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https://www.readbyqxmd.com/read/28544649/activation-of-co2-by-vanadium-nitrogenase
#1
Nathaniel Sickerman, Yilin Hu, Markus Walter Ribbe
The reduction of CO2 into useful products, including hydrocarbon fuels, is an ongoing area of particular interest due to efforts to mitigate buildup of this greenhouse gas. While the industrial Fischer-Tropsch process can facilitate the hydrogenation of CO2 with H2 to form short-chain hydrocarbon products under high temperatures and pressures, a desire to perform these reactions under ambient conditions has inspired the use of biological approaches. Particularly, enzymes offer insight into how to activate and reduce CO2, but only one enzyme, nitrogenase, can perform the multielectron, multiproton reduction of CO¬2 into hydrocarbons...
May 22, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28544623/amphoteric-ion-exchange-membranes-with-significantly-improved-vanadium-barrier-properties-for-all-vanadium-redox-flow-batteries
#2
Olga Nibel, Tomasz Rojek, Thomas J Schmidt, Lorenz Gubler
All-vanadium redox flow batteries (VRBs) have attracted considerable interest as promising energy storage devices which can allow the efficient utilization of renewable energy sources. The membrane, which separates the porous electrodes in a redox flow cell, is one of the key components in VRBs. High rates of cross-over of vanadium ions and water through the membrane impair the efficiency and capacity of a VRB. Thus, membranes with low permeation rate of vanadium species and water are required, also characterized by low resistance and stability in the VRB environment...
May 23, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28543976/structure-induced-switching-of-the-band-gap-charge-order-and-correlation-strength-in-ternary-vanadium-oxide-bronzes
#3
Thomas Tolhurst, Justin Andrews, Brett Leedahl, Peter Marley, Sarbajit Banerjee, Alexander Moewes
Recently, V2O5 nanowires have been synthesized as several different polymorphs, and as correlated bronzes with cations intercalated between the layers of edge- and corner-sharing VO6 octahedra. Unlike extended crystals, which tend to be plagued by substantial local variations in stoichiometry, nanowires of correlated bronzes exhibit precise charge ordering, thereby giving rise to pronounced electron correlation effects. These developments have greatly broadened the scope of research, and promise applications in several frontier electronic devices that make use of novel computing vectors...
May 21, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28541939/adsorption-kinetics-and-isotherm-of-vanadium-with-melamine
#4
Hao Peng, Zuohua Liu, Changyuan Tao
Melamine, possessing three free amino groups and three aromatic nitrogen atoms in its molecule, has great potential as an adsorbent for metal ions. We investigated three impact factors of the adsorption process: the initial pH of the vanadium solution, contact time and reaction temperature. The adsorption kinetics could be accurately described by the pseudo-second-order kinetic model. Langmuir and Freundlich models fitted well with the experimental equilibrium data, and the maximal adsorption capacity was found to be 1,428...
May 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28540962/electrochemical-evaluation-methods-of-vanadium-flow-battery-electrodes
#5
Lantao Wu, Jianshe Wang, Yi Shen, Le Liu, Jingyu Xi
Various testing methods, such as cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS), have been employed to evaluate the electrode performance of vanadium flow batteries (VFB). Due to the variations in the testing devices and characterization parameters in the literature, a number of reported results are incomparable and even sometimes contradictory. In this report, a reliable device is proposed for the electrochemical characterization of electrode materials, and the parameter selection was demonstrated to be critical for achieving reliable evaluation and reducing the effects of side reactions...
May 25, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28539734/honey-and-health-a-review-of-recent-clinical-research
#6
REVIEW
Saeed Samarghandian, Tahereh Farkhondeh, Fariborz Samini
Honey is one of the most appreciated and valued natural products introduced to humankind since ancient times. Honey is used not only as a nutritional product but also in health described in traditional medicine and as an alternative treatment for clinical conditions ranging from wound healing to cancer treatment. The aim of this review is to emphasize the ability of honey and its multitude in medicinal aspects. Traditionally, honey is used in the treatment of eye diseases, bronchial asthma, throat infections, tuberculosis, thirst, hiccups, fatigue, dizziness, hepatitis, constipation, worm infestation, piles, eczema, healing of ulcers, and wounds and used as a nutritious supplement...
