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Murat Çanlı
This study investigates aberrations caused by barium and vanadium on meristematic cells of Lens culinaris Medik. Barium and vanadium ions at various concentrations (0.05 M, 0.1 M, 0.25 M, 0.5 M, and 1.0 M) were exposed to the seeds of the plant at fixed time interval (12 h). After seedlings, with a microscopic examination images were captured about the root tips. Those images showed that several abnormalities occurred on the plant such as chromosome breakings, chromosome dispersion, bridge chromosome, chromosome adherence, ring chromosome...
May 18, 2018: Ecotoxicology and Environmental Safety
Zhenzhong Lu, Harry G W Godfrey, Ivan da Silva, Yongqiang Cheng, Mathew Savage, Pascal Manuel, Svemir Rudić, Anibal J Ramirez-Cuesta, Sihai Yang, Martin Schröder
Fine tuning of host-guest supramolecular interactions in porous systems enables direct control over the properties of functional materials. We report here a modification of hydrogen bonding and its effect on guest binding in a pair of redox-active metal-organic frameworks (MOFs). Oxidation of MFM-300(VIII ) {[VIII2(OH)2 (L)], LH4 = biphenyl-3,3',5,5'-tetracarboxylic acid} is accompanied by deprotonation of the bridging hydroxyl groups to afford isostructural MFM-300(VIV ), [VIV2O2 (L)]. The precise role of the hydroxyl groups, O -carboxylate centres and π-π interactions in the supramolecular binding of C2 hydrocarbons in these materials has been determined using neutron diffraction and inelastic neutron scattering, coupled with DFT modelling...
April 7, 2018: Chemical Science
Luis Escalera-Moreno, José J Baldoví, Alejandro Gaita-Ariño, Eugenio Coronado
Very recently the closely related fields of molecular spin qubits, single ion magnets and single atom magnets have been shaken by unexpected results. We have witnessed a jump in the phase memory times of spin qubits from a few microseconds to almost a millisecond in a vanadium complex, magnetic hysteresis up to 60 K in a dysprosium-based magnetic molecule and magnetic memory up to 30 K in a holmium atom deposited on a surface. With single-molecule magnets being more than two decades old, this rapid improvement in the physical properties is surprising and its explanation deserves urgent attention...
April 7, 2018: Chemical Science
Shaun M K McKinnie, Zachary D Miles, Bradley S Moore
Vanadium-dependent haloperoxidases (VHPOs) are fascinating enzymes that facilitate electrophilic halogen incorporation into electron-rich substrates, simply requiring vanadate, a halide source, and cosubstrate hydrogen peroxide for activity. Initially characterized in fungi and red algae, VHPOs were long believed to have limited regio-, chemo-, and enantioselectivity in the production of halogenated metabolites. However, the recent discovery of homologues in the biosynthetic gene clusters of the stereoselectively halogenated meroterpenoids from marine-derived Streptomyces bacteria has revised this paradigm...
2018: Methods in Enzymology
Mohamed Shaker S Adam, Hany Elsawy
New series of oxo-vanadium N-salicyledieneamino acid Schiff base complexes are synthesized and characterized. They are synthesized from the reaction of sodium salicylaldehyde-5-sulfonate, some amino acids, alanine (VOHL1), leucine (VOHL2) or glycine (VOHL3) in an aqueous media, and leucine (VOHLpy1) or tryptophan (VOHLpy2) in pyridine with vanadyl acetylacetonate. The complexes are characterized by EA, TGA, IR, UV-Visible and mass spectra, conductivity and magnetic measurements. The biological activity of the VO-complexes shows that VOHL1, VOHL2 and VOHL3 exhibit anti-proliferative effect and may be used as anticancer drugs...
May 4, 2018: Journal of Photochemistry and Photobiology. B, Biology
Xingyun Hu, Yuyan Yue, Xianjia Peng
Batch experiments were performed to derive the rate laws for the proton-promoted dissolution of the main vanadium (III, IV and V) oxides at pH 3.1-10.0. The release rates of vanadium are closely related to the aqueous pH, and several obvious differences were observed in the release behavior of vanadium from the dissolution of V2 O5 and vanadium(III, IV) oxides. In the first 2hr, the release rates of vanadium from V2 O3 were r=1.14·([H+ ])0.269 at pH 3.0-6.0 and r=0.016·([H+ ])-0.048 at pH 6.0-10.0; the release rates from VO2 were r=0...
May 2018: Journal of Environmental Sciences (China)
Meena Marafi, Mohan S Rana
The present study aims to develop an eco-friendly methodology for the recovery of nickel (Ni), molybdenum (Mo), and vanadium (V) from the refinery waste spent hydroprocessing catalyst. The proposed process has two stages: the first stage is to separate alumina, while the second stage involves the separation of metal compounds. The effectiveness of leaching agents, such as NH4 OH, (NH4 )2 CO3 , and (NH4 )2 S2 O8 , for the extraction of Mo, V, Ni, and Al from the refinery spent catalyst has been reported as a function of reagent concentration (0...
