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  • 1
    Electronic Resource
    Electronic Resource
    Evidence for normal and inhomogeneous lowermost mantle and core-mantle boundary structure under the Arctic and northern Canada (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 122 (1995), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Seismic P waves from a total of about 200 nuclear explosions in the USA, the former USSR and China, observed at 10 arrays and four networks in Europe, Canada and the USA, are used to analyse the structure at the base of the mantle and the core-mantle boundary (CMB).The simple waveforms and well-controlled source parameters of nuclear explosions allow one to use the events as source arrays in addition to the usual receiver array configuration. A new array technique (double beamforming; Krüger et al. 1993) integrating both concepts is applied, which increases the slowness resolution considerably.A total of 56 source-receiver combinations (i.e. reflection points in the lower mantle or on the CMB) could be analysed. In five regions, anomalous arrivals (PdP) with slowness and arrival times between those of P and PcP are observed. One of these five areas (Svalbard region) shows short-period PcP/P amplitude ratios, which are about three times higher than those predicted by standard earth models. In the Severnaya Zemlya region, where PdP and PcP precursors were observed previously (Krüger et al. 1993), PcP shows azimuth deviations of up to 10°. For some other regions, deviations of the PcP waveform from the direct P waveform are also observed.These anomalous phases and the PcP waveform distortions cannot be explained with standard 1-D earth models. They are probably produced by inhomogeneities in the lowermost mantle. The observed variations in the waveforms are strong indications of a laterally heterogeneous structure in two depth ranges. The first is the CMB and its immediate vicinity of a few tens of kilometres; the second region is the depth range between about 200 and 300 km above the CMB. Maps of the North Pole region, giving the distributions of inhomogeneities in the lower mantle and on the CMB, are presented. These maps show evidence of strong heterogeneity of the D″ boundary layer and possibly also of the CMB in the same area.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1995.tb07017.x
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  • 2
    Electronic Resource
    Electronic Resource
    The effect of low-velocity sediments on the mislocation vectors of the GRF array (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 108 (1992), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The GRF array is situated on Jurassic limestone of the Franconian Alb in SE Germany. The mislocation vectors show symmetry axes in their slowness and azimuth components. For the slowness the line of separation is at about 95d̀ against north. The azimuth pattern shows a symmetry axis nearly perpendicular to the axis in the slowness pattern. Waves arriving from NE have a reduced slowness, whereas waves from SW have a larger slowness. The largest azimuth anomalies are found in the directions where the slowness components change direction. These effects can to a large extent be modelled by a low-velocity sedimentary layer dipping to NNE with about 0.8d̀ dip. Such a sedimentary wedge correlates well with the geological data, is able to reproduce the observed mislocation vector pattern and explains a major part of the observed traveltime residuals. It furthermore demonstrates that local effects, like the influence of sedimentary covers, should be removed before inversion procedures and tomographic methods are applied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1992.tb00866.x
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  • 3
    Electronic Resource
    Electronic Resource
