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Christopher Paolucci, Ishant Khurana, Atish A Parekh, Sichi Li, Arthur J Shih, Hui Li, John R Di Iorio, Jonatan D Albarracin-Caballero, Aleksey Yezerets, Jeffrey T Miller, W Nicholas Delgass, Fabio H Ribeiro, William F Schneider, Rajamani Gounder
Copper ions exchanged into zeolites are active for the selective catalytic reduction (SCR) of NO x with NH3, but the low-temperature rate dependence on Cu volumetric density is inconsistent with reaction at single sites. We combine steady-state and transient kinetic measurements, x-ray absorption spectroscopy, and first-principles calculations to demonstrate that under reaction conditions, mobilized Cu ions can travel through zeolite windows and form transient ion pairs that participate in an O2-mediated Cu(I) → Cu(II) redox step integral to SCR...
August 17, 2017: Science
Zhe Li, Yumei Liu, Xia Li, Wen Ju, Guanrui Wu, Xiaomei Yang, Xiaofeng Fu, Xibao Gao
The purpose of this study is to explore more trace elements (zinc, potassium, copper, iron, boron, manganese, selenium, chromium and cadmium elements) in addition to calcium, magnesium, lead and arsenic in the sera of patients with schizophrenia and the general population in China and to determine the effect of selenium on schizophrenia patients. Participants were collected from the Pingyin County Mental Health Hospital and Pingyin County. A t test was used to analyse the differences between schizophrenia patients and healthy subjects, and element content differences in gender...
August 15, 2017: Biological Trace Element Research
V R Shaginyan, V A Stephanovich, A Z Msezane, G S Japaridze, K G Popov
We show that a quantum phase transition, generating flat bands and altering Fermi surface topology, is a primary reason for the exotic behavior of the overdoped high-temperature superconductors represented by La2-xSrxCuO4, whose superconductivity features differ from what is predicted by the classical Bardeen-Cooper-Schrieffer theory. This observation can open avenues for chemical preparation of high-Tc materials. We demonstrate that (1) at temperature T = 0, the superfluid density ns turns out to be considerably smaller than the total electron density; (2) the critical temperature Tc is controlled by ns rather than by doping, and is a linear function of the ns; (3) at T > Tc the resistivity ρ(T) varies linearly with temperature, ρ(T) ∝ αT, where α diminishes with Tc → 0, whereas in the normal (non superconducting) region induced by overdoping, Tc = 0, and ρ(T) ∝ T(2)...
August 14, 2017: Physical Chemistry Chemical Physics: PCCP
M Ordak, E Bulska, K Jablonka-Salach, A Luciuk, M Maj-Żurawska, H Matsumoto, T Nasierowski, M Wojnar, J Matras, E Muszynska, M Bujalska-Zadrozny
The concentrations of copper and zinc in the tissues of alcohol-addicted people can significantly correlate with the variables describing their mental state. Studies on the homeostasis of zinc in alcohol-dependent patients have often been characterized by low hypozincemia detection. This may be caused by a low content of zinc in blood serum (1%) compared to the average zinc level in the body. Unfortunately, most authors have identified extracellular zinc in their studies. In the available literature, data on the level of copper in patients suffering from alcohol dependence are inconsistent...
August 12, 2017: Biological Trace Element Research
R B Lages, E C Bridi, C A Pérez, R T Basting
No abstract text is available yet for this article.
August 8, 2017: Journal of Trace Elements in Medicine and Biology
Mirosław Mleczek, Piotr Goliński, Magdalena Krzesłowska, Monika Gąsecka, Zuzanna Magdziak, Paweł Rutkowski, Sylwia Budzyńska, Bogusława Waliszewska, Tomisław Kozubik, Zbigniew Karolewski, Przemysław Niedzielski
The aim of the study was to compare the phytoextraction abilities of six tree species (Acer platanoides L., Acer pseudoplatanus L., Betula pendula Roth, Quercus robur L., Tilia cordata Miller, Ulmus laevis Pall.), cultivated on mining sludge contaminated with arsenic (As), cadmium (Cd), copper (Cu), lead (Pb), thallium (Tl), and zinc (Zn). All six tree species were able to survive on such an unpromising substrate. However, A. platanoides and T. cordata seedlings grown on the polluted substrate showed significantly lower biomass than control plants (55...
