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Vanadate

About: Vanadate is a research topic. Over the lifetime, 4497 publications have been published within this topic receiving 120109 citations. The topic is also known as: vanadate.


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Journal ArticleDOI
TL;DR: Wehrli and Stumm as mentioned in this paper showed that the rate of oxidation of VO2+ by oxygen is significantly enhanced by hydrolysis or adsorption to hydrous oxide surfaces and showed that coordinated OH-groups of solid surfaces are able to mediate the electron transfer from the metal ions to the O2-molecule.

364 citations

Journal ArticleDOI
TL;DR: Results provide evidence for the presence of an electrogenic proton pump driven by MgATP (H+-ATPase) on lysosomes.
Abstract: Fluorescein isothiocyanate-conjugated dextran was introduced preferentially into hepatic lysosomes by intraperitoneal injection into rats. The pH in isolated lysosomes, measured by fluorescein fluorescence, was approximately 5 and gradually increased in KCl (to 7.0) at 25 degrees C. In the presence of Mg2+, ATP caused acidification of lysosomes that was reversed by the protonophore carbonyl cyanide p-trifluoromethoxyphenylhydrazone. Mn2+, Co2+, and Fe2+ could replace Mg2+ but Ca2+ could not. Cu2+, Zn2+, and Cd2+ were inhibitory. A membrane-permeant anion, in practice chloride, was required for this acidification. ATP analogues, including 5'-adenylyl imidodiphosphate, could not be substituted for ATP. ATP-driven acidification was sensitive to N-ethylmaleimide and quercetin but insensitive to oligomycin, ouabain, and vanadate. There were some differences between "normal" lysosomes and tritosomes; the acidification was resistant to azide and N,N'-dicyclohexylcarbodiimide in normal lysosomes but sensitive to these reagents in tritosomes. These results provide evidence for the presence of an electrogenic proton pump driven by MgATP (H+-ATPase) on lysosomes.

358 citations

Book
01 Jan 2008
TL;DR: In this article, the authors present a method for the analysis of Vanadium-Carbon Bond and Vanadate-dependent Haloperoxidases in biological systems, using 51V NMR Spectroscopy and optical spectroscopy.
Abstract: Preface. 1. Introduction and Background. 1.1. History. 1.2. Occurrence, Distribution and Impact. 2. Inorganic and Coordination Compounds of Vanadium. 2.1. Inorganic Aspects of the Function of Vanadium in Biological Systems. 2.2. Interaction of Aqueous Vanadate and Vanadyl with Biogenic Ligands. 2.3. Vanadium Coordination Compounds. 2.4. The Vanadium-Carbon Bond. 3. Physico-chemical Methods for the Characterisation of Native and Model Vanadium Compounds. 3.1. 51V NMR Spectroscopy. 3.2. NMR of Other Nuclei. 3.3. EPR Spectroscopy. 3.4. ESEEM and ENDOR Spectroscopies. 3.5. Optical Spectroscopies. 3.6. X-ray Absorption Spectroscopy. 4. Naturally Occurring Vanadium Compounds. 4.1 Vanadium in Ascidians and Polychaeta Worms. 4.2. Amavadin. 4.3. Vanadate-dependent Haloperoxidases. 4.4. Vanadium and the Nitrogen Cycle. 4.5. Vanadate as Energiser for Bacteria, and Vanadophores. 5. Inferences of Vanadium Compounds on Cellular Functions. 5.1. Medicinal Aspects of Vanadium. 5.2. Interaction of Vanadium with Proteins and Protein Substrates. 6. Epilogue. References. Index.

351 citations

Journal ArticleDOI
TL;DR: In this article, a combination of Raman spectroscopy and temperature-programmed reduction (TPR) was used for qualitative and quantitative structural analysis of vanadium(V) oxide supported on 7-A1203, GO2, Cr2O3, Si02, Ti02, and Zr02.
Abstract: Vanadium(V) oxide supported on 7-A1203, GO2, Cr2O3, Si02, Ti02, and Zr02 was studied by X-ray fluorescence, by X-ray diffraction, and especially by the combination of Raman spectroscopy and temperature-programmed reduction (TPR) for qualitative and quantitative structural analysis, respectively. Catalysts were prepared via ion-exchange and wet-impregnation methods. The V contents ranged from - 1 to 40 wt % V. At low surface concentrations only surface vanadate phases of two-dimensional character are observed for all carriers. According to Raman and TPR data the structure of these surface vanadate species is independent of the preparation technique. At medium and high surface concentrations, the webimpregnated samples already contain crystalline V20b At equal surface concentrations the ion-exchanged catalysts contain no V205 crystallites. An exception is Si02 on which also crystalline V206 is formed in both preparation techniques. Monolayer stability toward thermal treatment decreases in the order AZO>3 Ti02> Ce02,w hereas on heating ion-exchanged V/Si02 the crystalline V206 spreads out over the silica surface. The reducibilities of the ion-exchanged catalyats, as measured by TPR, can be used as a measure for the contact interaction between vanadia and the carrier oxides. At temperatures of 500-800 K, this interaction ranges from strong with titania to weak with silica as a carrier.

351 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023109
2022211
202178
202075
201996
201899