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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 38 (1985), S. 215-220 
    ISSN: 1570-7458
    Keywords: Nemeritis canescens ; Hymenoptera ; Ichneumonidae ; Ephestia kuehniella ; Dufour's gland ; marker pheromone ; discrimination ; superparasitism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Des expériences sur le comportement de N. canescens ont montré que les sécrétions de la glande de Dufour sont utilisées comme phéromone de marquage pouvant affecter le comportement des autres hyménoptères face aux chenilles contaminées. Ce maqueur externe est produit à partir des sécrétions de la glande de Dufour, il a un effet dissuasif qui dure environ 32 heures après son émission. La séquence des actes comportementaux de Nemeritis montre un accroissement significatif de réactions de ‘fuite’ et d'‘évitement’ face à des chenilles d'Ephestia traitées superficiellement avec du contenu des glandes de Dufour. Cet article prouve pour la première fois que Nemeritis réagit aussi bien à des marqueurs externes qu'internes. Un comportement analogue vis à vis de papier filtre imprégné du contenu des glandes de Dufour et de son constituant hénéicosane constitue une preuve que le contenu de la glande influe sur le comportement de l'hymenoptère et ainsi lui évite de superparasiter ses hôtes.
    Notes: Abstract Behavioural experiments with Nemeritis canescens Grav. have demonstrated that the secretions from its Dufour's gland are used as a marker pheromone which can affect the behaviour of other wasps towards host caterpillars bearing it. The external marker is produced within the complex of secretions from the Dufour's gland and has oviposition deterrent effect which lasts approximately 32 h after deposition. The sequence of behaviour patterns shown by individual Nemeritis is described and shows a significant increase in ‘escape’ and ‘avoidance’ reactions towards Ephestia caterpillars treated topically with the Dufour's gland contents. This paper presents evidence for the first time to indicate that Nemeritis reacts to an external marker as well as to an internal one. Similar behaviour towards filter paper treated topically with contents of whole Dufour's gland and its component heneicosane contribute evidence for the conclusion that the gland contents influence the wasp's behaviour and hence its avoidance of superparasitism of its host.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-072X
    Keywords: Key words Soluble NAD-reducing hydrogenase ; Membrane-bound hydrogenase ; Diaphorase ; Rhodococcus opacus 1b ; Alcaligenes eutrophus H16
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Six new strains of Alcaligenes enriched for and isolated as nickel-resistant bacteria resemble Alcaligenes eutrophus H16 and contain both an NAD-reducing, tetrameric soluble hydrogenase and a membrane-bound hydrogenase. None of the soluble hydrogenases share with the Rhodococcus opacus MR11 enzyme tetramer the property of being cleaved easily into two dimeric moieties [a hydrogenase (βδ) and an NADH:acceptor oxidoreductase (αγ)], in the absence of nickel or at low ionic strength. The soluble hydrogenase of the newly isolated strain MR22 of R. opacus equalled that of strain MR11. The absence of a membrane-bound hydrogenase in Alcaligenes denitrificans strain 4a-2 and in Alcaligenes ruhlandii was confirmed.
    Type of Medium: Electronic Resource
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