May 18, 2018: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
Renata Falchete do Prado, Gabriela Campos Esteves, Evelyn Luzia De Souza Santos, Daiane Acácia Griti Bueno, Carlos Alberto Alves Cairo, Luis Gustavo Oliveira De Vasconcellos, Renata Silveira Sagnori, Fernanda Bastos Pereira Tessarin, Felipe Eduardo Oliveira, Luciane Dias De Oliveira, Maria Fernanda Lima Villaça-Carvalho, Vinicius André Rodrigues Henriques, Yasmin Rodarte Carvalho, Luana Marotta Reis De Vasconcellos
Titanium (Ti) and Ti-6 Aluminium-4 Vanadium alloys are the most common materials in implants composition but β type alloys are promising biomaterials because they present better mechanical properties. Besides the composition of biomaterial, many factors influence the performance of the biomaterial. For example, porous surface may modify the functional cellular response and accelerate osseointegration. This paper presents in vitro and in vivo evaluations of powder metallurgy-processed porous samples composed by different titanium alloys and pure Ti, aiming to show their potential for biomedical applications...
2018: PloS One
Luciana Vidas, Christian Guenther, Timothy Miller, Bastian Pfau, Daniel Perez, Elias Martinez, Michael Schneider, Erik Guehrs, Robert E Marvel, Kent Hallman, Richard F Haglund, Stefan Eisebitt, Simon Wall
We use resonant soft X-ray holography to image the insulator-metal phase transition in vanadium dioxide with element and polarization specificity and nanometer spatial resolution. We observe that nanoscale inhomogenity in the film results in spatial-dependent transition pathways between the insulating and metallic states. Additional nanoscale phases form in the vicinity of defects which are not apparent in the initial or final states of the system, which would be missed in area-integrated X-ray absorption measurements...
May 16, 2018: Nano Letters
Gabriel Jeantelot, Samy Ould-Chikh, Julien Sofack-Kreutzer, Edy Abou-Hamad, Dalaver H Anjum, Sergei Lopatin, Moussab Harb, Luigi Cavallo, Jean-Marie Basset
A specific allotrope of titanium dioxide (anatase) was synthesized both with a standard thermodynamic morphology ({101}-anatase) and with a highly anisotropic morphology ({001}-anatase) dominated by the {001} facet (81%). The surface chemistry of both samples after dehydroxylation was studied by 1H NMR and FT-IR. The influence of surface fluorides on the surface chemistry was also studied by 1H NMR, FT-IR and DFT. Full attribution of the IR spectra of anatase with dominant {001} facets could be provided based on experimental data and further confirmed by DFT...
May 16, 2018: Physical Chemistry Chemical Physics: PCCP
Di Wu, Qianqian Su, Yang Li, Chen Zhang, Xian Qin, Yuan-Yuan Liu, Wen-Song Xi, Yanfeng Gao, Aoneng Cao, Xiaogang Liu, Haifang Wang
Growing interest in monoclinic VO2 nanoparticles (NPs) among consumers and the industries of window coatings, solar sensors etc. has brought particular attention to their safety concerns. The toxicity of this new class of nanomaterials in bacterial ecosystems has not yet been evaluated. The degree of crystallinity is a significant parameter that determines the performance of materials. However, the previously reported methods for toxicity assessment have neglected its influence. In this work, we systematically evaluated the toxicity of VO2 NPs with different degrees of crystallinity to four typical bacterial strains and studied the influence of physicochemical properties and aging treatment on their antibacterial effect...
May 16, 2018: Nanoscale
Bo Chen, Shenxu Bao, Yimin Zhang, Ruwei Zheng
N235-impregnated resins were prepared using XAD-16HP macroporous adsorption resins as support with and without ultrasonic irradiation to evaluate the effects of ultrasound impregnation (UI) on the preparation and adsorption characteristics of the resins. The results show that the impregnation ratio of the solvent-impregnated resins (SIRs) prepared by ultrasound impregnation method (SIRs-UI) increases obviously but their adsorption capacity for V(V) just slightly increases and the utilization rate of the extractant decreases with the augmentation of ultrasound power...
April 2018: Royal Society Open Science
Junwei Ding, Zhiguo Du, Linqing Gu, Bin Li, Lizhen Wang, Shiwen Wang, Yongji Gong, Shubin Yang
Although rechargeable aqueous zinc-ion batteries have attracted extensive interest due to their environmental friendliness and low cost, they still lack suitable cathodes with high rate capabilities, which are hampered by the intense charge repulsion of bivalent Zn2+ . Here, a novel intercalation pseudocapacitance behavior and ultrafast kinetics of Zn2+ into the unique tunnels of VO2 (B) nanofibers in aqueous electrolyte are demonstrated via in situ X-ray diffraction and various electrochemical measurements...
