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Molybdenum

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https://www.readbyqxmd.com/read/29909632/mild-deoxygenation-of-sulfoxides-over-plasmonic-molybdenum-oxide-hybrid-with-dramatic-activity-enhancement-under-visible-light
#1
Yasutaka Kuwahara, Yukihiro Yoshimura, Kohei Haematsu, Hiromi Yamashita
Harvesting solar light to boost commercially important organic synthesis still remains a challenge. Coupling of conventional noble metal catalysts with plasmonic oxide materials which exhibit intense plasmon absorption in the visible light region is a promising option for efficient solar energy utilization in catalysis. Herein we for the first time demonstrate that plasmonic hydrogen molybdenum bronze coupled with Pt nanoparticles (Pt/Hx MoO3-y ) shows a high catalytic performance in the deoxygenation of sulfoxides with 1 atm H2 at room temperature, with dramatic activity enhancement under visible light irradiation relative to dark condition...
June 17, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29908458/body-burden-of-toxic-metals-and-rare-earth-elements-in-non-smokers-cigarette-smokers-and-electronic-cigarette-users
#2
Mihaela Badea, Octavio P Luzardo, Ana González-Antuña, Manuel Zumbado, Liliana Rogozea, Laura Floroian, Dana Alexandrescu, Marius Moga, Laura Gaman, Mariana Radoi, Luis D Boada, Luis Alberto Henríquez-Hernández
Smoking is considered an important source for inorganic elements, most of them toxic for human health. During the last years, there has been a significant increase in the use of e-cigarettes, although the role of them as source of inorganic elements has not been well established. A cross-sectional study including a total of 150 subjects from Brasov (Romania), divided into three groups (non-smokers, cigarette smokers and electronic cigarettes smokers) were recruited to disclose the role of smoking on the human exposure to inorganic elements...
June 13, 2018: Environmental Research
https://www.readbyqxmd.com/read/29907026/2d-nanoporous-membrane-for-cation-removal-from-water-effects-of-ionic-valence-membrane-hydrophobicity-and-pore-size
#3
Mateus Henrique Köhler, José Rafael Bordin, Marcia C Barbosa
Using molecular dynamic simulations, we show that single-layers of molybdenum disulfide (MoS2 ) and graphene can effectively reject ions and allow high water permeability. Solutions of water and three cations with different valencies (Na+ , Zn2+ , and Fe3+ ) were investigated in the presence of the two types of membranes, and the results indicate a high dependence of the ion rejection on the cation charge. The associative characteristic of ferric chloride leads to a high rate of ion rejection by both nanopores, while the monovalent sodium chloride induces lower rejection rates...
June 14, 2018: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29900369/first-evidence-of-wulfenite-in-calabria-region-southern-italy
#4
A Bloise, L Dattola, I Allegretta, R Terzano, M Taranto, D Miriello
This data article contains mineralogical and chemical data of the wulfenite (PbMoO4 ) sampled from mine of Fiumarella in Calabria region (Southern Italy). Wulfenite is a rare mineral belonging to the class of minerals called molybdates and if found in large amounts it can be used for the extraction of molybdenum. In the mine of Fiumarella, in addition to primary minerals such as barite, galena, cerussite, anglesite, fluorite and chalcopyrite, wulfenite was also detected. Wulfenite crystals are bipyramidal, few microns in size and grow as single crystals that can reach 1 mm...
August 2018: Data in Brief
https://www.readbyqxmd.com/read/29899766/actual-insights-into-treatable-inborn-errors-of-metabolism-causing-epilepsy
#5
REVIEW
Mario Mastrangelo
This review offers an update on a group of inborn errors of metabolism causing severe epilepsy with the onset in pediatric age (but also other neurological manifestations such as developmental delay or movement disorders) with available effective or potentially effective treatments. The main pathogenic and clinical features and general recommendations for the diagnostic and therapeutic workup of the following disorders are discussed: vitamin B6 -dependent epilepsies, cerebral folate deficiency, congenital disorders of serine metabolism, biotinidase deficiency, inborn errors of creatine metabolism, molybdenum cofactor deficiency, and glucose transporter 1 deficiency...
