate, chloride ions, and humic substances are among the constituents most widely present in natural waters. These non-target constituents can greatly affect the efficiency of advanced oxidation processes used for water decontamination due to their capacity to interfere with the adsorption of the target compounds on the surface of TiO2, absorb photons, scavenge hydroxyl radicals (·OH), and generate photochemical reactive intermediates. In this work, the effect of these constituents on the degradation of sulfaclozine (SCL) was monitored in three different AOPs systems: UV/TiO2, UV/K2S2O8, and UV/TiO2/K2S2O8...
November 13, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29133913/nitric-oxide-mediated-inhibition-of-antigen-presentation-from-dcs-to-cd4-t-cells-in-cancer-and-measurement-of-stat1-nitration
#8
Joseph Markowitz, Jiang Wang, Zach Vangundy, Jia You, Vedat Yildiz, Lianbo Yu, Isaac P Foote, Owen E Branson, Andrew R Stiff, Taylor R Brooks, Brandon Biesiadecki, Thomas Olencki, Susheela Tridandapani, Michael A Freitas, Tracey Papenfuss, Mitch A Phelps, William E Carson
Myeloid derived suppressor cells (MDSC) produce nitric oxide (NO) and inhibit dendritic cell (DC) immune responses in cancer. DCs present cancer cell antigens to CD4(+) T cells through Jak-STAT signal transduction. In this study, NO donors (SNAP and DETA-NONOate) inhibited DC antigen presentation. As expected, MDSC isolated from peripheral blood mononuclear cells (PBMC) from cancer patients produced high NO levels. We hypothesized that NO producing MDSC in tumor-bearing hosts would inhibit DC antigen presentation...
November 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29131468/oxidative-dissolution-of-resoles-a-versatile-approach-to-intricate-nanostructures
#9
Min Zhang, Hao Song, Yannan Yang, Xiaodan Huang, Yang Liu, Chao Liu, Chengzhong Yu
Resoles are base-catalyzed phenol-formaldehyde resins with a 3-dimensional cross-linked framework. The chemistry of resoles is generally considered as highly chemical resistant, thus calcination is always used in the treatment of resole-type resin, which significantly limit the diversity of nanostructured materials derived from resole-type resins. Here we report that selected metal nitrate solutions can be applied to dissolve various types of nanostructured resoles through an oxidative dissolution mechanism...
November 13, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/29128773/evaluation-of-potassium-thiosulfate-as-a-nitrification-inhibitor-to-reduce-nitrous-oxide-emissions
#10
Zejiang Cai, Suduan Gao, Minggang Xu, Bradley D Hanson
Potassium thiosulfate (KTS, K2S2O3) has been shown to function as a nitrification inhibitor, thus has the potential to reduce nitrous oxide (N2O) emissions and play an important role in effective N management. The objective of this research was to determine the potential effects of KTS on N2O emissions and N transformation processes in comparison with commercial N transformation inhibitors (stabilizers). A laboratory incubation experiment was conducted using urea and ammonium nitrate (UAN) applied at 150mgNkg(-1) in a Hanford sandy loam soil (coarse-loamy, mixed, superactive, nonacid, thermic Typic Xerorthents)...
November 9, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29128547/associations-between-asymmetric-dimethylarginine-adma-nitrite-dependent-renal-carbonic-anhydrase-activity-and-plasma-testosterone-levels-in-hypogonadal-men
#11
Dimitrios Tsikas, Manfred Kinzel
BACKGROUND: Circulating inorganic nitrite (NO2(-)) is an abundant nitric oxide (NO) reservoir. Renal carbonic anhydrase (CA) mediates the absorption of urinary nitrite. The urinary nitrate-to-nitrite molar ratio UNOxR is a measure of nitrite-dependent renal CA activity. The CA family is also involved in the bioactivation of nitrite to S-nitrosothiols and NO. Thus, CA isoforms may combat atherosclerosis. METHODS: In plasma and urine of ten hypogonadal men we measured the major NO metabolites nitrite and nitrate, and the endogenous inhibitor of NO synthase (NOS) asymmetric dimethylarginine (ADMA) before and after a 24-weeks testosterone treatment to normalize plasma testosterone levels...
