Draft genome sequence of Xanthomonas sacchari strain LMG 476

We report the high-quality draft genome sequence of Xanthomonas sacchari strain LMG 476, isolated from sugarcane. The genome comparison of this strain with a previously sequenced X. sacchari strain isolated from a distinct environmental source should provide further insights into the adaptation of this species to different habitats and its evolution. (Résumé d'auteur

Simultaneous observations of lower tropospheric continental aerosols with a ground-based, an airborne, and the spaceborne CALIOP lidar system

International audienceWe present an original experiment with multiple lidar systems operated simultaneously to study the capability of the Cloud-Aerosol LIdar with Orthogonal Polarization (CALIOP), on board the Cloud-Aerosol Lidar Pathfinder Satellite Observation (CALIPSO), to infer aerosol optical properties in the lower troposphere over a midlatitude continental site where the aerosol load is low to moderate. The experiment took place from 20 June to 10 July 2007 in southern France. The results are based on three case studies with measurements coincident to CALIOP observations: the first case study illustrates a large-scale pollution event with an aerosol optical thickness at 532 nm (τa532) of ∼0.25, and the two other case studies are devoted to background conditions due to aerosol scavenging by storms with τa532 <0.1. Our experimental approach involved ground-based and airborne lidar systems as well as Sun photometer measurements when the conditions of observation were favorable. Passive spaceborne instruments, namely the Spinning Enhanced Visible and Infrared Imager (SEVERI) and the Moderate-resolution Imaging Spectroradiometer (MODIS), are used to characterize the large-scale aerosol conditions. We show that complex topographical structures increase the complexity of the aerosol analysis in the planetary boundary layer by CALIOP when τa532 is lower than 0.1 because the number of available representative profiles is low to build a mean CALIOP profile with a good signal-to-noise ratio. In a comparison, the aerosol optical properties inferred from CALIOP and those deduced from the other active and passive remote sensing observations in the pollution plume are found to be in reasonable agreement. Level-2 aerosol products of CALIOP are consistent with our retrievals

Cu–Ga2_{2}O3_{3} nanoparticles supported on ordered mesoporous silica for the catalytic hydrogenation of cinnamaldehyde

Herein, we show that gallium oxide can function as an efficient promoter for the Cu-catalysed hydrogenation of cinnamaldehyde. SBA-15-supported Cu–Ga$_{2}$O$_{3}$ nanoparticles with a constant Cu loading of 5 wt% and two Cu/Ga weight ratios of 5 and 2, respectively, were synthesised by incipient wetness impregnation followed by mild drying. Physico-chemical characterisation revealed that the metal dispersion, and thus the active surface area of copper, can be enhanced nine-fold upon the addition of gallium promoter, boosting the catalytic activity as compared with the unpromoted Cu/SBA-15 catalyst. Likewise, the presence of Ga$_{2}$O$_{3}$ improved the selectivity to cinnamyl alcohol

Cu–Ga2_{2}O3_{3} nanoparticles supported on ordered mesoporous silica for the catalytic hydrogenation of cinnamaldehyde

Herein, we show that gallium oxide can function as an efficient promoter for the Cu-catalysed hydrogenation of cinnamaldehyde. SBA-15-supported Cu–Ga$_{2}$O$_{3}$ nanoparticles with a constant Cu loading of 5 wt% and two Cu/Ga weight ratios of 5 and 2, respectively, were synthesised by incipient wetness impregnation followed by mild drying. Physico-chemical characterisation revealed that the metal dispersion, and thus the active surface area of copper, can be enhanced nine-fold upon the addition of gallium promoter, boosting the catalytic activity as compared with the unpromoted Cu/SBA-15 catalyst. Likewise, the presence of Ga$_{2}$O$_{3}$ improved the selectivity to cinnamyl alcohol