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  • 1965-1969  (6)
  • 1955-1959  (7)
  • 1
    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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  • 2
    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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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    Kernstreuung schwach relativistischer Myonen (1955)
    Springer
    The European physical journal 143 (1955), S. 17-30 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Zusammenfassung Für Myonen beiderlei Vorzeichens wird die Streuverteilung bei Quecksilberkernen im Energiebereich von etwa 30 MeV angegeben. Die Berechnung geschieht mit Hilfe eines auf dieDirac-Gleichungen zugeschnittenen WKB-Verfahrens, wobei dessen Anwendbarkeit jedoch nicht auf den hier interessierenden schwach relativistischen Energiebereich beschränkt ist. Die für die beiden Kernradien 1,2 · 10−13 ·A 1/3 cm und 1,4 · 1013 ·A 1/3 cm gefundenen Ergebnisse lassen es sinnvoll erscheinen die zum Problem der Größe des Kernradius ausgeführten Experimente durch Streuversuche mit Myonen zu ergänzen, falls es möglich wird in dem genannten Energiebereich mit ausreichender Teilchenstromdichte und Energiehomogenität zu experimentieren.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01330693
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  • 5
    Electronic Resource
    Electronic Resource
    Über den Bau der Pigmentgranula bei den Myxomyceten (1957)
    Springer
    Naturwissenschaften 44 (1957), S. 449-449 
    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/BF00629292
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  • 6
    Electronic Resource
    Electronic Resource
    Untersuchungen an einer parasitischen Ameise (1955)
    Springer
    Insectes sociaux 2 (1955), S. 163-171 
    Details
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Summary 1. The male ofAnergates shows a reduction of some parts of the digestive system and the musculature of the skeleton. The volume of the brain is reduced by reduction of association centres. The anatomy of the female corresponds to a free-living species, only the stinging apparatus cannot be found. 2. During the reproductive phase a remarkable enlargement of all somatic cells takes place due to polyploidy with exception of the nervous system. To strengthen the exoskeleton the intersegmantal membranes are hardening. 3. As result of isolation ofAnergates certain analogies to regressive evolution of some cave animals are noted.
    Abstract: Résumé 1o Le mâle d'Anergates présente une réduction de la musculature squelettique et de quelques parties du tractus digestif. Le volume des ganglions cérébroïdes est diminué par suite de la réduction des centres d'association. L'anatomie de la femelle rappelle celle des femelles sauvages, à ceci près que l'aiguillon et ses annexes sont absents. 2o A part les cellules nerveuses, toutes les cellules somatiques de l'image subissent une croissance remarquable à cause de leur polyploïdie. Les membranes intersegmentales se durcissent et renforcent l'exosquelette. 3o Eu égard à l'isolement d'Anergates, on peut constater certaines analogies entre les phénomènes régressifs qu'il présente et ceux rencontrés chez des animaux cavernicoles.
    Notes: Zusammenfassung 1. Beim ♂ vonAnergates ist neben Teilen des Darmtraktes besonders die Skelettmuskulatur zurückgebildet. Das Gehirnvolumen wurde auf Kosten der assoziativen Zentren herabgesetzt. Der Bau des ♀ entspricht dem einer freilebenden Art, lediglich der Stachelapparat ist nicht mehr nachweisbar. 2. Postimaginal findet beim ♀ eine auffallende Vergrößerung aller Somazellen statt, für die — mit Ausnahme des Nervensystems — Polyploidisierungsvorgänge verantwortlich sind. Zur Festigung des Exoskeletts verhärten die Intersegmentalhäute. 3. Als Folge der Isolierung vonAnergates sind gewisse Analogien zur regressiven Evolution mancher Höhlentiere festzustellen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02224101
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  • 7
    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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  • 8
    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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  • 9
    Electronic Resource
    Electronic Resource
    Elektronenmikroskopische Untersuchungen an den Apáthyschen Neurofibrillen von Hirudo medicinalis L (1957)
    Springer
    Cell & tissue research 45 (1957), S. 538-542 
    Details
    ISSN: 1432-0878
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00338677
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  • 10
    Electronic Resource
    Electronic Resource
    Elektronenmikroskopische Untersuchungen ah den Corpora cardiaca von Carausius morosus. Br. (1958)
    Springer
    Cell & tissue research 48 (1958), S. 556-564 
    Details
    ISSN: 1432-0878
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Elektronenmikroskopische Untersuchungen an den Corpora cardiaca ergaben, daß 2 Drüsenzelltypen auftreten. Die osmiophilen Zellen enthalten Granula, die oft auf bestimmte, klarumgrenzte Bezirke beschränkt sind. Das Cytoplasma der osmiophoben Drüsenzellen ist von einem Vacuolensystem durchsetzt. Es umschließt konzentrisch geschichtete Lamellenkörper und eigenartige, sehr lange, fibrillär differenzierte Mitochondrien. Die Endkeulen der neurosekretorischen Zellen des Protocerebron reichen teilweise bis an die Kernmembran der osmiophoben Drüsenzellen. Die Nervenendigungen enthalten Sekretgranula, die den für die Nervenendigungen des Hypophysenhinterlappens beschriebenen größenordnungsmäßig (500–2000 Å) und hinsichtlich ihrer Struktur entsprechen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00342731
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