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https://www.readbyqxmd.com/read/28431375/radioactivity-in-wastes-generated-from-shale-gas-exploration-and-production-north-eastern-poland
#1
Paweł Jodłowski, Jan Macuda, Jakub Nowak, Chau Nguyen Dinh
In the present study, the K-40, U-238, Ra-226, Pb-210, Ra-228 and Th-228 activity concentrations were measured in 64 samples of wastes generated from shale gas exploration in North-Eastern Poland. The measured samples consist of drill cuttings, solid phase of waste drilling muds, fracking fluids, return fracking fluids and waste proppants. The measured activity concentrations in solid samples vary in a wide range from 116 to around 1100 Bq/kg for K-40, from 14 to 393 Bq/kg for U-238, from 15 to 415 Bq/kg for Ra-226, from 12 to 391 Bq/kg for Pb-210, from a few Bq/kg to 516 Bq/kg for Ra-228 and from a few Bq/kg to 515 Bq/kg for Th-228...
April 18, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28431208/copper-catalyzed-chemoselective-and-enantioselective-friedel-crafts-1-2-addition-of-pyrrole-with-%C3%AE-%C3%AE-unsaturated-%C3%AE-ketoesters
#2
Jianan Sun, Yanbin Hu, Yanan Li, Sheng Zhang, Zhenggen Zha, Zhiyong Wang
A Friedel-Crafts alkylation of pyrrole was developed to afford the β,γ-unsaturated α-hydroxy esters bearing quaternary stereogenic center with good enantioselectivities and yields. This protocol represents the first report of 1,2-addition of Friedel-Crafts alkylation of pyrrole to β,γ-unsaturated α-ketoesters.
April 21, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28430482/hopping-time-scales-and-the-phonon-liquid-electron-crystal-picture-in-thermoelectric-copper-selenide
#3
D J Voneshen, H C Walker, K Refson, J P Goff
The suppression of transverse phonons by liquidlike diffusion in superionic conductors has been proposed as a means to dramatically reduce thermal conductivity in thermoelectric materials [H. Lui et al. Nat. Mater. 11, 422 (2012)NMAACR1476-112210.1038/nmat3273]. We have measured the ion transport and lattice dynamics in the original phonon-liquid electron-crystal Cu_{2}Se using neutron spectroscopy. We show that hopping time scales are too slow to significantly affect lattice vibrations and that the transverse phonons persist at all temperatures...
April 7, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28430263/energetic-materials-identification-by-laser-induced-breakdown-spectroscopy-combined-with-artificial-neural-network
#4
Amir Hossein Farhadian, Masoud Kavosh Tehrani, Mohammad Hossein Keshavarz, Seyyed Mohammad Reza Darbani
In this study, for the first time to the best of our knowledge, a combination of the laser-induced breakdown spectroscopy (LIBS) technique and artificial neural network (ANN) analysis has been implemented for the identification of energetic materials, including TNT, RDX, black powder, and propellant. Also, aluminum, copper, inconel, and graphite have been used for more accurate investigation and comparison. After the LIBS test and spectrum acquisition on all samples in both air and argon ambient, optimized neural networks were designed by LIBS data...
April 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28430106/atomic-motions-in-the-layered-copper-pseudochalcogenide-cuncn-indicative-of-a-quantum-spin-liquid-scenario
#5
Andrei L Tchougreeff, Ralf Stoffel, Andreas Houben, Philipp Jacobs, Richard Dronskowski, Matej Pregelj, Andrej Zorko, Denis Arcon, Oksana Zaharko
We explore the thermodynamic properties of the layered copper(II) carbodiimide CuNCN by heat-capacity measurements and investigate the corresponding thermal atomic motions by means of neutron powder diffraction as well as inelastic neutron scattering. The experiments are complemented by a combination of density-functional calculations, phonon analysis and analytic theory. The existence of a soft flexural mode-bending of the layers, characteristic for the material structure-is established in the phonon spectrum of CuNCN by giving characteristic temperature-dependent contributions to the heat capacity and atomic displacement parameters...
