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Mengwei Yuan, Selmihan Sahin, Rong Cai, Sofiene Abdellaoui, David Hickey, Shelley Minteer, Ross D Milton
Increasing greenhouse gas emissions has resulted in greater motivation to find novel carbon dioxide (CO2) reduction technologies, where the reduction of CO2 to valuable chemical commodities is desirable. Molybdenum-dependent formate dehydrogenase (Mo-FDH) from Escherichia coli is a metalloenzyme that is able to interconvert formate and CO2. We describe a low-potential redox polymer, synthesized by a facile method, that employs cobaltocene (grafted to poly(allylamine), Cc-PAA) to simultaneously mediate electrons to Mo-FDH and immobilize Mo-FDH at the surface of a carbon electrode...
April 14, 2018: Angewandte Chemie
Lidhiya Alexander, Pradeep Babu Kommi, Nandakumar Arani, S Hanumanth, V Vijay Kumar, R Senkutvan Sabapathy
Aim: The aim of this study was to evaluate the kinetic frictional properties of colored titanium molybdenum alloy (TMA) archwires (purple-coated TMA and honey dew-coated TMA) and the regular TMA archwires. Materials and Methods: The experiment comprised of three groups, Group I - Regular TMA archwires, Group II - Purple-coated TMA archwires, Group III - Honey dew-coated TMA wires involving 21 samples each that were evaluated for their frictional properties using Instron Universal Testing Machine...
March 2018: Indian Journal of Dental Research: Official Publication of Indian Society for Dental Research
M D Siao, W C Shen, R S Chen, Z W Chang, M C Shih, Y P Chiu, C-M Cheng
Because the surface-to-volume ratio of quasi-two-dimensional materials is extremely high, understanding their surface characteristics is crucial for practically controlling their intrinsic properties and fabricating p-type and n-type layered semiconductors. Van der Waals crystals are expected to have an inert surface because of the absence of dangling bonds. However, here we show that the surface of high-quality synthesized molybdenum disulfide (MoS2 ) is a major n-doping source. The surface electron concentration of MoS2 is nearly four orders of magnitude higher than that of its inner bulk...
April 12, 2018: Nature Communications
Jitendra K Behera, Xilin Zhou, Alok Ranjan, Robert E Simpson
The objective of this work is to demonstrate the usefulness of fractional factorial design for optimising the crystal quality of chalcogenide van der Waals (vdW) crystals. We statistically analyse the growth parameters of highly c-axis oriented Sb2 Te3 crystals and Sb2 Te3 -GeTe phase change vdW heterostructure superlattices. The statistical significance of the growth parameters of temperature, pressure, power, buffer materials, and buffer layer thickness was found by fractional factorial design and response surface analysis...
April 13, 2018: ACS Applied Materials & Interfaces
Akira Nordmeier, Augustus Merwin, Donald F Roeper, Dev Chidambaram
The production of nanoparticles through biosynthesis is a reliable, non-toxic, and sustainable alternative to conventional chemical and physical methods of production. While noble metals, such as palladium, gold, and silver, have been formed via bioreduction, biologically-induced reduction of electroactive elements to a metallic state has not been reported previously. Herein, we report the reduction of an electroactive element, molybdenum, via microbial reduction using Clostridium pasteurianum. C. pasteurianum was able to reduce 88% of the added Mo6+ ions...
February 13, 2018: Chemosphere
Binquan Luan, Ruhong Zhou
The effective transport of a single-stranded DNA (ssDNA) molecule through a solid-state nanopore is essential to the future success of high-throughput and low-cost DNA sequencing. Compatible with current electric sensing technologies, here, we propose and demonstrate by molecular dynamics simulations the ssDNA transport through a quasi-two-dimensional nanopore in a heterostructure stacked together with different 2D materials, such as graphene and molybdenum disulfide (MoS2 ). Due to different chemical potentials, U, of DNA bases on different 2D materials, it is energetically favorable for a ssDNA molecule to move from the low- U MoS2 surface to the high- U graphene surface through a nanopore...
April 12, 2018: ACS Nano
Ida Vaa Johnsen, Espen Mariussen, Øyvind Voie
The Norwegian Armed Forces' shooting ranges contain contamination by metals such as lead (Pb) and copper (Cu) and are often used as grazing pastures for livestock. To determine whether the sheep were at risk from grazing at a shooting range in Nord-Trøndelag (the Leksdalen shooting field), a study was conducted wherein the aim was to determine the amount of soil the sheep were eating, the accumulation of Cu and Pb in the livers of lambs grazing on the shooting ranges, and the accumulation of Pb and Cu in the grass...
