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  • American Chemical Society  (23)
  • Springer  (20)
  • American Physical Society (APS)
  • 2000-2004  (34)
  • 1975-1979  (9)
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Keywords
Publisher
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Four-coordinate high-spin and five-coordinate low-spin complexes of cobalt(II) chloride with ethyl phosphite, phosphonite, and phosphinite ligands. Refinement of the Evans nuclear magnetic resonance method for the study of spin equilibriums (1976)
    s.l. : American Chemical Society
    Inorganic chemistry 15 (1976), S. 1352-1358 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic50160a022
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  • 2
    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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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    The use of Hoare's method of program verfification for the quicksort algorithm (1977)
    Springer
    Computing 18 (1977), S. 281-293 
    Details
    ISSN: 1436-5057
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Die vorliegende Arbeit analysiert die Erfahrungen, die bei der Durchführung formaler Korrektheitsbeweise an schon exsiterenden Programmen gemacht wurden. Mit Hilfe der Hoareschen Methode der Programmverfikation wurde der von an Emden angegebene Quicksort Algorithmus als richtig bewiesen. Dafür was es jedoch notwendig, eine Reihe von Veränderungen an dem Algorithmus vorzunehmen, um ihn an das Beweisverfahren und die existierenden Axiome anzupassen. Die gegenseitige Einflußnahme der Veränderungen und des Beweisverfahrens werden analysiert und Schlüse über die Verwendbarkeit des Hoareschen Verifikationsverfahrens für existierende Programme werden gezogen.
    Notes: Abstract Using the Quicksort Algortihm, given by van Emden, an analysis is made how Hoare's method of program verification can be applied to already existing programs. Changes to these programs become necessary to adopt them to the proving method and to the existing axioms. The interdependencies between these changes and the verification method are discussed and conclusions are draw about the applicability of Hoare's Methods for proving already existing programs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02244016
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  • 5
    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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  • 6
    Electronic Resource
    Electronic Resource
    Ethics and the unintended consequences of social research: A perspective from the sociology of science (1977)
    Springer
    Policy sciences 8 (1977), S. 111-124 
    Details
    ISSN: 1573-0891
    Source: Springer Online Journal Archives 1860-2000
    Topics: Political Science , Economics
    Notes: Abstract It is argued that “successful” social science requires the development of a social ethic or sense of research responsibility. An examination of impediments to ethical reflection in sociology suggests that an individualistic orientation is ineffective in coping with the unintended consequences of social research. Such consequences can be particularly harmful in the sociology of science where policy research and governmental support for its production often entails an “indiscriminate advocacy of knowledge.” Such advocacy raises anew questions of the power of scientific knowledge, the definition of client-professional relationships, and the collection of data which may not only violate the intent of individuals and groups supplying information, but may undermine the credibility of sociology itself.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01712288
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  • 7
    Electronic Resource
    Electronic Resource
    Effects of calcium ionophores on the transport and distribution of calcium in isolated cells and in liver and kidney slices (1978)
    Springer
    The journal of membrane biology 38 (1978), S. 51-72 
    Details
    ISSN: 1432-1424
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Summary The effects of calcium ionophores on cellular calcium metabolism were studied in cultured kidney cells, in cells freshly isolated from rat kidney, and in liver and kidney slices. In isolated cells, these ionophores decreased the total cellular Ca content and the mitochondrial Ca.45Ca efflux from prelabelled cells was also stimulated even in the absence of extracellular Ca. In slices, the ionophore A23187 increased the total slice Ca and the uptake of45Ca. However, the mitochondria isolated from these slices treated with the ionophore had a lower total Ca and a depressed relative radioactivity. These results suggest that the increased cytosolic Ca produced by Ca ionophores may be due to mobilization of intracellular Ca stores rather than to a net shift of Ca from the extracellular fluids to the cell.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01875162
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of pH on the calcium metabolism of isolated rat kidney cells (1979)
    Springer
    The journal of membrane biology 48 (1979), S. 325-341 
    Details
    ISSN: 1432-1424
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Summary The effects of metabolic and respiratory acidosis and alkalosis on cellular calcium metabolism were studied in rat kidney cells dispersed with collagenase. In both types of acidosis, the intracellular pH, total cell calcium, and the cell relative radioactivity after 60 min of labeling are significantly depressed. Kinetic analysis of45Ca desaturation curves shows that acidosis decreases all three cellular calcium pools and depresses calcium fluxes between the superficial and cytosolic pools and between the cytosolic and mitochondrial pools. In alkalosis the intracelluar pH, the total cell calcium, and the cell relative radioactivity are significantly increased. Kinetic studies show that in alkalosis, only the mitochondrial pool is consistently increased. Calcium exchange between the mitochondrial and cytosolic pool is increased in metabolic alkalosis only. These results suggest that hydrogen ion is an important modulator of calcium metabolism, and that the intracellular pH rather than extracellular pH is the critical factor in determining the calcium status of cells during altered acid-base conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01869444
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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
    Electronic Resource
    Electronic Resource
    Knowledge and structures of scientific growth measurement of a cancer problem domain (1979)
    Springer
    Scientometrics 1 (1979), S. 171-193 
    Details
    ISSN: 1588-2861
    Source: Springer Online Journal Archives 1860-2000
    Topics: Information Science and Librarianship , Nature of Science, Research, Systems of Higher Education, Museum Science
    Notes: Abstract In the context of bridging the so-called externalist and cognitive perspectives on the growth of research communities, a cancer “problem domain” is examined (1) to distinguish a growth in knowledge from a proliferating research literature, and (2) show how measurement of formal communication, uninformed by the “historical record,” clarifies or distorts sociological interpretations of innovation and growth in biomedicine. Specifically, coauthorship and citation networks are analyzed for reverse transcriptase researchers, 1970–74. This analysis reveals the visibility of large National Cancer Institute laboratories in the research literature, but demonstrates the need to augment disaggregated network data with intellectual and social (policy) history to explain the growth and structure of the domain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02016969
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