Une des pistes de recherche les plus récentes concernant la gestion des espèces végétales invasives porte sur les capacités des plantes à produire des composés chimiques inhibant la croissance ou le développement d'autres végétaux. Cet article décrit les enjeux, quelques recherches menées en France et les défis posés par cette démarche.
Strategies for measuring occupational exposure to aerosols composed of nanoparticles and/or ultrafine particles highlight the use of techniques for determining airborne-particle number concentration as well as number size distribution. The objective of the present work was to set up a system for conducting laboratory verification campaigns of conde...
The aim of this experimental study was to investigate the performance of both portable and transportable devices devoted to the real-time measurement of airborne particle number concentration and size (distribution). Electrical mobility spectrometers (SMPS, FMPS, Nanoscan) as well as diffusion chargers (DiSCmini, Nanotracer) were studied. Both mono...
The handling of carbon nanotube (CNT) powders is a plausible scenario during the course of the CNT life-cycle. However, related exposure data remain limited. In this context, information about the dustiness of CNT is therefore of great interest, for example for control banding or exposure modelling. Here, we investigate the dustiness of fourteen CN...
Les stratégies de mesure des expositions professionnelles aux aérosols de nanomatériaux mettent en avant l’utilisation de techniques de mesure de la concentration en nombre de particules ainsi que leur distribution granulométrique. L’objectif de ces travaux était de mettre en place un système de référence permettant de mener en laboratoire des camp...
Des poussières de route ont été échantillonnées sur différentes positions le long d'un double chemin de fer à deux voies près de Paris (France). Les échantillons ont été analysés pour la distribution de la taille des particules et les concentrations de polluants (métaux lourds et HAP). La distribution de la taille des particules dépend de l'emplace...
Seven 2,5-diketopiperazines (DKPs) were isolated from the Fijian marine sponge Acanthella cavernosa. NMR and circular dichroism (CD) comparison with synthetic L-L DKPs allowed us to determine unambiguously the L-L absolute configuration of the natural DKPs. This work initiated the setting up of an optical properties database of natural DKPs, includ...
Seven 2,5-diketopiperazines (DKPs) were isolated from the Fijian marine sponge Acanthella cavernosa. NMR and circular dichroism (CD) comparison with synthetic L-L DKPs allowed us to determine unambiguously the L-L absolute configuration of the natural DKPs. This work initiated the setting up of an optical properties database of natural DKPs, includ...
During a flood event over a karst watershed, the connections between surface and ground waters appear to be complex ones. The karst may attenuate surface floods by absorbing water or contribute to the surface flood by direct contribution of karst waters in the rivers (perennial and overflowing springs) and by diffuse resurgence along the hillslopes...
