Search results for "hybridation"
showing 10 items of 14 documents
Pseudomonas salomonii sp. nov., pathogenic on garlic, and Pseudomonas palleroniara sp. nov., isolated from rice
2002
International audience; A total of 26 strains, including 15 strains isolated from garlic plants with the typical symptoms of 'Café au lait' disease and 11 strains isolated from diseased or healthy rice seeds and sheaths infested by Pseudomonas fuscovaginae, were compared with 70 type or reference strains of oxidase-positive pathogenic or non-pathogenic fluorescent pseudomonads. The strains were characterized by using a polyphasic taxonomic approach. Numerical taxonomy of phenotypic characteristics showed that the garlic and rice strains were related to each other. However, they clustered into separate phenons, distinct from those of the other strains tested, and were different in several nu…
Autofiction oulipienne: l'écriture au miroir
2010
L’autofiction, genre hybride qui mêle autobiographie et fiction, semble devoir s’incarner de manière originale, innovante, dans la production oulipienne. Revisitée, l’autofiction oulipienne permet de redéfinir le rapport entre œuvre et écrivain. C’est le choix stylistique qui consent aux oulipiens de renouveler l’autobiographie par l’intervention d’une écriture en apparence exclusivement fictionnelle mais qui, au contraire, recèle et dissimule des indices autobiographiques à déchiffrer pour une complète compréhension du texte : ce sont les autobiographies « impures » de Perec et celles poétiques de Roubaud. Toutefois, l’autofiction innovante n’est pas celle qui évoque le passé mais celle qu…
Successive Invasion-Mediated Interspecific Hybridizations and Population Structure in the Endangered Cichlid Oreochromis mossambicus.
2013
Hybridization between invasive and native species accounts among the major and pernicious threats to biodiversity. The Mozambique tilapia Oreochromis mossambicus, a widely used freshwater aquaculture species, is especially imperiled by this phenomenon since it is recognized by the IUCN as an endangered taxon due to genetic admixture with O. niloticus an invasive congeneric species. The Lower Limpopo and the intermittent Changane River (Mozambique) drain large wetlands of potentially great importance for conservation of O. mossambicus, but their populations have remained unstudied until today. Therefore we aimed (1) to estimate the autochthonous diversity and population structure among genet…
Evaluation of a combined triple method to detect causative HPV in oral and oropharyngeal squamous cell carcinomas: p16 Immunohistochemistry, Consensu…
2012
Abstract Background Recent emerging evidences identify Human Papillomavirus (HPV) related Head and Neck squamous cell carcinomas (HN-SCCs) as a separate subgroup among Head and Neck Cancers with different epidemiology, histopathological characteristics, therapeutic response to chemo-radiation treatment and clinical outcome. However, there is not a worldwide consensus on the methods to be used in clinical practice. The endpoint of this study was to demonstrate the reliability of a triple method which combines evaluation of: 1. p16 protein expression by immunohistochemistry (p16-IHC); 2. HPV-DNA genotyping by consensus HPV-DNA PCR methods (Consensus PCR); and 3 viral integration into the host…
Biodiversity-functioning relations in microorganisms
2006
The role of microorganisms as key components in the functioning of ecosystems and biodiversity is discussed. The latest methodologies developed to study microbial diversity and functioning of ecosystems are considered, as DNA extraction and isotope labeling, fluorescent in situ hybridization and microautoradiography, and tracking of a substrate labeled with a stable isotope. Investigations related to correlations between microbial diversity and functioning in situ are considered. An example is illustrated of a correlation of erosion of microbial diversity of natural microbial community in prairie soil and erosion of species diversity in an ecosystem.
New hypothesis on the ploidy of the hybrid species Phytopthora alni subsp. alni
2012
EA MERS CT3 Affiche (+ résumé mais sans mention de C. Revellin sur le résumé (oubli de C. Husson)); Alder decline caused by the Phytophthora alni complex is one of the most important diseases in natural ecosystems in Europe in the last 20 years. The emergence of Phytophthora alni subsp. alni (Paa), the pathogen responsible for the epidemics, is linked to an interspecific hybridization event between two parental species: Phytophthora alni subsp. multiformis (Pam) and Phytophthora alni subsp. uniformis (Pau). One of these parental species, Pau that has been isolated in several European countries and in North America, specifically in Alaska and Oregon, is exotic to Europe and a diploid species…
Un point sur la zone de contact entre les deux contrefaisants Hippolais icterina et Hippolais polyglotta.
2008
Le cas du Grand contrefaisant (Hippolais icterina) et du Petit contrefaisant (Hippolais polyglotta) en sympatrie représente un contexte de zone d’hybridation « mobile » particulièrement intéressant d’un point de vue écologique et évolutif. Les travaux de Camille Ferry ont apporté une somme de connaissances importante sur le contexte écologique et comportemental de la vie en sympatrie pour ces deux espèces et initié plusieurs recherches dédiées en particulier aux conséquences morphologiques et vocales de la coexistence sympatrique des deux contrefaisants. Ces recherches montrent notamment des modifications morphologiques chez H. icterina dans le sens d’une plus grande ressemblance avec H. po…
Déterminisme du pouvoir protecteur de Fusarium oxysporum : recherche de gènes impliqués dans l'interaction protectrice avec la tomate
2007
Fusarium oxysporum is a common soil borne fungus, well represented in every type of soils, throughout the world. This species includes pathogenic strains inducing severe diseases in many crops and strains able to protect a plant against the infection by a pathogenic strain. The protective strains are not only non pathogenic strains isolated from suppressive soils but also pathogenic strains applied to a non host plant. The protective capacity of these strains is mainly based on mechanisms of competition and induced resistance of the plant The main objective of this work was to identify fungal genes involved in the protective capacity of these strains and associated to the elicitation of pla…
Etude et caractérisation de l'état " Viable mais Non Cultivable " chez Brettanomyces, une levure d'altération des vins : nouvel outil de détection et…
2011
The viable but not culturable (VBNC) state has been studied in detail in bacteria. It has been suggested that the VBNC state also exists in eukaryote cells, such as wine yeasts, including Brettanomyces in particular. We investigated the VBNC state in this yeast, focusing on the conditions for entry and exit, and the morphological and metabolic modifications associated with this state. We added sulfite (0.8 mg.L-1 molecular SO2) to induce the VBNC state. Increasing the pH of the medium inactivated the sulfite, allowing the cells to exit from the VBNC state and to become culturable again. In these conditions, we found that Brettanomyces VBNC cells were smaller than culturable cells, and that …