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https://www.readbyqxmd.com/read/29786972/a-lyophilized-and-thermal-two-step-synthesis-of-cofe-alloy-nanoparticles-embedded-in-n-doped-carbon-nanosheets-carbon-nanotubes-for-highly-efficient-oxygen-evolution-reaction
#1
Yang Liu, Feng Li, Haidong Yang, Jing Li, Ping Ma, Yan Zhu, Jiantai Ma
There is a vital need to explore highly-efficient and stable nonprecious-metal catalysts for oxygen evolution reaction (OER) to reduce the overpotential and further improve the energy conversion efficiency. Herein, we report a unique and cost-effective lyophilized and thermal two step procedure to synthesize high-performance CoFe alloy nanoparticles embedded in N-doped carbon nanosheets interspersed with carbon nanotubes (CoFe-N-CN/CNTs) hybrid. The lyophilization step during catalysts preparation is beneficial to uniform the dispersion of carbon-like precursors and avoid the agglomeration of metal particles...
May 22, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29786900/avian-demographic-responses-to-drought-and-fire-a-community-level-perspective
#2
James F Saracco, Stephen M Fettig, George L San Miguel, David W Mehlman, Steven K Albert
Drought stress is an important consideration for wildlife in arid and semi-arid regions under climate change. Drought can impact plant and animal populations directly, through effects on their physiology, as well as indirectly through effects on vegetation productivity and resource availability, and by creating conditions conducive to secondary disturbance, such as wildfire. We implemented a novel approach to understanding community-level demographic responses of birds and their habitats to these stressors in the context of climate change at 14 study sites in the Four Corners region of the southwestern United States...
May 22, 2018: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/29786767/oral-supplementation-of-lanthanum-zirconate-nanoparticles-moderately-affected-behavior-but-drastically-disturbed-leukocyte-count-serum-cholesterol-levels-and-antioxidant-parameters-from-vital-organs-of-albino-mice-in-a-gender-specific-manner
#3
Muhammad Nazar Aftab, Irum Naz Akram, Tafheem Khosa, Syeda Qandeel Zahra, Irum Bashir, Muhammad Naeem Ashiq, Furhan Iqbal
Lanthanum Zirconate nanoparticles (NPs) are used in blades of gas turbine engines to thermally insulate them and to protect them against hot and corrosive gas streams. However, the information regarding their biocompatibility is limited. The present study was aimed to report the effect of Lanthanum Zirconate NPs on selected aspects of behavior, serum biochemistry, complete blood count and antioxidant parameters from vital organs of albino mice in a gender specific manner. Albino mice, seven weeks old, were orally treated with 75 mg/ml solvent/Kg body weight of Lanthanum Zirconate nanoparticles for consecutive 22 days...
May 21, 2018: Metabolic Brain Disease
https://www.readbyqxmd.com/read/29786671/mechanisms-of-action-and-cell-death-associated-with-clostridium-perfringens-toxins
#4
REVIEW
Mauricio A Navarro, Bruce A McClane, Francisco A Uzal
Clostridium perfringens uses its large arsenal of protein toxins to produce histotoxic, neurologic and intestinal infections in humans and animals. The major toxins involved in diseases are alpha (CPA), beta (CPB), epsilon (ETX), iota (ITX), enterotoxin (CPE), and necrotic B-like (NetB) toxins. CPA is the main virulence factor involved in gas gangrene in humans, whereas its role in animal diseases is limited and controversial. CPB is responsible for necrotizing enteritis and enterotoxemia, mostly in neonatal individuals of many animal species, including humans...
May 22, 2018: Toxins
https://www.readbyqxmd.com/read/29786619/-i-in-situ-i-nap-xps-spectroscopy-during-methane-dry-reforming-on-zro-sub-2-sub-pt-111-inverse-model-catalyst
#5
Christoph Rameshan, Hao Li, Kresimir Anic, Matteo Roiaz, Verena Pramhaas, Raffael Rameshan, Raoul Blume, Michael Hävecker, Jan Knudsen, Axel Knop-Gericke, Gunther Rupprechter
Due to the need of sustainable energy sources, methane dry reforming (MDR) is a useful reaction for the conversion of the greenhouse gases CH<sub>4</sub> and CO<sub>2</sub> to synthesis gas (CO + H<sub>2</sub>). Syngas is the basis for a wide range of commodity chemicals and can be utilized for fuel production via Fischer-Tropsch (FT) synthesis. The current study focuses on spectroscopic investigations of the surface and reaction properties of a ZrO<sub>2</sub>/Pt inverse model catalyst, i...
