Deliverable D2.4: Publication Of Results On Bug Cuticles

Johannes Heitz
2017 Zenodo  
The goal of D2.4 was to publically present the results of Task 2.2 (Characterisation bug cuticle) and Task 2.3 (Polymer replica of bug cuticle) in form of an article in a peer-reviewed scientific journal about the findings on the function of micro- and nanostructures of the bark bug cuticle for fluid transport using the Open Access model. Deliverable D2.4 is based on deliverable D2.3 and partially on D2.2. We found that flat bark bugs Dysodius lunatus possess caudally oriented
more » ... underneath the wings, around the glands that secrete an oily defensive liquid, as an antipredator adaptation. Even though the gland system is located on the dorsal surface, the substance is most likely evaporated at the region of wings' base. We suppose that specifically these microstructures contribute to the transport of the oily substance from the gland system to the wings of the bug. The micro-ornamentation consists of a periodical array of droplet looking like structures of around 10 μm in length, with an undercut. Along the scent gland channel, the microstructures show some variation. But in all cases, the microstructures have pointed tips which are oriented caudally, i.e. opposite to the bug head. The density and size of the structures are similar over the whole channel length. The wings of Dysodius lunatus are kept mostly in the folded state. The bug cuticle containing the droplike structures and the wing together form therefore a closed capillary channel, and the oil transport occurs in the direction from the point ends towards the wider ends of these microstructures. In our work study, we were using the micro-ornamentation found around the oil secreting scent glands underneath the wings of Dysodius lunatus as a model for surface patterning to assess the oil behavior in contact with the drop-like microstructure arrays. In order to produce these bio-inspired microstructures at real scale, the two-photon polymerization technique was used. A good directionality of oil transport was achieved, directly contro [...]
doi:10.5281/zenodo.1292962 fatcat:tgmm74dunzervh6rxip7b4bptu