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https://www.readbyqxmd.com/read/28821464/multi-elemental-nanoparticle-exposure-after-tantalum-component-failure-in-hip-arthroplasty-in-depth-analysis-of-a-single-case
#1
Janosch Schoon, Sven Geißler, Juliane Traeger, Andreas Luch, Jutta Tentschert, Giorgio Perino, Frank Schulze, Georg N Duda, Carsten Perka, Anastasia Rakow
Porous tantalum components are widely used for complex acetabular reconstructions in revision hip arthroplasty. Multiple other metal alloys such as titanium-aluminum-vanadium or cobalt-chromium-molybdenum are principally used in artificial joint setups. We report a case of tantalum component failure being both cause and effect of a multiple metal exposure. Our aims were to assess and to characterize associated particle exposure and biological consequences. Metal level quantification revealed substantial in vivo exposure to particulate and dissociated tantalum, zirconium, chromium, cobalt, molybdenum, titanium, aluminum and vanadium in periprosthetic compartments...
August 16, 2017: Nanomedicine: Nanotechnology, Biology, and Medicine
https://www.readbyqxmd.com/read/28820219/mo-doped-ni2p-nanowire-arrays-an-efficient-electrocatalyst-for-the-hydrogen-evolution-reaction-with-enhanced-activity-at-all-ph-values
#2
Yiqiang Sun, Lifeng Hang, Qi Shen, Tao Zhang, Huilin Li, Xiaomin Zhang, Xianjun Lyu, Yue Li
We report the successful synthesis of Mo doped Ni2P nanowires (NWs) on a Ni foam (NF) substrate by a two-step strategy, which could be used as an efficient and stable hydrogen evolution reaction (HER) electrocatalyst over the whole pH range (0-14). Electrochemical investigations demonstrated that Mo doping made the catalytic activity of Ni2P significantly enhanced. To achieve a current density of 10 mA cm(-2), Mo-Ni2P NWs/NF required an overpotential of 67 mV in acidic solution, 78 mV in alkaline solution and 84 mV in neutral solution...
August 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28820214/mediated-water-electrolysis-in-biphasic-systems
#3
Micheál D Scanlon, Pekka Peljo, Lucie Rivier, Heron Vrubel, Hubert H Girault
The concept of efficient electrolysis by linking photoelectrochemical biphasic H2 evolution and water oxidation processes in the cathodic and anodic compartments of an H-cell, respectively, is introduced. Overpotentials at the cathode and anode are minimised by incorporating light-driven elements into both biphasic reactions. The concepts viability is demonstrated by electrochemical H2 production from water splitting utilising a polarised water-organic interface in the cathodic compartment of a prototype H-cell...
August 18, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28816178/plasmon-modes-of-bilayer-molybdenum-disulfide-a-density-functional-study
#4
Zahra Torbatian, Reza Asgari
We explore the collective electronic excitations of bilayer molybdenum disulfide (MoS2 ) using the density functional theory together with the random phase approximation. The many-body dielectric function and electron energy-loss spectra are calculated using an ab initio based model involving material-realistic physical properties. The electron energy-loss function of bilayer MoS2 system is found to be sensitive to either electron or hole doping and it is owing to the fact that the Kohn-Sham band dispersions are not symmetric for energies above and below the zero Fermi level...
August 17, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28816041/contact-engineering-of-molybdenum-ditelluride-field-effect-transistors-through-rapid-thermal-annealing
#5
Jiancui Chen, Zhihong Feng, Shuangqing Fan, Sigang Shi, Yuchen Yue, Wanfu Shen, Yuan Xie, Enxiu Wu, Chongling Sun, Jing Liu, Hao Zhang, Wei Pang, Dong Sun, Wei Feng, Yiyu Feng, Sen Wu, Daihua Zhang
Understanding and engineering the interface between metal and two-dimensional materials are of great importance to the research and development of Nano-electronics. In many cases the interface of meal and 2D materials can dominate the transport behavior of the devices. In this study, we focus on the metal contacts of MoTe2 (molybdenum ditelluride) FETs (field effect transistors) and demonstrate how to use post annealing treatment to modulate their transport behaviors in a controlled manner. We have also carried out low temperature and transmission electron microscopy studies to understand the mechanisms behind the prominent effect of the annealing process...
