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  4. Struktur und Funktion des tarsalen Haftsystems der Madagaskar-Fauchschabe Grompadorhina portentosa (Blattodea)
 
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2018
Journal Article
Title

Struktur und Funktion des tarsalen Haftsystems der Madagaskar-Fauchschabe Grompadorhina portentosa (Blattodea)

Abstract
The tarsal attachment system of the Madagascar Hissing cockroach Grompadorhinaportentosa (Blattodea, Blaberidae) was analysed with respect to the ultrastructure of its smooth adhesive pads (arolium, euplantula), the chemical composition of its adhesive secretion, and its adhesion and friction performance on surfaces of different roughnesses. Local measurements performed with a nanotribometer showed that, in the non-manipulated euplantulae, friction was clearly increased in the push direction, whereas the arolium of the fore tarsus showed higher friction in the pull direction. The surface of the euplantulae shows an imbricate appearance, whereby the ledges face distally, which might contribute to the observed frictional anisotropyin push direction. The glandular epithelium of both the arolium and the euplantulum releases adhesive secretions into a subcuticular void from which it has to permeate the thick cuticle of the adhesive pads. In the euplantulae, adhesion was one to two orders of magnitude lower than friction. Whereas adhesive tenacity was slightly decreased with depleted secretion, it was considerably increased after artificial application of oily liquids. Our chemical analyses of the secretion suggest a semisolid consistency of the adhesive secretion, which probably facilitates the detachment of the tarsus during locomotion. On nanorough surfaces, the insect appears to benefit from employing emulsions instead of pure oils to avoid excessive friction. Based on our chemical analyses, 12 synthetic heterogeneous adhesive emulsions were prepared. By varying their chemical composition, they could be adjusted to have diverse consistencies. Some of them were able to mimic certain rheological and tribological properties of natural tarsal insect adhesives.
Author(s)
Betz, Oliver
Universität Tübingen, Institut für Evolution und Ökologie
Albert, Klaus
Universität Tübingen, Institut für Organische Chemie
Boley, Moritz
Universität Tübingen, Institut für Evolution und Ökologie
Frenzel, Melina
Universität Tübingen, Institut für Evolution und Ökologie
Gerhard, Heike
Universität Tübingen, Institut für Pharmazeutische Chemie
Grunwald, Ingo
Fraunhofer-Institut für Fertigungstechnik und Angewandte Materialforschung IFAM  
Hartwig, Andreas  
Fraunhofer-Institut für Fertigungstechnik und Angewandte Materialforschung IFAM  
Kleemeier, Malte  
Fraunhofer-Institut für Fertigungstechnik und Angewandte Materialforschung IFAM  
Maurer, Andreas
Universität Tübingen, Medizinisch-Naturwissenschaftliches Forschungszentrum
Neuenfeldt, Martin
Universität Tübingen, Institut für Evolution und Ökologie
Rischka, Klaus  
Fraunhofer-Institut für Fertigungstechnik und Angewandte Materialforschung IFAM  
Sampalla, Benjamin
Universität Tübingen, Institut für Evolution und Ökologie
Schmitt, Christian
Universität Tübingen, Institut für Evolution und Ökologie
Speidel, Matthias
Universität Tübingen, Institut für Evolution und Ökologie
Steiner, Michael
Universität Tübingen, Institut für Evolution und Ökologie
Verheyden, Nikita
Universität Tübingen, Institut für Evolution und Ökologie
Vogt, Martin
Universität Tübingen, Institut für Evolution und Ökologie
Journal
Mitteilungen der Deutschen Gesellschaft für Allgemeine und Angewandte Entomologie  
Language
German
Fraunhofer-Institut für Fertigungstechnik und Angewandte Materialforschung IFAM  
Keyword(s)
  • adhesion

  • attachment

  • Blattodea

  • functional morphology

  • locomotion

  • tarsus

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