April 2017: Pharmacognosy Research
https://www.readbyqxmd.com/read/28537585/v-for-vanadium
#7
Andrea Taroni
No abstract text is available yet for this article.
May 24, 2017: Nature Chemistry
https://www.readbyqxmd.com/read/28535482/multiple-metal-exposures-and-their-correlation-with-monoamine-neurotransmitter-metabolism-in-chinese-electroplating-workers
#8
Lin-Lin Wu, Wei Gong, Si-Peng Shen, Zhong-He Wang, Jia-Xi Yao, Jun Wang, Jing Yu, Rong Gao, Gang Wu
Excessive metal exposure has been recognized as one of the detrimental factors for brain damage. However, the potential adverse effects induced by heavy metals on monoamine neurotransmitter pathways remains poorly understood. Our study aimed to investigate the possible association between metal exposure and neurotransmitter metabolism. By a cross-sectional investigation, 224 electroplating workers and 213 non-electroplating exposure workers were recruited in the exposure and control groups. Metal exposure levels were analyzed using inductively-coupled plasma mass spectrometry and monoamine neurotransmitter pathway metabolites were measured by ultra-performance liquid chromatography tandem mass spectrometry in human urine samples...
April 26, 2017: Chemosphere
https://www.readbyqxmd.com/read/28534481/structural-water-engaged-disordered-vanadium-oxide-nanosheets-for-high-capacity-aqueous-potassium-ion-storage
#9
Daniel Scott Charles, Mikhail Feygenson, Katharine Page, Joerg Neuefeind, Wenqian Xu, Xiaowei Teng
Aqueous electrochemical energy storage devices using potassium-ions as charge carriers are attractive due to their superior safety, lower cost and excellent transport properties compared to other alkali ions. However, the accommodation of potassium-ions with satisfactory capacity and cyclability is difficult because the large ionic radius of potassium-ions causes structural distortion and instabilities even in layered electrodes. Here we report that water induces structural rearrangements of the vanadium-oxygen octahedra and enhances stability of the highly disordered potassium-intercalated vanadium oxide nanosheets...
May 23, 2017: Nature Communications
https://www.readbyqxmd.com/read/28530304/visualization-of-structural-evolution-and-phase-distribution-of-a-lithium-vanadium-oxide-li1-1v3o8-electrode-via-an-operando-and-in-situ-energy-dispersive-x-ray-diffraction-technique
#10
Qing Zhang, Andrea M Bruck, David C Bock, Jing Li, Varun Sarbada, Robert Hull, Eric A Stach, Kenneth J Takeuchi, Esther S Takeuchi, Amy C Marschilok
Li1+nV3O8 (n = 0-0.2) has been extensively investigated as a cathode material for Li ion batteries because of its superior electrochemical properties including high specific energy and good rate capability. In this paper, a synchrotron based energy dispersive X-ray diffraction (EDXRD) technique was employed to profile the phase transitions and the spatial phase distribution of a Li1.1V3O8 electrode during electrochemical (de)lithiation in situ and operando. As annealing temperature during the preparation of the Li1...
