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Nitrate oxide

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https://www.readbyqxmd.com/read/28813595/activation-of-a-nickel-based-oer-catalyst-on-a-hematite-photoanode-via-incorporation-of-cerium-for-photoelectrochemical-water-oxidation
#1
Hyungseob Lim, Jae Young Kim, Edward J Evans, Amritesh Rai, Jun-Hyuk Kim, Bryan R Wygant, Charles Buddie Mullins
There has been debate on whether Ni(OH)2 is truly catalytically active for the photo/-electrocatalytic oxygen evolution reaction. In this report, we have synthesized a Ni(OH)2 co-catalyst on a hematite photoanode and showed that, as has been proposed in other studies, the current density varies as a function of scan rate, which arise due to a photo-induced capacitive charging effect. We have discovered that this photo-induced charging of Ni2+/3+ can be overcome by mixing cerium nitrate into the Ni precursor solution...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28805340/scalable-dry-production-of-superior-3d-net-like-feox-c-composite-anode-material-for-lithium-ion-battery
#2
Min Li, Haoran Du, Long Kuai, Kuangfu Huang, Yuanyuan Xia, Baoyou Geng
Carbon-based transition metal oxides are considered as an appropriate anode material candidate for lithium ion batteries. Herein, a simple and scalable dry-production method is developed to produce carbon-encapsulated 3D net-like FeOx/C material. The process simply associates with pyrolysis of solid carbon source of filter paper with adsorbed ferrite nitrate. The carbon derived from filter paper induces a carbothermal reduction to form metallic Fe, the adding carbon and metal Fe increase the conductivity of this material...
August 14, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28803324/decreased-serum-l-arginine-and-l-citrulline-levels-in-major-depression
#3
S Hess, G Baker, G Gyenes, R Tsuyuki, S Newman, Jean-Michel Le Melledo
RATIONALE: It has been suggested that endothelial dysfunction caused by a decreased endothelial production of nitric oxide (NO) may contribute to the consistently observed increased risk of developing cardiovascular disease (CVD) in physically healthy patients suffering from major depression (MD). NO is a gas synthesized from Larginine (a conditionally essential amino acid) and oxygen by endothelial nitric oxide synthase (eNOS). The end products of NO production include both NO and L-citrulline...
August 13, 2017: Psychopharmacology
https://www.readbyqxmd.com/read/28802834/vegetable-derived-bioactive-nitrate-and-cardiovascular-health
#4
REVIEW
Catherine P Bondonno, Lauren C Blekkenhorst, Alex H Liu, Nicola P Bondonno, Natalie C Ward, Kevin D Croft, Jonathan M Hodgson
Vegetable derived nitrate is now recognised as an important bioactive phytochemical with cardioprotective properties. Nitrate, through the recently described enterosalivary nitrate-nitrite-nitric oxide (NO) pathway, increases NO, a molecule pivotal for cardiovascular health. Clinical trials have observed that dietary nitrate has similar effects to NO when supplied exogenously. These effects include reduced blood pressure and improvements in other markers of vascular health such as endothelial function, arterial stiffness, ischemia reperfusion injury, blood flow, and platelet aggregation...
August 9, 2017: Molecular Aspects of Medicine
https://www.readbyqxmd.com/read/28798125/microbiota-activated-ppar-%C3%AE-signaling-inhibits-dysbiotic-enterobacteriaceae-expansion
#5
Mariana X Byndloss, Erin E Olsan, Fabian Rivera-Chávez, Connor R Tiffany, Stephanie A Cevallos, Kristen L Lokken, Teresa P Torres, Austin J Byndloss, Franziska Faber, Yandong Gao, Yael Litvak, Christopher A Lopez, Gege Xu, Eleonora Napoli, Cecilia Giulivi, Renée M Tsolis, Alexander Revzin, Carlito B Lebrilla, Andreas J Bäumler
Perturbation of the gut-associated microbial community may underlie many human illnesses, but the mechanisms that maintain homeostasis are poorly understood. We found that the depletion of butyrate-producing microbes by antibiotic treatment reduced epithelial signaling through the intracellular butyrate sensor peroxisome proliferator-activated receptor γ (PPAR-γ). Nitrate levels increased in the colonic lumen because epithelial expression of Nos2, the gene encoding inducible nitric oxide synthase, was elevated in the absence of PPAR-γ signaling...