August 9, 2017: Environmental Science and Pollution Research International
F Ronning, T Helm, K R Shirer, M D Bachmann, L Balicas, M K Chan, B J Ramshaw, R D McDonald, F F Balakirev, M Jaime, E D Bauer, P J W Moll
Electronic nematic materials are characterized by a lowered symmetry of the electronic system compared to the underlying lattice, in analogy to the directional alignment without translational order in nematic liquid crystals. Such nematic phases appear in the copper- and iron-based high-temperature superconductors, and their role in establishing superconductivity remains an open question. Nematicity may take an active part, cooperating or competing with superconductivity, or may appear accidentally in such systems...
August 7, 2017: Nature
Bohee Kim, Donghyun Jeong, Jaeheung Cho
Copper(ii)-alkylperoxo adducts, [Cu(CHDAP)(OOR)](+) (CHDAP = N,N'-dicyclohexyl-2,11-diaza[3,3](2,6)pyridinophane; R = C(CH3)2Ph and (t)Bu), were prepared and characterized using various physicochemical methods. These are the first synthetic Cu(ii)-alkylperoxo complexes that can perform aldehyde deformylation (i.e., nucleophilic reactivity) under the stoichiometric reaction conditions, which was confirmed by kinetic studies.
August 17, 2017: Chemical Communications: Chem Comm
Rui Li, Junlin Li, Lulu Cui, Yu Wu, Hongbo Fu, Jianmin Chen, Mindong Chen
China has become the largest coal consumer and important emitter of trace metals in the world. A multiple-year inventory of atmospheric copper (Cu) and zinc (Zn) emissions from coal combustion in 30 provinces of China and 4 economic sectors (power plant, industry sector, residential sector, and others) for the period of 1995-2014 has been calculated. The results indicated that the total emissions of Cu and Zn increased from 5137.70 t and 11484.16 t in 1995-7099.24 t and 14536.61 t in 2014, at an annual average growth rate of 1...
August 3, 2017: Environmental Pollution
Camila Prado Cenciani de Souza, Cleide Aparecida de Abreu, Aline Renée Coscione, Cristiano Alberto de Andrade, Luiz Antonio Junqueira Teixeira, Flavia Consolini
Rapid, accurate, and low-cost alternative analytical methods for micronutrient quantification in fertilizers are fundamental in QC. The purpose of this study was to evaluate whether zinc (Zn) and copper (Cu) content in mineral fertilizers and industrial by-products determined by the alternative methods USEPA 3051a, 10% HCl, and 10% H₂SO₄ are statistically equivalent to the standard method, consisting of hot-plate digestion using concentrated HCl. The commercially marketed Zn and Cu sources in Brazil consisted of oxides, carbonate, and sulfate fertilizers and by-products consisting of galvanizing ash, galvanizing sludge, brass ash, and brass or scrap slag...
August 1, 2017: Journal of AOAC International
Narpinder Singh Chahil, G J Mankey
A novel sample stage integrated with a longitudinal MOKE system has been developed for wide temperature range measurements and annealing capabilities in the temperature range 65 K < T < 760 K. The sample stage incorporates a removable platen and copper block with inserted cartridge heater and two thermocouple sensors. It is supported and thermally coupled to a cold finger with two sapphire bars. The sapphire based thermal coupling enables the system to perform at higher temperatures without adversely affecting the cryostat and minimizes thermal drift in position...
July 2017: Review of Scientific Instruments
Francine Côa, Mathias Strauss, Zaira Clemente, Laís L Rodrigues Neto, Josias R Lopes, Rafael S Alencar, Antônio G Souza Filho, Oswaldo L Alves, Vera Lúcia S S Castro, Edison Barbieri, Diego Stéfani T Martinez
In this work, industrial grade multi-walled carbon nanotubes (MWCNT) were coated with humic acid (HA) for the first time by means of a milling process, which can be considered an eco-friendly mechanochemical method to prepare materials and composites. The HA-MWCNT hybrid material was characterized by atomic force microscopy (AFM), scanning electron microscopies (SEM and STEM), X-ray photoelectron spectroscopy (XPS), termogravimetric analysis (TGA), and Raman spectroscopy. STEM and AFM images demonstrated that the MWCNTs were efficiently coated by the humic acid, thus leading to an increase of 20% in the oxygen content at the nanotube surface as observed by the XPS data...
July 28, 2017: Science of the Total Environment
E Fontana, V Cenacchi, F Pivetti, A Pignatti, T Pazzi, L Bondanza, M Pazzi
A eight steps preparation of (14) C-labelled CHF6001, a potent PDE4 inhibitor in the treatment of respiratory diseases, is described. An overall yield of approximately 9% was obtained starting from copper[(14) C]cyanide. The synthesis of a stable labelled version of CHF6001 is also reported using the commercially available trideuterated bromomethylcyclopropane as starting material.
