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Molybdenum

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https://www.readbyqxmd.com/read/29223849/subcellular-distribution-of-molybdenum-ultrastructural-and-antioxidative-responses-in-soybean-seedlings-under-excess-molybdenum-stress
#1
Shoujun Xu, Chengxiao Hu, Qiling Tan, Shiyu Qin, Xuecheng Sun
Some studies have shown that excess molybdenum (Mo) could produce toxic effects on plants. However, little is known about the subcellular distribution of Mo and cell ultrastructure within plants under excess Mo stress. Here, we comprehensively analyzed the changes of Mo distribution in subcellular fractions, cell ultrastructure and antioxidant enzymes in leaves and roots of soybean seedlings in response to excess Mo stress. The results showed that roots exhibited higher Mo accumulation than leaves at the 100 mg L-1 Mo level, about 38...
December 5, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/29222977/ultra-deep-adsorptive-desulfurization-of-fuels-on-cobalt-and-molybdenum-nanoparticles-loaded-on-activated-carbon-derived-from-waste-rubber
#2
Tawfik A Saleh, Saddam A Al-Hammadi, Abdulkadir Tanimu, Khalid Alhooshani
The role of cobalt and molybdenum nanoparticles loaded on activated carbon (AC) on the adsorptive desulfurization ability of sulfur-containing compounds was investigated under ambient conditions. The AC was first synthesized and activated, followed by incorporation of the cobalt (Co), molybdenum (Mo) and both Co and Mo nanoparticles. The adsorption activity parameters of the developed composites were determined using surface characterization and N2 physisorption techniques. The prepared composites were evaluated for simultaneous adsorption of sulfur compounds from fuels...
November 27, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29221345/a-rare-mixed-breast-cancer-of-intraductal-and-solid-papillary-with-tubular-carcinoma-histotypes-in-a-young-woman
#3
Xiaohui Zhang, Jie Shi, Yidong Zhou, Feng Mao, Yan Lin, Jinghong Guan, Zhiyong Liang, Qiang Sun
Mixed breast cancer, especially of uncommon breast cancer histotypes, is rare, limiting our understanding of the disease and influencing diagnostic and management outcomes. We report a case of mixed breast cancer, with features of intraductal and solid papillary and tubular carcinomas, which appeared in a young patient. Physical examination, ultrasonography, molybdenum target mammography, and histopathology were performed for a definitive diagnosis. Tumor resection followed by radiotherapy and adjuvant chemotherapy was selected as the therapeutic strategy, and the patient was followed up thrice post treatment...
September 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/29220156/ultrathin-n-doped-mo2c-nanosheets-with-exposed-active-sites-as-efficient-electrocatalyst-for-hydrogen-evolution-reactions
#4
Jin Jia, Tanli Xiong, Lili Zhao, Fulei Wang, Hong Liu, Renzong Hu, Jian Zhou, Weijia Zhou, Shaowei Chen
Probing competent electrocatalysts for hydrogen evolution reaction (HER) of water splitting is one of the most hopeful approach to front the energy and environmental crisis. Herein, we highlight ultrathin N-doped Mo2C nanosheets (N-Mo2C NSs) in the role of greatly efficient platinum-free-based electrocatalysts for the HER. The transformation of crystal phase and structure between MoO2 nanosheets with thickness of ~1.1 nm and N-Mo2C NSs with thickness of ~1.0 nm is detailed studied. Structural analyses make clear that the surfaces of the N-Mo2C NSs are absolutely encompassed of apical Mo atoms, hence affording an ideal catalyst prototype to expose the role of Mo atoms for the duration of HER catalysis...
December 8, 2017: ACS Nano
https://www.readbyqxmd.com/read/29219839/efficient-exfoliation-of-layered-materials-by-waste-liquor
#5
Jiheng Ding, Hongran Zhao, Yan Zheng, Qiaolei Wang, Hao Chen, Huimin Dou, Haibin Yu
Based on the unique material properties, two-dimensional (2D) nanomaterials such as graphene, molybdenum disulfide (MoS2), and boron nitride (BN) have been attracting increasing research interest. The potential of 2D materials in the form of nanoplatelets used as new materials will be important to both nanomaterials and advanced materials. Usually water is considered as the ideal dispersed medium, while the essential hydrophobicity of 2D nanoplatelets and limitation of mass production became the quite serious obstacles for the usage in various fields...
