Search results for "Piégeage"
showing 4 items of 4 documents
Olfactory attraction of the hornet Vespa velutina to honeybee colony odors and pheromones.
2014
19 pages; International audience; Since the beginning of the last century, the number of biological invasions has continuously increased worldwide. Due to their environmental and economical consequences, invasive species are now a major concern. Social wasps are particularly efficient invaders because of their distinctive biology and behavior. Among them, the yellow-legged hornet, Vespa velutina, is a keen hunter of domestic honeybees. Its recent introduction to Europe may induce important beekeeping, pollination, and biodiversity problems. Hornets use olfactory cues for the long-range detection of food sources, in this case the location of honeybee colonies, but the exact nature of these c…
Impact of konjac glucomannan on interactions aroma compound - potato starch in a hydrated gel
2016
The objective of this study is to demonstrate that the presence of konjac glucomannan (KGM) in a potato starch matrix enhances its physical stability without inhibiting the molecular encapsulation of aroma compounds by amylose. For that purpose, the two selected polysaccharides are from plant tubers, abundant in nature.Starch is known to interact with volatile compounds either by trapping in amorphous phase or by forming inclusion complexes. This phenomenon is called molecular encapsulation. However, at high water content, these starchy matrices exhibit syneresis that can be harmful to the stability of the aroma compounds trapping over time. KGM has the ability to form highly viscous soluti…
On chip optical nanotweezing for dielectric particles manipulation
2014
On chips optical nanocavities have become useful tools for trapping and manipulation of colloidal objects. In this thesis we study the nanocavities as building blocks for optical forces, trapping and handling of particles. Proof of concept of trapping dielectric microspheres appears as the starting point of the development of lab on chip. In the first chapter we go through the literature of optical forces in free space and integrated optics. The second chapter presents the experimental tools for the characterization of nanocavities and the set-up developed to perform optical measurements with the colloidal particles. The third chapter describes the proof-of-concept trapping of polystyrene p…
THE RED PALM WEEVIL IN SICILY: THE INTRODUCTION AND SPREAD OF AN INVASIVE ALIEN SPECIES
2013
The red palm weevil (RPW), Rhynchophorus ferrugineus Olivier (Coleoptera: Curculionidae), is a pest from Southeast Asia accidentally introduced into North Africa and Europe two decades ago. In Sicily, RPW was recorded for the first time in 2005, then, in few years, it established becoming the most severe pest of ornamental palm species in urban, monumental and country areas. In this paper, we first report the history of its introduction and spread. Then, we reviewed the preventative and curative strategies that have been implemented with variable degrees of success in containing the invasive alien pest. Finally, we focus on the development of new strategies to detect early infestations and …