May 15, 2018: Advanced Materials
Soheil Sobhanardakani
The present study was intended to investigate the ecological and human health risk of cobalt, nickel, and vanadium in the atmospheric dry deposition of the Kermanshah city, Iran, in 2015. Totally 54 samples of atmospheric dry deposition were collected from the three regions of the city with different traffic intensity, and after acid digestion of the samples with ultrapure concentrated HNO3 , the total contents of the metals were determined using inductively coupled plasma optical emission spectrometer (ICP-OES)...
May 12, 2018: Biological Trace Element Research
Kun Zhou, Yuan He, Qingchi Xu, Qin'e Zhang, An'an Zhou, Zihao Lu, Li-Kun Yang, Yuan Jiang, Dongtao Ge, Xiang Yang Liu, Hua Bai
Although challenging, fabrication of porous conducting polymeric materials with excellent electronic properties is crucial for many applications. We developed a fast in-situ polymerization approach to pure polyaniline (PANI) hydrogels, with vanadium pentoxide hydrate nanowires as both the oxidant and sacrifice template. A network comprised of ultrathin PANI nanofibers was generated during the in-situ polymerization, and the large aspect ratio of these PANI nanofibers allowed the formation of hydrogels at a low solid content of 1...
May 11, 2018: ACS Nano
Tim J Arciszewski, Rod R Hazewinkel, Kelly R Munkittrick, Bruce W Kilgour
Control charting is a simple technique to identify change and is well-suited for use in water quality programs. Control charts accounting for co-variation associated with discharge and time were used to explore example and representative variables routinely measured in the Athabasca River near the oil sands area for indications of change, including 5 major ions (chloride, sodium, sulphate, calcium, magnesium), 5 total metals (aluminum, iron, thallium, molybdenum, vanadium) and total suspended solids (TSS). Regression equations developed from reference data (1988-2009) were used to predict observations and calculate residuals from later test observations (2010-2016)...
May 10, 2018: Environmental Toxicology and Chemistry
Masashi Arakawa, Kota Ando, Shuhei Fujimoto, Saurabh Mishra, G Naresh Patwari, Akira Terasaki
Reactions of the free tantalum cation, Ta+, and tantalum cluster cations, Tan+ (n = 2-10), with ammonia are presented. The reaction of the monomer cation, Ta+, with two molecules of NH3 leads to the formation of TaN2H2+ along with release of two H2 molecules. The dehydrogenation occurs until the formal oxidation number of the tantalum atom reaches +5. On the other hand, all the tantalum cluster cations, Tan+, react with two molecules of NH3 and form TanN2+ with the release of three H2 molecules. Further exposure to ammonia showed that TanNmH+ and TanNm+ are produced through successive reactions; a pure nitride and three H2 molecules are formed for every other NH3 molecule...
May 10, 2018: Physical Chemistry Chemical Physics: PCCP
Alessandro Bistolfi, Andrea Cimino, Gwo-Chin Lee, Riccardo Ferracini, Giovanni Maina, Paola Berchialla, Giuseppe Massazza, Alessandro Massè
INTRODUCTION: The surface area of exposed metal in a trabecular-titanium acetabular component is wider compared to traditional-titanium implants. The purpose of this study is to establish if this increase in surface area can lead to a significant increase in systemic metal levels. METHODS: 19 patients with conventional acetabular component and 19 with trabecular-titanium cup were compared. Aluminum, Vanadium and Titanium in blood and urine were assessed before surgery and at intervals for 2 years...
May 1, 2018: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
Satabdi Roy, Michael Böhme, Subhashree P Dash, Monalisa Mohanty, Axel Buchholz, Winfried Plass, Sudarshana Majumder, Senthilguru Kulanthaivel, Indranil Banerjee, Hans Reuter, Werner Kaminsky, Rupam Dinda
The synthesis of ethoxido-bridged dinuclear oxidovanadium(IV) complexes of the general formula (HNEt3 )[(VOL1-3 )2 (μ-OEt)] (1-3) with the azo dyes 2-(2'-carboxy-5'-X-phenylazo)-4-methylphenol (H2 L1 , X = H; H2 L2 , X = NO2 ) and 2-(2'-carboxy-5'-Br-phenylazo)-2-naphthol (H2 L3 ) as ligands is reported. The ligands differ in the substituents at the phenyl ring to probe their influence on the redox behavior, biological activity, and magnetochemistry of the complexes, for which the results are presented and discussed...
May 9, 2018: Inorganic Chemistry
Miloš Đokić, Han Sen Soo
Our society's current energy demands are largely met by the exploitation of fossil fuels, which are unsustainable and environmentally harmful resources. However, Nature has provided us with a clean and virtually limitless alternative in the form of solar energy. This abundant resource is utilized constantly by photosynthetic organisms, which has in turn motivated decades of research in our quest to create artificial counterparts of comparable scales. In this feature article, we will highlight some of the recent novel approaches in the field of artificial photosynthesis (AP), which we define by a more general term as a process that stores energy overall by generating fuels and chemicals using light...
May 8, 2018: Chemical Communications: Chem Comm
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