Search results for "Bion"
showing 10 items of 130 documents
Biotechnological applications of the sepiolite interactions with bacteria: Bacterial transformation and DNA extraction
2020
International audience; Among the various clay minerals, sepiolite, which is a natural nanofibrous silicate that exhibit a poor cell toxicity, is a potential promising nanocarrier for the non-viral and stable transfer of plasmid DNA into bacteria, mammalian and human cells. We first show here that sepiolite binds to bacteria, which can be useful in decontamination protocols. In a previous research we have shown that is possible to modulate the efficiency of the absorption of different types of DNA molecules onto sepiolite, and that the DNA previously adsorbed could be recovered preserving the DNA structure and biological activity. Taking advantage of both, the sepiolite/bacteria and sepioli…
Compréhension et valorisation des interactions entre plantes et microorganismes telluriques : un enjeu majeur en agroécologie
2015
National audience; La libération d’une part significative des produits de photosynthèse de la plante sous forme de rhizodépôts constitue une source majeure de composés organiques pour la microflore hétérotrophe du sol qui est principalement en état de stase du fait de la forte compétition nutritionnelle régnant au niveau du sol. Parmi l’immense biodiversité tellurique, la plante sélectionne des populations particulières bien adaptées à l’environnement rhizosphérique et qui diffèrent selon le génotype de la plante. Cette sélection repose sur l’aptitude des populations microbiennes à tirer au mieux profit des composés organiques libérés, mais également sur une signalisation moléculaire à l’or…
Molecular detection and monitoring of fungal plant symbionts
2003
International audience
Contribution to the research of microbial and RedOx bio-indicators for the early characterisation of wood diseases in grapevines
2022
Grapevine trunk diseases, linked to pathogenic fungi whose mechanism of action is still poorly characterised, are responsible for grapevine decline in vineyards throughout the world, causing significant losses in productivity and yield in the wine sector. Given the current lack of effective solutions to stop the establishment of the disease and the development of symptoms, which are irreversible but often late in relation to the pathogenic infection, early diagnosis of these diseases is essential. Considering the grapevine holobiont, i.e. the grapevine and the microbiota interacting with, we hypothesise that early bio-indicators of diseases would make it possible to identify a disturbance i…
Répercussions spatiales de l’esca sur l’holobionte vigne : réponse du microbiome dans le continuum sol/feuilles
2021
Dans le cadre du projet Holoviti (Plan National Dépérissement du Vignoble), l’holobionte vigne est étudié, dans le continuum sol - racines - parties aériennes (SRP), chez des ceps symptomatiques (S) ou asymptomatiques (AS) de la forme lente d’esca (tigrures foliaires). Ces recherches ont été réalisées sur une parcelle du château de Marsannay, située sur la commune de Couchey en Côte d’Or (21). Celle-ci a été choisie car elle présente simultanément trois types de dépérissements : deux liés à des agents pathogènes, respectivement viraux (agent du court-noué) et fongiques (agents de l’esca), et un lié à des dysfonctionnements physiologiques (porte-greffe 161-49C). Cette parcelle a été cartogra…
Nouvelles données sur le genre Bragasellus (Crustacea: Isopoda: Asellidae
1996
From now on, the genus Bragasellus Henry & Magniez, 1968 includes 2 oculated and 17 stygobiotic species. As a natural and monophyletic taxonomic unit, we consider it a good genus. Its original area corresponds to the north-west quarter of the Iberian Peninsula. Secondarily, this area has extended eastward, using mainly the alluvial channels of hydrographic systems (Ríos Douro + Ebro and tributaries), finally reaching the underground waters of several Mediterranean rivers. This active expansion is exclusively due to the migration of two stygobiotic sibling species: B. lagari Henry & Magniez, 1973 towards the high basin of the Río Tajo, then downstream to the basins of the Ríos Jucar and Turi…
Nothing Left but the Core of Murmurs? : Attacks on Linking as Communication in Beckett’s The Unnamable
2022
Literary studies have usually interpreted Samuel Beckett’s The Unnamable (1959) to reflect an area void of meaning and inaccessible to representation. The present article, by contrast, argues that Beckett experientially communicates archaic psychic reality where certain contents develop in an interpersonal relationship. The article offers psychoanalytical close readings of a few key passages in the text, where the function that is integrated in the narrative voice and actively destroys connections manifests itself on different textual levels. Using the psychoanalyst Avner Bergstein’s interpretation of Wilfred Bion’s concept, “attacks on linking”, as a paradoxical form of communication, the …
The complex life-cycle of a polymorphic prokaryote epibiont of the photosynthetic bacterium Chromatium weissei
1993
In natural populations of the anaerobic phototrophic bacterium Chromatium weissei, many cells support a prokaryotic epibiont. This epibiont appears in several forms, all from the life cycle of a single species. A typical epibiont consists of one to five flattened coccoid cells stacked one above the other, perpendicular to the C. weissei surface. The cells at the proximal and distal ends of the stack are 0.6 μm in diameter and 0.8 μm in length; mid-stack cells are slightly shorter. A typical three or four cell stack is 2 μm in length. Small mesosome-like inclusions in the distal cell are involved in the development of ‘droplet’ shaped cells which are released from the end of each stack. Thes…
Isopodes Aselloïdes stygobies d’Espagne récoltés par J. Notenboom et I. Meijers, III — Le genre Proasellus: A — Espèces oculées ou microphtalmes
1992
Samples collected in underground waters of Spain by Ine Meijers and Jos Notenboom demonstrated the presence of some oculated asellids previously known: Proasellus coiffaiti, P. coxalis, and P. meridianus, and also four new stygophilous species, more or less depigmented, with different stages of regression of the ocular system: P. beticus n. sp., P. ortizi n. sp., P. aragonensis n. sp., and P. ebrensis n. sp. These forms represent relict populations of ancient epigean species. The anophthalmous species of the Aquitanian Basin, Pyrenees, and Iberian Peninsula are more closely related to P. beticus and P. ortizi than to the Recent epigean species P. coxalis and P. meridianus.
Massive presence of insertion sequences in the genome of SOPE, the primary endosymbiont of the rice weevil Sitophilus oryzae
2008
Bacteria that establish an obligate intracellular relationship with eukaryotic hosts undergo an evolutionary genomic reductive process. Recent studies have shown an increase in the number of mobile elements in the first stage of the adaptive process towards intracellular life, although these elements are absent in ancient endosymbionts. Here, the genome of SOPE, the obligate mutualistic endosymbiont of rice weevils, was used as a model to analyze the initial events that occur after symbiotic integration. During the first phases of the SOPE genome project, four different types of insertion sequence (IS) elements, belonging to well-characterized IS families from alpha-proteobacteria, were ide…