May 22, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29786608/microscopic-aspects-of-wetting-using-classical-density-functional-theory
#6
Peter Yatsyshin, Miguel A Duran-Olivencia, Serafim Kalliadasis
Wetting is a rather efficient mechanism for nucleation of a phase (typically liquid) on the interface
 between two other phases (typically solid and gas). In many experimentally
 accessible cases of wetting, the interplay between the substrate structure,
 and the fluid-fluid and fluid-substrate intermolecular interactions brings
 about an entire ``zoo" of possible fluid configurations, such as liquid
 films with a thickness of a few nanometers, liquid nanodrops and liquid
 bridges...
May 22, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29786572/dysadipokinemia-in-patients-with-gout-and-its-association-with-the-disease-activity
#7
Inna V Orlova, Mykola A Stanislavchuk, Iryna P Gunko
OBJECTIVE: Introduction: In recent years, the role of adipokines in the development of rheumatic diseases has been a pressing issue. The available data suggest the dysadipokinemia in patients with rheumatoid arthritis, osteoarthritis and psoriatic arthritis. However, there is no data on changes in the levels of adipokines in patients with gout and their association with the activity of inflammatory process. The aim was to study the levels of adipokines in gout patients and evaluate their association with the disease activity...
2018: Wiadomości Lekarskie: Organ Polskiego Towarzystwa Lekarskiego
https://www.readbyqxmd.com/read/29786447/thickness-tunable-synthesis-of-ultrathin-type-ii-dirac-semimetal-ptte-2-single-crystals-and-their-thickness-dependent-electronic-properties
#8
Huifang Ma, Peng Chen, Bo Li, Jia Li, Ruoqi Ai, Zhengwei Zhang, Guangzhuang Sun, Kangkang Yao, Zhaoyang Lin, Bei Zhao, Ruixia Wu, Xuwan Tang, Xidong Duan, Xiangfeng Duan
The recent discovery of topological semimetals has stimulated extensive research interest due to their unique electronic properties and novel transport properties related to a chiral anomaly. However, the studies to date are largely limited to bulk crystals and exfoliated flakes. Here, we report the controllable synthesis of ultrathin two-dimensional (2D) platinum telluride (PtTe2 ) nanosheets with tunable thickness and investigate the thickness-dependent electronic properties. We show that PtTe2 nanosheets can be readily grown, using a chemical vapor deposition approach, with a hexagonal or triangular geometry and a lateral dimension of up to 80 μm, and the thickness of the nanosheets can be systematically tailored from over 20 to 1...
May 22, 2018: Nano Letters
https://www.readbyqxmd.com/read/29786441/x-ray-photoelectron-spectroscopy-studies-of-nanoparticles-dispersed-in-static-liquid
#9
Luan Nguyen, Paul Pengcheng Tao, Huimin Liu, Mohamed Al-Hada, Matteo Amati, Hikmet Sezen, Luca Gregoratti, Yu Tang, Stephen D House, Franklin Feng Tao
For nanoparticles active for chemical and energy transformations in liquid environment, chemistries of surface or near-surface regions of these catalyst nanoparticles in liquid are crucial for fundamentally understanding their catalytic performances at a molecular level. Compared to catalysis at a solid-gas interface, there is very limited information on surface of these catalyst nanoparticles under working condition or during catalysis. Photoelectron spectroscopy is a surface-sensitive technique; however, it is challenging to study the surfaces of catalyst nanoparticles dispersed in liquid due to the short inelastic mean free path of photoelectrons travelling in liquid...
May 22, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29786425/comprehensive-study-of-the-evolution-of-gas-liquid-partitioning-of-acetaldehyde-during-wine-alcoholic-fermentation
#10
Evelyne Aguera, Yannick Sire, Jean-Roch Mouret, Jean-Marie Sablayrolles, Vincent Farines
Determining the gas-liquid partitioning (K_i) of acetaldehyde during alcoholic fermentation is an important step in the optimization of fermentation control with the aim of minimizing the accumulation of this compound responsible for the undesired attributes of green apples and fresh cut grass in wines. In this work, the effect of the main fermentation parameters on the K_i of acetaldehyde was assessed. K_i values were found to be dependent on the temperature and composition of the medium. A non-linear correlation between the evolution of the K_i and fermentation progress was observed, attributed to the strong retention effect of ethanol at low concentrations and it was demonstrated that the partitioning of this specific molecule was not influenced by the CO2 production rate...
