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  • 1
    Electronic Resource
    Electronic Resource
    NADH oxidation is stimulated by an intermediate formed during vanadyl-H"2O"2 interaction
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/General Subjects 1201 (1994), S. 289-297 
    Details
    ISSN: 0304-4165
    Keywords: Diperoxovanadate ; NADH oxidation ; Oxygen radical ; Vanadyl oxidation
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-4165(94)90053-1
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  • 2
    Electronic Resource
    Electronic Resource
    Polyvanadate-stimulated NADH oxidation by plasma membranes-The need for a mixture of deca and meta forms of vanadate
    Amsterdam : Elsevier
    Archives of Biochemistry and Biophysics 297 (1992), S. 244-252 
    Details
    ISSN: 0003-9861
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0003-9861(92)90668-M
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  • 3
    Electronic Resource
    Electronic Resource
    A novel phenomenon of burst of oxygen uptake during decavanadate-dependent oxidation of NADH (1993)
    Springer
    Molecular and cellular biochemistry 121 (1993), S. 21-29 
    Details
    ISSN: 1573-4919
    Keywords: decavanadate ; NADH oxidation ; oxygen burst ; microsomes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract Oxidation of NADH by decavanadate, a polymeric form vanadate with a cage-like structure, in presence of rat liver microsomes followed a biphasic pattern. An initial slow phase involved a small rate of oxygen uptake and reduction of 3 of the 10 vanadium atoms. This was followed by a second rapid phase in which the rates of NADH oxidation and oxygen uptake increased several-fold with a stoichiometry of NADH: O2 of 1∶1. The burst of NADH oxidation and oxygen uptake which occurs in phosphate, but not in Tris buffer, was prevented by SOD, catalase, histidine, EDTA, MnCl2 and CuSO4, but not by the hydroxyl radical quenchers, ethanol, methanol, formate and mannitol. The burst reaction is of a novel type that requires the polymeric structure of decavanadate for reduction of vanadium which, in presence of traces of H2O2, provides a reactive intermediate that promotes transfer of electrons from NADH to oxygen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00928696
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  • 4
    Electronic Resource
    Electronic Resource
    Decavanadate possesses α-adrenergic agonist activity and a structural motif common with trans-β form of noradrenaline (1997)
    Springer
    Molecular and cellular biochemistry 169 (1997), S. 27-36 
    Details
    ISSN: 1573-4919
    Keywords: decavanadate ; a-adrenergic receptor ; noradrenaline ; aortic contraction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract Decavanadate, an inorganic polymer of vanadate, produced contraction of rat aortic rings at a relatively high concentration compared to phenylephrine, an agonist of α-adrenergic receptor. This effect was blocked by two known a-adrenergic receptor antagonists, prazosin and phenoxybenzamine. Decavanadate, formed by possible dimerization of V5 under acid conditions, possessed a structural feature of two pairs of unshared oxygen atoms at a distance of 3.12 Å, not found in its constituents of V4 or V5. A structural motif of O..O..O using such oxygen atoms is recognized in decavanadate. This matches with a similar motif of N..O..O that uses the essential amino and hydroxyl groups of the side-chain and the m-hydroxyl group in trans-b form of noradrenaline. The interaction of such a structural motif with the membrane receptor is likely to be the basis of the unusual noradrenaline-mimic action of decavanadate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006882408983
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  • 5
    Electronic Resource
    Electronic Resource
    Characterization of oxygen free radicals generated during vanadate-stimulated NADH oxidation (1992)
    Springer
    Molecular and cellular biochemistry 111 (1992), S. 33-40 
    Details
    ISSN: 1573-4919
    Keywords: vanadate stimulation ; NADH oxidation ; hydroxyl radicals ; superoxide formation ; SOD-insensitive cytochrome c reduction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract The oxidation of NADH and accompanying reduction of oxygen to H2O2 stimulated by polyvanadate was markedly inhibited by SOD and cytochrome c. The presence of decavanadate, the polymeric form, is necessary for obtaining the microsomal enzyme-catalyzed activity. The accompanying activity of reduction of cytochrome c was found to be SOD-insensitive and therefore does not represent superoxide formation. The reduction of cytochrome c by vanadyl sulfate was also SOD-insensitive. In the presence of H2O2 all the forms of vanadate were able to oxidize reduced cytochrome c, which was sensitive to mannitol, tris and also catalase, indicating H202-dependent generation of hydroxyl radicals. Using ESR and spin trapping technique only hydroxyl radicals, but not superoxide anion radicals, were detected during polyvanadate-dependent NADH oxidation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00229571
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  • 6
    Electronic Resource
    Electronic Resource
    Physical properties of LiMn2O4 spinel prepared at moderate temperature (1998)
    Springer
    Ionics 4 (1998), S. 8-15 
    Details
    ISSN: 1862-0760
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A moderate-temperature method of preparation of the spinel LiMn2O4 was developed around 500 °C. Physical features of the products were identified by X-ray photoelectron spectroscopy, X-ray diffractometry, Raman scattering and FTIR spectroscopy. The electronic conductivity of LiMn2O4 has been studied as a function of annealing temperature. The product LiMn2O4 is identified as a micron-sized powder and analysis of the local environment is in good accordance with the classical structural model of Fd3m space group. LiMn2O4 exhibits an electrical conductivity of 1.9×10−5 S/cm at room temperature with an activation energy of 0.16 eV which corresponds to an electron hopping mechanism between the two charge states of Mn3+ and Mn4+ ions. A first-order phase transition is observed at 292 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02375774
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  • 7
    Electronic Resource
    Electronic Resource
    Physical Properties and Electrochemical Features of Lithium Nickel-Cobalt Oxide Cathode Materials Prepared at Moderate Temperature (1999)
    Springer
    Journal of electroceramics 3 (1999), S. 425-432 
    Details
    ISSN: 1573-8663
    Keywords: Li-Ni-Co oxides ; Raman ; FTIR ; electrochemical properties ; lithium batteries
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract In this paper, we report the synthesis, the physical properties and the electrochemical features of the lithium nickel-cobalt oxide cathode materials prepared by a combustion method at moderate temperature. Structural properties were investigated by X-ray diffraction, Raman scattering and FTIR. Spectroscopic measurements show unambiguously that the final product is identified as a modified-spinel structure (Fd3m space group) with the stoichiometric formula Li2[Ni0.5Co0.5]2O2. Electrochemical cells Li//Li2[Ni0.5Co0.5]2O2 were fabricated using an organic electrolyte and their performances were tested. For a modified-spinel Li2[Ni0.5Co0.5]2O4 structure the chemical diffusion coefficient of Li ions is around 10−10 cm2s, which is lower than for a layered LiNi0.5Co0.5O4 host matrix.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009930317366
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  • 8
    Electronic Resource
    Electronic Resource
    Characterization and Electrochemical Studies of LiMn2O4 Cathode Materials Prepared by Combustion Method (1999)
    Springer
    Journal of electroceramics 3 (1999), S. 433-441 
    Details
    ISSN: 1573-8663
    Keywords: LiMn2O4 spinel ; Raman ; FTIR ; XPS ; lithium-ion batteries
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A combustion method using urea as a fuel has been developed for the synthesis of the spinel LiMn2O4 around 500°C. Physical features of the products were identified by X-ray photoelectron spectroscopy, X-ray diffractometry, Raman scattering and FTIR spectroscopy. Cells were fabricated with Li//LiMn2O4 and C//LiMn2O4 in nonaqueous organic electrolyte and their performances were studied. A kinetic profile for diffusion of Li ions in the composite matrix was developed and tested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009982301437
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