January 2018: Journal of Pediatric Neurosciences
https://www.readbyqxmd.com/read/29898738/serum-concentration-of-cobalt-molybdenum-and-zinc-in-aerobic-anaerobic-and-aerobic-anaerobic-sportsmen
#6
Marcos Maynar, Francisco Llerena, Francisco Javier Grijota, Mario Pérez-Quintero, Ignacio Bartolomé, Javier Alves, María Concepción Robles, Diego Muñoz
BACKGROUND: The aim of the present study was to determine changes in the serum concentrations of trace elements Cobalt (Co), Molybdenum (Mo) and Zinc (Zn) among high-level sportsmen. METHODS: Eighty professional athletes of different metabolic modalities (aerobic, anaerobic and aerobic-anaerobic), were recruited before the beginning of their training seasons. Thirty-one sedentary participants of the same geographic area constituted the control group. Co, Mo and Zn analysis was performed by Inductively Coupled Plasma Mass Spectrometry (ICP-MS)...
June 13, 2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/29897150/molybdenum-imido-tungsten-imido-and-tungsten-oxo-alkylidene-n-heterocyclic-carbene-olefin-metathesis-catalysts
#7
Michael Rudolf Buchmeiser
This article outlines the fundamental concept to molybdenum imido, tungsten imido and tungsten oxo alkylidene N-heterocyclic carbene (NHC) catalysts for olefin metathesis. Starting from Mo(NR)(CHCMe2R')(OTf)2.DME (R = alkyl, aryl; R' = CH3, Ph; OTf = CF3SO3; DME = 1,2-dimethoxyethane), W(NR)(CHCMe2Ph)X2 (X = pyrrolide, OR'', SiPh3) and W(O)Cl2(CHCMe2Ph)(PMe2Ph)2, respectively, the neutral, pentacoordinated 16-valence electron (VE) complexes became accessible. These serve as precursors for the corresponding cationic, tetracoordinated 14-VE catalysts...
June 13, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29896961/design-of-heteronanostructures-on-mos-2-nanosheets-to-boost-no-2-room-temperature-sensing
#8
Yutong Han, Da Huang, Yujie Ma, Guili He, Jun Hu, Jing Zhang, Nantao Hu, Yanjie Su, Zhihua Zhou, Yafei Zhang, Zhi Yang
Molybdenum disulfide (MoS2 ), as a promising gas-sensing material, has gained intense interest due to the large surface-to-volume ratio, air-stability, and various active sites for functionalization. However, MoS2 -based gas sensors still suffer from low sensitivity, slow response, and weak recovery at room temperature, especially for NO2 . Fabrication heterostructures may be an effective way to modulate the intrinsic electronic properties of MoS2 nanosheets (NSs), thereby achieving high sensitivity and excellent recovery properties...
June 13, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29895766/closed-die-upsetting-of-aluminum-matrix-composites-reinforced-with-molybdenum-disulfide-nanocrystals-and-multilayer-graphene-implemented-using-the-sps-process-microstructure-evolution
#9
Marek Kostecki, Mateusz Petrus, Jarosław Woźniak, Tomasz Cygan, Andrzej Olszyna
New methods for producing composite materials such as SPS (Spark Plasma Sintering) are becoming more and more popular due to the ease of implementation in industrial conditions and the versatility of the materials used for processing. In order to fully exploit the potential of this method, modifications were proposed which consisted in the deliberate induction of deformation during the sintering process. The influence of the manufacturing method on the microstructure of aluminum alloy matrix composites reinforced with layered crystals in the form of nanoflakes was investigated...
June 12, 2018: Materials
https://www.readbyqxmd.com/read/29895373/selectivity-and-sensitivity-of-molybdenum-oxide-polycaprolactone-nanofiber-composites-on-skin-cancer-preliminary-in-vitro-and-in-vivo-implications
#10
Indrakumar Janani, Rachita Lakra, Manikantan Syamala Kiran, Purna Sai Korrapati
Cancer nanomedicine has emerged as a revolution in the last decade opening up promising strides for the cancer treatment. The major challenge in these therapeutic approaches resides in the failure of clinical trials owing to the immunological cancer microenvironment. Therefore, the success of next generation nanomedicine depends on tunable physicochemical nanomaterial design and corresponding clinical trials by integrating targeted delivery with mitigated toxicity. The present study deals with the fabrication of nanofibrous scaffold impregnated with molybdenum nanoparticles for targeted skin cancer therapeutics...