August 11, 2017: Science
https://www.readbyqxmd.com/read/28797835/tumor-necrosis-factor-%C3%AE-receptor-1-contributes-to-ethanol-induced-vascular-reactive-oxygen-species-generation-and-hypertension
#6
Janaina A Simplicio, Natália A Gonzaga, Marcelo A Nakashima, Bruno S De Martinis, Thiago M Cunha, Luis F Tirapelli, Carlos R Tirapelli
We evaluated the contribution of tumor necrosis factor-α receptor 1 (TNFR1) to ethanol-induced hypertension and vascular oxidative stress and the possible role of perivascular adipose tissue (PVAT) in such responses. Male C57BL/6 wild-type (WT) or TNFR1-deficient mice (TNFR1(-/-)) were treated with ethanol (20% vol/vol) for 12 weeks. Ethanol induced an increase in blood pressure in WT mice and TNFR1(-/-) at 4 and 5 weeks of treatment, respectively. Treatment with ethanol increased tumor necrosis factor-α and interleukin-6 levels in aortas with or without PVAT (PVAT+ and PVAT-, respectively) from WT mice, but not TNFR1(-/-)...
July 22, 2017: Journal of the American Society of Hypertension: JASH
https://www.readbyqxmd.com/read/28797210/removal-of-methyl-orange-by-heterogeneous-fenton-catalysts-prepared-using-glycerol-as-green-reducing-agent
#7
Natália S F Trotte, M Alzamora, D R Sánchez, Nakédia M F Carvalho
This study aims to prepare environmentally friendly iron catalysts supported on silica, using glycerol as green reducing and stabilizing agent, for application in heterogeneous Fenton degradation of the pollutant dye methyl orange. The catalysts were characterized by XRD, AAS, SEM, TEM, thermogravimetric analyses, Mössbauer and FTIR spectroscopies, which revealed the formation of iron(II)/(III) oxalates from the oxidation of glycerol by the iron(III) nitrate precursor. Besides, iron oxihydroxide nanoparticles with superparamagnetic behavior were also formed...
August 10, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28796517/computational-and-experimental-investigation-of-the-detection-of-ho2-radical-and-the-products-of-its-reaction-with-cyclohexene-ozonolysis-derived-ro2-radicals-by-an-iodide-based-chemical-ionization-mass-spectrometer
#8
Siddharth Iyer, Xucheng He, Noora Hyttinen, Theo Kurtén, Matti P Rissanen
The HO2 radical is an important atmospheric molecule that can potentially influence the termination of autoxidation processes of volatile organic compounds (VOCs) that lead to the formation of highly oxygenated multifunctional compounds (HOMs). In this work, we demonstrate the direct detection of the HO2 radical using an iodide-based chemical ionization mass spectrometer (iodide-CIMS). Expanding on the previously established correlation between molecule-iodide binding enthalpy and iodide-CIMS instrument sensitivity, the experimental detection of the HO2 radical was preceded by the quantum chemical calculation of the HO2*I(-) cluster (PBE/aug-cc-pVTZ-PP level), which showed a reasonably strong binding enthalpy of 21...
August 10, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28795583/regulation-of-cell-survival-apoptosis-and-epithelial-to-mesenchymal-transition-by-nitric-oxide-dependent-post-translational-modifications
#9
Raul González, Francisco J Molina-Ruiz, Jose Antonio Barcena Ruiz, C Alicia Padilla, Jordi Muntané
SIGNIFICANCE: Nitric oxide (NO) is a physiopathological messenger generating different reactive nitrogen species (RNS) according to hypoxic, acidic and redox conditions. Recent Advances: RNS and reactive oxygen species (ROS) promote relevant post-translational modifications, such as nitrosation, nitration and oxidation, in critical components of cell proliferation and death, epithelial to mesenchymal transition and metastasis. CRITICAL ISSUES: The pro- or antitumoral properties of NO are dependent on local concentration, redox state, cellular status, duration of exposure and compartmentalization of NO generation...
August 10, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/28792745/sequential-combination-of-electro-fenton-and-electrochemical-chlorination-processes-for-treatment-of-anaerobically-digested-food-wastewater
#10
Yong-Uk Shin, Ha-Young Yoo, Seonghun Kim, Kyung-Mi Chung, Yong-Gyun Park, Kwang-Hyun Hwang, Seokwon Hong, Hyunwoong Park, Kangwoo Cho, Jaesang Lee
A two-stage sequential electro-Fenton (E-Fenton) oxidation followed by electrochemical chlorination (EC) was demonstrated to concomitantly treat high concentrations of organic carbon and ammonium nitrogen (NH4+-N) in real anaerobically-digested food wastewater (ADFW). The anodic Fenton process caused the rapid mineralization of phenol as a model substrate through the production of hydroxyl radical as the main oxidant. The electrochemical oxidation of NH4+ by a dimensionally stable anode (DSA) resulted in temporal concentration profiles of combined and free chlorine species that were analogous to those during the conventional breakpoint chlorination of NH4+...