May 22, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28529953/bis-4-4-dimethyl-2-2-bipyridine-oxidovanadium-iv-sulfate-dehydrate-potential-candidate-for-controlling-lipid-metabolism
#11
Renata Francik, Jadwiga Kryczyk-Kozioł, Sławomir Francik, Ryszard Gryboś, Mirosław Krośniak
Vanadium is a trace element mainly connected with regulation of insulin metabolism which is particularly important in diabetes. In recent years, organic complexes of vanadium seem to be more interesting than inorganic salts. Nevertheless, the effect of vanadium on lipid metabolism is still a problematic issue; therefore, the main purpose of this study was to investigate the effect of 3 organic complexes of vanadium such as sodium (2,2'-bipyridine)oxidobisperoxovanadate(V) octahydrate, bis(2,2'-bipyridine)oxidovanadium(IV) sulfate dehydrate, and bis(4,4'-dimethyl-2,2'-bipyridine)oxidovanadium(IV) sulfate dihydrate in conjunction with high-fat as well as control diet in nondiabetes model on the following lipid parameters: total cholesterol, triglycerides, and high density lipoprotein as well as activity of paraoxonase 1...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28527917/spatial-distribution-of-vanadium-and-microbial-community-responses-in-surface-soil-of-panzhihua-mining-and-smelting-area-china
#12
Xuelong Cao, Muhe Diao, Baogang Zhang, Hui Liu, Song Wang, Meng Yang
Spatial distribution of vanadium in surface soils from different processing stages of vanadium-bearing titanomagnetite in Panzhihua mining and smelting area (China) as well as responses of microbial communities including bacteria and fungi to vanadium were investigated by fieldwork and laboratory incubation experiment. The vanadium contents in this region ranged from 149.3 to 4793.6 mg kg(-1), exceeding the soil background value of vanadium in China (82 mg kg(-1)) largely. High-throughput DNA sequencing results showed bacterial communities from different manufacturing locations were quite diverse, but Bacteroidetes and Proteobacteria were abundant in all samples...
May 17, 2017: Chemosphere
https://www.readbyqxmd.com/read/28523865/the-interstitial-carbon-of-the-nitrogenase-femo-cofactor-is-far-better-stabilized-than-previously-assumed
#13
Jörg Grunenberg
The first quantum-mechanical calculations of all relevant potential constants in both the iron-molybdenum cofactor and the iron-vanadium cofactor of nitrogenase suggest that the carbide is bound to the center of the enzyme much more strongly than hitherto assumed. Previous studies seemed to indicate a dummy function of the interstitial carbon, with a weak force constant (ca. 0.32 N cm(-1) ). Our new investigations confirm a different picture: the central carbon atom binds the iron-sulfur cluster through six covalent C-Fe bonds...
May 19, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28522243/work-function-characterization-of-directionally-solidified-lab6-vb2-eutectic
#14
Tyson C Back, Andreas K Schmid, Steven B Fairchild, John J Boeckl, Marc Cahay, Floor Derkink, Gong Chen, Ali Sayir
With its low work function and high mechanical strength, the LaB6/VB2 eutectic system is an interesting candidate for high performance thermionic emitters. For the development of device applications, it is important to understand the origin, value, and spatial distribution of the work function in this system. Here we combine thermal emission electron microscopy and low energy electron microscopy with Auger electron spectroscopy and physical vapor deposition of the constituent elements to explore physical and chemical conditions governing the work function of these surfaces...
May 10, 2017: Ultramicroscopy
https://www.readbyqxmd.com/read/28520557/first-principles-investigation-of-intrinsic-defects-and-self-diffusion-in-ordered-phases-of-v2c
#15
B J Demaske, A Chernatynskiy, S R Phillpot
The self-diffusion behavior of vanadium subcarbide (V2C) is investigated using density functional theory calculations, owing to its potential application as a diffusion barrier in nuclear applications. Three ordered V2C structures, two of which correspond to experimentally observed phases, are characterized in terms of their equilibrium structural, electronic and elastic properties. Our model for self-diffusion in V2C considers diffusion of carbon and vanadium to occur separately on each sublattice. Two sets of self-diffusion coefficients are calculated for each structure: one for vacancy-mediated diffusion of vanadium and the other for interstitial diffusion of carbon...