November 8, 2017: Hellenic Journal of Cardiology: HJC, Hellēnikē Kardiologikē Epitheōrēsē
https://www.readbyqxmd.com/read/29128400/strong-modulation-of-nitrite-reductase-activity-of-cytoglobin-by-disulfide-bond-oxidation-implications-for-nitric-oxide-homeostasis
#12
Brandon J Reeder, John Ukeri
Globin-mediated nitric oxide (NO) dioxygenase and nitrite reductase activities have been proposed to serve protective functions within the cell by scavenging or generating NO respectively. Cytoglobin has rapid NO dioxygenase activity, similar to other globins, however, the apparent rates of nitrite reductase activity have been reported as slow or negligible. Here we report that the activity of cytoglobin nitrite reductase activity is strongly dependent on the oxidation state of the two surface-exposed cysteine residues...
November 8, 2017: Nitric Oxide: Biology and Chemistry
https://www.readbyqxmd.com/read/29128121/occurrence-of-greenhouse-gases-in-the-aquifers-of-the-walloon-region-belgium
#13
Anna Jurado, Alberto V Borges, Estanislao Pujades, Vivien Hakoun, Joël Otten, Kay Knöller, Serge Brouyère
This work aims to (1) identify the most conductive conditions for the generation of greenhouses gases (GHGs) in groundwater (e.g., hydrogeological contexts and geochemical processes) and (2) evaluate the indirect emissions of GHGs from groundwater at a regional scale in Wallonia (Belgium). To this end, nitrous oxide (N2O), methane (CH4) and carbon dioxide (CO2) concentrations and the stable isotopes of nitrate (NO3(-)) and sulphate were monitored in 12 aquifers of the Walloon Region (Belgium). The concentrations of GHGs range from 0...
November 8, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29127829/bioaugmentation-of-rapid-sand-filters-by-microbiome-priming-with-a-nitrifying-consortium-will-optimize-production-of-drinking-water-from-groundwater
#14
Christian Nyrop Albers, Lea Ellegaard-Jensen, Lars Hestbjerg Hansen, Sebastian R Sørensen
Ammonium oxidation to nitrite and then to nitrate (nitrification) is a key process in many waterworks treating groundwater to make it potable. In rapid sand filters, nitrifying microbial communities may evolve naturally from groundwater bacteria entering the filters. However, in new filters this may take several months, and in some cases the nitrification process is never sufficiently rapid to be efficient or is only performed partially, with nitrite as an undesired end product. The present study reports the first successful priming of nitrification in a rapid sand filter treating groundwater...
November 6, 2017: Water Research
https://www.readbyqxmd.com/read/29127411/performance-of-solid-state-hybrid-energy-storage-device-using-reduced-graphene-oxide-anchored-sol-gel-derived-ni-nio-nanocomposite
#15
Himadri Tanaya Das, Kamaraj Mahendraprabhu, Thandavarayan Maiyalagan, Perumal Elumalai
The influence of (nickel nitrate/citric acid) mole ratio on the formation of sol-gel end products was examined. The formed Ni/NiO nanoparticle was anchored on to reduced graphene-oxide (rGO) by means of probe sonication. It was found that the sample obtained from the (1:1) nickel ion: citric acid (Ni(2+): CA) mole ratio resulted in a high specific capacity of 158 C/g among all (Ni(2+): CA) ratios examined. By anchoring Ni/NiO on to the rGO resulted in enhanced specific capacity of as high as 335 C/g along with improved cycling stability, high rate capability and Coulombic efficiency...
November 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29126024/nitrate-attenuation-in-low-permeability-sediments-based-on-isotopic-and-microbial-analyses
#16
Yuexia Wu, Ligang Xu, Sai Wang, Zhenglu Wang, Jianying Shang, Xiqing Li, Chunmiao Zheng
This study investigated nitrate attenuation in low-permeability sediments (LPS) in a multi-layer aquifer by integrating hydrochemical, isotopic and microbiological molecular techniques in a field site. In the meantime, the overlying high-permeability sediment (HPS) was also examined on the nitrate attenuation for the sake of comparison. Additionally, laboratory flow-through experiments were conducted to assess the overall nitrate reduction rate in the two types of sediment. The δ(15)N-NO3(-) and δ(34)S-SO4(2-) values were more enriched by approximately 37‰ and 15‰ in the LPS than the overlying HPS associated with substantial reductions of the NO3(-) and SO4(2-) concentration, indicating the occurrence of strong bio-reductions in nitrate and sulfate...
