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https://www.readbyqxmd.com/read/29160074/stereoselective-and-catalytic-synthesis-of-anti-%C3%AE-alkoxy-%C3%AE-azido-carboxylic-derivatives
#1
Javier Fernández-Valparis, Pedro Romea, Fèlix Urpí, Mercè Font-Bardia
Direct addition of a chiral N-azidoacetyl thiazolidinethione to a variety of dialkyl acetals catalyzed by a commercially available and structurally simple nickel(II) complex gives access in good yields and a highly stereocontrolled manner to anti-β-alkoxy-α-azido carboxylic derivatives which, in turn, can be easily converted into a wide array of enantiomerically pure compounds.
November 21, 2017: Organic Letters
https://www.readbyqxmd.com/read/29159912/nickel-0-catalyzed-hydroarylation-of-styrenes-and-1-3-dienes-with-organoborons
#2
Qi-Lin Zhou, Li-Jun Xiao, Lei Cheng, Wei-Min Feng, Mao-Lin Li, Jian-Hua Xie
The Ni-catalyzed hydroarylation of styrenes and 1,3-dienes with organoborons has been developed. The reaction offers a highly selective approach to the diarylalkanes and allylarenes under redox-neutral condition. In this hydroarylation reaction, a new strategy that uses easily available proton of methanol to generate active catalyst species Ni-H was developed. The Ni-catalyzed hydroarylation, combining with a Ir-catalyzed C-H borylation, affords a very efficient and straightforward access to retinoic acid receptor agonist...
November 20, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/29158701/study-of-dna-damage-caused-by-dipyrone-in-presence-of-some-transition-metal-ions
#3
Bruna Corrêa Roriz, Horacio Dorigan Moya
The DNA damage in the presence of dipyrone (used as its sodium salt, NaDip) and some transition metal ions in an air saturated ([O2] ≈ 0.25 mM) non-buffered solution at T = (25.0 ± 0.5)°C was investigated by agarose gel electrophoresis. As metal ions Cu(2+), Fe(3+), Ni(2+) and Mn(3+) were selected and evaluated in the present study because of the important role they play in a biological system. pUC19 plasmid DNA damage-induced by NaDip (80-600 μM) was observed in the presence of 100 μM Cu(2+)...
November 2017: Saudi Pharmaceutical Journal: SPJ: the Official Publication of the Saudi Pharmaceutical Society
https://www.readbyqxmd.com/read/29158002/sofc-single-cells-fed-by-biogas-experimental-tests-with-trace-contaminants
#4
Davide Papurello, Andrea Lanzini
Biogas from biological treatments and from the waste degradation in landfills generally contains a wide range of trace impurities (e.g., sulphur compounds, siloxanes, halogens, tar compounds, etc.). This paper describes an experimental analysis performed with SOFC single cells fed by a synthetic gas polluted by H2S, HCl, D4 and a mixture of H2S + C2Cl4. The aim is to detect the threshold tolerance limit on different cell performance parameters. Results show how: hydrogen sulphide has a strong impact on the polarization losses due to the nickel sulphide formation on the electrode that causes a mass transfer resistance...
November 17, 2017: Waste Management
https://www.readbyqxmd.com/read/29157887/spatial-patterns-of-heavy-metal-accumulation-in-sediments-and-macrophytes-of-bellandur-wetland-bangalore
#5
T V Ramachandra, P B Sudarshan, M K Mahesh, S Vinay
Heavy metals are one among the toxic chemicals and accumulation in sediments and plants has been posing serious health impacts. Wetlands aid as kidneys of the landscape and help in remediation through uptake of nutrients, heavy metals and other contaminants. The analyses of macrophytes and sediment samples help in evaluating pollution status in aquatic environment. In this study concentration of six heavy metals (Cadmium (Cd), Chromium (Cr), Copper (Cu), Nickel (Ni), Lead (Pb) and Zinc (Zn)) were assessed in sediment and dominant macrophyte samples collected from Bellandur Lake, largest Lake of Bangalore, India...
November 17, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/29156303/assessment-of-nickel-bioavailability-through-chemical-extractants-and-red-clover-trifolium-pratense-l-in-an-amended-soil-related-changes-in-various-parameters-of-red-clover
#6
Ali Khan Shahbaz, Muhammad Iqbal, Abdul Jabbar, Sabir Hussain, Muhammad Ibrahim
Application of immobilizing agents may efficiently reduce the bioavailability of nickel (Ni) in the soil. Here we report the effect of biochar (BC), gravel sludge (GS) and zeolite (ZE) as a sole treatment and their combinations on the bioavailability of Ni after their application into a Ni-polluted soil. The bioavailability of Ni after the application of immobilizing agents was assessed through an indicator plant (red clover) and chemical indicators of bioavailability like soil water extract (SWE), DTPA and Ca(NO3)2 extracts...