December 8, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29219159/coupling-interconnected-moo3-wo3-nanosheets-with-a-graphene-framework-as-a-highly-efficient-anode-for-lithium-ion-batteries
#6
Pengbo Wang, Zhihua Cheng, Guiqin Lv, Liangti Qu, Yang Zhao
A rationally assembled three-dimensional graphene framework coupled with interconnected molybdenum/tungsten oxide nanosheets (MoO3/WO3-GF) has been developed via a one-step template-free strategy. With the unique nanostructure, the obtained anode material not only exhibits a high reversible capacity of about 1000 mA h g-1, approaching the theoretical capacity of MoO3 and WO3 materials, but also shows excellent rate capability and cycling performance with negligible capacity attenuation after a long-time test...
December 8, 2017: Nanoscale
https://www.readbyqxmd.com/read/29218352/an-ultra-low-frictional-interface-combining-fdts-sams-with-molybdenum-disulfide
#7
Xing'an Cao, Xuehui Gan, Yitian Peng, Yongxia Wang, Xingzhong Zeng, Haojie Lang, Jinan Deng, Kun Zou
Interfacial friction is of crucial importance to ensure the friction-reducing and anti-wear properties of mechanical microstructures in micro/nanoelectromechanical systems (MEMS/NEMS). An ultra-low frictional interface combining hydrophobic 1H,1H,2H,2H-perfluorodecyltrichlorosilane (FDTS) self-assembled monolayers (SAMs) coated on an AFM tip with mechanically exfoliated molybdenum disulfide (MoS2) nanosheets deposited on a planar Si/SiO2 substrate was achieved. The FDTS SAMs/MoS2 interface between the FDTS SAMs and the MoS2 nanosheets exhibits an ultra-low friction force that is independent of the relative humidity...
December 8, 2017: Nanoscale
https://www.readbyqxmd.com/read/29216575/tuning-the-schottky-rectification-in-graphene-hexagonal-boron-nitride-molybdenum-disulfide-heterostructure
#8
Biao Liu, Yu-Qing Zhao, Zhuo-Liang Yu, Lin-Zhi Wang, Meng-Qiu Cai
It was still a great challenge to design high performance of rectification characteristic for the rectifier diode. Lately, a new approach was proposed experimentally to tune the Schottky barrier height (SBH) by inserting an ultrathin insulated tunneling layer to form metal-insulator-semiconductor (MIS) heterostructures. However, the electronic properties touching off the high performance of these heterostructures and the possibility of designing more efficient applications for the rectifier diode were not presently clear...
December 4, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29215125/large-scale-2d-3d-hybrids-based-on-gallium-nitride-and-transition-metal-dichalcogenides
#9
Kehao Zhang, Bhakti Jariwala, Jun Li, Natalie C Briggs, Baoming Wang, Dmitry Ruzmetov, Robert A Burke, Jordan O Lerach, Tony G Ivanov, Md Haque, Randall M Feenstra, Joshua A Robinson
Two and three-dimensional (2D/3D) hybrid materials have the potential to advance communication and sensing technologies by enabling new or improved device functionality. To date, most 2D/3D hybrid devices utilize mechanical exfoliation or post-synthesis transfer, which can be fundamentally different from directly synthesized layers that are compatible with large scale industrial needs. Therefore, understanding the process/property relationship of synthetic heterostructures is priority for industrially relevant material architectures...
December 7, 2017: Nanoscale
https://www.readbyqxmd.com/read/29214475/similar-but-not-the-same-metal-concentrations-in-hair-of-three-ecologically-similar-forest-dwelling-bat-species-myotis-bechsteinii-myotis-nattereri-and-plecotus-auritus
#10
Lucie Flache, Nina I Becker, Uwe Kierdorf, Sezin Czarnecki, Rolf-Alexander Düring, Jorge A Encarnação
Recently, a number of studies demonstrated the suitability of hair analysis to assess metal exposure of bats. As many bat species are endangered, such a non-destructive method is particularly suited for this taxon. The present study analyzed the levels of two non-essential (cadmium and lead) and four essential metals (copper, manganese, molybdenum, and zinc) in hairs of three ecologically similar, sympatric bat species, Bechstein's bat (Myotis bechsteinii), Natterer's bat (Myotis nattereri), and Brown long-eared bat (Plecotus auritus) from an area in Central Hesse (Germany), as well as metal concentrations in soil samples from the bats' foraging habitats...
