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1995 (1)
1983 (1)
1Author    Konrad DettnerRequires cookie*
 Title    Vergleichende Untersuchungen zur Wehrchemie und Drüsenmorphologie abdominaler Abwehrdrüsen von Kurzflüglern aus dem Subtribus Philonthina (Coleoptera, Staphylinidae) Comparative Investigations on Defensive Chem istry and G land Morphology of Abdominal Defensive G lands from Rove Beetles of the Subtribe Philonthina (Coleoptera, Staphylinidae)  
 Abstract    Within the rove beetle subtribe Philonthina (Staphylinidae) there are found paired abdom inal defensive glands which show a bipartition and are characterized by an unique, evaginable evapo­ ration tissue which is described for the first time. The gland chemistry is found to be character­ ized by at least 27 compounds. The m ain com ponent is represented by the alkaloid actinidine, m i­ nor components are iridodial, three possible m onoterpenoid iridodial precursors, an octadecenole and two series o f hydrocarbons and acetates which are partly branched and unsaturated. It could be shown, that the separated gland o f the evaporation tissue, whose evagination was studied, has no different synthetic abilities as com pared with the main gland system. Chemotaxonomic results according to Hennig's principle reveal an isolated position of the rove beetle tribe Q uediini within the subfamilies X antholininae and Staphylininae. The morphologically unique defensive gland of the X antholininae may be homologized with other abdom inal glands o f the Staphylinina and Philonthina, based on the comm on presence of iridoid defensive components. 
  Reference    Z. Naturforsch. 38c, 319 (1983); received July 27 1982 
  Published    1983 
  Keywords    Chemical Defence, Glands, Chemotaxonomy, Staphylinidae, Coleoptera 
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 TEI-XML for    default:Reihe_C/38/ZNC-1983-38c-0319.pdf 
 Identifier    ZNC-1983-38c-0319 
 Volume    38 
2Author    A.Ndreas Detzel, Michael WinkRequires cookie*
 Title    Evidence for a Cardenolide Carrier in Oncopeltus fasciatus (Dallas) (Insecta: Hemiptera)  
 Abstract    O ncopeltus fasciatus (H emiptera) is morphologically and physiologically adapted to seques­ ter cardiac glycosides for its chemical defence against predators. A s a prerequisite for carde­ nolide utilization this bug has to take up and store the dietary cardenolides. Using isolated midguts it could be shown experimentally that the resorption of [3H]digoxin is time-, and temperature-dependent. The hydrogen ion concentration for uptake is optimal between pH 5.5 and 7 and an activation energy of 45 to 49 kJ/mol can be derived from an Arrhenius plot. U ptake can be inhibited competitively by the polar cardiac glycoside convallatoxin. Sulf-hydryl group reagents (N-ethylmaleimide), membrane destabilizing compounds and respira­ tory chain inhibitors reduce digoxin resorption, as do inhibitors of sugar transport (e.g., phlo-ridzin). The experimental data thus provide evidence for a cardenolide carrier in midgut cells o f O. fasciatus. 
  Reference    Z. Naturforsch. 50c, 127—134 (1995); received October 10/November 18 1994 
  Published    1995 
  Keywords    O ncopeltus fasciatus, Chemical Defence, Cardenolide Sequestration, Carrier-Mediated Uptake, Cardenolide Carrier 
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 TEI-XML for    default:Reihe_C/50/ZNC-1995-50c-0127.pdf 
 Identifier    ZNC-1995-50c-0127 
 Volume    50