November 17, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29155587/static-and-dynamic-electron-correlation-in-the-ligand-noninnocent-oxidation-of-nickel-dithiolates
#7
Anthony W Schlimgen, David A Mazziotti
Metal dithiolates have a wide range of applications from catalysis to molecular conductors with the ligands being the source of electrons during electrochemical oxidation in an effect known as ligand noninnocence. Recent large-scale variational two-electron reduced-density matrix (2-RDM) calculations of the vanadium oxo complex and manganese superoxide dismutase show that quantum entanglement stabilizes the addition of an electron to the ligands, providing a quantum mechanical explanation for ligand noninnocence...
November 20, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/29155551/the-template-assisted-wet-combustion-synthesis-of-fibrous-nickel-based-catalyst-for-carbon-dioxide-methanation-and-methane-steam-reforming
#8
Marina Aghayan, Dmitriy Potemkin, Fernando Rubio-Marcos, Sergey Uskov, P Snytnikov, Irina Hussainova
Efficient capture and recycling of CO2 enable not only preventing global warming but also to supplying useful low-carbon fuels. The catalytic conversion of CO2 into organic compound is a promising recycling approach which opens new concepts and opportunities for catalytic and industrial development. Here we report about template-assisted wet-combustion synthesis of one-dimensional nickel-based catalyst for carbon dioxide methanation and methane steam reforming. Due to a high temperature achieved in a short time during reaction and a large amount of gases evolved, the wet-combustion synthesis yields homogeneously precipitated nanoparticles of NiO with average particle size of 4 nm on alumina nanofibers covered with NiAl2O4 nano-layer...
November 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29155467/synthesis-characterisation-and-reactions-of-truly-cationic-ni-i-phosphine-complexes
#9
Ingo Krossing, Miriam Mareen Schwab, Daniel Himmel, Sylwia Kacprzak, Valentin Radtke, Daniel Kratzert, Philippe Weis, Melanie Wernet, Andreas Peter, Zeinab Yassine, Dominik Schmitz, Ernst-Wilhelm Scheidt, Wolfgang Scherer, Stefan Weber, Wolfram Feuerstein, Frank Breher, Alexander Higelin
The recently published purely metalorganic NiI salt [Ni(cod)2][Al(ORF)4] (1, cod = 1,5-cyclooctadiene, RF = C(CF3)3) provides a starting point for a new synthesis strategy leading to NiI phosphine complexes, replacing cod ligands by phosphines. Clearly visible colour changes indicate reactions within minutes, while quantum chemical calculations (PBE0-D3(BJ)/def2-TZVPP) approve exergonic reaction enthalpies in all performed ligand exchange reactions. Hence, [Ni(dppp)2][Al(ORF)4] (2, dppp = 1,3-Bis(diphenylphosphino)propane), [Ni(dppe)2][Al(ORF)4] (3, dppe = 1,3-Bis(diphenyl-phosphino)ethane), three-coordinate [Ni(PPh3)3][Al(ORF)4] (4) and a remarkable two-coordinate NiI phosphine complex [Ni(PtBu3)2][Al(ORF)4] (5) were characterised via single crystal X-ray structure analysis...
November 20, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29155461/nanoscale-trimetallic-metal-organic-frameworks-enable-efficient-oxygen-evolution-electrocatalysis
#10
Xiaoqing Huang
Metal-organic frameworks (MOFs) are a class of promising materials for diverse catalysis, but they are usually not directly employed for oxygen evolution electrocatalysis. Most reports focus on using MOFs as templates to in-situ create efficient electrocatalysts via annealing. Herein, we prepared a series of Fe/Ni/-based trimetallic MOFs (Fe/Ni/Co(Mn)-Material of Institute Lavoisier (MIL-53)) by solvothermal synthesis, which can be directly adopted as electrocatalysts. It was revealed that the Fe/Ni/Co(Mn)-MIL-53 exhibited volcano-type oxygen evolution reaction (OER) activity as a function of compositions...
