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https://www.readbyqxmd.com/read/28437070/large-scale-synthesis-of-carbon-shell-coated-fep-nanoparticles-for-robust-hydrogen-evolution-reaction-electrocatalyst
#1
Dong Young Chung, Samuel Woojoo Jun, Gabin Yoon, Hyunjoong Kim, Ji Mun Yoo, Kug-Seung Lee, Taehyun Kim, Heejong Shin, Arun Kumar Sinha, Soon Gu Kwon, Kisuk Kang, Taeghwan Hyeon, Yung-Eun Sung
A highly active and stable non-Pt electrocatalyst for hydrogen production has been pursued for a long time as an inexpensive alternative to Pt-based catalysts. Herein, we report a simple and effective approach to prepare high-performance iron phosphide (FeP) nanoparticle electrocatalysts using iron oxide nanoparticles as a precursor. A single-step heating procedure of polydopamine-coated iron oxide nanoparticles leads to both carbonization of polydopamine coating to the carbon shell and phosphidation of iron oxide to FeP, simultaneously...
May 3, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28374998/iridium-catalyzed-asymmetric-hydrogenation-of-unsaturated-carboxylic-acids
#2
Shou-Fei Zhu, Qi-Lin Zhou
Chiral carboxylic acid moieties are widely found in pharmaceuticals, agrochemicals, flavors, fragrances, and health supplements. Although they can be synthesized straightforwardly by transition-metal-catalyzed enantioselective hydrogenation of unsaturated carboxylic acids, because the existing chiral catalysts have various disadvantages, the development of new chiral catalysts with high activity and enantioselectivity is an important, long-standing challenge. Ruthenium complexes with chiral diphosphine ligands and rhodium complexes with chiral monodentate or bidentate phosphorus ligands have been the predominant catalysts for asymmetric hydrogenation of unsaturated acids...
April 4, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28362075/association-between-the-number-of-daily-steps-and-the-cardiovascular-risk-factors-in-basic-education-teachers
#3
Renata A Rodrigues de Oliveira, Paulo R Dos Santos Amorim, Rômulo J Mota, Debora D Ferreira Tavares, Fernanda Rocha de Faria, Osvaldo Costa Moreira, Luciana Moreira Lima, Raquel Rodrigues Britto, João C Bouzas Marins
BACKGROUND: Regular physical activity is suggested as an important non pharmacological mechanism to prevent cardiovascular diseases. Thus, the objective the presente study was to verify the association of the number of daily steps with cardiovascular risk factors in basic education teachers and analyze the suitability of the cutoff of 10,000 steps/day as a predictor for the main risk factors in this sample. METHODS: 200 teachers (43.2 + 10.2 years) of basic education were assessed in Viçosa-MG, Brazil...
March 30, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28328022/modifications-to-the-azide-method-for-nitrate-isotope-analysis
#4
Ying Tu, Yunting Fang, Dongwei Liu, Yuepeng Pan
RATIONALE: The azide method for measuring the stable isotope ratios of nitrate (NO3(-) ) is easy to set up. However, the method requires spongy cadmium (Cd) or activated Cd powder which are not easy to prepare, and a toxic azide buffer is used. We aimed to use Cd powder directly to simplify preparation and to substantially reduce the azide dose. METHODS: The reaction conditions were optimized in order to maximize the NO3(-) reduction yield. The original azide buffer was diluted by 10- to 10000-fold with or without addition of sodium acetate to reduce O-exchange between nitrite (NO2(-) ) and H2 O...
May 30, 2016: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28245357/optimization-and-application-of-direct-infusion-nanoelectrospray-hrms-method-for-large-scale-urinary-metabolic-phenotyping-in-molecular-epidemiology
#5
Elena Chekmeneva, Gonçalo Dos Santos Correia, Queenie Chan, Anisha Wijeyesekera, Adrienne Tin, Jeffery Hunter Young, Paul Elliott, Jeremy K Nicholson, Elaine Holmes
Large-scale metabolic profiling requires the development of novel economical high-throughput analytical methods to facilitate characterization of systemic metabolic variation in population phenotypes. We report a fit-for-purpose direct infusion nanoelectrospray high-resolution mass spectrometry (DI-nESI-HRMS) method with time-of-flight detection for rapid targeted parallel analysis of over 40 urinary metabolites. The newly developed 2 min infusion method requires <10 μL of urine sample and generates high-resolution MS profiles in both positive and negative polarities, enabling further data mining and relative quantification of hundreds of metabolites...