April 11, 2018: Environmental Science and Pollution Research International
Florence Mus, Alexander B Alleman, Natasha Pence, Lance C Seefeldt, John W Peters
Most biological nitrogen fixation (BNF) results from the activity of the molybdenum nitrogenase (Mo-nitrogenase, Nif), an oxygen-sensitive metalloenzyme complex found in all known diazotrophs. Two alternative forms of nitrogenase, the vanadium nitrogenase (V-nitrogenase, Vnf) and the iron-only nitrogenase (Fe-only nitrogenase, Anf) have also been identified in the genome of some organisms that encode for Nif. It has been suggested that alternative nitrogenases were responsible for N2-fixation on early Earth because oceans were depleted of bioavailable Mo...
April 9, 2018: Metallomics: Integrated Biometal Science
Qiuyun Zhang, Hu Li, Song Yang
Mesoporous Ti-Mo bi-metal oxides with various titanium-molybdenum ratios were successfully fabricated via a facile approach by using stearic acid as a low-cost template agent. thermal gravity (TG) /differential scanning calorimetry (DSC) analysis, X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, nitrogen adsorption-desorption isotherm, NH3 temperature-programmed desorption (NH3 -TPD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) measurements indicated these materials possessing mesoporous structure, sufficient pore size and high acid intensity...
April 9, 2018: Journal of Oleo Science
Dongzhi Zhang, Xin Fan, Aijun Yang, Xiaoqi Zong
In this paper, we fabricated a high-performance ethanol sensor using layer-by-layer self-assembled urchin-like alpha-iron oxide (α-Fe2 O3 ) hollow microspheres/molybdenum disulphide (MoS2 ) nanosheets heterostructure as sensitive materials. The nanostructural, morphological, and compositional properties of the as-prepared α-Fe2 O3 /MoS2 heterostructure were characterized by X-ray diffraction (XRD), energy dispersive spectrometer (EDS), scanning electron microscopy (SEM), transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS), which confirmed its successful preparation and rationality...
March 30, 2018: Journal of Colloid and Interface Science
Nathan D Wallace, Anna V Ceguerra, Andrew J Breen, Simon P Ringer
Atom probe tomography is a powerful microscopy technique capable of reconstructing the 3D position and chemical identity of millions of atoms within engineering materials, at the atomic level. Crystallographic information contained within the data is particularly valuable for the purposes of reconstruction calibration and grain boundary analysis. Typically, analysing this data is a manual, time-consuming and error prone process. In many cases, the crystallographic signal is so weak that it is difficult to detect at all...
February 23, 2018: Ultramicroscopy
Lei Zhang, Jing Zhang
By introduction of Mo metal species (molybdenum-based polyoxometalates) into the Cu-MOF as co-precursor, molybdenum carbide nanosphere (Mox C@C) was prepared via a simple calcining routine and a further etching the metallic Cu process. The obtained Mox C@C showed a unique structure where well-dispersed Mox C nanoparticles (NPs) were encapsulated in porous carbon matrix. As-fabricated novel 3D porous architecture Mox C@C nanosphere exhibited a potent and persistent electro-oxidation behavior followed by well-separated oxidation peaks (peak to peak voltage is about 350 mV) toward adenine (A) and guanine (G) by differential pulse voltammetry (DPV)...
March 29, 2018: Biosensors & Bioelectronics
Marcos Maynar, Diego Muñoz, Javier Alves, Gema Barrientos, Francisco Javier Grijota, María Concepción Robles, Francisco Llerena
The aim of the present study was to determine changes occurring in serum and urine concentrations of essential trace elements with proven essentiality (molybdenum, selenium, and zinc) as a result of performing an acute physical activity until exhaustion in middle- and long-distance runners who live in the same area of Extremadura (Spain). Twenty-one Spanish national middle- and long-distance runners and 26 sedentary students of a similar age were recruited for the study. Both groups ran on a treadmill until exhaustion, starting at a speed of 10 and 8 km/h, respectively, and increasing the speed at 1 km/h every 400 m, without modifying the slope, always within the recommended parameters...
April 5, 2018: Biological Trace Element Research
Alexander J Heyer, Philip J Shivokevich, Shelby L Hooe, Kevin D Welch, W Dean Harman, Charles W Machan
The large-scale synthesis of the scorpionate ligand Ttz (hydrotris(1,2,4-triazol-1-yl)borate) is reported as well as syntheses of Group VI complexes K[M(L)(CO)3] and M(L)(NO)(CO)2 (L = Ttz or Tp (hydrotris(pyrazol-1-yl)borate), M = Mo or W). The redox characteristics of the metal in these Ttz complexes are shown to be reversibly modulated by interactions between the exo-4-N lone pairs of the triazolyl rings and Brønsted or Lewis acids. The basicity of the scorpionate ligand in [M(Ttz)(CO)3]- is quantified (pKaH2O values range from 1...
