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  • 1
    Electronic Resource
    Electronic Resource
    Metal-hydroxycarboxylate interactions: syntheses and structures of K2[VO2(C6H6O7)]2·4H2O and (NH4)2[VO2(C6H6O7)]2·2H2O (1995)
    Springer
    Journal of chemical crystallography 25 (1995), S. 807-811 
    Details
    ISSN: 1572-8854
    Keywords: Citric acid ; citrate complex ; oxovanadium(V) complex ; vanadate ; molecular structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Potassium and ammonium dimeric (citrato)dioxovanadium(V) hydrate K2[VO2(H2cit)]2·4H2O1 and (NH4)2[VO2(H2cit)]2·2H2O2 (H4cit=citric acid) have been prepared and characterized by X-ray structure analyses. Vanadate1 crystallizes in the monoclinic space groupP21/n (No. 14) with unit cell parameters:a=9.304(2),b=11.756(2),c=11.911(2)Å, β=111.72(3)°, andD c=1.911 g/cm3,Z=2; Vanadate2 also crystallizes in the monoclinic space groupP21/n with unit cell parameters:a=9.719(2),b=11.111(3),c=11.294(2)Å, β=109.03(2)°, andD c=1.781 g/cm3,Z=2. Each dimer contains a centro-symmetric planar four-member V2O2 ring with two exocyclic citrate entities coordinated by the oxygen atoms of the hydroxy-and α-carboxylate ligands, while the other two β-carboxylate groups remain uncomplexed. Principal dimensions of the V−O bonds are 1.986(4)av (hydroxy) and 1.980(3)Å(α-carboxyl) for vanadate1, 1.988(2)av (hydroxy) and 1.974(3)Å(α-carboxyl) for vanadate2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01671075
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  • 2
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure of dimeric bis[dibutyl(2-hydroxyphenylmethylimino-β-alaninato)tin] oxide (1993)
    Springer
    Journal of chemical crystallography 23 (1993), S. 153-157 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01195450
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  • 3
    Electronic Resource
    Electronic Resource
    Complexation between vanadium(V) and citrate: spectroscopic and structural characterization of a dinuclear vanadium(V) complex (1999)
    Springer
    Transition metal chemistry 24 (1999), S. 605-609 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Investigation of the aqueous coordination chemistry for citrate and vanadium(V) resulted in the isolation and characterization of a dinuclear vanadium(V) citrato complex (1) Na2K2[VO2(Hcit)]2 · 9H2O. Complex (1) is an intermediate between the fully deprotonated and diprotonated citrate vanadate. It may represent an early mobilized precursor in the biosynthesis of FeV-co, as well as a relevant model in the proton transport relay process between P-cluster pair to M-cluster pair. The complex has been characterized by elemental analyses and i.r. spectroscopy. Its i.r. spectra are consistent with a oxo-bridged dinuclear structure as revealed by a single crystal X-ray diffraction study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006947218366
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  • 4
    Electronic Resource
    Electronic Resource
    Oxidative dehydrogenation of propane over a series of low‐temperature rare earth orthovanadate catalysts prepared by the nitrate method (1999)
    Springer
    Catalysis letters 61 (1999), S. 39-44 
    Details
    ISSN: 1572-879X
    Keywords: low‐temperature catalysts ; rare earth orthovanadate catalysts ; oxidative dehydrogenation of propane ; nitrate method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A series of high‐purity rare earth orthovanadates were prepared by the nitrate method and found to be effective low‐temperature catalysts for the oxydehydrogenation of propane at 320°C, at which no reactions occurred over the catalysts reported in the literature, and, thus, may be of practical significance. The catalytic performances of LnVO4 (Ln = Y, Ce–Yb) at 500°C were much better than those of rare earth orthovanadate catalysts and also slightly exceeded that of magnesium orthovanadate Mg3(VO4)2 reported in the literature. LnVO4 (Ln = Y, Ce–Yb) materials were tetragonal active phases which could stabilize the existence of active sites for the oxydehydrogenation of propane. Some catalysts with a certain amount of LnVO3 reduced from LnVO4 (Ln = Ho–Yb) under reaction atmosphere exhibited better redox properties and catalytic performances possibly due to the existence of biphasic catalytic synergy. LaVO4 was a monoclinic unstable active phase, although its bulk structure did not change after reaction. The remarkable deactivation of the LaVO4 catalyst was probably due to that LaVO4 could not stabilize the existence of surface active sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019096116289
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  • 5
    Electronic Resource
    Electronic Resource
    Temperature dependence of high field transport in ZnS (2000)
    Springer
    Czechoslovak journal of physics 50 (2000), S. 1159-1167 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract High field transport process in ZnS in the temperature range of (10–500) K was simulated by help of Monte Carlo method. The band structure of ZnS is described by analytical fitting of real band structure. Phonon scattering, spatial charge scattering, and impact ionization process are included in the simulation. The phonon scattering rates at different temperatures are calculated and compared. The transient acceleration time of electrons in ZnS is found to be temperature-independent. We attribute this result to the compensation of two opposite factors in ZnS. Average energy of electrons decreases with temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022808818717
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  • 6
    Electronic Resource
    Electronic Resource
    Study of the alkylation behaviors of antitumor agents to DNA using a quartz crystal resonator in PEG-DNA solution (1997)
    Springer
