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Horizontal gene transfer (HGT) is recognized as the major force for bacterial genome evolution. Yet, numerous questions remain about the transferred genes, their function, quantity and frequency. The extent to which genetic transformation by exogenous DNA has occurred over evolutionary time was initially addressed by an in silico approach using the complete(More)
In tropical ecosystems, termite mound soils constitute an important soil compartment covering around 10% of African soils. Previous studies have shown (S. Fall, S. Nazaret, J. L. Chotte, and A. Brauman, Microb. Ecol. 28:191-199, 2004) that the bacterial genetic structure of the mounds of soil-feeding termites (Cubitermes niokoloensis) is different from that(More)
The plant pathogenic Betaproteobacterium Ralstonia solanacearum is a complex species in that most of the strains share the common characteristic of being naturally transformable. In this study, we used a new approach based on comparative genomic hybridization (CGH) on microarrays to investigate the extent of horizontal gene transfers (HGTs) between(More)
The comparative impact of the two most representative species of termites (Cubitermes niokoloensis and Macrotermes bellicosus) on the monosaccharide (glucose, galactose, mannose, rhamnose, arabinose, and xylose) content of soil from a semi-arid tropical savanna (Senegal) was investigated. Two complementary procedures for soil fractionation (particle-size(More)
This study aimed to test the effect of Eucalyptus litter on growth, roots symbioses status and nutrition of Sahelian acacia’s seedlings. Sangalkam sandy soil was amended with two levels (1 and 5 %) of Eucalyptus litter. As control of the effect of litter addition, sandy soil was amended with 1 and 5 % of maize litter. In addition, a control without(More)
Microbial biogeography is the study of the distribution of microbial diversity on large scales of space and time. This science aims at understanding biodiversity regulation and its link with ecosystem biological functioning, goods and services such as maintenance of productivity, of soil and atmospheric quality, and of soil health. Although the initial(More)
Ralstonia solanacearum is a widely distributed phytopathogenic bacterium that is known to invade more than 200 host species, mainly in tropical areas. Reference strain GMI1000 is naturally transformable at in vitro and also in planta conditions and thus has the ability to acquire free exogenous DNA. We tested the ubiquity and variability of natural(More)
Studies were undertaken to characterize and determine the pathogenic mechanisms involved in a newly described systemic disease in Homarus americanus (American lobster) caused by a Vibrio fluvialis-like microorganism. Nineteen isolates were obtained from eight of nine lobsters sampled. Biochemically, the isolates resembled V. fluvialis, and the isolates grew(More)
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