September 2018: Journal of Trace Elements in Medicine and Biology
https://www.readbyqxmd.com/read/29895368/validation-of-a-dilute-and-shoot-method-for-quantification-of-12-elements-by-inductively-coupled-plasma-tandem-mass-spectrometry-in-human-milk-and-in-cow-milk-preparations
#11
Stéphane Dubascoux, Daniel Andrey, Mario Vigo, Peter Kastenmayer, Eric Poitevin
Nutritional information about human milk is essential as early human growth and development have been closely linked to the status and requirements of several macro- and micro-elements. However, methods addressing whole mineral profiling in human milk have been scarce due in part to their technical complexities to accurately and simultaneously measure the concentration of micro- and macro-trace elements in low volume of human milk. In the present study, a single laboratory validation has been performed using a "dilute and shoot" approach for the quantification of sodium (Na), magnesium (Mg), phosphorus (P), potassium (K), calcium (Ca), manganese (Mn), iron (Fe), copper (Cu), zinc (Zn), selenium (Se), molybdenum (Mo) and iodine (I), in both human milk and milk preparations...
September 2018: Journal of Trace Elements in Medicine and Biology
https://www.readbyqxmd.com/read/29894969/trace-elements-in-wild-edible-aplysia-species-relationship-with-the-desaturation-elongation-indexes-of-fatty-acids
#12
Renato B Pereira, Agostinho A Almeida, David M Pereira, Olga Silva, Paula B Andrade, Edgar Pinto, Patrícia Valentão
The profile of essential and non-essential elements was traced in the edible sea hares Aplysia depilans Gmelin, Aplysia fasciata Poiret and Aplysia punctata Cuvier. Manganese (Mn), iron (Fe), zinc (Zn), copper (Cu) and selenium (Se) were identified as the major essential elements. Risk assessment evidenced that the levels of cadmium (Cd) and lead (Pb) did not exceed the maximum limit value established by the European Regulation, the contents of chromium (Cr), nickel (Ni) and arsenic (As) being also below the levels established by the FDA guide...
June 5, 2018: Chemosphere
https://www.readbyqxmd.com/read/29894883/contamination-of-soils-by-potentially-toxic-elements-in-the-impact-zone-of-tungsten%C3%A2-molybdenum-ore-mine-in-the-baikal-region-a-survey-and-risk-assessment
#13
Ivan Timofeev, Natalia Kosheleva, Nikolay Kasimov
Mining of mineral resources exerts strong impact on the environment and leads to irreversible changes in vegetation, soils, atmosphere, surface and ground waters. The aim of this study is to assess the modern geochemical state of soil cover in Zakamensk, a city located in Buryat Republic (Russia) and known as one of the biggest ore mining center in the former Soviet Union. The center was operating for 68 years and closed 17 years ago. Soil-geochemical survey was conducted in 2012 and included collection of 103 soil samples in Zakamensk and 27 samples in the background areas...
June 9, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29894007/pistachio-shuck-like-mose-2-c-core-shell-nanostructures-for-high-performance-potassium-ion-storage
#14
Wei Wang, Bo Jiang, Chang Qian, Fan Lv, Jianrui Feng, Jinhui Zhou, Kai Wang, Chao Yang, Yong Yang, Shaojun Guo
Potassium-ion batteries (KIBs) have recently attracted intensive attention because of the abundant potassium resources and their low cost and high safety. However, the major challenge faced by KIBs lies in the lack of stable and high-capacity materials for the intercalation/deintercalation of large-size potassium ions. A unique pistachio-shuck-like MoSe2 /C core/shell nanostructure (PMC) is synthesized herein as an advanced anode for boosting the performance of KIBs. This PMC is featured with a few layers of molybdenum selenide as the core with an expanded interlayer spacing of ≈0...
June 12, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29892398/determination-of-sulfonamides-in-milk-by-capillary-electrophoresis-with-peg-mos-2-as-a-dispersive-solid-phase-extraction-sorbent
#15
Jianxin An, Xuan Wang, Meiting Ming, Jian Li, Nengsheng Ye
A synthetic polyethylene glycol-molybdenum disulfide (PEG@MoS2 ) composite was prepared using a simple method, and the application of this material in dispersive solid-phase extraction (DSPE) was investigated for the enrichment of eight sulfonamides (SAs) in milk samples. The composite was characterized by energy dispersive spectroscopy, scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy and Brunauer-Emmett-Teller measurements. The results showed that the MoS2 synthesized in the presence of PEG has the advantage of a larger surface area and that the adsorption effect of this MoS2 was enhanced...
