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https://www.readbyqxmd.com/read/28718470/co2-activation-and-dissociation-on-the-low-miller-index-surfaces-of-pure-and-ni-coated-iron-metal-a-dft-study
#1
Caroline R Kwawu, Richard Tia, Evans Adei, Nelson Y Dzade, C Richard A Catlow, Nora H de Leeuw
We have used spin polarized density functional theory calculations to perform extensive mechanistic studies of CO2 dissociation into CO and O on the clean Fe(100), (110) and (111) surfaces and on the same surfaces coated by a monolayer of nickel. CO2 chemisorbs on all three bare facets and binds more strongly to the stepped (111) surface than on the open flat (100) and close-packed (110) surfaces, with adsorption energies of -88.7 kJ mol(-1), -70.8 kJ mol(-1) and -116.8 kJ mol(-1) on the (100), (110) and (111) facets, respectively...
July 18, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28718291/porous-structured-ni-fe-p-nanocubes-derived-from-prussian-blue-analogue-as-electrocatalyst-for-efficient-overall-water-splitting
#2
Cuijuan Xuan, Jie Wang, Weiwei Xia, Zongkai Peng, Zexing Wu, Wen Lei, Kedong Xia, Huolin L Xin, Deli Wang
Exploring non-precious metal electrocatalysts to replace the noble metal based catalysts for full water electrocatalysis is still an ongoing challenge. In this work, porous structured ternary nickel-iron-phosphides (Ni-Fe-P) nanocubes were synthesized through one-step phosphidation of Ni-Fe based Prussian blue analogue. The Ni-Fe-P nanocubes exhibit rough and loose porous structure on the surface under suitable phosphating temperature, which is favorable for the mass transfer and oxygen diffusion during electrocatalysis process...
July 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28717954/evaluation-of-40-diazinon-impregnated-ear-tag-patriot%C3%A2-for-controlling-horn-flies-and-face-flies-among-cow-calf-pairs-in-the-united-states
#3
Chandra Bhushan, Jason Nickell, Dan Goehl, Brad White, Miles Theurer
No abstract text is available yet for this article.
July 17, 2017: Parasitology Research
https://www.readbyqxmd.com/read/28716760/properties-of-purified-cyp2r1-in-a-reconstituted-membrane-environment-and-its-25-hydroxylation-of-20-hydroxyvitamin-d3
#4
Chloe Y S Cheng, Tae-Kang Kim, Saowanee Jeayeng, Andrzej T Slominski, Robert C Tuckey
Recent studies indicate that CYP2R1 is the major 25-hydroxylase catalyzing the first step in vitamin D activation. Since the catalytic properties of CYP2R1 have been poorly studied to date and it is a membrane protein, we examined the purified enzyme in a membrane environment. CYP2R1 was expressed in E. coli and purified by nickel affinity- and hydrophobic interaction-chromatography and assayed in a reconstituted membrane system comprising phospholipid vesicles plus purified human NADPH-P450 oxidoreductase...
July 14, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28716727/systematic-review-and-meta-analysis-links-autism-and-toxic-metals-and-highlights-the-impact-of-country-development-status-higher-blood-and-erythrocyte-levels-for-mercury-and-lead-and-higher-hair-antimony-cadmium-lead-and-mercury
#5
REVIEW
Amene Saghazadeh, Nima Rezaei
BACKGROUND: Autism spectrum disorder (ASD) is a heterogeneous neurodevelopmental disorder that affects cognitive and higher cognitive functions. Increasing prevalence of ASD and high rates of related comorbidities has caused serious health loss and placed an onerous burden on the supporting families, caregivers, and health care services. Heavy metals are among environmental factors that may contribute to ASD. However, due to inconsistencies across studies, it is still hard to explain the association between ASD and toxic metals...