April 7, 2017: Journal of Proteome Research
https://www.readbyqxmd.com/read/28229522/fused-silica-capillaries-with-two-segments-of-different-internal-diameters-and-inner-surface-roughnesses-prepared-by-etching-with-supercritical-water-and-used-for-volume-coupling-electrophoresis
#6
Marie Horká, Pavel Karásek, Michal Roth, Karel Šlais
In this work, single-piece fused silica capillaries with two different internal diameter segments featuring different inner surface roughness were prepared by new etching technology with supercritical water and used for volume coupling electrophoresis. The concept of separation and online pre-concentration of analytes in high conductivity matrix is based on the online large-volume sample pre-concentration by the combination of transient isotachophoretic stacking and sweeping of charged proteins in micellar electrokinetic chromatography using non-ionogenic surfactant...
May 2017: Electrophoresis
https://www.readbyqxmd.com/read/28186746/unearthing-a-well-defined-highly-active-bimetallic-w-ti-precatalyst-anchored-on-a-single-silica-surface-for-metathesis-of-propane
#7
Manoja K Samantaray, Santosh Kavitake, Natalia Morlanés, Edy Abou-Hamad, Ali Hamieh, Raju Dey, Jean-Marie Basset
Two compatible organometallic complexes, W(Me)6 (1) and TiNp4 (2), were successively anchored on a highly dehydroxylated single silica support (SiO2-700) to synthesize the well-defined bimetallic precatalyst [(≡Si-O-)W(Me)5(≡Si-O-)Ti(Np)3] (4). Precatalyst 4 was characterized at the molecular level using advanced surface organometallic chemistry (SOMC) characterization techniques. The strong autocorrelation observed between methyl of W and Ti in (1)H-(1)H multiple-quantum NMR spectra demonstrates that W and Ti species are in close proximity to each other...
February 23, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/27605381/simultaneous-determination-of-multiple-intracellular-primary-metabolites-by-ultrahigh-performance-liquid-chromatography-coupled-with-a-q-exactive-hf-mass-spectrometer
#8
Nannan Qiu, Di Wu, Xia Cui, Guoliang Li, Sai Fan, Dawei Chen, Yunfeng Zhao, Yongning Wu
In this study, we established an ultrahigh-performance liquid chromatography-Q Exactive HF MS (UHPLC-HF MS) method for the simultaneous determination of 25 targeted metabolites relating to a broad coverage of central metabolic pathways, such as glycolysis pathway, tricarboxylic acid cycle (TCA), serine biosynthesis pathway (SSP), glutaminolysis pathway, and closely related biosynthetic reactions. A Shodex Asahipak NH2P-50 2D column was used to separate the targeted compounds, and Full MS + PRM detection using an electrospray ionization source in negative mode was employed...
October 4, 2016: Analytical Chemistry
https://www.readbyqxmd.com/read/27505000/an-inverse-method-to-estimate-the-root-water-uptake-source-sink-term-in-soil-water-transport-equation-under-the-effect-of-superabsorbent-polymer
#9
Renkuan Liao, Peiling Yang, Wenyong Wu, Shumei Ren
The widespread use of superabsorbent polymers (SAPs) in arid regions improves the efficiency of local land and water use. However, SAPs' repeated absorption and release of water has periodic and unstable effects on both soil's physical and chemical properties and on the growth of plant roots, which complicates modeling of water movement in SAP-treated soils. In this paper, we proposea model of soil water movement for SAP-treated soils. The residence time of SAP in the soil and the duration of the experiment were considered as the same parameter t...
2016: PloS One
https://www.readbyqxmd.com/read/26783528/tensile-bond-strengths-of-two-adhesives-on-irradiated-and-nonirradiated-human-dentin
#10
Cécile Bernard, Cyril Villat, Hazem Abouelleil, Marie-Paule Gustin, Brigitte Grosgogeat
The aim of this study was to assess the effect of radiotherapy on bond efficiency of two different adhesive systems using tensile bond strength test. Twenty extracted teeth after radiotherapy and twenty nonirradiated extracted teeth were used. The irradiation was applied in vivo to a minimal dose of 50 Gy. The specimens of each group were randomly assigned to two subgroups to test two different adhesive systems. A three-step/etch-and-rinse adhesive system (Optibond FL) and a two-steps/self-etch adhesive system (Optibond XTR) were used...
2015: BioMed Research International
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