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  • American Chemical Society  (21)
  • Springer  (21)
  • American Physical Society (APS)
  • 2000-2004  (34)
  • 1950-1954  (8)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Modulating the hydroxylamine accumulation in the hydrogenation of substituted nitroarenes using vanadium-promoted RNi catalysts (2000)
    Springer
    Topics in catalysis 13 (2000), S. 205-212 
    Details
    ISSN: 1572-9028
    Keywords: hydrogenation of aromatic nitro compounds ; Raney nickel ; vanadium promoter ; modified catalysts ; aryl hydroxylamine ; chloronitrobenzene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The effect of vanadium promotion of Raney nickel on aryl hydroxylamine accumulation in the catalytic hydrogenation of electron deficient aromatic nitro compounds was investigated. High accumulation of 70–80% was observed with unmodified Raney nickel. Vanadium promoters were able to modulate the accumulation and depending on the modifier used, an increase (up to 86%) or a decrease (down to 11%) was found. Higher rates were obtained in the former (up to a factor 1.3), lower ones in the latter case (down to a factor 0.1) compared to the unmodified system. Supported or unsupported NH4VO3 was usually the most efficient modifier for obtaining low accumulation and reasonable rates, but the optimum concentration and modification procedure had to be determined for every substrate separately. In cases of low accumulation, the vanadium promoters worked as disproportionation catalysts. Dehalogenation was not significantly influenced by the presence of promoters: in all cases dehalogenation took only place after both the nitro arene and aryl hydroxylamine compound had been consumed completely.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009050804228
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  • 2
    Electronic Resource
    Electronic Resource
    Chromium doped manganites: evidence for electronically phase-separated systems (2000)
    Springer
    The European physical journal 18 (2000), S. 233-240 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 75.30.Vn Colossal magnetoresistance - 78.70.Dm X-ray absorption spectra - 75.25.+z Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: X-ray absorption spectroscopy (XAS) and soft-X-ray magnetic circular dichroism (SXMCD) at the Mn L2,3-, Cr L2,3- and O-K edges of Sm0.5Ca0.5Mn1-xCrxO3 ( ) bulk polycrystalline samples have been performed at T=20 K below the ferromagnetic Curie temperature. We show the existence of a magnetic sublattice on each of the probed cations. Considering an electronically phase-separated system, results are compared with magnetization and resistivity measurements and a tentative correlation with magnetoresistance properties on such doped compounds is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510070053
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  • 3
    Electronic Resource
    Electronic Resource
    Enantioselective Homogeneous Hydrogenation of Monosubstituted Pyridines and Furans (2000)
    Springer
    Monatshefte für Chemie 131 (2000), S. 1335-1343 
    Details
    ISSN: 1434-4475
    Keywords: Keywords. Homogeneous catalysis; Enantioselective hydrogenation; Heterocyclic arenes; Rh diphosphine complexes.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary.  The first case of an enantioselective hydrogenation of monosubstituted pyridines and furans with homogeneous rhodium diphosphine catalysts with low but significant enantioselectivities and catalyst activities is reported. Best enantioselectivities (ees of 24–27%) were obtained for the hydrogenation of 2- and 3-pyridine carboxylic acid ethyl ester and 2-furan carboxylic acid with catalysts prepared in situ from [Rh(nbd)2]BF4 and the chiral ligands diop, binap, or ferrocenyl diphosphines of the josiphos type. Turnover numbers (ton) were in the order of 10–20, turnover frequencies (tof) usually 1–2 h−1. Diphosphines giving 6- or 7-ring chelates led to higher ees than 1,2-diphosphines; otherwise, no clear correlation between ligand properties and catalytic performance was found. In some experiments black precipitates were observed at the end of the reaction, indicating the decomposition of the homogeneous catalysts for certain ligand/metal/substrate combinations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007060070013
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  • 4
    Electronic Resource
    Electronic Resource
    Vorkommen und Bedeutung des körpereigenen Heparins (1954)
    Springer
    Cellular and molecular life sciences 10 (1954), S. 148-152 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The chemistry of heparin and its occurrence in the organism are briefly explained. Heparin is mainly found in theEhrlich tissue-mastcells. Their anatomy, topography, physiology, pathology and pathophysiology are dealt with in detail. The mastcells are experimentally established to be the place where heparin is formed and stored. It is now being experimentally and clinically investigated whether and to what extent naturally occuring heparin possesses a function which goes beyond that of a physiological anticoagulant and whether it is of any significance as a growth-inhibitor of tumors. It is further being examined whether naturally occuring heparin has an influence on the formation of connective-tissue groundsubstance and whether it may have an effect on the inhibition of arteriosclerotic vascular changes. The interpretation of these investigations, however, is still more or less speculative.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02158526