April 21, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28429945/copper-catalyzed-oxidative-cyclization-of-2-amino-azaarenes-with-lignin-models-synthesis-of-3-phenoxy-imidazo-heterocycles
#6
Jian Zhang, Xiunan Lu, Tingyan Li, Shanlu Wang, Guofu Zhong
A catalytic oxidative cyclization of 2-aminopyridines or 2-aminobenzothiazole with 2-phenoxyacetophenones (a kind of lignin platform compounds) was developed, efficiently providing valuable 3-phenoxy imidazo[1,2-a]pyridines or 3-phenoxy benzo[d]imidazo[2,1-b]thiazoles. The reaction was realized under oxygen by simply using inexpensive CuI as the catalyst.
April 21, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28429749/corrigendum-a-doping-lattice-of-aluminum-and-copper-with-accelerated-electron-transfer-process-and-enhanced-reductive-degradation-performance
#7
Lin Zhang, Xue Gao, Zhixuan Zhang, Mingbo Zhang, Yiqian Cheng, Jixin Su
No abstract text is available yet for this article.
April 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28429192/photoinactivation-effect-of-eosin-methylene-blue-and-chlorophyllin-sodium-copper-against-staphylococcus-aureus-and-escherichia-coli
#8
Cynthia S A Caires, Cassia R B Leal, Carlos A N Ramos, Danielle Bogo, Alessandra R Lima, Eduardo J Arruda, Samuel L Oliveira, Anderson R L Caires, Valter A Nascimento
The use of eosin methylene blue according to Giemsa as photosensitizer is presented for the first time in this paper. The present study evaluated the potential application of chlorophyllin sodium copper salt (CuChlNa) and eosin methylene blue according to Giemsa (EMB) as antimicrobial photosensitizers (aPS) for photodynamic inactivation (PDI) of Staphylococcus aureus (gram-positive) and Escherichia coli (gram-negative) bacteria. The experiments were performed using S. aureus stain ATCC 25923 and E. coli ATCC 25922 in which five aPS concentrations (0...
April 20, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28429021/preparation-and-characterization-of-metastable-trigonal-layered-msb2o6-phases-m-co-ni-cu-zn-and-mg-and-considerations-on-fesb2o6
#9
A Yu Nikulin, E A Zvereva, V B Nalbandyan, I L Shukaev, A I Kurbakov, M D Kuchugura, G V Raganyan, Yu V Popov, V D Ivanchenko, A N Vasiliev
MSb2O6 compounds (M = Mg, Co, Ni, Cu, Zn) are known in the tetragonal trirutile forms, slightly distorted monoclinically with M = Cu due to the Jahn-Teller effect. In this study, using a low-temperature exchange reaction between ilmenite-type NaSbO3 and molten MSO4-KCl (or MgCl2-KCl) mixtures, these five compositions were prepared for the first time as trigonal layered rosiaite (PbSb2O6)-type phases. Upon heating, they irreversibly transform to the known phases via amorphous intermediates, in contrast to previously studied isostructural MnSb2O6, where the stable phase is structurally related to the metastable phase...
April 21, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28429010/going-beyond-the-three-state-ensemble-model-the-electronic-chemical-potential-and-fukui-function-for-the-general-case
#10
Marco Franco-Pérez, Farnaz Heidar-Zadeh, Paul W Ayers, José L Gázquez, Alberto Vela
Making use of the grand canonical ensemble the derivation of the analytical equations for the chemical potential and the Fukui function in the general case of any number of ground and excited states is presented. The expressions thus obtained allow one to establish that the ensemble of three consecutive ground states that has been usually used to analyze the effects of temperature in these quantities provides a satisfactory description for them at temperatures of chemical interest. Nevertheless, some situations must be considered cautiously, as for example, when the N + k and N + k + 1 (N is the electron number) ground states are (nearly) quasidegenerate or when the first excited state of both the anion and the cation (with respect to the reference state) is very low in energy...
April 21, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28429000/copper-catalyzed-asymmetric-alkynylation-of-cyclic-n-sulfonyl-ketimines
#11
Zheng Ling, Sonia Singh, Fang Xie, Liang Wu, Wanbin Zhang
A Cu-catalyzed asymmetric alkynylation of cyclic N-sulfonyl ketimines was developed, providing the corresponding chiral α-tertiary amines with up to 98% ee. The method tolerates some variations in cyclic N-sulfonyl ketimine and alkyne scope. These products could be used in several transformations, in particular, the products of 6-membered cyclic N-sulfonyl ketimines could be easily converted to linear chiral α-tertiary amines. This asymmetric alkynylation provides an efficient, gram-scale, low-cost transition-metal catalyzed synthesis of chiral α-tetrasubstituted propargylamines...
