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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Insectes sociaux 37 (1990), S. 58-72 
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Resume L'exécution de deux tâches, butinage et production de cire, a été comparée pour des colonies d'abeilles mellifères issues d'essaims principaux et d'essaims secondaires. Dans les colonies d'essaims secondaires, les ouvrières ont tendance à commencer le butinage à des âges plus avancés. Ce delai est généralement accompagné d'une plus longue production de cire. Les différences dans l'exécution des tâches des deux sortes d'essaims démontrent l'incorporation d'un système flexible de castes temporelles dans la vie d'une colonie. Aucune relation n'a pu être observée entre le nombre d'abeilles dans les essaims et les âges auxquels les tâches furent exécutées. Il est donc suggeré que les interruptions d'élevage du couvain et des changements dans la distribution des âges vers des ouvrières plus âgées furent responsables des délais de l'ontogenèse des castes temporelles de colonies originaires d'essaims secondaires.
    Notes: Summary The performance of two tasks, wax production and foraging, was compared between colonies founded by prime swarms and afterswarms of honey bees. Workers began foraging at older ages in afterswarms and this delay was generally coupled with a longer duration of wax production. Differences in task performance between swarm types demonstrate the integration of a flexible behavioral caste system into life history. No relationships were found between swarm population size and ages of task performance, suggesting that breaks in brood rearing and upward shifts in worker age distribution were responsible for delays in the ontogeny of temporal castes in afterswarm-founded colonies.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Resume Nous avons examiné l'attractivité d'un nouveau mélange synthétique fait à partir de cinq composés phéromonaux de la glande mandibulaire chez la reine d'abeille domestique sur l'attraction d'ouvrières durant l'essaimage ainsi que l'inhibition de la production des cellules royales. Le mélange est constitué de trois acides: 9-kéto-2 (E)-acide décénoiques (9ODA), etR-(−)- etS-(+)-9 hydroxy-2 (E)-acide décénoique (9HDA), et des deux aromatiques:p-hydroxyzenzoate méthyle (HOB) et 4-hydroxy-3-méthoxyphényléthanol (HVA). Il est significativement plus actif que ne le sont les composés unitaires pris séparément ou en combinaisons de moins de cinq dans la formation de la suite royale (Slessor et al., 1988). Nos expériences ont inclus les traitements suivants: reines vivantes, extraits de glande mandibulaire, combinaison des trois acides décénoiques et des acides décénoiques avec les aromatiques HOB et HVA. Tandis que les phéromones de la glande mandibulaire attiraient les ouvrières durant l'essaimage et inhibaient la production des cellules royales, la reine était toujours la plus active. Cependant, l'effet du mélange des cinq composés a toujours été comparable ou supérieur à celui de l'extrait mandibulaire, suggérant que des phéromones non-mandibulaires additionnelles peuvent aussi être impliquées dans ces fonctions. La combinaison des deux aromatiques, HOB et HVA, avec les trois acides décénoiques, 9ODA,R-(−)-9HDA, etS-(+)-9HDA, a engendré une activité plus forte que les acides décénoiques seuls. L'élévation d'activité du mélange complet de cinq composés a produit des effets allant d'une faible augmentation qualitative de la formation du groupe à une élévation quantitative modérée de l'inhibition de la production des cellules royales et jusqu'à une forte augmentation quantitative de la formation de la suite royale.
    Notes: Summary In this study, we examined the role of a new, five-component synthetic blend of queen bee mandibular gland pheromone in the attraction of worker bees to artificial swarm clusters, as well as the inhibition of queen rearing. This blend, which consists of three acids: 9-keto-2 (E)-decenoic acid (9ODA), andR-(−)- andS-(+)-9-hydroxy-2 (E)-decenoic acid (9HDA), and two aromatics: methylp-hydroxybenzoate (HOB) and 4-hydroxy-3-methoxyphenylethanol (HVA), has recently been shown to be significantly more active than any of its individual components, alone or in combinations of less than five components, in retinue formation around the queen (Slessor et al., 1988). In the current research, treatments included live queens, mandibular gland extracts, the three decenoic acids together, and the decenoic acids plus the aromatics HOB and HVA. While mandibular gland pheromones attracted workers during swarming and inhibited queen rearing, the queen always showed the strongest activity. However, the five-component blend was always equal to or better than the mandibular extract, suggesting that additional, non-mandibular pheromones may also be involved in these functions. The combination of the two aromatics, HOB and HVA, with the three decenoic acids, 9ODA,R-(−)-9HDA, andS-(+)-9HDA, showed stronger activity than the decenoic acids alone. The enhanced activity of the full, five-component blend exhibited a range of effects from a slight, qualitative enhancement of cluster formation to a moderate, quantitative enhancement of queen rearing inhibition, to a strong, highly significant enhancement of retinue formation.
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  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Molecular Structure 84 (1982), S. 293-302 
    ISSN: 0022-2860
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 45 (1958), S. 395-396 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 66 (1979), S. 264-265 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical and applied genetics 35 (1965), S. 374-376 
    ISSN: 1432-2242
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical and applied genetics 35 (1965), S. 336-336 
    ISSN: 1432-2242
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-2242
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Shock waves 1 (1991), S. 223-232 
    ISSN: 1432-2153
    Keywords: Force measurement ; Acceleration measurement ; Short-duration flow ; Shock tunnel
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics , Technology
    Notes: Abstract For aerodynamic force measurement in shock tunnels and similar short duration aerodynamic testing facilities we have developed a novel measurement technique. Its key feature is a mounting support, which releases the test model and grips it again after a free flight duration of about 10 milliseconds. The model is equipped with small accelerometers and may contain additional installations. The short free flight allows the use of thin wires because the model travels only a few millimeters during this time. Validation experiments with a cone-cylinder of known drag coefficient show good accuracy with a response time of about half a millisecond. Pitot pressure measurement and suitable data processing allow for direct evaluation of aerodynamic coefficients in slowly changing flow.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 97 (1934), S. 81-86 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Zusammenfassung Versuche, das lichtelektrische Colorimeter von B. Lange in der Wasseruntersuchung zu verwenden, ergaben, daß sich einige colorimetrische und nephelometrische Prüfungen auf diese Weise ausführen lassen. Das wird an den Beispielen des Eisens, Mangans, des Phenols, der Sulfate und des Bleis gezeigt. Besonders für Reihenuntersuchungen erwies sich das Gerät als praktisch. Als geeignet erwiesen sich die Ausschlags- und Substitutionsmethode. Die erzielte Genauigkeit und Empfindlichkeit entspricht den üblichen Anforderungen. Eine wünschenswerte Steigerung der Empfindlichkeit und eine Erweiterung der Anwendungsmöglichkeit des Geräts wird sich durch einige vorgeschlagene Verbesserungen, hauptsächlich durch Erhöhung der Schichtdicke der Untersuchungslösung, erreichen lassen.
    Type of Medium: Electronic Resource
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