May 22, 2018: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29786418/synthesis-spray-deposition-and-hot-press-transfer-of-copper-nanowires-for-flexible-transparent-electrodes
#11
Rupali Deshmukh, Micha Calvo, Murielle Schreck, Elena Tervoort, Alla S Sologubenko, Markus Niederberger
We report a solution-phase approach to the synthesis of crystalline copper nanowires (Cu NWs) with aspect ratio > 1000 via a new catalytic mechanism comprising copper ions. The synthesis involves the reaction between copper(II) chloride and copper(II) acetylacetonate in a mixture of oleylamine and octadecene. Reaction parameters such as the molar ratio of precursors as well as the volume ratio of solvents offer the possibility to tune the morphology of the final product. A simple low-cost spray deposition method was used to fabricate Cu NW films on a glass substrate...
May 22, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29786417/ultraselective-pebax-membranes-enabled-by-templated-microphase-separation
#12
Yatao Zhang, Yijia Shen, Jingwei Hou, Yiming Zhang, Winny Fam, Jindun Liu, Thomas D Bennett, Vicki Chen
Block copolymer materials have been considered as promising candidates to fabricate gas separation membranes. This microphase separation affects the polymer chain packing density and molecular separation efficiency. Here we demonstrate a method to template microphase separation within a thin composite Pebax membrane, through the controllable self-assembly of one-dimensional halloysite nanotubes (HNTs) within the thin film via solution casting technique. Crystallisation of the polyamide component is induced at the HNT surface, guiding subsequent crystal growth around the tubular structure...
May 22, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29786164/air-activated-self-decontaminating-polydicyclopentadiene-polyhipe-foams-for-rapid-decontamination-of-chemical-warfare-agents
#13
Christopher L McGann, Grant C Daniels, Spencer L Giles, Robert B Balow, Jorge L Miranda-Zayas, Jeffrey G Lundin, James H Wynne
The threat of chemical warfare agents (CWA) compels research into novel self-decontaminating materials (SDM) for the continued safety of first-responders, civilians, and active service personnel. The capacity to actively detoxify, as opposed to merely sequester, offending agents under typical environmental conditions defines the added value of SDMs in comparison to traditional adsorptive materials. Porous polymers, synthesized via the high internal phase emulsion (HIPE) templating, provide a facile fabrication method for materials with permeable open cellular structures that may serve in air filtration applications...
May 22, 2018: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/29785872/effect-evaluation-on-use-of-bedside-fiber-bronchoscope-in-treating-stroke-associated-pneumonia
#14
Qiu Han, Chun Chen, Hai-Qin Hu, Jun Shen, Guang Yang, Bin Chen, Lei Xia
Background The bedside fiber bronchoscope has been widely used in the diagnosis and treatment of respiratory disease. This study aims to assess the effect of using bedside fiber bronchoscope in sputum suction and alveolar lavage for treatment of stroke-associated pneumonia (SAP), compared with the use of conventional suction catheter. Methods One hundred and six patients with SAP were randomly divided into control group (n = 53) and experimental group (n = 53) for a controlled study. Patients in the two groups were conventionally treated with phlegm-resolving and anti-infective therapy...
May 22, 2018: Topics in Stroke Rehabilitation
https://www.readbyqxmd.com/read/29785852/syntheses-of-gibberellins-a-15-and-a-24-the-key-metabolites-in-gibberellin-biosynthesis
#15
David J-Y D Bon, Lewis Norman Mander, Ping Lan
Gibberellins (GAs) are essential phytohormones involved in numerous aspects of plant growth and development. Notably, the biochemistry and genetics of GA biosynthesis which is associated with their endogenous regulation has been largely resolved, however, a crucial unsolved question remains: the precise mechanism of the stepwise oxidation and subsequent removal of C-20 from C20-precursors leading to bioactive C19 gibberellins is still unresolved. In order to satisfy numerous requests from biologists, practical preparations of certain GAs that were isolated in miniscule quantities are highly demanded...