August 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28815926/catalytic-conversion-of-dinitrogen-into-ammonia-under-ambient-reaction-conditions-by-using-proton-source-from-water
#6
Yoshiaki Tanabe, Kazuya Arashiba, Kazunari Nakajima, Yoshiaki Nishibayashi
Molybdenum-catalyzed conversion of molecular dinitrogen into ammonia under ambient reaction conditions has been achieved by using a proton source generated in situ from the ruthenium-catalyzed oxidation of water in combination with visible light and a photosensitizer. The preset reaction system is considered as a new model for the nitrogen fixation by photosynthetic bacteria.
August 17, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28815807/molybdenum-oxides-from-fundamentals-to-functionality
#7
REVIEW
Isabela Alves de Castro, Robi Shankar Datta, Jian Zhen Ou, Andres Castellanos-Gomez, Sharath Sriram, Torben Daeneke, Kourosh Kalantar-Zadeh
The properties and applications of molybdenum oxides are reviewed in depth. Molybdenum is found in various oxide stoichiometries, which have been employed for different high-value research and commercial applications. The great chemical and physical characteristics of molybdenum oxides make them versatile and highly tunable for incorporation in optical, electronic, catalytic, bio, and energy systems. Variations in the oxidation states allow manipulation of the crystal structure, morphology, oxygen vacancies, and dopants, to control and engineer electronic states...
August 16, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28812883/activation-of-molecular-oxygen-by-a-molybdenum-iv-imido-compound
#8
Niklas Zwettler, Nidhi Grover, Ferdinand Belaj, Karl Kirchner, Nadia C Mösch-Zanetti
Activation of molecular dioxygen at a molybdenum(IV) imido compound led to the isolation and full characterization of a remarkably stable transition-metal imidoperoxido complex.
August 16, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28812871/high-performance-porous-molybdenum-oxynitride-based-fiber-supercapacitors
#9
Dan Ruan, Rui Lin, Kui Jiang, Xiang Yu, Yaofeng Zhu, Yaqin Fu, Zilong Wang, He Yan, Wenjie Mai
Scalable manufacturing of flexible, fiber-shaped energy storage devices has enabled great technological advances in wearable and portable technology. Replacing inefficient oxides with inexpensive and high-performance oxynitrides with more favourable 3D structures is critical if the practical applications of these technologies are to be realised. Here we developed a facile and controllable approach for the synthesis of 3D porous micropillars of molybdenum oxynitride, which exhibit high conductivity, robust stability and excellent energy storage properties...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28812754/towards-well-defined-mos2-nanoribbons-on-a-large-scale
#10
Ruifeng Qi, Shanling Wang, Minxiang Wang, Wentao Liu, Zhihui Yan, Xiaofeng Bi, Qingsong Huang
High quality molybdenum dioxide plates are engineered as templates for epitaxial growth of well-defined MoS2 nanoribbons (MNRs). The obtained MNRs possess prominent ferromagnetism, suggesting edge zigzag topologies. Our findings have opened an alternative route to large-scale synthesis of well-defined 1D materials.
August 16, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28811024/aptamer-induced-multicoloured-au-ncs-mos2-switch-on-fluorescence-resonance-energy-transfer-biosensor-for-dual-color-simultaneous-detection-of-multiple-tumor-markers-by-single-wavelength-excitation
#11
Shenghao Xu, Xiuying Feng, Teng Gao, Gufan Liu, Yaning Mao, Jiehua Lin, Xijuan Yu, Xiliang Luo
An aptamer induced "switch on" fluorescence resonance energy transfer (FRET) biosensor for the simultaneous detection of multiple tumor markers (e.g., AFP and CEA) combining molybdenum disulfide (MoS2) nanosheets with multicolored Au NCs by a single excitation was developed for the first time. Here, AFP aptamer functionalized green colored Au NCs (510 nm) and CEA aptamer functionalized red colored Au NCs (650 nm) are used as energy donors, while MoS2 is used as energy receptor. On the basis of recording the change of the recovered fluorescence intensity at 510 nm and 650 nm upon the addition of targets CEA and AFP, these two tumor markers can be simultaneously quantitatively detected, with detection limits of 0...