December 6, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29212709/a-eukaryotic-nicotinate-inducible-gene-cluster-convergent-evolution-in-fungi-and-bacteria
#11
Judit Ámon, Rafael Fernández-Martín, Eszter Bokor, Antonietta Cultrone, Joan M Kelly, Michel Flipphi, Claudio Scazzocchio, Zsuzsanna Hamari
Nicotinate degradation has hitherto been elucidated only in bacteria. In the ascomycete Aspergillus nidulans, six loci, hxnS/AN9178 encoding the molybdenum cofactor-containing nicotinate hydroxylase, AN11197 encoding a Cys2/His2 zinc finger regulator HxnR, together with AN11196/hxnZ, AN11188/hxnY, AN11189/hxnP and AN9177/hxnT, are clustered and stringently co-induced by a nicotinate derivative and subject to nitrogen metabolite repression mediated by the GATA factor AreA. These genes are strictly co-regulated by HxnR...
December 2017: Open Biology
https://www.readbyqxmd.com/read/29210123/differential-modulating-effect-of-mos2-on-the-assemblies-of-amyloid-peptides
#12
Jie Wang, Lei Liu, Hongxing Zhang, Yibang Zhang, Yonghai Feng, Menglin Chen, Mingdong Dong, Daohan Ge
The abnormal fibrillogenesis of amyloid peptides such as amyloid fibril and senior amyloid plaques, is associated with the pathogenesis of many amyloid diseases. Hence, how to modulate amyloid assemblies is considered as an important field related to possible pathogenesis of some diseases. Some two-dimentional nanomaterials, i.e. grapheme oxide, tungsten disulphide, exhibit strong modulation effect on the amyloid fibrillogenesis. Herein, we investigated the modulation effect of Molybdenum Disulfide (MoS2, a kind of 2D nanomaterials) on two amyloid peptide assemblies based on the label-free techniques, including quartz crystal microbalance (QCM), AFM and CD...
December 6, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29209606/carbon-domains-on-mos2-tio2-system-via-catalytic-acetylene-oligomerization-synthesis-structure-and-surface-properties
#13
Sara Cravanzola, Federico Cesano, Fulvio Gaziano, Domenica Scarano
Carbon domains have been obtained at the surface of a MoS2/TiO2 (Evonik, P25) system via oligomerization and cyclotrimerization reactions involved in the interaction of the photoactive material with acetylene. Firstly, MoS2 nanosheets have been synthesized at the surface of TiO2, via sulfidation of a molybdenum oxide precursor with H2S (bottom-up method). Secondly, the morphology and the structure, the optical and the vibrational properties of the obtained materials, for each step of the synthesis procedure, have been investigated by microscopy and spectroscopy methods...
2017: Frontiers in Chemistry
https://www.readbyqxmd.com/read/29209000/deconvoluting-the-photonic-and-electronic-response-of-2d-materials-the-case-of-mos2
#14
Kehao Zhang, Nicholas J Borys, Brian M Bersch, Ganesh R Bhimanapati, Ke Xu, Baoming Wang, Ke Wang, Michael Labella, Teague A Williams, Md Amanul Haque, Edward S Barnard, Susan Fullerton-Shirey, P James Schuck, Joshua A Robinson
Evaluating and tuning the properties of two-dimensional (2D) materials is a major focus of advancing 2D science and technology. While many claim that the photonic properties of a 2D layer provide evidence that the material is "high quality", this may not be true for electronic performance. In this work, we deconvolute the photonic and electronic response of synthetic monolayer molybdenum disulfide. We demonstrate that enhanced photoluminescence can be robustly engineered via the proper choice of substrate, where growth of MoS2 on r-plane sapphire can yield >100x enhancement in PL and carrier lifetime due to increased molybdenum-oxygen bonding compared to that of traditionally grown MoS2 on c-plane sapphire...
December 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29208267/custom-made-pei-exfoliated-mos2-nanocomposite-ultrafiltration-membranes-for-separation-of-bovine-serum-albumin-and-humic-acid
#15
Meenakshi Sundaram Sri Abirami Saraswathi, Dipak Rana, Alagumalai Nagendran, Subbiah Alwarappan
Herein, we report the effect of the exfoliated molybdenum disulfide (eMoS2) nanosheets in improving the permeability and anti-fouling properties of the PEI ultra-filtration (UF) membrane using bovine serum albumin (BSA) and humic acid (HA) as model fouling agents. The PEI/eMoS2 nanocomposite membranes were prepared via phase inversion method using three different eMoS2 concentrations (0.5, 1 and 2wt%) designated as PEI-0.5, PEI-1 and PEI-2, respectively. Fourier transform infra-red spectroscopy employed to probe the surface functionalities on the membranes...
