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  • American Physical Society  (68)
  • Springer  (34)
  • 1960-1964  (52)
  • 1950-1954  (46)
  • 1920-1924
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 18 (1962), S. 468-470 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Eine Methode zur Messung der Potenzierung von Tranquilizern und Analgetika auf Äthanoldepression wird beschrieben. Unbeweglichkeit von Mäusen wird als Kriterium der Depression genommen. Die fünf Tranquilizer, die gebraucht wurden, haben Äthanol in verschiedenen Graden potenziert. Von den drei analgetischen Drogen hat Morphin, nicht aberd-Propoxyphen und Codein, Äthanolnarkose potenziert.
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  • 2
    Electronic Resource
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    Springer
    Cellular and molecular life sciences 19 (1963), S. 177-178 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Die Totalsynthesen von (±)-Östron, (±)-d-homo-Equilenin-methyläther und (±)-iso-Equilenin werden beschrieben.
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  • 3
    Electronic Resource
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    Springer
    Zeitschrift für angewandte Mathematik und Physik 13 (1962), S. 1-13 
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Zusammenfassung Der magneto-gas-dynamische Wirbelgenerator mit strahlenförmigem Magnetfeld wird theoretisch untersucht. Geschwindigkeitsprofile, elektrische Kenngrössen und Wirkungsgrade werden unter Berücksichtigung der Induzierten Ströme und Felder besprochen.
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  • 4
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Von mehreren (±) 3-Oxy- und (±) 3-Methoxy-13-alkylgona-1,3,5(10)trien-17-onen und verwandten Verbindungen, einschliesslich von Vertretern der (±) 13-Alkylgon-4-en-3-on-Reihe, werden Totalsynthese und biologische Wirksamkeit beschrieben.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für angewandte Mathematik und Physik 15 (1964), S. 573-581 
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Zusammenfassung Der Einfluss eines transversalen Druck-Gradienten auf die Stabilität einer Couette-Strömung ist durch direkte Lösung der Differentialgleichungen untersucht worden. Es stellt sich heraus, dass für besondere Werte von Drehzahl und Druck-Gradient die Kurve der neutralen Stabilität zwei Minima besitzt; dies führt zu unstetigem Verhalten der kritischen Wellenzahl. Eingehende Resultate sowohl für die Eigenwerte (Taylor-Zahl und Wellenzahl) als auch die Eigenfunktionen (Radial- und Transversal-Komponenten der Störungsgeschwindigkeit) werden hier vorgelegt für den Fall, dass der äussere Zylinder still steht.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 16 (1960), S. 357-358 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Die Darstellung der beiden epimeren C21-Methylderivate des 9α-Fluorprednisolons wird beschrieben. 9α-Fluor-21-methyl-1, 4-pregnadien-11β, 17α, 21B-triol-3, 20-dion-21-azetat ist ein hochwirksames entzündungshemmendes Steroid, vollkommen frei von Nebenwirkungen der Natrium- und Wasserretention des C21-unsubstituierten 9α-Fluorprednisolons.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Archiv der Mathematik 15 (1964), S. 401-403 
    ISSN: 1420-8938
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
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  • 8
    Electronic Resource
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    Springer
    Chromosoma 4 (1950), S. 1-55 
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The distinguishing cytological characters, including chromosome number and sex chromosome mechanism, have been tabulated for all mantids thus far studied cytologically—including 16 species (starred in Table 1) not hitherto examined. Data on 46 species in 17 subfamilies are reviewed. The XO♂—XX ♀ sex chromosome mechanism represents the ancestral condition for the family and has been retained in 14 of the subfamilies sampled. The distribution of the X1X2Y♂—X1X1X2X2♀ mechanism, previously known in the subfamilies Manteinae and Choeradodinae, is extended to include Mellierinae, Acromantinae and Vatinae. Cytological evidence indicates a monophyletic origin of the compound sex chromosomes and necessitates a reconsideration of the taxonomic association of XO and X1X2Y forms in the same subfamily, specifically of Miomantis and Callimantis with the other Manteinae, and Aethalocroa with Vates and Phyllovates in the Vatinae. The pre-metaphase stretch is established as a regular stage in male meiosis in 14—and is absent in 3—of the species checked for this character. It should prove of taxonomic value when a wider sampling of the lower categories is available. The prolongation of parallel pairing of homologous chromosomes in male meiosis appears to be characteristic of the Manteidae as a whole. No correlation is apparent between the degree of its expression and taxonomic category. Since it provides a mechanism, additional or alternative to chiasmata, for the post-pachytene association of homologues, its establishment permits the evolution of non-chiasmate meiosis in the group. Two structural types of bivalents—one with, one without chiasmata—are found. Present evidence favors the multiple origin of the non-chiasmate type within the family, and since both types may coexist in the karyotype of the same sex of a single species, presence or absence of chiasmata cannot be considered a valid taxonomic criterion.
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  • 9
    Electronic Resource
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    Springer
    Chromosoma 3 (1950), S. 1-21 
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary 1. The pre-metaphase stretch is found to be a normal stage in male meiosis in six species of phasmids. 2. Its essential features are a precocious orientation of the kinetochores and their movement toward opposite poles of the developing spindle in first meiotic prophase, — with a consequent stretching of the chromosomes. It is followed by recontraction of the chromosomes and their movement to the equator. Attraction beween kinetochore and center, reinforced by the effect of elongation of the spindle, is considered responsible for the movements of the stretch. 3. The pre-metaphase stretch in phasmids differs from that of mantids in (1) its timing relative to meiotic stage, and (2) its expression in one species in the prophase of both meiotic divisions. 4. The distribution of the stretch in nature, and its significance for the mechanism of mitosis are discussed.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Chromosoma 3 (1950), S. 52-65 
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The sex chromosomes of the male phasmid Isagoras schraderi Rehn comprise an X and a Y, — each with a submedian kinetochore, and one euchromatic and one heterochromatic arm. At meiosis X and Y form an unequal sex bivalent in which the euchromatic arms are terminally associated. Relatively recent reversion from the XO-XX mechanism characteristic of the Phasmidae is indicated by the presence of the euchromatic arm in both X and Y. The diploid number of the male is 34. Unequal autosomal bivalents are found at meiosis in two other species of Isagoras — Isagoras subaquiles Rehn and Isagoras sp. — and in Pseudophasma menius Westwood. The chromosome complements of these species are described.
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