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  • Electronic Resource  (17)
  • 1970-1974  (11)
  • 1965-1969  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Transition Metal Complex Promoted Rearrangements. The Effect of the Metal and of the Attached Ligands on the Mode of Cleavage of Methylated Bicyclo[1.1.0]butanes (1972)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 94 (1972), S. 7741-7748 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00777a602
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  • 2
    Electronic Resource
    Electronic Resource
    Mechanistic study of the reactions of 1,2-disubstituted alkenes with hydrogen bromide in acetic acid (1974)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 96 (1974), S. 1858-1866 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00813a035
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  • 3
    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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  • 4
    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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  • 5
    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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  • 6
    Electronic Resource
    Electronic Resource
    The application of similarity analysis to the vegetative growth of AVENA SATIVA (Oats) (1973)
    Springer
    International journal of biometeorology 17 (1973), S. 321-327 
    Details
    ISSN: 1432-1254
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01554060
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  • 7
    Electronic Resource
    Electronic Resource
    On a free interface problem for linear ordinary differential equations and the one-phase Stefan problem (1970)
    Springer
    Numerische Mathematik 16 (1970), S. 248-267 
    Details
    ISSN: 0945-3245
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract A numerical method for the solution of the one-phase Stefan problem is discussed. By discretizing the time variable the Stefan problem is reduced to a sequence of free boundary value problems for ordinary differential equations which are solved by conversion to initial value problems. The numerical solution is shown to converge to the solution of the Stefan problem with decreasing time increments. Sample calculations indicate that the method is stable provided the proper algorithm is chosen for integrating the initial value problems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02219777
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  • 8
    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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  • 9
    Electronic Resource
    Electronic Resource
    Differentiation of the synaptonemal complex and the kinetochore in Locusta spermatocytes studied by whole mount electron microscopy (1973)
    Springer
    Chromosoma 44 (1973), S. 231-253 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract When Locusta migratoria spermatocytes are surface-spread on various salines, the axial element of leptotene and zygotene chromosomes, and the synaptonemal complex of pachytene chromosomes are well-preserved, although, in most instances, virtually denuded of chromatin. A complex association of chromosome ends with the nuclear membrane is apparent as early as leptotene, and, as pairing is initiated, the nuclear attachment points of the partner half-bivalents fuse, apparently incorporating additional membrane material between them. The meiotic kinetochore originates in association with the axial element during early prophase, and prior to synaptonemal complex formation and chromosome condensation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00329119
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  • 10
    Electronic Resource
    Electronic Resource
    Leukemic xanthomatosis with a missing No. 9 chromosome (1972)
    Springer
    European journal of pediatrics 112 (1972), S. 251-260 
    Details
    ISSN: 1432-1076
    Keywords: Xanthomatosis ; Myelocytic Leukemia ; Cytochemistry ; Missing No. 9 Chromosome ; Giemsa Banding Technique
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Ein 2 Jahre altes Mädchen mit chronischer Rhinobronchitis, Hepatomegalie, Milchkaffeeflecken, Hautxanthomen, geistiger und körperlicher Retardierung und dem Blutbild einer myeloischen Leukämie wird beschrieben. Eine Behandlung mit Prednison und 6-Mercaptopurin führte zur deutlichen Besserung der Symptome. Durch licht- und elektronenmikroskopische Cytochemie konnten die atypischen Zellen als Parametamyelocyten eingeordnet werden. Chromosomenanalysen von Blut und Knochenmark zeigten vor allem im Knochenmark einen Zellklonus mit einem fehlenden C-Chromosom. Das fehlende Chromosom konnte mit Hilfe einer modifizierten Giemsa-Bandentechnik als Nr. 9 erkannt werden.
    Notes: Abstract A 2 year old girl with chronic rhinobronchitis, hepatomegaly, café-aulait spots, skin xanthomas, mental and physical retardation and a blood picture of myelocytic leukemia is described. Treatment with prednisone and 6-mercaptopurine markedly improved the symptoms. The atypical cells could be classified as (para)metayelocytes by light and electron microscopic cytochemistry. Chromosome analysis of blood and bone marrow revealed a predominant cell clone in the bone marrow with a missing C-chromosome. The missing chromosome could be identified as a No. 9 by a modified Giemsa banding technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00464618
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