July 14, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/28715151/nickel-catalyzed-intermolecular-carbosulfonylation-of-alkynes-via-sulfonyl-radicals
#6
Andrés García-Domínguez, Simona Müller, Cristina Nevado
β,β-Disubstituted vinyl sulfones were obtained with complete regio- and stereocontrol in a multicomponent reaction involving alkynes, organoboronic acids, and sulfonyl chlorides in the presence of a nickel catalyst. The reaction proceeds via sulfonyl radicals generated in situ under mild reaction conditions.
July 17, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28714908/%C3%AE-etal-uptake-by-sunflower-helianthus-annuus-irrigated-with-water-polluted-with-chromium-and-nickel
#7
Vasiliki Stoikou, Vangelis Andrianos, Sotiris Stasinos, Marios G Kostakis, Sofia Attiti, Nikolaos S Thomaidis, Ioannis Zabetakis
The water aquifers of the regions of Asopos River in Viotia and Messapia in Evia (Greece) have been contaminated with hexavalent chromium (Cr (VI)) and bivalent nickel (Ni (II)). Given that these areas are the two biggest tuber producing regions of Greece, in our previous work, the cross-contamination of the food chain with these two heavy metals was quantified. In the present study, the potential of sunflower (Helianthus annuus) cultivation in these regions is evaluated. The scope of our study was to investigate the uptake of chromium and nickel by sunflower, in a greenhouse experiment...
July 17, 2017: Foods (Basel, Switzerland)
https://www.readbyqxmd.com/read/28714664/iron-doped-nickel-phosphide-nanosheet-arrays-an-efficient-bifunctional-electrocatalyst-for-water-splitting
#8
Pengyan Wang, Zonghua Pu, Yanhui Li, Lin Wu, Zhengkai Tu, Min Jiang, Zongkui Kou, Ibrahim Saana Amiinu, Shichun Mu
Exploring efficient and earth-abundant electrocatalysts for water splitting is crucial for various renewable energy technologies. In this work, iron (Fe)-doped nickel phosphide (Ni2P) nanosheet arrays supported on nickel foam (Ni1.85Fe0.15P NSAs/NF) are fabricated through a facile hydrothermal method followed by phosphorization. The electrochemical analysis demonstrates that the Ni1.85Fe0.15P NSAs/NF electrode possesses high electrocatalytic activity for water splitting. In 1.0 M KOH, the Ni1.85Fe0.15P NSAs/NF electrode only needs overpotentials of 106 mV at 10 mA cm-2 and 270 mV at 20 mA cm-2 to drive hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), respectively...
July 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28713644/kinetic-modeling-of-the-nickel-catalyzed-esterification-of-amides
#9
Nicholas A Weires, Daniel D Caspi, Neil K Garg
Nickel-catalyzed coupling reactions provide exciting tools in chemical synthesis. However, most methodologies in this area require high catalyst loadings, which commonly range from 10-20 mol % nickel. Through an academic-industrial collaboration, we demonstrate that kinetic modeling can be used strategically to overcome this problem, specifically within the context of the Ni-catalyzed conversion of amides to esters. The successful application of this methodology to a multigram-scale coupling, using only 0...
July 7, 2017: ACS Catalysis
https://www.readbyqxmd.com/read/28712078/effects-based-spatial-assessment-of-contaminated-estuarine-sediments-from-bear-creek-baltimore-harbor-md-usa
#10
Sharon E Hartzell, Michael A Unger, Beth L McGee, Lance T Yonkos
Estuarine sediments in regions with prolonged histories of industrial activity are often laden to significant depths with complex contaminant mixtures, including trace metals and persistent organic pollutants. Given the complexity of assessing risks from multi-contaminant exposures, the direct measurement of impacts to biological receptors is central to characterizing contaminated sediment sites. Though biological consequences are less commonly assessed at depth, laboratory-based toxicity testing of subsurface sediments can be used to delineate the scope of contamination at impacted sites...