    Evidence for anomalous body-wave radiation between 0.3 and 0.7 Hz from the 1985 September 19 Michoacan, Mexico earthquake (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 101 (1990), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: In order to better understand the causes of unprecedented damage to Mexico City during the 1985 September 19 Michoacan earthquake (Mw= 8.0) spectral ratios of teleseismic P-waves of this earthquake are studied with respect to those from five recent, large Mexican subduction zone earthquakes (7.0 ≤Mw≤ 7.7). The data are from vertical-component digital seismographs. It is found that the spectral ratios at stations in the NE quadrant are anomalously more energetic than those predicted by the ω−2 source model in the critical frequency range for Mexico City (0.3-0.7 Hz). The evidence is especially convincing for the spectral ratios with respect to the earthquakes of 1985 September 21 (Mw= 7.6) and 1986 (Mw= 7.0) since the data are available from several stations in the NE quadrant. The teleseismic P-wave spectral ratio in this quadrant with respect to the 1985 September 21 earthquake, in the critical frequency range, is close to the acceleration spectral ratio found in and near Mexico City (also in the NE quadrant). Velocity traces in the epicentral region of the Michoacan earthquake, obtained by integrating the accelerograms, also show oscillations with a frequency of about 0.4 Hz. Furthermore, a regression study of Fourier acceleration spectra at a hill-zone site in Mexico City demonstrates that the Michoacan earthquake was anomalously energetic in the city at the critical frequencies for an event of that magnitude and at that distance. If the data from 7.0 ≤Mw≤ 7.7 events can be extrapolated to estimate the ground motions from Mw≥ 8.0 earthquakes, then the evidence, supports an anomalously large body-wave radiation towards Mexico City between 0.3 and 0.7 Hz during the Michoacan earthquake. This anomalous radiation and the dramatic local amplification of seismic waves in the lake-bed zone of the city (∼ 10–50 times at frequencies between 0.3 and 0.7 Hz) appear to be the principal natural causes of the disaster. The anomalous teleseismic P-wave spectral ratios with respect to the earthquakes of 1985 September 21 and 1986 found in the NE quadrant are not observed in the data available from a small number of stations in the other quadrants. If this observation is true then it suggests a directional property to the anomalous radiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1990.tb00756.x
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  • 4
    Electronic Resource
    Electronic Resource
    The organic component in dust from comet Halley as measured by the PUMA mass spectrometer on board Vega 1 (1987)
    [s.l.] : Nature Publishing Group
    Nature 326 (1987), S. 755-760 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Following the encounter of the Vega 1 spacecraft with comet Halley, the composition of cometary dust has been analysed by mass spectroscopy. Most particles consist of a predominantly chondritic core with an organic mantle composed mainly of highly unsaturated ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/326755a0
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  • 5
    Electronic Resource
    Electronic Resource
    Untersuchungen über die temperaturabhängigkeit des sauerstoffverbrauchs von Crepidula fornicata (Mollusca: Prosobranchia) (1970)
    Springer
    Marine biology 5 (1970), S. 145-153 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung 1. Die Untersuchung liefert Daten über den Sauerstoffverbrauch von Crepidula fornicata (L.) in Gewichtsbereich zwischen 0,04 und 5,2 g bei Temperaturen zwischen 2° und 30°C. 2. Die Meßdaten dienten zunächst zur Berechnung der allometrischen Parameter der Atmungsgröße für die verschiedenen Temperaturen bezogen auf das Weichkörpergewicht der Schnecken. 3. Aus diesen Parametern wurde der theoretische O2-Verbrauch für 3 Größenklassen für die einzelnen Temperaturen berechnet. Die ermittelten Daten dienten wiederum zur Bestimmung der Parameter der vom Autor vorgeschlagenen Temperaturfunktion. 4. Die graphische Darstellung (Abb. 8) zeigt ebenso wie die mathematische Analyse, daß sich die Form des Temperatureinflusses auf den Stoffwechsel im Verlauf des Wachstums ändert. Die hier vorliegenden quantitativen Beziehungen verdeutlicht die graphische Wiedergabe der Parameter der Temperaturfunktion in ihrer Abhängigkeit vom Tiergewicht. 5. Es läßt sich zeigen, daß die sehr leicht durchzuführende Wachstumsdarstellung von Ford-Walford sich auch zur Charakterisierung der kroghschen Normalkurven eignet.
