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  • 1
    Electronic Resource
    Electronic Resource
    Der Einfluß körperlicher Belastung auf Blutgerinnung und Fibrinolyse bei untrainierten Personen und Hochleistungssportlern (1968)
    Springer
    Journal of molecular medicine 46 (1968), S. 712-716 
    Details
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Blood coagulatio and fibrinolysis were studied on 25 untrained male volunteers and on 10 highly trained athletes immediately after graduated exercise on a bicycle ergometer. We found, in particular, a shortening of the reaction time in the thrombelastogram, an accelerated thrombin formation and increased thrombin activity in the thrombin generation test, an increase of factor VIII activity, a shortening of thromboplastin times and a shortening of euglobulin lysis times in relationship to the degree of physical stress. Measurement of the three latter changes was conducted on a comparative basis between untrained subjects and highly trained athletes. Here the athletes showed lesser increases in activity as regards coagulation and fibrinolysis, in comparison to untrained persons of the same age during a standard exercise of 150 Watts. During maximal ergometer exercise the values of both test groups corresponded with one another to a large extent.
    Notes: Zusammenfassung Bei 25 untrainierten jugendlichen Versuchspersonen und 10 Hochleistungssportlern wurde das Verhalten der Blutgerinnung und Fibrinolyse während einer abgestuften Ergometerbelastung mit Hilfe verschiedener Methoden untersucht. Im einzelnen konnten eine Verkürzung der Reaktionszeit im Thrombelastogramm, eine beschleunigte Thrombinbildung und gesteigerte Thrombinaktivität im Thrombinbildungstest, eine Zunahme der Faktor VIII-Aktivität, ein Anstieg der Quick-Werte und eine Verkürzung der Euglobulin-Lysezeiten in Abhängigkeit vom Grad der körperlichen Belastung nachgewiesen werden. Die Messung der drei letztgenannten Veränderungen erfolgte vergleichend bei untrainierten Versuchspersonen und Hochleistungssportlern. Dabei zeigten die Sportler während einer Standardbelastung von 150 Watt hinsichtlich der Gerinnung und Fibrinolyse geringere Aktivitätssteigerungen als die Untrainierten gleichen Alters. Während maximaler Belastung glichen sich die Werte beider Versuchsgruppen weitgehend an.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01731159
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  • 2
    Electronic Resource
    Electronic Resource
    A specific chromosome element, the telomere of Drosophila polytene chromosomes (1968)
    Springer
    Chromosoma 25 (1968), S. 184-197 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The submicroscopic organization of terminal chromosome regions of Drosophila hydei polytene chromosomes is described. A compact region composed of tightly packed fibrils of 100 to 125 Å diameter embedded in an amorphous material is located at each of the chromosome ends of the 5 long chromosome arms. From this compact region, sometimes containing cavities, fibrils extend onto the nearest normal band region. The diameter of the extending fibrils is 100–125 Å, 200–250 Å or 400 Å. Pronase digestion of fixed and squashed chromosomes reduced the electron density of the amorphous matrix in the compact regions but failed to affect the diameter of the fibrils. The extending fibrils, however, showed a decrease in diameter after pronase digestion. The most frequently observed diameter values were 100–125 Å. — The volume of the terminal structures, including the compact region as well as the extending fibrils, is characteristically different for the various elements of the karyotype. Chromosome 2 displays the largest terminal structure, whereas chromosome 4 only occasionally shows the presence of compact regions. — End to end association of the long chromosome arms involves the fusion of the compact terminal structures. The non-random distribution of end to end association seems to be correlated with the volume of the terminal structures. Chromosome 2 which contains the largest compact terminal region is more frequently involved in end to end associations than any other chromosome arm. — The terminal regions show replication of DNA. They belong to the group of regions which display a discontinuous labeling pattern along the chromosomes, representing a late phase of the replication cycle. — The unique structural organization of the terminal chromosome regions, which is never observed at any other location of the genome supports the idea that they are morphological manifestations of the postulated telomeres.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00327177
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  • 3
    Electronic Resource
    Electronic Resource
    Der Übergang zur Supraleitung in Sinterproben des Systems Nb-Sn (1966)
