Solomon Samba

L'invention concerne un systeme de communication de donnees qui facilite l'integration de dispositifs de communication avec ou sans fil dans des reseaux de fournisseurs de services et centraux. Ce systeme de communication de donnees comprend un sous-reseau qui assure un transport de donnees ameliore et des services IP geres pour des fournisseurs de services. Des serveurs IP geres traitent des donnees au niveau de la couche IP et effectuent des fonctions de cryptage, decryptage, compression et decompression, ce qui permet de fournir des services bases sur le contenu a des utilisateurs finaux.

The preparation of three new examples of water insoluble host/guest assemblies of the general composition:[(R4N)(Me3Sn) 2M (CN) 6· zH2O](R= n-propyl or n-pentyl, M= Fe or Co, 0≤ z≤ 2) from likewise polymeric super-Prussian-blue derivatives [(Me3Sn) 3M (CN) ...

... d Institut Sénégalais de Recherches Agricoles (ISRA)/ CERAAS, BP 3320 Thiès Escale, Thiès, Senegal. e University of California, Department of Land, Air and Water Resources, 106 Veihmeyer Hall, Davis, CA 95616, USA. f USAID/Sénégal, Dakar, Senegal. ...

... of C stocks for different land management systems allows for better estimates of these ... Besides the global goal of mitigating elevated atmospheric carbon dioxide, sequestering C in soils ... These benefits could include increased land productivity, better yields and also contribute to ...

The São Tomé Grosbeak Neospiza concolor is critically endangered, with an area of occurrence smaller than 16 km2 and an adult population under 50 individuals. It was previously thought to be restricted to old-growth forest in the southern lowlands of the island, but here we describe its presence at altitude over a long period, using young secondary forests and feeding on plants characteristic of disturbed areas. By extending the grosbeak's area of occurrence and what is known about its ecology, these observations raise new hope for the survival of this threatened bird. However, this new site lies outside the Ôbo Natural Park, São Tomé's only protected area, for which we alert the need to better protect its surroundings, which are relevant for many of the island's endemic species.

ABSTRACT The indigenous shrub, Guiera senegalensis, coexists with crops to varying degrees in farmers' fields throughout the Sahel, with little known about its biophysical and ecological interactions with soils and crops. Therefore, the objectives were to determine the effect of the presence or absence of shrubs under varying rates of fertilizer on: (i) crop growth and yield, and (ii) soil nutrient dynamics. An experiment from 2004 to 2007 was conducted in northern Senegal where G. senegalensis dominates that had a split-plot factorial design. The presence or absence of G. senegalensis was the main plot and fertilizer rate (0, 0.5, 1 or 1.5 times the recommended N-P-K rate) was the subplot in a peanut (Arachis hypogaea L.)-pearl millet [Pennisetum glaucum (L.) R. Br.] rotation. Averaging over fertilizer rate showed that G. senegalensis had significantly greater crop biomass and yields than no shrub plots (P < 0.05) for all 4 yr. This crop yield response was related to improved nutrient availability (significantly greater for crop N and P uptake in the presence than absence of shrubs in zero fertilizer plots), higher soil quality (elevated particulate organic matter (POM) with shrubs, and a significant correlation of POM with millet yield). Lysimeters below the crop rooting zone had inorganic N levels that were not significantly affected by shrubs compared to no shrub plots, which was attributed to high variability. Combining the ecological potential to restore degraded landscapes with the agronomic benefits demonstrated here, shows that optimized G. senegalensis-crop systems should be further investigated in farmers' fields throughout the Sahel.