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  • 5
    Electronic Resource
    Electronic Resource
    Zur Molekulargewichtsverteilung von Blutersatzpräparaten aus Polyvinylpyrolidon (1951)
    Springer
    Cellular and molecular life sciences 7 (1951), S. 96-97 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The molecular weight distribution of two commercial blood substitutes of the polyvinyl-pyrrolidone type is determined. The width of this distribution is discussed in relation to excretion experiments. It is shown by histological methods that fractions of polyvinylalcohol of an average molecular weight of 75,000 are retained in the organs to a greater extent than fractions of an average molecular weight of 25,000.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02165556
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  • 6
    Electronic Resource
    Electronic Resource
    über kolloides Nickelhydroxyd (1954)
    Springer
    Colloid & polymer science 139 (1954), S. 131-133 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Zusammenfassung Es wird eine Methode zur Herstellung von Nickelhydroxydsolen verschiedener Konzentration und mit verschiedener Teilchengrö\e beschrieben.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01512522
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  • 7
    Electronic Resource
    Electronic Resource
    Aufteilung der Cellulose in Moleküle und größere Teilchen bei der Veresterung (1950)
    Springer
    Monatshefte für Chemie 81 (1950), S. 232-238 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Zusammenfassung Die Strömungsdoppelberchung vieler Ester der Cellulose mit organischen Säuren zeigt neben den Kettenmolekülen gröbere, leicht orientierbare Teilchen an. Diese können durch Fraktionierung in den schwerts löslichen Anteilen stark angereichert werden. Sie lassen sich mit der Ultrazentrifuge im Sedimentationsdiagramm erkennen und können elektronenmikroskopisch sichtbar gemacht werden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00899236
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  • 8
    Electronic Resource
    Electronic Resource
    Über die Auflösung der Cellulose in organischen Lösungsmitteln (1950)
    Springer
    Monatshefte für Chemie 81 (1950), S. 151-154 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00899227
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  • 9
    Electronic Resource
    Electronic Resource
    Damage processes in Fe 3 O 4 magnetic insulator irradiated by swift heavy ions. Experimental results and modelisation (2001)
    Springer
    The European physical journal 24 (2001), S. 291-295 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 61.80.Jh Ion radiation effects – 75.60.-d Domain effects, magnetization curves, and hysteresis – 85.70.Ge Ferrite and garnet devices
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The behavior of the magnetic properties of magnetite Fe3O4 irradiated by swift heavy ions is investigated by magnetization measurements. Although there is no induced structural phase transformation, both coercive field and saturation magnetization are sensitive to ion irradiation and exhibit different behaviors depending on the ion fluence range. In the low fluence regime, the coercive field increases, which is evidence for a strong pinning of magnetic domain boundaries by the induced defects. The magnetization shows a decrease in the saturation value and tends to reorient perpendicularly to the ion track axis. At high fluence, the initial magnetic properties of the sample are nearly restored. The changes in the magnitude and the direction of magnetization are interpreted by magnetostrictive effects related to the stress induced by irradiation. A phenomenological model is applied to reproduce the fluence evolution of the saturation magnetization, assuming relaxation of the stress induced around the core of defects of the tracks by overlapping effects at high fluence. The results are compared to those obtained in the case of yttrium iron garnet Y3Fe5O12.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s10051-001-8676-3
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  • 10
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    Unknown
    Antigen/Antibody Immunocomplex from CdTe Nanoparticle Bioconjugates (2002)
    American Chemical Society
    Details
    Publication Date: 2002-08-01
    Print ISSN: 1530-6984
    Electronic ISSN: 1530-6992
    Topics: Chemistry and Pharmacology , Physics
    Published by American Chemical Society
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