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  • Articles  (59)
  • 1985-1989  (59)
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  • 1
    Electronic Resource
    Electronic Resource
    Polyparaphenylene under pressure: Optical absorption and vibrational modes (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 1930-1934 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Optical absorption, Raman, and infrared (IR) spectra of undoped polyparaphenylene (PPP) have been studied under pressure up to 20 GPa at 300 K. PPP shows stable behavior, in marked contrast to the reactivity observed in trans-polyacetylene under pressure. The absorption edge of PPP shifts to lower energy with a total shift of 0.55 eV at 20 GPa. Raman spectra reveal a new band at about 820 cm−1 which becomes active above ∼5 GPa. At high pressure we find a considerable broadening of the infrared-active out-of-plane mode at 805 cm−1. The results are in part interpreted in terms of the larger interchain coupling induced by pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456035
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  • 2
    Electronic Resource
    Electronic Resource
    Calcium ions and polyamines activate the plasma membrane-located 1,3-β-glucan synthase (1987)
    Springer
    Planta 171 (1987), S. 130-135 
    Details
    ISSN: 1432-2048
    Keywords: Calcium (enzyme activation) ; 1,3-β-Glucan synthase ; Glycine (glucan synthase activation) ; Plasma membrane ; Polyamine ; Polycation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Sucrose-density-gradient centrifugation and partitioning in a polyethylene glycol/dextran two-phase system were used to isolate plasmamembrane vesicles from microsomal preparations of soybean cell suspension cultures. Both methods resulted in the enrichment of the activity of a 1,3-β-glucan synthase which forms a polymer consisting of more than 99% of 1,3-linked glucose (callose). Digitonin increases the 1,3-β-glucan synthase activity in the various membrane fractions to a different degree, supporting the suggestion that this enzyme is vectorially arranged in the plasma membrane. The enzyme is greatly activated either by poly-l-ornithine or synergistically by Ca2+ and spermine, indicating that the same enzyme is affected and exhibits the regulatory properties necessary for callose synthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00395076
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  • 3
    Electronic Resource
    Electronic Resource
    The catalytic subunit of cAMP-dependent protein kinase induces expression of genes containing cAMP-responsive enhancer elements (1988)
    [s.l.] : Nature Publishing Group
    Nature 336 (1988), S. 83-86 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In E. coli, cAMP regulates the expression of genes involved in sugar catabolism by binding to catabolite activator protein. Subsequent binding of the cAMP-CAP complex to specific DNA sequences activates transcription of cAMP-regulated genes11, in contrast to the eukaryotic mechanism involving A ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/336083a0
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  • 4
    Electronic Resource
    Electronic Resource
    Flag-transitive projective planes (1985)
    Springer
    Geometriae dedicata 17 (1985), S. 219-226 
    Details
    ISSN: 1572-9168
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00181588
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  • 5
    Electronic Resource
    Electronic Resource
    RandomlyH-coverable graphs (1985)
    Springer
    Periodica mathematica Hungarica 16 (1985), S. 15-22 
    Details
    ISSN: 1588-2829
    Keywords: Primary 05C70 ; Graphs ; factorization ; matching ; traceable
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract A graph israndomly matchable if every matching of the graph is contained in a perfect matching. We generalize this notion and say that a graphG israndomly H-coverable if every set of independent subgraphs, each isomorphic toH, that does not cover the vertices ofG can be extended to a larger set of independent copies ofH. Various problems are considered for the situation whereH is a path. In particular, we characterize the graphs that are randomlyP 3 -coverable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01855800
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  • 6
    Electronic Resource
    Electronic Resource
    On graphs having domination number half their order (1985)
    Springer
    Periodica mathematica Hungarica 16 (1985), S. 287-293 
    Details
    ISSN: 1588-2829
    Keywords: Primary 05C35 ; Connected graphs ; domination number ; product of graphs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract In this paper we present a characterization of connected graphs of order 2n with domination numbern. Using this class of graphs, we determine an infinite class of graphs with the property that the domination number of the product of any two is precisely the product of the domination numbers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01848079
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  • 7
    Electronic Resource
    Electronic Resource
    Electron energy-loss spectroscopy applied to solids (1985)
    Springer
    The European physical journal 61 (1985), S. 463-468 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Several illustrating examples of recent electron energy-loss investigations of the electronic structure of solids are reviewed. In particular, studies on rare-gas bubbles in metals, on conducting polymers, and onL 2,3 edges of 3d transition metals are reported. Moreover, the electron energy-loss spectrometer, which was used for these investigations, is described briefly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01303554
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  • 8
    Electronic Resource
    Electronic Resource
    Is Nd2−xCexCuO4 an electron-superconductor? (1989)
    Springer
    The European physical journal 75 (1989), S. 421-422 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present results from electron energy-loss spectroscopy on Nd2−xCexCuO4. There is no clear evidence for Cu1+ but for holes at the oxygen sites. The valency of Ce is found to be close to 3.4. Thus our results do not corroboraten-type superconductivity in this compound.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01312517
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  • 9
    Electronic Resource
    Electronic Resource
    Experimental electronic structure studies of La2−x Sr x CuO4 (1987)
    Springer
    The European physical journal 67 (1987), S. 9-14 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract X-ray induced photoelectron spectroscopy, bremsstrahlung-isochromat spectroscopy, and electron energy-loss spectroscopy were used to investigate the electronic structure of the high-temperature superconductor La2−x Sr x CuO4. In general, good agreement was obtained with band structure calculations of the tetragonal phase of La2CuO4. Near the Fermi energyE F the systems shows forx=0 a smeared out gap or a region of very low density of states ∼2eV wide. Upon replacement of La by Sr, the gap is filled with defect states, the intensity of which is proportional tox. The experimental data are not consistent with the closing of a Peierls gap alone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01307300
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  • 10
    Electronic Resource
    Electronic Resource
    Determination of zinc bacitracine in feeding-stuffs by electrophoresis (1985)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 321 (1985), S. 169-171 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary For the assay of zinc bacitracine in premixtures and formulated feeding-stuffs, an analytical method including gel filtration and electrophoresis is described. The application of the assay to trade samples proved high recovery rates (99.4%; total error 9.6%). At the same time it was demonstrated that an extension of the extraction time cannot improve the detectability (∼5 ppm). Influences of feed ingredients and technical procedures are diminished by prior microfiltration. However, the comparatively long duration of the analysis (48–72 h) must be regarded as disadvantageous.
    Notes: Zusammenfassung Zur Bestimmung von Zink-Bacitracin in Futtermitteln und deren Vormischungen wurde ein Verfahren ausgearbeitet, das auf Gelfiltration und Elektrophorese beruht. Bei der Anwendung auf Handelsproben ergaben sich Wiederfindungsraten von 99,4% bei einem Gesamtfehler von 9,6%. Die Nachweisbarkeit (∼5 ppm) kann durch verlängerte Extraktionszeit nicht verbessert werden. Der Einfluß anderer Bestandteile und der technischen Prozesse wird durch Mikrofiltration verringert. Die relativ lange Analysendauer (48–72 h) ist allerdings von Nachteil.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01117758
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