May 2018: Royal Society Open Science
https://www.readbyqxmd.com/read/29889623/no-x-instrument-intercomparison-for-laboratory-biomass-burning-source-studies-and-urban-ambient-measurements-in-albuquerque-new-mexico
#16
Caroline Allen, Christian M Carrico, Samantha L Gomez, Peter C Andersen, Andrew A Turnipseed, Craig J Williford, John W Birks, Dwayne Salisbury, Richard Carrion, Dan Gates, Fabian Macias, Thom Rahn, Allison C Aiken, Manvendra K Dubey
Understanding nitrogen oxides (NOx  = NO + NO2 ) measurement techniques is important as air-quality standards become more stringent, important sources change, and instrumentation develops. NOx observations are compared in two environments: source testing from the combustion of southwestern biomass fuels and urban, ambient NOx . The latter occurred in the urban core of Albuquerque, NM at an EPA NCORE site during February-March 2017, a relatively clean photochemical environment with ozone (O3 ) < 60 ppb for all but 6 hours...
June 11, 2018: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/29888909/ion-migration-studies-in-exfoliated-2d-molybdenum-oxide-via-ionic-liquid-gating-for-neuromorphic-device-applications
#17
Cheng Zhang, Pushpa Raj Pudasaini, Akinola David Oyedele, Anton V Ievlev, Liubin Xu, Amanda Vecto Haglund, Joo Hyon Noh, Anthony T Wong, Kai Xiao, Thomas Zac Ward, David Mandrus, Haixuan Xu, Olga S Ovchinnikova, Philip D Rack
The formation of an electric double layer in ionic liquid (IL) can electrostatically induce charge carriers and/or intercalate ions in and out of the lattice which can trigger a large change of the electronic, optical and magnetic properties of materials and even modify the crystal structure. We present a systematic study of ionic liquid gating of exfoliated 2D molybdenum trioxide (MoO3) devices and correlate the resultant electrical properties to the electrochemical doping via ion migration during the IL biasing process...
June 11, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29888813/latent-and-air-stable-pre-catalysts-for-the-polymerization-of-dicyclopentadiene-from-penta-to-hexacoordination-in-molybdenum-imido-alkylidene-n-heterocyclic-carbene-complexes
#18
Iris Elser, Benjamin R Kordes, Wolfgang Frey, Katharina Herz, Roman Schowner, Laura Stöhr, Hagen Altmann, Michael Rudolf Buchmeiser
The pentacoordinated, 16-valence electron (VE) Mo imido alkylidene N-heterocyclic carbene (NHC) complexes I1 - I5 and the hexacoordinated 18-VE Mo imido alkylidene NHC complexes 1 - 4, 8, 10 and 12 containing a chelating ligand have been prepared and used as thermally latent catalysts in the ring-opening metathesis polymerization (ROMP) of dicyclopentadiene (DCPD). Both 10 and 12 are the first Mo imido alkylidene complexes with a chelating alkylidene featuring a carboxylate group. Complexes I1 - I3 and I5 as well as 1 - 4 proved to be fully thermally latent in the presence of DCPD...
June 11, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29888587/hydrogen-evolution-catalyzed-by-a-molybdenum-sulfide-two-dimensional-structure-with-active-basal-planes
#19
Tong Yang, Yang Bao, Wen Xiao, Jun Zhou, Jun Ding, Yuan Ping Feng, Kian Ping Loh, Ming Yang, Shijie Wang
Molybdenum disulfide has been demonstrated as a promising catalyst for hydrogen evolution reactions (HER). However, its performance is limited by fractional active edge sites and the strong dependence on hydrogen coverage. In this study, we find an enhanced HER performance in a two-dimensional sub-stoichiometric molybdenum sulfide. Both first-principles calculations and experimental results demonstrate that the basal plane is catalytically active towards HER as evidenced by an optimum Gibbs free energy and a low reaction overpotential...
June 11, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29882885/risk-and-benefit-of-different-cooking-methods-on-essential-elements-and-arsenic-in-rice
#20
Tasila Mwale, Mohammad Mahmudur Rahman, Debapriya Mondal
Use of excess water in cooking of rice is a well-studied short-term arsenic removal technique. However, the outcome on the nutritional content of rice is not well addressed. We determined the benefit of different cooking techniques on arsenic removal and the associated risk of losing the essential elements in rice. Overall, we found 4.5%, 30%, and 44% decrease in the arsenic content of rice when cooked with rice-to-water ratios of 1:3, 1:6 ( p = 0.004), and 1:10 (parboiling; p < 0.0001), respectively. All the essential elements (except iron, selenium, and copper) incurred a significant loss when rice was cooked using the 1:6 technique: potassium (50%), nickel (44...
May 23, 2018: International Journal of Environmental Research and Public Health
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