April 6, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Alexander Epping, Luca Banszerus, Johannes Guettinger, Luisa Krueckeberg, Kenji Watanabe, Takashi Taniguchi, Fabian Hassler, Bernd Beschoten, Christoph Stampfer
We present a device scheme to explore mesoscopic transport through molybdenum disulfide (MoS<sub>2</sub>) constrictions using photodoping. The devices are based on van-der-Waals heterostructures where few-layer MoS<sub>2</sub> flakes are partially encapsulated by hexagonal boron nitride (hBN) and covered by a few-layer graphene flake to fabricate electrical contacts. Since the as-fabricated devices are insulating at low temperatures, we use photo-induced remote doping in the hBN substrate to create free charge carriers in the MoS<sub>2</sub> layer...
April 5, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Dominik Andrzejewski, Matthias Marx, Oliver Pfingsten, Annika Grundmann, Holger Kalisch, Andrei Vescan, Michael Heuken, Tilmar Kuemmell, Gerd Bacher
Fabrication of transition metal dichalcogenides (TMDC) via metalorganic chemical vapor deposition (MOCVD) represents one of the most attractive routes to large-scale 2D material layers. Although good homogeneity and electrical conductance have been reported recently, the relation between growth parameters and photoluminescence intensity - one of the most important parameter for optoelectronic applications - has not yet been discussed for MOCVD TMDCs. In this work, MoS<sub>2</sub> is grown via MOCVD on sapphire (0001) substrates using molybdenum hexacarbonyl (Mo(CO)<sub>6</sub>) and di-tert-butyl sulphide (DTBS) as precursor materials...
April 5, 2018: Nanotechnology
Xing Zhang, Yongye Liang
Molybdenum disulfide (MoS2 )-based materials have been recently identified as promising electrocatalysts for hydrogen evolution reaction (HER). However, little work has been done to improve the catalytic performance of MoS2 toward HER in alkaline electrolytes, which is more suitable for water splitting in large-scale applications. Here, it is reported that the hybridization of 0D nickel hydr(oxy)oxide nanoparticles with 2D metallic MoS2 nanosheets can significantly enhance the HER activities in alkaline and neutral electrolytes...
February 2018: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Shao-Ming Wang, Philip R Taylor, Jin-Hu Fan, Ruth M Pfeiffer, Mitchell H Gail, He Liang, Gwen A Murphy, Sanford M Dawsey, You-Lin Qiao, Christian C Abnet
Background: A beneficial effect of supplementation with selenium, vitamin E, and beta-carotene was observed on total and cancer mortality in a Chinese population, and it endured for 10 years postintervention, but longer durability is unknown. Methods: A randomized, double-blind, placebo-controlled trial was conducted in Linxian, China, from 1986 to 1991; 29 584 residents age 40 to 69 years received daily supplementations based on a factorial design: Factors A (retinol/zinc), B (riboflavin/niacin), C (vitamin C/molybdenum), and/or D (selenium/vitamin E/beta-carotene), or placebo for 5...
April 3, 2018: Journal of the National Cancer Institute
Danhong Huang, Andrii Iurov, Godfrey Gumbs
Induced polarization by Dirac electrons in double-layer graphene can affect hybridization of radiative and evanescent fields. Electron back action appears as a localized optical field to modify an incident surface-plasmon-polariton (SPP) evanescent field. This leads to high sensitivity (beyond the diffraction limit) to local environments and provides a scrutiny tool for molecules or protein selectively bounded with carbon. A scattering matrix with frequencies around the surface-plasmon (SP) resonance supports this scrutiny tool and exhibits sensibly the increase, decrease and even a full suppression of the polarization field in the vicinity of a conducting surface for longer SPP wavelengthes...
April 4, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Anne Postler, Franziska Beyer, Cornelia Lützner, Eric Tille, Jörg Lützner
PURPOSE: Patients with known hypersensitivity to metals often require hypoallergenic TKA implants. Coating of a standard implant is a common solution, and although in vitro tests have demonstrated reduction of polyethylene wear for these coatings, it is still unknown whether these implants have any clinical benefit. This study was initiated to investigate metal ion concentrations, knee function and patient-reported outcome (PRO) after coated and uncoated TKA. METHODS: One hundred and twenty-two (122) patients were randomized to receive a coated or a standard TKA and, after exclusions, 59 patients were included in each group...
April 3, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
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