November 7, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29124705/uv-induced-mutagenicity-in-water-causes-detection-identification-and-prevention
#17
Roberta C H M Hofman-Caris
At first it seemed that UV processes for disinfection and advanced oxidation were "harmless", as they didn't involve the addition of "dangerous" chemicals nor seemed to result in the formation of toxic byproducts. However, recently it has become clear that also during UV processes mutagentic/genotoxic byproducts may be formed. It was found that these are nitrogen containing aromatic compounds, which are formed by the reaction of photolysis products of nitrate with (photolysis products of) natural organic matter...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/29124567/dimethyl-fumarate-modulates-oxidative-stress-and-inflammation-in-organs-after-sepsis-in-rats
#18
Amanda Della Giustina, Sandra Bonfante, Graciela Freitas Zarbato, Lucinéia Gainski Danielski, Khiany Mathias, Aloir Neri de Oliveira, Leandro Garbossa, Taise Cardoso, Maria Eduarda Fileti, Raquel Jaconi De Carli, Mariana Pereira Goldim, Tatiana Barichello, Fabricia Petronilho
Sepsis is defined as life-threatening organ dysfunction induced by a disrupted host response to infecting pathogens. Evidences suggest that oxidative stress is intrinsically related to sepsis progression. Dimethyl fumarate (DMF) is a novel oral therapeutic agent with anti-oxidant properties which exerts protective effects through activation of nuclear factor erythroid 2 (NFE2)-related factor 2 (Nrf2). Thus, the aim of this study is to evaluate the effect of DMF in different organs of rats submitted to an animal model of sepsis...
November 9, 2017: Inflammation
https://www.readbyqxmd.com/read/29121579/a-process-oriented-hydro-biogeochemical-model-enabling-simulation-of-gaseous-carbon-and-nitrogen-emissions-and-hydrologic-nitrogen-losses-from-a-subtropical-catchment
#19
Wei Zhang, Yong Li, Bo Zhu, Xunhua Zheng, Chunyan Liu, Jialiang Tang, Fang Su, Chong Zhang, Xiaotang Ju, Jia Deng
Quantification of nitrogen losses and net greenhouse gas (GHG) emissions from catchments is essential for evaluating the sustainability of ecosystems. However, the hydrologic processes without lateral flows hinder the application of biogeochemical models to this challenging task. To solve this issue, we developed a coupled hydrological and biogeochemical model, Catchment Nutrients Management Model - DeNitrification-DeComposition Model (CNMM-DNDC), to include both vertical and lateral mass flows. By incorporating the core biogeochemical processes (including decomposition, nitrification, denitrification and fermentation) of the DNDC into the spatially distributed hydrologic framework of the CNMM, the simulation of lateral water flows and their influences on nitrogen transportation can be realized...
November 6, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29116885/feline-toxoplasmosis-tumor-necrosis-factor-nitric-oxide-and-free-radicals-in-seropositive-cats
#20
Joice Faria, Caroline Couto, Sheron Wierzynski, Nathieli Bottari, Matheus Baldissera, Wanderson Pereira, Aleksandro Da Silva
Toxoplasma gondii is a cosmopolitan protozoan that causes disease in several species, including humans. In cats, these infections are usually asymptomatic, but in other species it can lead to high levels of inflammatory and cell damage markers, which may cause cellular damage. Therefore, the aim of this study was to measure levels of tumor necrosis factor (TNF-α), reactive oxygen species (ROS), and nitric oxide (nitrite/nitrate - NOx) in the serum of cats seropositive for T. gondii. Initially, we investigated the presence of antibodies against T...
November 10, 2017: Journal of Parasitology
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