August 1, 2017: Journal of Labelled Compounds & Radiopharmaceuticals
T Garde-Cerdán, V Mancini, M Carrasco-Quiroz, A Servili, G Gutierrez-Gamboa, R Foglia, E P Perez-Alvarez, Gianfranco Romanazzi
Copper fungicides use is limited by the European regulation, therefore new strategies have been developed to prevent grapevine downy mildew (GDM). However, there is poor information about their effects on grape amino acid composition. This field trial aimed to evaluate the effect on grape amino acid composition of chitosan and of a mixture of laminarin and Saccharomyces extracts (LamE), applied in different strategies with copper hydroxide. The results showed that all the treatments applied to grapevines decreased the concentration of several amino acids...
July 31, 2017: Journal of Agricultural and Food Chemistry
Abeer H I Abdel-Karim
Fungal and bacterial contaminations are major problems facing in vitro date palm (Phoenix dactylifera L.) proliferation. To overcome this problem, we must first identify the fungal (e.g., Alternaria sp., Aspergillus niger, Penicillium sp.) and bacterial (e.g., Pseudomonas sp.) spread in date palm in vitro cultures. Incorporating fungicides (e.g., copper oxychloride, Vitavax T, and Topsin M) or antibiotics (e.g., streptomycin, Banocin, and Bencid D) at 500 mg/L in medium significantly reduces the contamination rate during various stages of in vitro date palm culture...
2017: Methods in Molecular Biology
Brian C Pierce, Jane Wittrup Agger, Zhenghong Zhang, Jesper Wichmann, Anne S Meyer
Lytic polysaccharide monooxygenases (LPMOs) are copper-dependent enzymes capable of the oxidative breakdown of polysaccharides. They are of industrial interest due to their ability to enhance the enzymatic depolymerization of recalcitrant substrates by glycoside hydrolases. In this paper, twenty-four lytic polysaccharide monooxygenases (LPMOs) expressed in Trichoderma reesei were evaluated for their ability to oxidize the complex polysaccharides in soybean spent flakes, an abundant and industrially relevant substrate...
July 18, 2017: Carbohydrate Research
S Vanhaecht, T Quanten, T N Parac-Vogt
A mild post-functionalization method, based on a copper(i) catalyzed azide-alkyne cycloaddition, was developed for the fragile [P2W15V3](9-) (PWV). PWV was functionalized with an azide and used as a platform to attach various alkyne functionalized compounds.
July 27, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
J Wu, A T Bollinger, X He, I Božović
The origin of high-temperature superconductivity in copper oxides and the nature of the 'normal' state above the critical temperature are widely debated. In underdoped copper oxides, this normal state hosts a pseudogap and other anomalous features; and in the overdoped materials, the standard Bardeen-Cooper-Schrieffer description fails, challenging the idea that the normal state is a simple Fermi liquid. To investigate these questions, we have studied the behaviour of single-crystal La2-xSrxCuO4 films through which an electrical current is being passed...
July 26, 2017: Nature
Thiago A D Rodrigues, Eduardo J DE Arruda, Magda F Fernandes, Claudio T DE Carvalho, Alessandra R Lima, Isaías Cabrini
Control strategies using insecticides are sometimes ineffective due to the resistance of the insect vectors.In this scenario new products must be proposed for the control of insect vectors.The complexes L-aspartate Cu (II) and L-glutamate-Cu (II) complexes were synthesized and characterized by elemental analysis, visible ultraviolet, infrared spectroscopy and potentiometric titration. The toxicity of these complexes was analyzed in Aedes aegypti (Diptera: Culicidae) larvae and Gram-negative and Gram-positive bacteria...
July 20, 2017: Anais da Academia Brasileira de Ciências
Heather Adams, Brendan P Miller, Octavio J Furlong, Marzia Fantauzzi, Gabriele Navarra, Antonella Rossi, Yufu Xu, Peter V Kotvis, Wilfred T Tysoe
The mechanochemical reaction between copper and dimethyl disulfide is studied under well-controlled conditions in ultrahigh vacuum (UHV). Reaction is initiated by fast S-S bond scission to form adsorbed methyl thiolate species, and the reaction kinetics are reproduced by two subsequent elementary mechanochemical reaction steps, namely a mechanochemical decomposition of methyl thiolate to deposit sulfur on the surface and evolve small, gas-phase hydrocarbons, and sliding-induced oxidation of the copper by sulfur that regenerates vacant reaction sites...
August 9, 2017: ACS Applied Materials & Interfaces
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