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  • 1
    Electronic Resource
    Electronic Resource
    Resource quality and spatial variation in sex ratios of a free-living solitary sawfly, Dineura virididorsata (Hym., Tenthredinidae) (1993)
    Springer
    Oecologia 96 (1993), S. 420-425 
    Details
    ISSN: 1432-1939
    Keywords: Biased sex ratios ; Dineura virididorsata ; Sex-related survival ; Local mate competition ; Foliage quality
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The sex ratio in final-instar larvae of a birch-feeding, free-living solitary sawfly, Dineura virididorsata, was investigated in Finnish Lapland. The prepupal proportion of females, pooled over ten sites, was 56%, and at four individual sites the sex ratio was significantly female-biased. Larval survival from egg to prepupae did not differ between the sexes. This suggests a femalebiased primary sex ratio in the field. The sex ratio varied among the sites but not among host trees within sites. Contrary to previous results with hymenopterans, we did not find that differences in the sex ratio depended on forage quality: site-specific or tree-specific sex ratios did not correlate with the average prepupal weight. A literature search indicated that female-biased sex ratios are also common in other free-living sawflies. We are unable to explain sex ratios of Dineura virididorsata or other free-living sawflies with existing general models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00317514
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  • 2
    Electronic Resource
    Electronic Resource
    Reproductive behaviour of mated and virgin females of a solitary sawflyDineura virididorsata (1994)
    Springer
    Entomologia experimentalis et applicata 70 (1994), S. 83-90 
    Details
    ISSN: 1570-7458
    Keywords: Hymenoptera ; Symphyta ; Tenthredinidae ; Dineura virididorsata ; sawfly ; sex ratio ; oviposition behaviour ; mating behaviour
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Sex ratios of the arrhenotokous sawflyDineura virididorsata Retz. (Hymenoptera: Tenthredinidae) are variable among populations in the field, but are biased in favour of females. We have concluded elsewhere that the sex ratios of this species cannot be satisfactorily explained by any general sex ratio model that is available. Here we present data on the different behavioural traits that are relevant to interpretation of the evolution of female-biased sex ratios under local mate competition. We report on oviposition behaviour, mating behaviour and the patterns of movement of ovipositing virgin and mated females. Our results show that adult emergence is synchronous and females will mate daily with different males (in the laboratory, at least). This would decrease the relatedness of offspring should it also take place in the field. In addition, ovipositing females (mated and virgin) leave their site of release in a relatively short time and deposit few eggs relative to their capabilities, so siblings are unlikely to be clumped. The time that virgins spend in deposition of an egg is not different from that spent by mated females, so there is no differential ‘investment’ in this regard. These behavioural observations agree with our previous conclusion that the preconditions of current sex ratio theories are not met byD. virididorsata.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02380634
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  • 3
    Electronic Resource
    Electronic Resource
    Neue Richtungen in der Polyvanadat-Chemie: Von Käfigen und Clustern zu Körben, Bändern, Schalen und Fässern (1992)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 104 (1992), S. 51-53 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19921040108
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  • 4
    Electronic Resource
    Electronic Resource
    17O-NMR-Spektroskopie zur Lösung chemischer Probleme (1978)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 90 (1978), S. 258-271 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die NMR-Spektroskopie des Isotops 17O, eines Quadrupolkerns mit geringer natürlicher Häufigkeit, wurde bisher wegen experimenteller Schwierigkeiten nur beschränkt zur Lösung chemischer Probleme herangezogen. Ein Vergleich der aus systematischen Studien strukturell verwandter Verbindungen erhaltenen Daten zeigt jedoch, daß nichtäquivalente Sauerstoffatome für gewöhnlich große Unterschiede in den chemischen Verschiebungen aufweisen und daß für 17O in spezifischen chemischen Umgebungen charakteristische Werte der chemischen Verschiebung beobachtet werden. Die gegenwärtige Verfügbarkeit von 17O-angereichertem Material und von Fourier-Transform-NMR-Geräten läßt für die nahe Zukunft eine ausgiebige Anwendung der 17O-NMR-Technik zur Lösung struktureller Probleme erwarten.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19780900406
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  • 5
    Electronic Resource
    Electronic Resource
    Optisch aktives 2-Phenyl-3,4-dimethyl-morpholin (1956)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 68 (1956), S. 181-182 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19560680508
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  • 6
    Electronic Resource
    Electronic Resource
    New Directions in Polyvanadate Chemistry: From Cages and Clusters to Baskets, Belts, Bowls, and Barrels (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 31 (1992), S. 49-51 
    Details
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.199200491
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  • 7
    Electronic Resource
    Electronic Resource
    17O-NMR Spectroscopy as a Structural Probe (1978)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 17 (1978), S. 246-254 
    Details
    ISSN: 0570-0833
    Keywords: NMR spectroscopy ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 17O-NMR spectroscopy has found limited application as a structural probe due to the experimental problems associated with a quadrupolar nucleus having low natural abundance. A survey of data obtained from systematic studies of structurally related compounds shows, however, that large chemical shift differences are usually obtained for structurally nonequivalent nuclei, and that characteristic chemical shift values are observed for specific chemical environments. The present day availability of 17O enriched materials and Fourier transform NMR instrumentation should allow extensive application of the 17O-NMR technique to structural problems in the immediate future.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.197802461
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