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Showing 1 to 20 of 36 for “"Vanadate"”.
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Structural characterization and optical transmission studies of vanadate glasses
… transmission studies have been carried out on vanadate glasses based on the system V205-P205 in the range 70.0-87.5 mole % V205 0 The optical studies are compared with other studies of crystalline V205, and additional transmission measurements on V20 S were performed. Structural …
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Enzyme-Catalyzed Phosphoryl Transfer Reactions: Energetics of Transition States and Vanadate Analogues in Aqueous Solution
… such as glycolysis and DNA replication. Vanadate is recognized as an effective structural and electronic analogue of phosphate. Solvation effects are significant contributors to the reaction free energies and activation barriers of organic phosphate hydrolysis reactions. The methanolysis …
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Optical spectroscopy, crystal field analysis, upconversion and energy transfer studies of Er³⁺ doped yttrium vanadate single crystals
This thesis presents an extensive spectroscopic investigation of Er$\sp{3+}$ doped in YVO$\sb4$ single crystals. The polarized visible and near infrared absorption and emission spectra are presented. The spectra were analyzed to determine the energy levels of Er$\sp{3+}$ in YVO$\sb4$ and a complete …
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Characterization, purification, and DNA sequence analysis of a novel ATPase of the archaebacterium Methanococcus voltae
… voltae. The ATPase was inhibited by vanadate, a characteristic inhibitor of the P type ATPases. The enzyme activity was also inhibited by diethylstilbestrol. However, it was insensitive to N,N$\sp\prime$-dicyclohexylcarbodiimide, bafilomycin A$\sb1$, nitrate, ouabain and oligomycin. …
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23Na/51 V-NMR study of (Alpha)´- NaV2O5
… work I present a 23Na/51V-NMR study of sodium vanadate as pure compound, and the influence of very small amounts of Sodium substitution by Calcium and Lithium is reported and discussed. The measurements of spin-lattice relaxation for 23Na and 51V are also presented. The sodium vanadate is found …
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Low-Temperature Densification of Lead Zirconate Titanate With Vanadium Pentoxide Additions
… with the surface layers to form a low-melting vanadate phase and surfaces of high defect concentration, primarily in regions of particle-particle contacts. Rapid densification, by almost immediate particle rearrangement and pore removal, occurs with melting of the lead vanadate phase due to the …
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Proton-atpase in fish gills
… proton excretion, however, was sensitive to vanadate and acetazolamide, suppressed by low external water pH and sodiumlevels, and stimulated by elevated ambient Pco2. All these characteristics are typical for proton transport mediated by anelectrogenic proton pump, as demonstrated in frog …
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Identification and characterization of an adenosine triphosphate binding cassette (ABC) transporter EcABCB1 involved in the transport of alkaloids in Eschscholzia californica
… multi-specific ABC transporter sensitive to vanadate.
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Environmentally friendly corrosion resistant coatings as alternatives for cadmium and chromium in the aerospace industry
… with the development of a permanganate-vanadate based conversion coating as an alternative to the Cr(VI) based treatment. The plasma sprayed AlMn12 alloy had very good electrochemical properties and medium term corrosion resistance, but did not pass the bend adhesion test. The Mn-V …
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Étude des propriétés optiques et électrochimiques du pentoxyde de vanadium préparé par la méthode sol-gel
… soit par acidification d'une solution aqueuse de vanadate de sodium dans une colonne échangeuse de protons, soit par des réactions d'hydrolyse et de polycondensation d'un alcoxyde. La structure des films V$ \ Sb2$O$ \ sb5$ déposés sur différents substrats a été examinée par spectroscopie …
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Comparison of Ecto-Nucleotidase Activity in PAR-C5 Cells and Native Rat Parotid Gland
… and resistant to the inhibitors, ouabain and vanadate. The enzyme was non-selective as to nucleotide substrate. Assays in the presence of 100 pM of each of the substrates gave the following relative activities (%) compared to that of 100 uM ATP; GTP (104.5±7.9), ITP (87.4±9.4), UTP (80.1±9.9), …
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Electronic structure of strongly correlated low-dimensional spin ½ systems: cuprates and vanadates
… we presented the calculations for three novel vanadates: MgVO3, Sb2O2VO3 and VOMoO4. The tight-binding parameters and the exchange integrals were computed. The magnesium and antimony vanadates appeared to be spin-½ one-dimensional systems, the latter having much stronger one-dimensional …
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Solar energy conversion via photovoltaics and photocatalysis
… Deposition) polymers and doping-treated bismuth vanadate (BiVO 4), respectively. oCVD is a solvent-free conformal vacuum-based technique to enable thin-film fabrication of insoluble polymers at moderate vacuum (~ 0.1 Torr) and low temperature (25 150 °C). Moreover, oCVD carries the well-cited …
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Development of novel photocatalysts for solar hydrogen production
… activated photocatalyst is reported herein. Iron vanadate, FeVO4, was first synthesised using a low-temperature, aqueous precipitation reaction. The material prepared was found to be predominantly amorphous and required thermal treatment. The resultant material was characterised using XRD, SEM, IR …
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Characterisation of the pre-invasion glycophosphatidylinositol-anchored surface proteins of Plasmodium falciparum merozoites
… merozoites to be harvested. Four compounds (vanadate, edelfosine, dioctyl sodium sulfosuccinate (DSS), and gentamicin) suspected to interfere with GPIanchored cleavage or processes were screened on intraerythrocytic stages and merozoites. Antimalarial and anti-invasive properties of these …
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Synthesis, Structure and Properties of Mixed Metal Oxides: From Pyrochlores to Fluorites
… Characterisation and Properties of New Bismuth Vanadate Oxide Ion Conductors: DFT molecular dynamics simulations carried out on Bi19V2O33.5 have revealed the O2- migration pathways in this material with exceptional ionic conductivity. The synthesis and characterisation of new doped bismuth …
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An Experimental and Theoretical Investigation into Mg-ion Battery Electrodes using Nuclear Magnetic Resonance Spectroscopy
… techniques is then applied to two of magnesium vanadates for high-voltage cathode applications. In particular, DFT-based thermodynamic energies are used to rationally design the synthetic steps leading to the said vanadate materials, followed by DFT prediction of the migration barriers. The …
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Conformational Studies of Myosin and Actin with Calibrated Resonance Energy Transfer
… in the presence of ADP-AlF4, ADP-BeFx, and ADP-vanadate than in the presence of ADP or no nucleotide. These data detect profound differences in the conformations of the weakly and strongly attached crossbridges which appear to result from a conformational selection that occurs during the weak …
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Gas Phase Oxidation of Levulinic Acid for the Production of Maleic Anhydride over Supported Vanadium Oxide Catalysts
… cleavage reactions. To probe the extent to which vanadate structure dictates reactivity and selectivity, we consider the oxidative cleavage of 2-pentanone over a number of vanadium oxide catalysts that vary in both vanadium oxide structure and support. We observe that activity and selectivity on …
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