1,720,969 research outputs found
First Quantification of Courtship Behavior in a Silver Fly, Leucopis palumbii (Diptera: Chamaemyiidae): Role of Visual, Olfactory and Tactile Cues
No full textMale Wing Fanning Performance During Successful and Unsuccessful Mating in the Parasitic Wasp Lariophagus distinguendus Förster (Hymenoptera: Pteromalidae)
No full textCourtship and mating behaviour in the fruit fly parasitoid Psyttalia concolor (Szépligeti) (Hymenoptera: Braconidae): the role of wing fanning.
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The green leafhopper, cicadella viridis (hemiptera, auchenorrhyncha, cicadellidae), jumps with near-constant acceleration
No full textJumping insects develop accelerations that can greatly exceed gravitational acceleration. Although several species have been analysed using different tools, ranging from a purely physical to a morpho-physiological approach, instantaneous dynamic and kinematic data concerning the jumping motion are lacking. This is mainly due to the difficulty in observing in detail events that occur in a few milliseconds. In this study, the behaviour of the green leafhopper, Cicadella viridis, was investigated during the take-off phase of the jump, through high-speed video recordings (8000 frames s-1). We demonstrate that C. viridis is able to maintain fairly constant acceleration during overall leg elongation. The force exerted at the foot-ground interface is nearly constant and differs from the force expected from other typical motion models. A biomechanical model was used to highlight that this ability relies on the morphology of C. viridis hind legs, which act as a motion converter with a variable transmission ratio and use the time-dependent musculo-elastic force to generate a nearly constant thrust at the body-ground interface. This modulation mechanism minimizes the risk of breaking the substrate thanks to the absence of force peaks. The results of this study are of broad relevance in different research fields ranging from biomechanics to robotics. © 2013. Published by The Company of Biologists Ltd
Jumping like an insect: Design and dynamic optimization of a jumping mini robot based on bio-mimetic inspiration
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
The production of female sex pheromone in Bactrocera oleae (Rossi) young males does not influence their mating chances
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