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首页> 外文期刊>Journal of the Royal Society Interface >Extensive collection of femtolitre pad secretion droplets in the beetle Leptinotarsa decemlineata allows nanolitre microrheology
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Extensive collection of femtolitre pad secretion droplets in the beetle Leptinotarsa decemlineata allows nanolitre microrheology

机译：甲虫Leptinotarsa decemlineata中飞虫垫分泌物的大量收集允许纳升微流变学

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Pads of beetles are covered with long, deformable setae, each ending in a micrometric terminal plate coated with secretory fluid. It was recently shown that the layer of the pad secretion covering the terminal plates is responsible for the generation of strong attractive forces. However, less is known about the fluid itself because it is produced in an extremely small quantity. We present here the first experimental investigation of the rheological properties of the pad secretion in the Colorado potato beetle Leptinotarsa decemlineata (Coleoptera, Chrysomeli-dae). Because the secretion is produced in an extremely small amount at the level of the terminal plate, we first developed a procedure based on capillary effects to collect the secretion for rheological experiments. In order to study the collected fluid (less than 1 nl) through passive microrheology, we managed to incorporate micrometric probes (melamine beads) that were initially in the form of a dry powder. Finally, the bead thermal motions were observed optically and recorded to determine the mechanical properties of the surrounding medium. We achieved this quantitative measurement with the collected volume, which is much smaller than the usual 1 |xl sample volume required for this technique. Surprisingly, the beetle secretion was found to behave as a purely viscous liquid, of high viscosity (about 100 times that of water). This suggests that no specific complex fluid behaviour is needed by this adhesive system during beetle locomotion. We describe a scenario for the contact formation between the spatula at the setal tip and a smooth substrate, during the insect walk. We show that the attachment dynamics of the insect pad computed from the high measured viscosity is in good agreement with the observed insect pace. We finally discuss the consequences of the viscosity of the secretion on the insect adhesion.
机译：甲虫的垫子上覆盖着长而可变形的刚毛，每个都终止于涂有分泌液的测微端子板上。最近显示，覆盖分泌物的覆盖端子板的层负责产生强大的吸引力。但是，人们对流体本身知之甚少，因为它的产量非常小。我们在这里介绍科罗拉多马铃薯甲虫Leptinotarsa decemlineata（鞘翅目，Chrysomeli-dae）中垫分泌物的流变性质的首次实验研究。由于分泌物是在接线板水平上极少量产生的，因此我们首先开发了一种基于毛细作用的程序，以收集分泌物用于流变实验。为了通过被动微流变学研究收集的流体（少于1 nl），我们设法引入了最初以干粉形式存在的测微探针（三聚氰胺珠）。最后，光学观察磁珠的热运动并记录下来，以确定周围介质的机械性能。我们用收集的体积实现了这种定量测量，该体积比该技术所需的通常1 | xl样品体积小得多。出人意料的是，发现甲虫的分泌物表现为纯粘性液体，具有高粘度（约为水的100倍）。这表明在甲虫运动期间，该粘合剂系统不需要特定的复杂流体行为。我们描述了在昆虫走动过程中，刮刀在固定尖端的刮刀和光滑的基质之间形成接触的情况。我们表明，从高测得的粘度计算出的昆虫垫的附着动力学与观察到的昆虫步伐非常吻合。我们最后讨论分泌物粘度对昆虫粘附的影响。

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