August 9, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28791036/ectopic-expression-of-pii-induces-stomatal-closure-in-lotus-japonicus
#11
Aurora Parlati, Vladimir T Valkov, Enrica D'Apuzzo, Ludovico M Alves, Angelo Petrozza, Stephan Summerer, Alex Costa, Francesco Cellini, Alain Vavasseur, Maurizio Chiurazzi
The PII protein in plants has been associated to many different tissue specialized roles concerning the Nitrogen assimilation pathways. We report here the further characterization of L. japonicus transgenic lines overexpressing the PII protein encoded by the LjGLB1 gene that is strongly expressed in the guard cells of Lotus plants. Consistently with a putative role played by PII in that specific cellular context we have observed an alteration of the patterns of stomatal movement in the overexpressing plants...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28790886/molecular-bases-of-brain-preconditioning
#12
Oleg G Deryagin, Svetlana A Gavrilova, Khalil L Gainutdinov, Anna V Golubeva, Vyatcheslav V Andrianov, Guzel G Yafarova, Sergey V Buravkov, Vladimir B Koshelev
Preconditioning of the brain induces tolerance to the damaging effects of ischemia and prevents cell death in ischemic penumbra. The development of this phenomenon is mediated by mitochondrial adenosine triphosphate-sensitive potassium ([Formula: see text]) channels and nitric oxide signaling (NO). The aim of this study was to investigate the dynamics of molecular changes in mitochondria after ischemic preconditioning (IP) and the effect of pharmacological preconditioning (PhP) with the [Formula: see text]-channels opener diazoxide on NO levels after ischemic stroke in rats...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28789663/inorganic-nitrate-as-a-treatment-for-acute-heart-failure-a-protocol-for-a-single-center-randomized-double-blind-placebo-controlled-pilot-and-feasibility-study
#13
Roman Falls, Michael Seman, Sabine Braat, Joshua Sortino, Jason D Allen, Christopher J Neil
BACKGROUND: Acute heart failure (AHF) is a frequent reason for hospitalization worldwide and effective treatment options are limited. It is known that AHF is a condition characterized by impaired vasorelaxation, together with reduced nitric oxide (NO) bioavailability, an endogenous vasodilatory compound. Supplementation of inorganic sodium nitrate (NaNO3) is an indirect dietary source of NO, through bioconversion. It is proposed that oral sodium nitrate will favorably affect levels of circulating NO precursors (nitrate and nitrite) in AHF patients, resulting in reduced systemic vascular resistance, without significant hypotension...
August 8, 2017: Journal of Translational Medicine
https://www.readbyqxmd.com/read/28783781/plastic-biofilm-carrier-after-corn-cobs-reduces-nitrate-loading-in-laboratory-denitrifying-bioreactors
#14
Gary W Feyereisen, Laura E Christianson, Thomas B Moorman, Rodney T Venterea, Jeffrey A Coulter
Nitrate-nitrogen (nitrate-N) removal rates can be increased substantially in denitrifying bioreactors with a corn ( L.) cob bed medium compared with woodchips; however, additional organic carbon (C) is released into the effluent. This laboratory column experiment was conducted to test the performance of a postbed chamber of inert plastic biofilm carrier (PBC) after corn cobs (CC) to extend the area of biofilm colonization, enhance nitrate-N removal, lower total organic C losses, and reduce nitrous oxide (NO) production at warm (15...
July 2017: Journal of Environmental Quality
https://www.readbyqxmd.com/read/28782795/mechanisms-of-nitrous-oxide-n2-o-formation-and-reduction-in-denitrifying-biofilms
#15
Fabrizio Sabba, Cristian Picioreanu, Robert Nerenberg
Nitrous oxide (N2 O) is a potent greenhouse gas that can be formed in wastewater treatment processes by ammonium oxidizing and denitrifying microorganisms. While N2 O emissions from suspended growth systems have been extensively studied, and some recent studies have addressed emissions from nitrifying biofilms, much less is known about N2 O emissions from denitrifying biofilm processes. This research used modeling to evaluate the mechanisms of N2 O formation and reduction in denitrifying biofilms. The kinetic model included formation and consumption of key denitrification species, including nitrate (NO3(-) ), nitrite (NO2(-) ), nitric oxide (NO), and N2 O...