July 15, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28712076/nickel-stressed-responses-of-rice-in-ni-subcellular-distribution-antioxidant-production-and-osmolyte-accumulation
#11
Muhammad Rizwan, Muhammad Imtiaz, Zhihua Dai, Sajid Mehmood, Muhammad Adeel, Jinchang Liu, Shuxin Tu
Nickel has been found a key pollutant in farmlands of central and south China, and understanding of Ni toxicity in rice is of great significance in safety production of rice and remediation of Ni polluted paddy soils. The present study aimed to investigate the uptake and subcellular distribution of Ni, antioxidant production, and osmolyte accumulation of rice (Oryza sativa L., cv. yangliangyou 6) plants exposed to excessive Ni concentrations to gain an insight into Ni-induced phytotoxicity. Results revealed that exposure of rice seedlings to high Ni concentrations resulted a decline in root and shoot lengths and fresh weight (FW) and dry weight (DW) of rice plants, which are in connection with the depletion of the contents of photosynthetic pigments...
July 15, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28711835/synergistic-green-extraction-of-nickel-ions-from-electroplating-waste-via-mixtures-of-chelating-and-organophosphorus-carrier
#12
Raja Norimie Raja Sulaiman, Norasikin Othman
The discharge of electroplating waste containing nickel ions has led to environmental issues owing to the toxicity problem mainly to the aquatic organisms and humans. Liquid-liquid extraction offers a great potential treatment for nickel removal with several advantages of simple, high efficiency and high separation factor. In this study, a green synergistic liquid-liquid extraction of nickel ions from electroplating waste solution using chelating oxime (LIX63) and organophosphorus (D2EHPA) carriers individually as well as their synergistic mixture has been studied...
June 27, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28711828/thioglycolate-based-task-specific-ionic-liquids-metal-extraction-abilities-vs-acute-algal-toxicity
#13
Sonja Platzer, Raphlin Leyma, Sara Wolske, Wolfgang Kandioller, Esther Heid, Christian Schröder, Michael Schagerl, Regina Krachler, Franz Jirsa, Bernhard K Keppler
We studied the extraction behavior of two thioglycolate-based ionic liquids (ILs), for heavy metals from aqueous solutions; substances of interest were methyltrioctylammonium S-hexyl thioglycolate [N1888][C6SAc] and methyltrioctylphosphonium S-hexyl thioglycolate [P1888][C6SAc]. Theses ILs previously have shown very good extraction abilities towards cadmium and copper, therefore we investigated time-dependent metal removal experiments with aqueous solutions of cobalt(II), nickel(II) and zinc(II). The highest distribution ratio (RIL/Water) was determined for zinc (RIL/Water=2000)...
June 23, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28711298/synthesis-and-characterization-of-slow-pyrolysis-pine-cone-bio-char-in-the-removal-of-organic-and-inorganic-pollutants-from-aqueous-solution-by-adsorption-kinetic-equilibrium-mechanism-and-thermodynamic
#14
Sara Dawood, Tushar Kanti Sen, Chi Phan
Pine cone bio-char was synthesized through slow pyrolysis at 500°C, characterized and used as an effective adsorbent in the removal of organic Methylene Blue (MB) dye and inorganic nickel metal (Ni(II) ions from aqueous phase. Batch adsorption kinetic study was carried out by varying solution pH, dye concentration, temperature, adsorbent dose and contact time. Kinetic and isotherm models indicates that the adsorption of both adsorbates onto pine cone bio-char were mainly by chemisorption. Langmuir maximum adsorption capability was found to be 106...
July 8, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28710875/a-review-on-bimetallic-ni-based-catalysts-for-co2-reforming-of-methane
#15
Zhoufeng Bian, Sonali Das, Ming Hui Wai, Plaifa Hongmanorom, Sibudjing Kawi
In recent years, CO2 reforming of methane (DRM) has become an attractive research area since it converts two major greenhouse gases into syngas (CO and H2) which can be directly used as fuel or feedstock for the chemical industry. Ni-based catalysts have been extensively used for DRM due to its low cost and good activity. A major concern with Ni based catalysts in DRM is the severe carbon deposition leading to catalyst deactivation, and a lot of efforts have been put to design and synthesize stable Ni catalysts with high carbon resistance...