    Notes: Abstract The oxygen consumption of the sessile gastropod Crepidula fornicata was measured during autumn 1962 as a function of soft body wet weight (0.04 to 5.2 g) and temperature (2° to 30° C). From the data obtained, the parameters of the allometric formula were derived for describing the relationship between respiration and body size. The parameters were then used for calculating the oxygen consumption of 3 different weight groups (0.1 g, 1.0 g, 10.0 g) at different temperatures. The resulting plot reveals different curves, demonstrating that the influence of temperature on the metabolism of C. fornicata is a function of body size. The ourves relating oxygen consumption to temperature may well be described by a modified Arrhenius-function proposed some years ago (Krüger, 1962). Biological temperature curves may be described by growth functions. Therefore, it is possible to apply the simple Walfordplot for identifying the “normal curves” of Krogh (1914).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00352598
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  • 6
    Electronic Resource
    Electronic Resource
    Vergleichende Untersuchungen über die Resistenz des Hämoglobins verschiedener Tiere (1925)
    Springer
    Journal of comparative physiology 2 (1925), S. 254-263 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00340514
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  • 7
    Electronic Resource
    Electronic Resource
    Über die katalatische Wirkung des Blutes verschiedener Wirbeltiere (1928)
    Springer
    Journal of comparative physiology 8 (1928), S. 635-657 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Es wurde bei einer größeren Zahl von Vertretern verschiedener Wirbeltierklassen — Säugetiere, Vögel, Reptilien, Amphibien und Fische — das katalatische Vermögen ihres Blutes durch Bestimmung der Katalasezahl und des Katalaseindexes untersucht, wobei sich folgendes ergab: 1. Die katalatische Wirkung des Blutes verschiedener Tierarten ist außerordentlich verschieden. Daher weichen die Werte für die Katalasezahlen wie für die Katalaseindizes, obgleich für die gleiche Tierart innerhalb gewisser individueller Schwankungsbreite mehr oder weniger konstant, bei verschiedenen Arten einer und derselben Klasse, selbst einer und derselben Ordnung, sehr stark voneinander ab. 2. Es besteht mit Bezug auf verschiedene Tierarten weder ein Parallelismus zwischen Katalasezahl und Katalaseindex, noch zwischen Katalasezahl und Blutkörperchenzahl. Bei einer und derselben Tierart dagegen gehen Katalase- und Blutkörperchenzahl mehr oder weniger Hand in Hand. 3. Auch zwischen Katalaseindex und Blutkörperchengröße liegt kein Parallelismus vor, große Blutkörperchen können einen kleinen und kleine einen großen Katalaseindex besitzen und umgekehrt. 4. Im allgemeinen ist die katalatische Fähigkeit des Blutes bei Säugetieren stark, bei Vögeln und Fischen nur sehr schwach ausgeprägt. Bei Amphibien ist sie sehr wechselnd. In bezug auf Reptilien läßt sich kaum etwas Sicheres aussagen, da die Zahl der untersuchten Arten sehr gering ist. Alle bisher untersuchten Arten (Viper und Natter von Batelli und Stern, Blindschleiche von uns) weisen eine relativ große Katalasezahl und vor allem einen auffallend hohen Katalaseindex auf. 5. Der Quotient Katalaseindex/Katalasezahl ist bei Reptilien und Amphibien sehr hoch und macht durchschnittlich das Vielfache der Katalasezahl aus. Bei den übrigen untersuchten Klassen der Wirbeltiere ist er dagegen stets kleiner als die Katalasezahl und zwar, wie es scheint, um so kleiner, auf je höherer Stufe der Entwicklung die betreffende Klasse steht, also am kleinsten bei den Säugetieren. Auf diese folgen die Vögel und auf diese endlich die Fische.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00338975
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  • 8
    Electronic Resource
    Electronic Resource
    Fehlen einer carcinogenen Wirkung von photolysiertem Diäthylnitrosamin (1967)
    Springer
    Naturwissenschaften 54 (1967), S. 591-591 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00636831
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  • 9
    Electronic Resource
    Electronic Resource
    Carcinogenicity ofβ-hydroxylated dipropylnitrosamine (1973)
    Springer
    Naturwissenschaften 60 (1973), S. 55-55 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00591776
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  • 10
    Electronic Resource
    Electronic Resource
    Induction of pancreas tumours by di-isopropanolnitrosamine (1974)
    Springer
    Naturwissenschaften 61 (1974), S. 328-328 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00599567
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