April 21, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28428956/physiological-functions-of-the-cellular-prion-protein
#12
REVIEW
Andrew R Castle, Andrew C Gill
The prion protein, PrP(C), is a small, cell-surface glycoprotein notable primarily for its critical role in pathogenesis of the neurodegenerative disorders known as prion diseases. A hallmark of prion diseases is the conversion of PrP(C) into an abnormally folded isoform, which provides a template for further pathogenic conversion of PrP(C), allowing disease to spread from cell to cell and, in some circumstances, to transfer to a new host. In addition to the putative neurotoxicity caused by the misfolded form(s), loss of normal PrP(C) function could be an integral part of the neurodegenerative processes and, consequently, significant research efforts have been directed toward determining the physiological functions of PrP(C)...
2017: Frontiers in Molecular Biosciences
https://www.readbyqxmd.com/read/28428350/targeted-inactivation-of-copper-transporter-atp7b-in-hepatocytes-causes-liver-steatosis-and-obesity-in-mice
#13
Abigael Muchenditsi, Haojun Yang, James P Hamilton, Lahari Koganti, Franck Housseau, Lisa Aronov, Hongni Fan, Hannah Pierson, Ashima Bhattacharjee, Robert C Murphy, Cynthia L Sears, James J Potter, Clavia Ruth Wooton-Kee, Svetlana Lutsenko
The copper transporter ATP7B is essential for mammalian copper homeostasis. Mutations in ATP7B result in copper accumulation, especially in the liver, and cause Wilson disease (WD). The major role of hepatocytes in WD pathology is firmly established. It is less certain whether the excess Cu in hepatocytes is solely responsible for development of WD. To address this issue, we generated a mouse strain for Cre-mediated deletion of Atp7b and inactivated Atp7b selectively in hepatocytes. Atp7bΔ(Hep) mice accumulate copper in the liver, have elevated urinary copper, lack holo-ceruloplasmin, but show no liver disease for up to 30 weeks...
April 20, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/28428128/novel-combination-of-zero-valent-cu-and-ag-nanoparticles-cellulose-acetate-nanocomposite-for-the-reduction-of-4-nitro-phenol
#14
Farman Ullah Khan, Asimullah, Sher Bahadar Khan, Tahseen Kamal, Abdullah M Asiri, Ihsan Ullah Khan, Kalsoom Akhtar
A very simple and low-cost procedure has been adopted to synthesize efficient copper (Cu), silver (Ag) and copper-silver (Cu-Ag) mixed nanoparticles on the surface of pure cellulose acetate (CA) and cellulose acetate-copper oxide nanocomposite (CA-CuO). All nanoparticles loaded onto CA and CA-CuO presented excellent catalytic ability, but Cu-Ag nanoparticles loaded onto CA-CuO (Cu-Ag/CA-CuO) exhibited outstanding catalytic efficiency to convert 4-nitrophenol (4-NP) into 4-aminophenol (4-AP) in the presence of NaBH4...
April 17, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28428045/sco2-deficient-mice-develop-increased-adiposity-and-insulin-resistance
#15
Shauna Hill, Sathyaseelan S Deepa, Kavithalakshmi Sataranatarajan, Pavithra Premkumar, Daniel Pulliam, Yuhong Liu, Vanessa Y Soto, Kathleen E Fischer, Holly Van Remmen
Cytochrome c oxidase (COX) is an essential transmembrane protein complex (Complex IV) in the mitochondrial respiratory electron chain. Mutations in genes responsible for the assembly of COX are associated with Leigh syndrome, cardiomyopathy, spinal muscular atrophy and other fatal metabolic disorders in humans. Previous studies have shown that mice lacking the COX assembly protein Surf1 (Surf1(-/-) mice) paradoxically show a number of beneficial metabolic phenotypes including increased insulin sensitivity, upregulation of mitochondrial biogenesis, induction of stress response pathways and increased lifespan...