August 7, 2017: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/28780336/facile-one-pot-synthesis-of-cerium-oxide-sulfur-doped-graphitic-carbon-nitride-g-c3n4-as-efficient-nanophotocatalysts-under-visible-light-irradiation
#16
Milad Jourshabani, Zahra Shariatinia, Alireza Badiei
Porous CeO2/sulfur-doped g-C3N4 (CeO2/CNS) composites were synthesized by one-pot thermal condensation of thiourea and cerium nitrate as starting materials. The obtained CeO2(x)/CNS composites (x=8.4, 9.5 and 10.4wt%) with different CeO2 contents were characterized by the XRD, FT-IR, XPS, TEM, BET, DRS and PL analyses. The TEM images displayed a nonporous and platelet-like morphology for pure CNS but a nanoporous structure with numerous uniform pore sizes of ∼40nm for the CeO2(9.5)/CNS composite. The XRD phase structures and TEM morphologies confirmed that structural evolution trend and stacking degree of CNS were disrupted in precense of the CeO2 nanoparticles...
July 29, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28777978/clovamide-and-clovamide-rich-extracts-of-three-trifolium-species-as-antioxidants-and-moderate-antiplatelet-agents-in-vitro
#17
Joanna Kolodziejczyk-Czepas, Justyna Krzyżanowska-Kowalczyk, Malgorzata Sieradzka, Pawel Nowak, Anna Stochmal
This in vitro study provides a new insight into the phytochemical, antioxidant, antiplatelet and cytotoxic profiles of commercial trans-clovamide and clovamide-rich extracts, isolated from aerial parts of three Trifolium species (i.e. T. clypeatum L., T. obscurum Savi and T. squarrosum L.). Under inorganic experimental conditions, the EC50 for the investigated substances varied between 4.87 (clovamide) and 7.91 μg/ml (T. clypeatum) according to the DPPH(•) assay. The most effective 1 mM ONOO(-) scavenger was clovamide (IC50 = 19...
August 1, 2017: Phytochemistry
https://www.readbyqxmd.com/read/28774961/identification-and-characterization-of-a-bacterial-cytochrome-p450-monooxygenase-catalyzing-the-3-nitration-of-tyrosine-in-rufomycin-biosynthesis
#18
Hiroya Tomita, Yohei Katsuyama, Hiromichi Minami, Yasuo Ohnishi
Rufomycin is a circular heptapeptide with anti-mycobacterial activity and is produced by Streptomyces atratus ATCC 14046. Its structure contains three non-proteinogenic amino acids, N-dimethylallyltryptophan, trans-2-crotylglycine, and 3-nitrotyrosine (3NTyr). Although the rufomycin structure was already reported in the 1960s, its biosynthesis, including 3-NTyr generation, remains unclear. To elucidate the rufomycin biosynthetic pathway, we assembled a draft genome sequence of S. atratus and identified the rufomycin biosynthetic gene cluster (ruf cluster), consisting of 20 ORFs (rufA-rufT)...
August 3, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28774858/a-comparative-intracellular-proteomic-profiling-of-pseudomonas-aeruginosa-strain-asp-53-grown-on-pyrene-or-glucose-as-sole-source-of-carbon-and-identification-of-some-key-enzymes-of-pyrene-biodegradation-pathway
#19
Ashis K Mukherjee, Pabitra Bhagowati, Bhim Bahadur Biswa, Abhishek Chanda, Bhargab Kalita
Pseudomonas aeruginosa strain ASP-53, isolated from a petroleum oil-contaminated soil sample, was found to be an efficient degrader of pyrene. PCR amplification of selected hydrocarbon catabolic genes (alkB gene, which encodes for monooxygenase, and the C12O, C23O, and PAH-RHDα genes encoding for the dioxygenase enzyme) from the genomic DNA of P. aeruginosa strain ASP-53 suggested its hydrocarbon degradation potential. The GC-MS analysis demonstrated 30.1% pyrene degradation by P. aeruginosa strain ASP-53 after 144h of incubation at pH6...
July 31, 2017: Journal of Proteomics
https://www.readbyqxmd.com/read/28774789/impaired-cbs-h2s-signaling-axis-contributes-to-mptp-induced-neurodegeneration-in-a-mouse-model-of-parkinson-s-disease
#20
Yu-Qing Yuan, Ya-Li Wang, Bao-Shi Yuan, Xin Yuan, Xiao-Ou Hou, Jin-Song Bian, Chun-Feng Liu, Li-Fang Hu
Hydrogen sulfide (H2S), a novel neuromodulator, is linked to the pathogenesis of several neurodegenerative disorders. Exogenous application of H2S exerts neuroprotection via anti-inflammation and anti-oxidative stress in animal and cellular models of Parkinson's disease (PD). However, the role of endogenous H2S and the contribution of its various synthases in PD remain unclear. In the present study, we found a decline of plasma and striatal sulfide level in 1-methy-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) induced PD mouse model...
August 1, 2017: Brain, Behavior, and Immunity
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