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  • 1
    Electronic Resource
    Electronic Resource
    Ontogenetic patterns of volatiles identified in Dufour's gland extracts from queens and workers of the primitively eusocial halictine bee,Lasioglossum malachmum (Hymenoptera: Halictidae) (1993)
    Springer
    Insectes sociaux 40 (1993), S. 41-58 
    Details
    ISSN: 1420-9098
    Keywords: Lasioglossum malachurum ; sweat bee ; Dufour's gland volatiles ; ontogenetic patterns of odorous compounds ; pheromones ; mating
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Ontogenetic patterns of volatile compounds identified in Dufour's gland extracts from queens and workers of the primitively eusocial sweat beeLasioglossum malachurum (K.) were compared. Only young unmated queens showed high proportions of isopentenyl esters, while macrocyclic lactones were dominant in old breeding queens, spring queens, and workers. In young queens the relative and absolute amounts of volatiles changed one day after mating. A discriminant analysis revealed significant differences in odor patterns of unmated and mated young queens. The fat body was the largest in young females, while eggs could be recorded only in breeding queens. Possible functions of different odor components in the investigated female groups are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01338831
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Host-parasite relationships in six species ofSphecodes bees and their halictid hosts: Nest intrusion, intranidal behavior, and Dufour's gland volatiles (Hymenoptera: Halictidae) (1994)
    Springer
    Journal of insect behavior 7 (1994), S. 101-117 
    Details
    ISSN: 1572-8889
    Keywords: kleptoparasitism ; intranidal behavior ; invasion behavior ; Dufour's gland secretions ; Halictidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Nest invasion behavior was studied in six kleptoparasiticSphecodes species at four nesting sites of their respective social and solitary hosts.Sphecodes females preferred to enter unguarded nests. Nest intruding strategies observed in the differentSphecodes species did not depend on whether host species were solitary or social, as long as the nesting cycle of a social host was in the solitary stage (i.e., a single host female). Observation of intranidal behavior revealed thatSphecodes monilicornis females kill all host individuals within an usurped nest. They stay in the nest for several hours, laying eggs in adequately provisioned brood cells. Gas chromatography-mass spectrometry analyses of Dufour's gland secretions revealed species-specific compositions. Qualitative comparisons of whole patterns and quantitative comparisons considering the predominant hydrocarbons common to both host and parasite contradict the hypothesis of chemical mimetism, a mechanism supposed to permit parasite intrusion by qualitatively similar odor bouquets in host and parasite females.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01989830
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Dose-dependent inhibition of emergency queen rearing by synthetic 9-ODA in the honey bee, Apis mellifera carnica (1993)
    Springer
    Journal of comparative physiology 163 (1993), S. 363-366 
    Details
    ISSN: 1432-136X
    Keywords: Emergency queen rearing ; Releaser pheromone ; (E)-9-oxo-2-decenoic acid ; Dose-dependent 9-ODA effect ; Honey bee, Apis mellifera
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract In the honey bee colony queen rearing is usually suppressed by releaser effects of the queen's pheromone. This is part of the dominance hierarchy maintaining the monogynous homeostasis. Under queenless conditions, the queen's control over the construction of emergency queen cells by the workers can be substitued by exposure to only one component of the mandibular pheromone secretion of a queen, the main compound (E)-9-oxo-2-decenoic acid. A novel and simple synthesis of (E)-9-oxo-2-decenoic acid is described, and a bioassay was developed by which a dose-dependent effect of synthetic (E)-9-oxo-2-decenoic acid presented on a dummy bee was evaluated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00265639
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  • 4
    Electronic Resource
    Electronic Resource
    Anticholinerges Syndrom nach Ingestion von Tee aus Engelstrompetenblüten (2000)
    Springer
    Monatsschrift Kinderheilkunde 148 (2000), S. 18-22 
    Details
    ISSN: 1433-0474
    Keywords: Schlüsselwörter ; Zentrales anticholinerges Syndrom ; Engelstrompete ; Datura suaveolens ; Skopolaminvergiftung ; Alkaloidintoxikation ; Key words ; Central anticholinergic syndrome ; Angel’s trumpet ; Datura suaveolens ; Scopolamine-poisoning ; Alkaloid-intoxication
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Reports of accidental alkaloid-intoxications with plants of the nightshade family, in particular Datura-species are well known in pediatric care. The intentional abuse as a hallucinogenic drug in adolescents became more frequent in recent years. Two patients, a 14- resp. 16-year old boy were admitted to the intensive care units of our hospitals because of a severe central anticholinergic syndrome after ingestion of tea from Angel’s Trumpet blossoms for experimental reasons. Patient’s history in the first somnolent patient was not available at the time of admission, a routine immunological drug screening of the patient’s urine had been negative. Discussion: Prominent central nervous symptoms as unconsciousness or hallucinations in adolescents without further explanation should suggest a special toxicological analysis for tropan-alcaloids e.g. scopolamine because of increasing abuse of plants containing the drug.
    Notes: Zusammenfassung Akzidentelle Intoxikationen von Nachtschattengewächsen bei Kindern sind bereits häufiger beschrieben worden. In jüngster Zeit nimmt der bewußte Mißbrauch insbesondere von Daturaarten als Rauschmittel bei Heranwachsenden deutlich zu. Wir berichten über 2 14 bzw. 16jährige Jugendliche, die aus Experimentierfreudigkeit einen Tee aus Engelstrompetenblüten getrunken hatten und sich wegen eines ausgeprägten zentralen anticholinergen Syndroms auf unseren Intensivstationen behandeln lassen mußten. Im ersten Fall, einem somnolenten Patienten, war zunächst keine Anamnese verfügbar, ein immunologisches Drogen-Screening im Urin blieb ohne richtungsweisendes Ergebnis. Diskussion: Auch bei im Vordergrund stehender Bewußtseinstrübung oder paranoid-halluzinatorischen Symptomen sollte insbesondere bei Jugendlichen an eine Ingestion von Tropanalkaloiden bzw. eine Skopolaminintoxikation durch Ziergewächse wie Engelstrompete oder Stechapfel gedacht und gezielt danach gesucht werden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001120050004
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    Paper (German National Licenses)
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