July 15, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28710280/the-assembly-of-the-plant-urease-activation-complex-and-the-essential-role-of-the-urease-accessory-protein-g-ureg-in-delivery-of-nickel-to-urease
#16
Till Myrach, Anting Zhu, Claus-Peter Witte
Urease is a ubiquitous nickel metalloenzyme. In plants, its activation requires three urease accessory proteins (UAPs), UreD, UreF, and UreG. In bacteria, the UAPs interact with urease and facilitate activation, which involves the channeling of two nickel ions into the active site. So far this process has not been investigated in eukaryotes. Using affinity pull-downs of Strep-tagged UAPs from Arabidopsis and rice transiently expressed in planta, we demonstrate that a urease:UreD:UreF:UreG complex exists in plants and show its stepwise assembly...
July 14, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28709074/increased-methane-production-in-cyanobacteria-and-methanogenic-microbe-co-cultures
#17
Tracey Yeung, Matthew Kwan, Lewis Adler, Toby J Mills, Brett A Neilan, Gavin Conibeer, Robert Patterson
A novel light-to-bioenergy system produced 3.5 times the baseline methane output using a co-culture of cyanobacteria (Oscillatoria sp.) and a methanogenic microbial community. Analysis of micronutrients in the system during the growth phase indicated that cobalt, iron, nickel and zinc were not appreciably consumed. The stable consumption and return of macronutrients calcium and magnesium were also observed. Essential macronutrients nitrogen, in the form of nitrate, and phosphorus showed no cycling during the growth phase and were depleted at rates of 0...
June 24, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28709039/agricultural-management-of-an-oxisol-affects-accumulation-of-heavy-metals
#18
Guilherme Deomedesse Minari, David Luciano Rosalen, Mara Cristina Pessôa da Cruz, Wanderley José de Melo, Lucia Maria Carareto Alves, Luciana Maria Saran
Soil contamination may result from the inadequate disposal of substances with polluting potential or prolonged agricultural use. Therefore, cadmium (Cd), chromium (Cr) and nickel (Ni) concentrations were assessed in a Eutroferric Red Oxisol under a no-tillage farming system with mineral fertilizer applications, a conventional tillage system with mineral fertilizer application and a conventional tillage system with sewage sludge application in an area used for agriculture for more than 80 years. We evaluated the spatial distributions of these elements in the experimental area and the effect of the different management practices on the soil retention of these metals...
July 3, 2017: Chemosphere
https://www.readbyqxmd.com/read/28708627/nickel-adsorption-onto-polyurethane-ethylene-and-vinyl-acetate-sorbents
#19
Munawar Iqbal, Zahid Ali, M Afzal Qamar, Abid Ali, Fida Hussain, Mazhar Abbas, Jan Nisar
The present study was conducted to appraise the efficiencies of polyurethane ethylene sorbent (PES) and vinyl acetate sorbent (VAS) for nickel (Ni) adsorption. Process variables, i.e. Ni(II) ions initial concentration, pH, contact time and adsorbent dosage were optimized by response surface methodology (RSM) approach. The Ni(II) adsorption was fitted to the kinetic models (pseudo-first-order and pseudo-second-order) and adsorption isotherms (Freundlich and Langmuir). At optimum conditions of process variables, 171...
July 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28708388/nickel-catalyzed-alkene-carboacylation-via-activation-of-amide-c-n-bonds
#20
James A Walker, Kevin L Vickerman, Jenna N Humke, Levi M Stanley
We report nickel-catalyzed formal carboacylation of ortho-allylbenzamides with arylboronic acid pinacol esters. These carboacylation reactions are triggered by the oxidative addition of an activated amide C-N bond to a nickel(0) catalyst and proceed via alkene insertion into a nickel(II)-acyl bond. The exo-selective carboacylation reactions generate 2-benzyl-2,3-dihydro-1H-inden-1-ones in moderate-to-high yields (46-99%) from a variety of arylboronic acid pinacol esters and substituted ortho-allylbenzamides...
July 14, 2017: Journal of the American Chemical Society
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