November 20, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/29154961/inhibition-of-cyclooxygenase-cox-2-suppresses-the-recruitment-of-endothelial-progenitor-cells-in-the-microvasculature-of-endometriotic-lesions
#11
Jeannette Rudzitis-Auth, Ruth M Nickels, Michael D Menger, Matthias W Laschke
The incorporation of endothelial progenitor cells (EPCs) into newly developing blood vessels contributes to the vascularization of endometriotic lesions. here, we analyzed whether cyclooxygenase (COX)-2 signaling regulates this vasculogenic process. Endometriotic lesions were surgically induced in irradiated FVB/N mice, which were reconstituted with bone marrow from FVB/N-TgN (Tie2/green fluorescent protein (GFP)) 287 Sato mice. The animals received β-estradiol 17-valerate once a week and were daily treated with the selective COX-2 inhibitor parecoxib (25 mg/kg) or vehicle (control) over 7 and 28 days...
November 15, 2017: American Journal of Pathology
https://www.readbyqxmd.com/read/29154198/evaluation-of-antioxidant-dna-targeting-antimicrobial-and-cytotoxic-studies-of-imine-capped-copper-and-nickel-nanoparticles
#12
P Adwin Jose, J Dhaveethu Raja, M Sankarganesh, J Rajesh
In this work, we have synthesized pyrimidine derivatives of Schiff base ligand 2-(4,6-dimethoxypyrimidin-2-ylimino)methyl)-6-methoxyphenol (DPMM) stabilized copper nanoparticles (DPMM-CuNPs) and nickel nanoparticles (DPMM-NiNPs) by modified Brust-Schiffrin technique as two step phase transfer assisted method and confirmed by UV-Visible, SEM and TEM analysis. The free radical scavenging activity of DPMM, DPMM-CuNPs &DPMM-NiNPs with 2, 2'-diphenylpicryl hydrazyl (DPPH), hydrogen peroxide (H2O2) super oxide dismutase (SOD) and nitric oxide (NO) shows that the antioxidant activity of DPMM-CuNPs is higher than DPMM &DPMM-NiNPs...
November 6, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29153748/marginal-discrepancy-of-noble-metal-ceramic-fixed-dental-prosthesis-frameworks-fabricated-by-conventional-and-digital-technologies
#13
Ahmed Afify, Stephan Haney, Ronald Verrett, Michael Mansueto, James Cray, Russell Johnson
STATEMENT OF PROBLEM: Studies evaluating the marginal adaptation of available computer-aided design and computer-aided manufacturing (CAD-CAM) noble alloys for metal-ceramic prostheses are lacking. PURPOSE: The purpose of this in vitro study was to evaluate the vertical marginal adaptation of cast, milled, and direct metal laser sintered (DMLS) noble metal-ceramic 3-unit fixed partial denture (FDP) frameworks before and after fit adjustments. MATERIAL AND METHODS: Two typodont teeth were prepared for metal-ceramic FDP abutments...
November 15, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29153425/fluoroethoxy-1-4-diphenethylpiperidine-and-piperazine-derivatives-potent-and-selective-inhibitors-of-3-h-dopamine-uptake-at-the-vesicular-monoamine-transporter-2
#14
Emily R Hankosky, Shyam R Joolakanti, Justin R Nickell, Venumadhav Janganati, Linda P Dwoskin, Peter A Crooks
A small library of fluoroethoxy-1,4-diphenethyl piperidine and fluoroethoxy-1,4-diphenethyl piperazine derivatives were designed, synthesized and evaluated for their ability to inhibit [(3)H]dopamine (DA) uptake at the vesicular monoamine transporter-2 (VMAT2) and dopamine transporter (DAT), [(3)H]serotonin (5-HT) uptake at the serotonin transporter (SERT), and [(3)H]dofetilide binding at the human-ether-a-go-go-related gene (hERG) channel. The majority of the compounds exhibited potent inhibition of [(3)H]DA uptake at VMAT2, Ki changes in the nanomolar range (Ki = 0...
October 20, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/29153282/efficacy-of-elastic-memory-chains-versus-nickel-titanium-coil-springs-in-canine-retraction-a-two-center-split-mouth-randomized-clinical-trial
#15
Mashallah Khanemasjedi, Mehrnaz Moradinejad, Pedram Javidi, Ozra Niknam, Nima Haghighat Jahromi, Vahid Rakhshan
OBJECTIVE: The use of newly-introduced elastic memory chains (EMCs) in space closure is increasingly gaining popularity. However, no clinical studies have evaluated their efficacy. Therefore, this study was conducted. METHODS: In this two-center split-mouth single-blind randomized controlled trial, 21 jaws were divided into 42 quadrants. The two treatments [canine retraction using EMCs versus nickel-titanium (NiTi) coil springs (as control)] were randomly assigned to two quadrants of each jaw...