February 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/29208237/imaging-the-human-placental-microcirculation-with-micro-focus-computed-tomography-optimisation-of-tissue-preparation-and-image-acquisition
#16
Rosalind Pratt, J Ciaran Hutchinson, Andrew Melbourne, Maria A Zuluaga, Alex Virasami, Tom Vercauteren, Sebastien Ourselin, Neil J Sebire, Owen J Arthurs, Anna L David
Micro-CT provides 3D volume imaging with spatial resolution at the micrometre scale. We investigated the optimal human placenta tissue preparation (contrast agent, perfusion pressure, perfusion location and perfusion vessel) and imaging (energy, target material, exposure time and frames) parameters. Microfil (Flow Tech, Carver, MA) produced better fill than Barium sulphate (84.1%(±11.5%)vs70.4%(±18.02%) p = 0.01). Perfusion via umbilical artery produced better fill than via chorionic vessels (83.8%(±17...
December 2017: Placenta
https://www.readbyqxmd.com/read/29205838/enhanced-performance-of-mos2-photodetectors-by-inserting-an-ald-processed-tio2-interlayer
#17
Yusin Pak, Woojin Park, Somak Mitra, Assa Aravindh Sasikala Devi, Kalaivanan Loganathan, Yogeenth Kumaresan, Yonghun Kim, Byungjin Cho, Gun-Young Jung, Muhammad M Hussain, Iman S Roqan
2D molybdenum disulfide (MoS2 ) possesses excellent optoelectronic properties that make it a promising candidate for use in high-performance photodetectors. Yet, to meet the growing demand for practical and reliable MoS2 photodetectors, the critical issue of defect introduction to the interface between the exfoliated MoS2 and the electrode metal during fabrication must be addressed, because defects deteriorate the device performance. To achieve this objective, the use of an atomic layer-deposited TiO2 interlayer (between exfoliated MoS2 and electrode) is reported in this work, for the first time, to enhance the performance of MoS2 photodetectors...
December 4, 2017: Small
https://www.readbyqxmd.com/read/29205799/interface-engineering-with-mos2-pd-nanoparticles-hybrid-structure-for-a-low-voltage-resistive-switching-memory
#18
Xue-Feng Wang, He Tian, Hai-Ming Zhao, Tian-Yu Zhang, Wei-Quan Mao, Yan-Cong Qiao, Yu Pang, Yu-Xing Li, Yi Yang, Tian-Ling Ren
Metal oxide-based resistive random access memory (RRAM) has attracted a lot of attention for its scalability, temperature robustness, and potential to achieve machine learning. However, a thick oxide layer results in relatively high program voltage while a thin one causes large leakage current and a small window. Owing to these fundamental limitations, by optimizing the oxide layer itself a novel interface engineering idea is proposed to reduce the programming voltage, increase the uniformity and on/off ratio...
December 4, 2017: Small
https://www.readbyqxmd.com/read/29202697/genetic-diversity-and-association-mapping-of-mineral-element-concentrations-in-spinach-leaves
#19
Jun Qin, Ainong Shi, Beiquan Mou, Michael A Grusak, Yuejin Weng, Waltram Ravelombola, Gehendra Bhattarai, Lingdi Dong, Wei Yang
BACKGROUND: Spinach is a useful source of dietary vitamins and mineral elements. Breeding new spinach cultivars with high nutritional value is one of the main goals in spinach breeding programs worldwide, and identification of single nucleotide polymorphism (SNP) markers for mineral element concentrations is necessary to support spinach molecular breeding. The purpose of this study was to conduct a genome-wide association study (GWAS) and to identify SNP markers associated with mineral elements in the USDA-GRIN spinach germplasm collection...
December 4, 2017: BMC Genomics
https://www.readbyqxmd.com/read/29202242/molybdenum-oxide-cluster-anion-reactions-with-c2h4-and-h2o-cooperativity-and-chemifragmentation
#20
Manisha Ray, Richard N Schaugaard, Josey E Topolski, Jared Otto Kafader, Krishnan Raghavachari, Caroline Chick Jarrold
To probe the mechanism of sacrificial reagents in catalytic processes, product distributions from MoxOy- clusters reacting individually with C2H4 and H2O are compared with those from reactions with a C2H4 + H2O mixture, with the thermodynamics explored computationally. These molecules were chosen to model production of H2 from H2O via H2O + C2H4 → H2 + CH3CHO, mediated by MoxOy- clusters. H2O is known to sequentially oxidize MoxOy- suboxide clusters while producing H2, resulting in less reactive clusters...
December 4, 2017: Journal of Physical Chemistry. A
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