May 22, 2018: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/29785750/cellulose-membrane-modified-with-polypyrrole-as-an-extraction-device-for-the-determination-of-emerging-contaminants-in-river-water-with-gc-ms
#16
Bárbara Viero de Noronha, Márcio Fernando Bergamini, Luiz Humberto Marcolino Junior, Bruno José Gonçalves da Silva
In this study, a simple, efficient, and reusable device based on cellulose membranes modified with polypyrrole was developed to extract 14 emerging contaminants from aqueous matrices. For chemical polymerization, a low-cost cellulose membrane was immersed in 0.1 mol L-1 pyrrole and 0.5 mol L-1 ammonium persulfate for 40 min in an ice/water bath. The cellulose membranes modified with polypyrrole were accommodated in a polycarbonate holder suitable for solid-phase extraction disks. Solid-phase extraction parameters that affect extraction efficiency, such as sample volume, pH, flow-rate, and desorption were optimized...
May 21, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/29785738/mass-spectrometry-for-characterization-of-homologous-piperidine-alkaloids-and-their-activity-as-acetylcholinesterase-inhibitors
#17
Thamires R Freitas, Amanda Danuello, Claudio Viegas Júnior, Vanderlan S Bolzani, Marcos Pivatto
RATIONALE: Piperidine alkaloids from Senna spectabilis constitute a rare class of natural products with several biological activities. However, the absence of chromophores makes their structural elucidation by conventional methods a great challenge. In this context, mass spectrometry emerges as a powerful tool for metabolomics studies. METHODS: The piperidine alkaloids (-)-cassine and (-)-spectaline and the semisynthetic derivatives (-)-3-O-acetylcassine and (-)-3-O-acetylspectaline were investigated by electrospray ionization tandem mass spectrometry (ESI-MS/MS) in the positive mode and electron ionization mass spectrometry (EI-MS)...
May 22, 2018: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/29785645/concurrent-coupling-of-realistic-and-ideal-models-of-liquids-and-solids-in-hamiltonian-adaptive-resolution-simulations
#18
Maziar Heidari, Robinson Cortes-Huerto, Kurt Kremer, Raffaello Potestio
To understand the properties of a complex system it is often illuminating to perform a comparison with a simpler, even idealised one. A prototypical application of this approach is the calculation of free energies and chemical potentials in liquids, which can be decomposed in the sum of ideal and excess contributions. In the same spirit, in computer simulations it is possible to extract useful information on a given system making use of setups where two models, an accurate one and a simpler one, are concurrently employed and directly coupled...
May 23, 2018: European Physical Journal. E, Soft Matter
https://www.readbyqxmd.com/read/29785608/reuse-of-organobentonites-with-a-carbon-dioxide-responsive-solvent
#19
Ling-Yu Luan, Li Zhang, Li-Hong Wang
Synthesized organobentonite (SOB), montmorillonite (MMT), and commercial organobentonite (COB) were used as adsorbents for paraffin oil, a model pollutant in land-based oil spills and oil pipeline rupture. The characterization of clays was carried out with scanning electron microscopy (SEM), thermogravimetric analysis (TG), Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD). After adsorption, oil was separated from adsorbents with a carbon dioxide responsive solvent N,N-dimethylcyclohexylamine (DMCHA), and DMCHA was subsequently separated from paraffin oil upon CO2 bubbling instead of distillation with high energy cost...
May 22, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29785595/a-preliminary-investigation-on-water-quality-of-coalbed-natural-gas-produced-water-for-beneficial-uses-a-case-study-in-the-southern-qinshui-basin-north-china
#20
Zheng Zhang, Yong Qin
Coalbed natural gas (CBNG) is an important unconventional natural gas resource with large reserves in China and receives much attention these years. The CBNG production is accomplished by extracting large volumes of produced water from the aquifer. The CBNG-produced water is commonly managed by discharging into nearby disposal ponds in the Southern Qinshui Basin (SQB), which provides an opportunity for water source for nearby irrigation, livestock, wildlife, and human drinking water. However, utilization of this nontraditional water source in the SQB is hindered by limited knowledge of water quality, practically oxidation/reduction potential (OPR), electrical conductivity (EC), sodium adsorption ration (SAR), and trace element chemistry data...
May 21, 2018: Environmental Science and Pollution Research International
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