November 15, 2017: International Orthodontics
https://www.readbyqxmd.com/read/29152826/synthesis-and-reactivity-of-nickel-stabilised-%C3%A2%C2%B52-%C3%AE-2-%C3%AE-2-p2-as2-and-pas-units
#16
Gabriele Hierlmeier, Alexander Hinz, Robert Wolf, Jose Manuel Goicoechea
The reactivity of two paramagnetic nickel(I) compounds, CpNi(NHC) (where Cp = cyclopentadienyl; NHC = 1,3-bis(2,4,6-trimethylphenyl)-imidazol-2-ylidene (IMes) or 1,3-bis(2,6-diisopropylphenyl)-imidazol-2-ylidene (IPr)), towards [Na(dioxane)x][PnCO] (Pn = P, As) is described. These reactions afford symmetric bimetallic compounds (µ2:η2,η2-Pn2){Ni(NHC)(CO)}2. Several novel intermediates en route to such species are identified and characterised, including a compound containing the PCO- anion in an unprecedented µ2:η2,η2-binding mode...
November 20, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/29152795/influence-of-radiation-on-the-properties-and-the-stability-of-hybrid-perovskites
#17
REVIEW
Felix Lang, Oleksandra Shargaieva, Viktor V Brus, Heinz C Neitzert, Jörg Rappich, Norbert H Nickel
Organic-inorganic perovskites are well suited for optoelectronic applications. In particular, perovskite single and perovskite tandem solar cells with silicon are close to their market entry. Despite their swift rise in efficiency to more than 21%, solar cell lifetimes are way below the needed 25 years. In fact, comparison of the time when the device performance has degraded to 80% of its initial value (T80 lifetime) of numerous solar cells throughout the literature reveals a strongly reduced stability under illumination...
November 20, 2017: Advanced Materials
https://www.readbyqxmd.com/read/29152629/nanocrystalline-laox-nio-composite-as-high-performance-electrodes-for-supercapacitors
#18
Guo Du, Zifan Zeng, Bangqing Xiao, Dengzhi Wang, Yuan Yuan, Xiaohong Zhu, Jiliang Zhu
Nanocrystalline LaOx/NiO composite electrodes were synthesized via two types of facile cathodic electrodeposition methods onto nickel foam followed by thermal annealing without any binders. Scanning electron microscopy and transmission electron microscopy investigation revealed that LaOx nanocrystalline particles with an average diameter of 50 nm are uniformly distributed in the NiO layer or alternately deposited with the NiO layer onto the substrate. It is speculated that LaOx particles can participate in the faradaic reaction directly and offer more redox sites...
November 20, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29152091/fibroblast-growth-factor-2-mediated-protection-of-cardiomyocytes-from-the-toxic-effects-of-doxorubicin-requires-the-mtor-nrf-2-ho-1-pathway
#19
Navid Koleini, Barbara E Nickel, Jie Wang, Zeinab Roveimiab, Robert R Fandrich, Lorrie A Kirshenbaum, Peter A Cattini, Elissavet Kardami
Background: Cardiotoxic side effects impose limits to the use of anti-tumour chemotherapeutic drugs such as doxorubicin (Dox). There is a need for cardioprotective strategies to prevent the multiple deleterious effects of Dox. Here, we examined the ability of administered fibroblast growth factor-2 (FGF-2), a cardioprotective protein that is synthesized as high and low molecular weight (Hi-, Lo-FGF-2) isoforms, to prevent Dox-induced: oxidative stress; cell death; lysosome dysregulation; and inactivation of potent endogenous protective pathways, such as the anti-oxidant/detoxification nuclear factor erythroid-2-related factor (Nrf-2), heme oxygenase-1 (HO-1) axis...
October 20, 2017: Oncotarget
https://www.readbyqxmd.com/read/29150881/genotoxicity-of-11-heavy-metals-detected-as-food-contaminants-in-two-human-cell-lines
#20
B Kopp, D Zalko, M Audebert
Heavy metals, such as arsenic (As), antimony (Sb), barium (Ba), cadmium (Cd), cobalt (Co), germanium (Ge), lead (Pb), nickel (Ni), tellurium (Te), and vanadium (V) are widely distributed in the environment and in the food chain. Human exposure to heavy metals through water and food has been reported by different international agencies. Although some of these heavy metals are essential elements for human growth and development, they may also be toxic at low concentrations due to indirect mechanisms. In this study, the genotoxic and cytotoxic properties of 15 different oxidation statuses of 11 different heavy metals were investigated using high-throughput screening (γH2AX assay) in two human cell lines (HepG2 and LS-174T) representative of target organs (liver and colon) for food contaminants...
November 18, 2017: Environmental and Molecular Mutagenesis
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