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  • Articles  (70)
  • Springer  (67)
  • Institute of Physics  (3)
  • 1985-1989  (54)
  • 1935-1939  (16)
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  • Articles  (70)
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  • 1
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present the measurements of the spin correlation parameterA ookk (np). A longitudinally polarized beam of free neutrons obtained from the break-up of polarized deuterons was scattered on the longitudinally polarized Saclay frozen-spin proton target. Measurements were carried out at SATURNE II, at neutron beam kinetic energies of 0.63, 0.88, 0.98 and 1.08 GeV. The data points cover the angular region from about 40° to 110° CM. The observed angular dependence ofA ookk (np) at 0.63 GeV agree with the phase shift analysis predictions except at small angles.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Oecologia 68 (1986), S. 580-584 
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The effects of host plant patch size on the abundances of two specialist herbivores (the chrysomelid beetle, Acalymma innubum and the pentatomid bug, Piezosternum subulatum) were investigated in a natural forest community in the Virgin Islands. Abundances were compared early and late in the season in different sized patches of the cucurbit host plant (Cayaponia americana) growing in open habitat (with no surrounding plant community) and forest habitat (with diverse surrounding plant community). For both herbivore species, adult abundances per patch were positively correlated with patch leaf area, but there was a significant patch size effect (i.e., correlation between herbivore density per unit plant and patch leaf area) only for beetles in the forest habitat. Both herbivore species were significantly affected by surrounding plant diversity, but in opposite ways: beetles were more abundant in open patches whereas bugs were more abundant in forest patches. Relationships between abundance and patch size in open and forest patches changed through the season for both herbivore species. These changing abundance patterns are discussed with respect to (1) increases in the diversity of the plant community surrounding host plant patches, and (2) differences in herbivore movement patterns.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Archive for history of exact sciences 40 (1989), S. 173-206 
    ISSN: 1432-0657
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Current genetics 12 (1987), S. 527-534 
    ISSN: 1432-0983
    Keywords: Fission yeast ; OMPdecase ; Cloning ; Gene expression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary URA4, the gene coding for orotidine monophosphate decarboxylase (OMPdecase), has been cloned from the fission yeast by homologous complementation and restricted in an Escherichia coli-Schizosaccharomyces pombe (E. coli-S. pombe) replicative plasmid to a 1.76 kb HindIII fragment. This plasmid is maintained at a high copy number in S. pombe and allows OMPdecase expression in Saccharomyces cerevisiae (S. cerevisiae) as well as in E. coli. After characterisation by restriction mapping and Southern hybridisation, the cloned gene was used as a probe to measure URA4 transcription and to examine its regulation. Messenger RNA levels were measured by DNA/RNA filter-hybridisation with pulse labelled RNAs during 6-azauridine (6-AUR) inhibited growth in wild type and 6-AUR sensitive strains. We found that in S. pombe the OMP analogue 6-AUR does not regulate the level of OMPdecase formation as it does in S. cerevisiae but rather modifies the ratio of total polyA+ to polyA− RNAs in the cell. Based on these results and on corresponding enzyme activities this study demonstrates divergent pyrimidine pathway regulation in the two yeasts S. cerevisiae and S. pombe. Finally, we propose the use of the URA4 gene as a convenient selective marker for genetic engineering in S. pombe.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Meteorology and atmospheric physics 35 (1985), S. 323-339 
    ISSN: 1436-5065
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Description / Table of Contents: Zusammenfassung Zur Abschätzung einer möglichen Klimaänderung als Folge einer Verdopplung der CO2-Konzentration in der Atmosphäre dienen die Ergebnisse von Studien mit drei-dimensionalen Modellen der atmosphärischen Zirkulation. Diese Ergebnisse können nicht als Klimavorhersagen betrachtet werden, da die gegenwärtigen Modelle noch erhebliche Mängel aufweisen. Sie bilden jedoch die Grundlage zur Entwicklung von Klimaszenarien. Klimamodelle sind gegenwärtig die einzigen Hilfsmittel, um die Reaktion des Klimasystems auf eine externe Störung in physikalisch konsistenter Weise und in hoher zeitlicher und räumlicher Auflösung zu simulieren. Für den Mittelmeerraum werden die Ergebnisse dreier verschiedener Klimamodelle (British Meteorological Office (BMO); Goddard Institute for Space Studies (GISS); National Center for Atmospheric Research (NCAR)) anhand der regionalen und saisonalen Verteilungen von Temperatur, Niederschlag und Bodenfeuchte vorgestellt. Die durch einen CO2-Anstieg verursachte Änderung der Temperaturverteilung ist bei den drei Modellergebnissen ähnlich. Die räumlichen Mittelwerte liegen zwischen 2,5 und 4,0 K. Der Vergleich der Verteilung hydrologischer Größen ergibt dagegen kein einheitliches Bild. Die den simulierten Klimaänderungen zugrunde liegenden physikalischen Mechanismen werden benannt und die statistische Signifikanz der Klimaänderung wird getestet. Diese Arbeit dient zur Entwicklung einer Methodologie für den Einsatz von Klimamodellszenarien bei der Impaktanalyse.