June 21, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28514699/profiling-of-illicit-cocaine-seized-in-china-by-icp-ms-analysis-of-inorganic-elements
#16
Cuimei Liu, Zhendong Hua, Xin Meng
For the first time in China, the inorganic element profiling of cocaine specimens was performed at the National Narcotics Laboratory. An inductive coupled plasma-mass spectrometry (ICP-MS) method was developed and validated for simultaneous analysis of 26 inorganic elements, including sodium (Na), magnesium (Mg), aluminuim (Al), potassium (K), calcium (Ca), vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), zinc (Zn), arsenic (As), selenium (Se), molybdenum (Mo), silver (Ag), cadmium (Cd), antimony (Sb), barium (Ba), lanthanum (La), cerium (Ce), thallium (Tl), lead (Pb), thorium (Th), and uranium (U) in illicit cocaine samples...
April 29, 2017: Forensic Science International
https://www.readbyqxmd.com/read/28513747/structural-and-electronic-elucidation-of-a-n-heterocyclic-silylene-vanadocene-adduct
#17
Mikko M Hänninen, Amgalanbaatar Baldansuren, Thomas Pugh
The solid and solution state structure of the vanadium(ii) N-heterocyclic silylene (NHSi) complex, [((Si)IPr)V(Cp)2] (1) is reported ((Si)IPr: 1,3-bis(2,6-diisopropylphenyl)-1,3-diaza-2-silacyclopent-4-en-2-ylidene). The electronic structure of 1 is probed using a combination of magnetic measurements, EPR spectroscopy and computational studies. The V-Si bond strength and complex forming mechanism between vanadocene and an NHSi ligand is elucidated using computational methods.
May 17, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28513686/a-tri-functional-vanadium-iv-complex-to-detect-cysteine-oxidation
#18
Agostino Cilibrizzi, Marina Fedorova, Juliet Collins, Robin Leatherbarrow, Rudiger Woscholski, Ramon Vilar
The development of effective molecular probes to detect and image the levels of oxidative stress in cells remains a challenge. Herein we report the design, synthesis and preliminary biological evaluation of a novel optical probe to monitor oxidation of thiol groups in cysteine-based phosphatases (CBPs). Following orthogonal protecting approaches we synthesised a new vanadyl complex designed to bind to CBPs. This complex is functionalised with a well-known dimedone derivative (to covalently trap sulfenic acids, SOHs) and a coumarin-based fluorophore for optical visualization...
May 17, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28501334/exchangeable-sodium-percentage-decrease-in-saline-sodic-soil-after-basic-oxygen-furnace-slag-application-in-a-lysimeter-trial
#19
Chiara Pistocchi, Giorgio Ragaglini, Valentina Colla, Teresa Annunziata Branca, Cristiano Tozzini, Lea Romaniello
The Basic Oxygen Furnace Slag results from the conversion of hot metal into steel. Some properties of this slag, such as the high pH or calcium and magnesium content, makes it suitable for agricultural use as a soil amendment. Slag application to agricultural soils is allowed in some European countries, but to date there is no common regulation in the European Union. In Italy soils in coastal areas are often affected by excess sodium, which has several detrimental effects on the soil structure and crop production...
May 10, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28500584/specific-interactions-of-antitumor-metallocenes-with-deoxydinucleoside-monophosphates
#20
Rahel P Eberle, Yvonne Hari, Stefan Schürch
Bent metallocenes Cp2MCl2 (M = Ti, V, Nb, Mo) are known to exhibit cytotoxic activity against a variety of cancer types. Though the mechanism of action is not fully understood yet, the accumulation of the metal ions in the nucleus points towards DNA as one of the primary targets. A set of eight deoxydinucleoside monophosphates was used to study the adduct yields with metallocenes and cisplatin. The binding affinities are reflected by the relative intensities of the adducts and were found to follow the order of Pt > V > Ti > Mo (no adducts were detected with Nb)...
May 12, 2017: Journal of the American Society for Mass Spectrometry
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