    Springer
    The European physical journal 189 (1966), S. 191-198 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract For samples of the system Nb-Sn sintered between 700 and 1500°C with 20 and 25 percent Sn the inductive and resistive transition to superconductivity has been measured. Especially the influence of magnetic fields on the transition has been examined. The inductive transition is deduced from shielding currents, the anomalous rise of the transition temperature for the 4Nb∶1Sn-samples first found byJansen turns out to be a consequence of higher critical currents of these samples. At low sintering temperatures a rise of the critical fields has been observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01327155
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  • 4
    Electronic Resource
    Electronic Resource
    Das Eindringen eines schwachen Magnetfeldes in Supraleiter aus Nb3Sn, Nb3Al und V3Si (1966)
    Springer
    The European physical journal 189 (1966), S. 199-206 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The temperature variation of the initial suszeptibility has been measured for bulk sintered and diffusion samples as well as for finely ground sintered and melted samples of superconducting Nb3Sn, Nb3Al, and V3Si. Penetration effects must be accounted for the width of the inductive transition curve if the interior of the sample is not completely shielded by current loops. Absolute values of the penetration depths after extrapolating to zero temperature were estimated to (0,18±0,04) μ for Nb3Sn, (0,19±0,04) μ for Nb3Al, and (0,27±0,05) μ for V3Si. The transition temperature obtained by suszeptibility measurements is lowered with decreasing grain size.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01327156
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  • 5
    Electronic Resource
    Electronic Resource
    Messung der Elektronenbeugungsintensitäten polykristalliner Aluminiumschichten bei tiefer Temperatur und Vergleich mit der dynamischen Theorie (1965)
    Springer
    The European physical journal 182 (1965), S. 380-397 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract By means of a retarding field apparatus the electron diffraction intensities of a polycrystalline Aluminium-foil have been measured for different electron energies between 17 and 50 kev. The specimen was kept at 154 °K and the thickness of the crystallites was about 280 Å. It has been shown that the high index reflections behave kinematically, while the first order reflections [e.g. (111), (200)] are much influenced by dynamical extinction effects which can be explained very well by the dynamical two beam approximation. Also the intensities of the higher orders [e.g. (222), (400)] of the strong reflections show marked deviations from the kinematical values. This intensity deficit can be interpreted by multiple scattering processes due to systematic interactions. The experimental results are compared with the second Bethe approximation (introduction of dynamic potentials) as well as with the second Born approximation where double scattering processes within the crystal are taken into account.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01383118
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  • 6
    Electronic Resource
    Electronic Resource
    Der Einfluß von Strom und Magnetfeld auf die Supraleitungseigenschaften von Nb3Sn-, V3Ga- und V3Si-Diffusionsschichten (1965)
    Springer
    The European physical journal 183 (1965), S. 412-423 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract For diffusion layers of Nb3Sn, V3Ga, and V3Si on niobium and vanadium wires, respectively, the transition to superconductivity has been measured at various currents in longitudinal and transverse magnetic fields. Current and field shift the transition curve to lower temperatures, except near the onset of superconductivity where the core of the wire influences the transition. The critical current vs. temperature curves are linear at higher currents, the critical field curves are bended. The results are explained by local variations of the transition temperature due to inhomogeneities and by a displacement of the current paths under the influence of the Lorentz force. For very thin diffusion layers an influence of thickness on the transition temperature has been observed. In addition quenching curves of the diffusion layers have been measured. The shape is in accordance with the model ofKim and coworkers. The absolute values and deviations at higher fields are discussed. A deduction of the critical values at low temperatures from measurements near the transition is possible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01380768
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