August 29, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28806647/mechanical-reinforcement-of-bioceramics-scaffolds-via-fracture-energy-dissipation-induced-by-sliding-action-of-mos2-nanoplatelets
#12
Cijun Shuai, Hang Sun, Chengde Gao, Pei Feng, Wang Guo, Youwen Yang, Mingchun Zhao, Sheng Yang, Fulai Yuan, Shuping Peng
The inherent brittleness of bioceramics restricts their applications in load bearing implant, although they possess good biocompatibility and bioactivity. In this study, molybdenum disulfide nanoplatelets (MSNPs) were used to reinforce bioceramics (Mg2SiO4/CaSiO3) scaffolds fabricated by selective laser sintering (SLS). The fracture mode of scaffolds was transformed from transgranular to mixed trans- and intergranular. It could be explained that MSNPs could slide easily due to their weak interlayer van der Waals interactions and provide elastic deformation due to their high elastic modulus...
July 20, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28806068/in-situ-atomic-scale-studies-of-the-formation-of-epitaxial-pt-nanocrystals-on-monolayer-molybdenum-disulfide
#13
Shanshan Wang, Hidetaka Sawada, Qu Chen, Grace G D Han, Christopher Allen, Angus I Kirkland, Jamie H Warner
Pt-nanocrystal:MoS2 hybrid materials have promising catalytic properties for hydrogen evolution, and understanding their detailed structures at the atomic scale is crucial to further development. Here, we use an in situ heating holder in an aberration-corrected transmission electron microscope to study the formation of Pt nanocrystals directly on the surface of monolayer MoS2 from a precursor on heating to 800 °C. Isolated single Pt atoms and small nanoclusters are observed after in situ heating, with two types of preferential alignment between the Pt nanocrystals and the underlying monolayer MoS2...
August 14, 2017: ACS Nano
https://www.readbyqxmd.com/read/28805962/medicago-truncatula-molybdate-transporter-type-1-mtmot1-3-is-a-plasma-membrane-molybdenum-transporter-required-for-nitrogenase-activity-in-root-nodules-under-molybdenum-deficiency
#14
Manuel Tejada-Jiménez, Patricia Gil-Díez, Javier León-Mediavilla, Jiangqi Wen, Kirankumar S Mysore, Juan Imperial, Manuel González-Guerrero
Molybdenum, as a component of the iron-molybdenum cofactor of nitrogenase, is essential for symbiotic nitrogen fixation. This nutrient has to be provided by the host plant through molybdate transporters. Members of the molybdate transporter family Molybdate Transporter type 1 (MOT1) were identified in the model legume Medicago truncatula and their expression in nodules was determined. Yeast toxicity assays, confocal microscopy, and phenotypical characterization of a Transposable Element from Nicotiana tabacum (Tnt1) insertional mutant line were carried out in the one M...
August 14, 2017: New Phytologist
https://www.readbyqxmd.com/read/28804261/the-role-of-molybdenum-in-suppressing-cold-dwell-fatigue-in-titanium-alloys
#15
Adam J Ready, Peter D Haynes, Blazej Grabowski, David Rugg, Adrian P Sutton
We test a hypothesis to explain why Ti-6242 is susceptible to cold dwell fatigue (CDF), whereas Ti-6246 is not. The hypothesis is that, in Ti-6246, substitutional Mo-atoms in α-Ti grains trap vacancies, thereby limiting creep relaxation. In Ti-6242, this creep relaxation enhances the loading of grains unfavourably oriented for slip and they subsequently fracture. Using density functional theory to calculate formation and binding energies between Mo-atoms and vacancies, we find no support for the hypothesis...