    Fresenius' journal of analytical chemistry 357 (1997), S. 921-926 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract  The alkylation of DNA by antitumor agents such as mechlorethamine hydrochloride (mustargen), thiophosphoramide (TSPA), mitomycin c (MMC), bleomycin-A5 and dacarbazine (DTIC) can be detected with quartz crystal resonators (QCR). In the course of alkylation, the resonator frequency change in polyethylene glycol (PEG)-DNA solutions follows the cross-linking of DNA and the cleavage of the sugarphosphate backbone of DNA. It is at least partly attributed to the viscosity change of the PEG-DNA solution and possibly to some extent to the change of mass adsorbed on the QCR surface due to cross-linking and cleavage. Experimental results are consistent with that expected from theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050275
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  • 7
    Electronic Resource
    Electronic Resource
    The bis(ethylene)-dithiotetrathiafulvalene radical salt of [PVMo11O40]4− (1999)
    Springer
    Transition metal chemistry 24 (1999), S. 160-162 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The charge transfer salt, (ET)5PVMo11O40·2H2O [ET=bis(ethylene)-dithiotetrathiafulvalene], was prepared by reducing the diamagnetic molybdovanadophosphoric heteropoly acid (H4PMo11VO40·nH2O, HMVP) with the organic donor ET. The u.v.-vis spectrum of the complex shows an electronic transfer band at 900nm. The i.r. and Raman spectra suggest that the ET donor molecules are all completely ionized. Magnetic measurements indicate the presence of antiferromagnetic interactions in the ET organic sublattice. The e.s.r. spectrum exhibits a VIV signal with g=1.9718 and a=57.5cm−1. Over the measured temperature range (75–300K), no significant interaction between the paramagnetic anion and the organic radical cation is observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006910216184
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  • 8
    Electronic Resource
    Electronic Resource
    Advanced glycation end products in human senile and diabetic cataractous lenses (2000)
    Springer
    Molecular and cellular biochemistry 210 (2000), S. 29-34 
    Details
    ISSN: 1573-4919
    Keywords: advanced glycation ; glycoxidation ; human eye lens ; cataracts ; diabetes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract The authors prepared water-soluble (WSF), urea-soluble (USF), alkali-soluble (ASF), sonicated (SF), sonicated insoluble (SIF) and membrane (MF) fractions of lens proteins from human senile and diabetic cataractous lenses and age-matched clear lenses. Levels of advanced glycation end products (AGEs) including carboxymethyl lysine (CML), a glycoxidation product, were determined by both non-competitive and competitive enzyme-linked immunosorbent assay (ELISA). Distribution of AGEs in the various protein fractions was ascertained by SDS-PAGE and Western blotting. An overall increase in the levels of AGEs in diabetic cataractous lenses as compared to senile cataractous lenses and clear lenses has been observed. ASF and SF , both of which originated from the urea-insoluble fraction, showed the highest levels of AGEs. However, no clear-cut differences in CML levels were seen among clear lenses and senile and diabetic cataractous lenses. AGEs were found to be distributed mostly in the high molecular aggregates in all the fractions. These data suggest that AGEs contribute to protein aggregation and subsequent insolubilization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007015416572
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  • 9
    Electronic Resource
    Electronic Resource
    Magnesium oxide-supported polytitazane cobalt(III) complex for catalytic epoxidation of α-pinene with molecular oxygen (1996)
    Springer
    Polymer bulletin 36 (1996), S. 1-5 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Magnesium oxide-supported polytitazane cobalt complex has been prepared and found to be a very effective catalyst for the epoxidation of α-pinene in the presence of an aldehyde as a reductant. XPS data show that the high valent cobalt(III) was stabilized by the mutidentate nitrogen ligand of polytitazane. The α-pinene oxide can be obtained in 96.0% yield with 96.6% selectivity at 25°C under an atmospheric pressure of molecular oxygen. Isobutyraldehyde is an effective reductant and only 1.2 equivalent of isobutyraldehyde to α-pinene is needed to ensure high yield of α-pinene oxide. The catalyst is also very stable and can be reused at least eight times without loss of its activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00296000
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  • 10
    Electronic Resource
    Electronic Resource
    The remainder-effect analysis of finite difference schemes and the applications (1995)
    Springer
    Applied mathematics and mechanics 16 (1995), S. 87-96 
    Details
    ISSN: 1573-2754
    Keywords: finite difference scheme ; remainder effect ; group velocity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Mathematics , Physics
    Notes: Abstract In the present paper, two contents are enclosed. First, the Fourier analysis approach of the dispersion relation and group velocity effect of finite difference schemes is discussed, the defects of the approach is pointed out and the correction is made; Second, a new systematic analysis method-remaider-effect analysis (abbr. REAM) is proposed by means of the modified partial differential equations (abbr. MPDE) of finite difference schemes. The analysis is based on the synthetical study of the rational dispersion-and dissipation relations of finite difference schemes. And the method clearly possesses constructivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02453778
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