    Notes: Summary For the estimation of a potential climatic change induced by a doubling of atmospheric CO2 we use the results of three-dimensional general circulation models (GCM). Although the results from present climate modeling cannot be considered as predictions of future climatic conditions due to the inherent models' deficiencies, they can still serve a useful purpose in climate change scenarios. The reason for this is that climate models are the only tools available to study the response of the climate system to a perturbation in a physically consistent manner and that such types of models can provide a consistent data set of high temporal and spatial resolution. For the Mediterranean area, the results obtained from three different GCMs, namely, the British Meteorological Office model (BMO), the Goddard Institute for Space Studies model (GISS), and the National Center for Atmospheric Research model (NCAR) are shown. The regional and seasonal distributions of temperature, precipitation, and soil moisture are used to study the potential changes. The results indicate that the CO2-induced changes for temperature generated by the three models are of similar magnitude. The values of the area mean change range between 2.5 and 4.0 K. The precipitation response results in a diverse pattern. The physical mechanism likely to be responsible for the simulated climatic changes are identified and their statistical significance is tested. This type of work will help us develop the methodology and assist us in gaining insight into the use of climate model scenarios for impact analysis.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Letters in mathematical physics 13 (1987), S. 237-244 
    ISSN: 1573-0530
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract In Abelian subalgebras of observables it is shown that the integral representations of states in terms of coherent states result from the indistinguishability of the quanta of the harmonic oscillator under consideration. It is argued that these integral representations contain a quantum de Finetti theorem on Bose-Fock space.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Letters in mathematical physics 15 (1988), S. 75-79 
    ISSN: 1573-0530
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract The quantum harmonic oscillator can be considered as a composite system of indistinguishable Bose-Einstein symmetric two-level-systems (quanta). In analogy to the classical Poisson limit theorem, we show that a coherent state is the limit of a sequence of homogeneous product states (coherent spin states) and discuss statistical properties of the quanta in classical and nonclassical states.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Letters in mathematical physics 9 (1985), S. 103-106 
    ISSN: 1573-0530
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract The probability measures which determine the statistics of the number operator of a quantum harmonic oscillator in a classical state, constitute a convex set. By means of von Weizsäcker and Winkler's generalization of Choquet's theory, it is shown that this set is a simplex.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Foundations of physics 18 (1988), S. 639-649 
    ISSN: 1572-9516
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The consequences of the following definition of indistinguishability are analyzed. Indistinguishable classical or quantum particles are identical classical or quantum particles in a state characterized by a probability measure, a statistical operator respectively, which is invariant under any permutation of the particles. According to this definition the particles of classical Maxwell-Boltzmann statistics are indistinguishable.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Archives of environmental contamination and toxicology 14 (1985), S. 299-306 
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract Prochloraz (N-propyl-N-[2-(2,4,6-trichlorophenoxy)ethyl]-1H-imidazole-1-carboxamide) is a new agricultural fungicide. When administered in the diet, it induced hepatic and intestinal cytochrome P-450 levels and monooxygenase activities from Japanese quail (Coturnix coturnix), grey partridge (Perdix perdix), chicken (Gallus gallus), and pheasant (Phasianus colchicus). After administration of a single dose to quail, prochloraz acted biphasically,i.e. inhibited, then induced aniline hydroxylase activity. In close relation with this biphasic pattern, pentobarbital sleeping time and toxicity of the insecticide parathion were modified. Administration of prochloraz at various dose levels in the diet of quail did not influence fecundity, fertility, and development of progeny.
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