July 2017: Proceedings. Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28802272/transcriptional-analysis-of-an-ammonium-excreting-strain-of-azotobacter-vinelandii-deregulated-for-nitrogen-fixation
#16
Brett M Barney, Mary H Plunkett, Velmurugan Natarajan, Florence Mus, Carolann M Knutson, John W Peters
Biological nitrogen fixation is accomplished by a diverse group of organisms known as diazotrophs, and requires the function of the complex metalloenzyme nitrogenase. Nitrogenase and many of the accessory proteins required for proper cofactor biosynthesis and incorporation into the enzyme have been characterized, but a complete picture of the reaction mechanism and key cellular changes that accompany biological nitrogen fixation remain to be fully elucidated. Studies have revealed that specific disruptions to the anti-activator encoding gene nifL result in the deregulation of the nif transcriptional activator NifA in the nitrogen-fixing bacterium Azotobacter vinelandii, triggering the production of extracellular ammonium levels approaching 30 mM during the stationary phase of growth...
August 11, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28801597/mos2-rgo-nanoflakes-as-high-performance-anode-materials-in-sodium-ion-batteries
#17
Ruxing Wang, Shu Gao, Kangli Wang, Min Zhou, Shijie Cheng, Kai Jiang
A simple one-pot hydrothermal method is developed for fabrication of MoS2@rGO nanoflakes using the economical MoO3 as the molybdenum source. Benefiting from the unique nanoarchitecture, high MoS2 loading (90.3 wt%) and the expanded interlayer spacing, the as-prepared MoS2@rGO nanoflakes exhibit greatly enhanced sodium storage performances including a high reversible specific capacity of 441 mAh g(-1) at a current density of 0.2 A g(-1), high rate capability, and excellent capacity retention of 93.2% after 300 cycles...
August 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28801050/electron-transfer-through-arsenite-oxidase-insights-into-rieske-interaction-with-cytochrome-c
#18
Cameron Watson, Dimitri Niks, Russ Hille, Marta Vieira, Barbara Schoepp-Cothenet, Alexandra T Marques, Maria João Romão, Teresa Santos-Silva, Joanne M Santini
Arsenic is a widely distributed environmental toxin whose presence in drinking water poses a threat to >140 million people worldwide. The respiratory enzyme arsenite oxidase from various bacteria catalyses the oxidation of arsenite to arsenate and is being developed as a biosensor for arsenite. The arsenite oxidase from Rhizobium sp. str. NT-26 (a member of the Alphaproteobacteria) is a heterotetramer consisting of a large catalytic subunit (AioA), which contains a molybdenum centre and a 3Fe-4S cluster, and a small subunit (AioB) containing a Rieske 2Fe-2S cluster...
August 8, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28800964/the-effect-of-metal-ions-released-from-different-dental-implant-abutment-couples-on-osteoblast-function-and-secretion-of-bone-resorbing-mediators
#19
Ghada O Alrabeah, Peter Brett, Jonathan C Knowles, Haralampos Petridis
OBJECTIVES: The etiology of the reduced marginal bone loss observed around platform-switched implant-abutment connections is not clear but could be related to the release of variable amounts of corrosion products. The present study evaluated the effect of different concentrations of metal ions released from different implant abutment couples on osteoblastic cell viability, apoptosis and expression of genes related to bone resorption. METHODS: Osteoblastic cells were exposed to five conditions of culture media prepared containing metal ions (titanium, aluminum, vanadium, cobalt, chromium and molybdenum) in different concentrations representing the amounts released from platform-matched and platform-switched implant-abutment couples as a result of an earlier accelerated corrosion experiment...
August 4, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28799602/ultra-sensitive-dna-sensing-of-a-prostate-specific-antigen-based-on-2d-nanosheets-in-live-cells
#20
Namasivayam Dhenadhayalan, Kanchan Yadav, Muthu Irulappan Sriram, Hsin-Lung Lee, King-Chuen Lin
Herein, we report ultra-sensitive sensing of a prostate-specific antigen (PSA), which is used as a biomarker to detect prostate cancer, using a molybdenum series (MoO3, MoS2, and MoSe2) of two-dimensional nanosheets (2D NSs). Moreover, the design of a 2D NS-based PSA aptamer sensor system was demonstrated based on a fluorescence turn-on mechanism in the presence of a target. The 2D NSs acted as an excellent sensing platform in which the PSA aptamer was adsorbed on the NSs and subsequent energy transfer between them led to fluorescence quenching of the aptamer...
August 11, 2017: Nanoscale
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