April 17, 2017: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/28427685/fe3o4-hydroxyapatite-graphene-quantum-dots-as-a-novel-nano-sorbent-for-preconcentration-of-copper-residue-in-thai-food-ingredients-optimization-of-ultrasound-assisted-magnetic-solid-phase-extraction
#16
Phitchan Sricharoen, Nunticha Limchoowong, Yonrapach Areerob, Prawit Nuengmatcha, Suchila Techawongstien, Saksit Chanthai
Fe3O4/hydroxyapatite/graphene quantum dots (Fe3O4/HAP/GQDs) nanocomposite was synthesized and used as a novel magnetic adsorbent. This nanocomposite was characterized using scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, energy dispersive X-ray spectroscopy, and magnetization property. The Fe3O4/HAP/GQDs was applied to pre-concentrate copper residues in Thai food ingredients (so-called "Tom Yum Kung") prior to determination by inductively coupled plasma-atomic emission spectrometry...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28427663/fast-sono-assisted-ferrofluid-mediated-silver-super-adsorption-over-magnesium-ferrite-copper-sulfide-chalcogenide-with-the-aid-of-multivariate-optimization
#17
Ali Asghar Rezaei, Mostafa Hossein Beyki, Farzaneh Shemirani
This research focuses on the development of a fast ultrasonic assisted ferrofluid mediated methodology to obtain the optimum conditions for silver adsorption from aqueous solutions. For this purpose magnesium ferrite-copper sulfide chalcogenide was synthesized and employed as an efficient nanosorbent. The sorbent was characterized with energy-dispersive X-ray spectroscopy (EDX), field emission scanning electron microscopy (FE-SEM), X-ray powder diffraction (XRD) and vibrational sample magnetometry (VSM) techniques...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28427628/ultrasonic-energy-enhanced-the-efficiency-of-advance-extraction-methodology-for-enrichment-of-trace-level-of-copper-in-serum-samples-of-patients-having-neurological-disorders
#18
Mariam S Arain, Tasneem G Kazi, Hassan I Afridi, Jamshed Ali, Asma Akhtar
An innovative dual dispersive ionic liquid based on ultrasound assisted microextraction (UDIL-μE), for the enrichment of trace levels of copper ion (Cu(2+)), in serum (blood) of patients suffering from different neurological disorders. The enriched metal ions were subjected to flame atomic absorption spectrometry (FAAS). In the UDIL-μE method, the extraction solvent, ionic liquid, 1-butyl-3-methylimidazolium hexafluorophosphate [C4mim][PF6], was dispersed into the aqueous samples using an ultrasonic bath...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28427615/utilization-of-ultrasonic-irradiation-as-a-green-and-effective-strategy-to-prepare-poly-n-vinyl-2-pyrrolidone-modified-nano-copper-ii-oxide-nanocomposites
#19
Shadpour Mallakpour, Atefeh Jarahiyan
The present paper describes the result of investigations into preparation of novel nanocomposites (NCs) based on poly(N-vinyl-2-pyrrolidone) (PVP) as a biocompatible polymer and modified copper (II) oxide nanoparticles (NPs) as a nano-filler. To achieve optimum NCs properties, different ratios of modified copper (II) oxide NPs (3, 5, and 7wt%) were used to fabricate PVP NCs and also the ultrasonic irradiation was utilized to perform these processes as a fast and effective method. Subsequently, the structure of the obtained nanohybrids was characterized by various techniques...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28427259/copper-catalyzed-diaryl-ether-formation-from-hetero-aryl-halides-at-low-catalytic-loadings
#20
Yuntong Zhai, Xiaofei Chen, Wei Zhou, Mengyang Fan, Yisheng Lai, Dawei Ma
Diaryl formation is achieved by coupling phenols and (hetero)aryl halides under the catalysis of CuI/N,N'-bis(2-phenylphenyl) oxalamide (BPPO) or CuI/ N-(2-phenylphenyl)-N'-benzyl oxalamide (PPBO) at 90 degrees C using DMF or MeCN as the solvent. Only 0.2-2 mol % CuI and ligand are required for completer conversion, which represents the lowest catalytic loadings for a general Cu/ligand-catalyzed diaryl ether formation.
April 21, 2017: Journal of Organic Chemistry
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