Gorges de la Haute-Dordogne

Une étude historique et documentaire a été réalisée sur le territoire de la communauté de communes des Gorges de la Haute-Dordogne. Deux problématiques ont été soulevées : les origines et l'histoire des établissements casadéens et le réseau des châteaux liés aux vicomtes de Ventadour et de Turenne. Cette étude réalisée en 2005-2006 a débuté par une recherche documentaire approfondie, de nombreux fonds d'archives publiques ont été dépouillés ainsi que des fonds privés (documents de la famille ..

Gorges de la Haute-Dordogne

Une étude historique et documentaire a été réalisée sur le territoire de la communauté de communes des Gorges de la Haute-Dordogne. Deux problématiques ont été soulevées : les origines et l'histoire des établissements casadéens et le réseau des châteaux liés aux vicomtes de Ventadour et de Turenne. Cette étude réalisée en 2005-2006 a débuté par une recherche documentaire approfondie, de nombreux fonds d'archives publiques ont été dépouillés ainsi que des fonds privés (documents de la famille ..

Felletin

Identifiant de l'opération archéologique : 122331 Date de l'opération : 2005 (PI) Dans le cadre de « l’inventaire général du patrimoine architectural et mobilier de la commune de Felletin » engagé en 2002, la ville de Felletin, le conseil général de la Creuse et la DRAC du Limousin pour l’Etat ont souhaité la réalisation d'une étude historique et documentaire de la ville, en orientant les problématiques sur la question des origines et de la genèse de la ville médiévale de Felletin qui devait ..

Genome analysis of the necrotrophic fungal pathogens Sclerotinia sclerotiorum and Botrytis cinerea

Sclerotinia sclerotiorum and Botrytis cinerea are closely related necrotrophic plant pathogenic fungi notable for their wide host ranges and environmental persistence. These attributes have made these species models for understanding the complexity of necrotrophic, broad host-range pathogenicity. Despite their similarities, the two species differ in mating behaviour and the ability to produce asexual spores. We have sequenced the genomes of one strain of S. sclerotiorum and two strains of B. cinerea. The comparative analysis of these genomes relative to one another and to other sequenced fungal genomes is provided here. Their 38–39 Mb genomes include 11,860–14,270 predicted genes, which share 83% amino acid identity on average between the two species. We have mapped the S. sclerotiorum assembly to 16 chromosomes and found large-scale co-linearity with the B. cinerea genomes. Seven percent of the S. sclerotiorum genome comprises transposable elements compared t

Multidisciplinary investigation on cold seeps with vigorous gas emissions in the Sea of Marmara (MarsiteCruise): Strategy for site detection and sampling and first scientific outcome

MarsiteCruise was undertaken in October/November 2014 in the Sea of Marmara to gain detailed insight into the fate of fluids migrating within the sedimentary column and partially released into the water column. The overall objective of the project was to achieve a more global understanding of cold-seep dynamics in the context of a major active strike-slip fault. Five remotely operated vehicle (ROV) dives were performed at selected areas along the North Anatolian Fault and inherited faults. To efficiently detect, select and sample the gas seeps, we applied an original procedure. It combines sequentially (1) the acquisition of ship-borne multibeam acoustic data from the water column prior to each dive to detect gas emission sites and to design the tracks of the ROV dives, (2) in situ and real-time Raman spectroscopy analysis of the gas stream, and (3) onboard determination of molecular and isotopic compositions of the collected gas bubbles. The in situ Raman spectroscopy was used as a decision-making tool to evaluate the need for continuing with the sampling of gases from the discovered seep, or to move to another one. Push cores were gathered to study buried carbonates and pore waters at the surficial sediment, while CTD-Rosette allowed collecting samples to measure dissolved-methane concentration within the water column followed by a comparison with measurements from samples collected with the submersible Nautile during the Marnaut cruise in 2007. Overall, the visited sites were characterized by a wide diversity of seeps. CO2- and oil-rich seeps were found at the westernmost part of the sea in the Tekirdag Basin, while amphipods, anemones and coral populated the sites visited at the easternmost part in the Cinarcik Basin. Methane-derived authigenic carbonates and bacterial mats were widespread on the seafloor at all sites with variable size and distributions. The measured methane concentrations in the water column were up to 377 μmol, and the dissolved pore-water profiles indicated the occurrence of sulfate depleting processes accompanied with carbonate precipitation. The pore-water profiles display evidence of biogeochemical transformations leading to the fast depletion of seawater sulfate within the first 25-cm depth of the sediment. These results show that the North Anatolian Fault and inherited faults are important migration paths for fluids for which a significant part is discharged into the water column, contributing to the increase of methane concentration at the bottom seawater and favoring the development of specific ecosystems

Genomic Analysis of the Necrotrophic Fungal Pathogens Sclerotinia sclerotiorum and Botrytis cinerea

Sclerotinia sclerotiorum and Botrytis cinerea are closely related necrotrophic plant pathogenic fungi notable for their wide host ranges and environmental persistence. These attributes have made these species models for understanding the complexity of necrotrophic, broad host-range pathogenicity. Despite their similarities, the two species differ in mating behaviour and the ability to produce asexual spores. We have sequenced the genomes of one strain of S. sclerotiorum and two strains of B. cinerea. The comparative analysis of these genomes relative to one another and to other sequenced fungal genomes is provided here. Their 38–39 Mb genomes include 11,860–14,270 predicted genes, which share 83% amino acid identity on average between the two species. We have mapped the S. sclerotiorum assembly to 16 chromosomes and found large-scale co-linearity with the B. cinerea genomes. Seven percent of the S. sclerotiorum genome comprises transposable elements compared to <1% of B. cinerea. The arsenal of genes associated with necrotrophic processes is similar between the species, including genes involved in plant cell wall degradation and oxalic acid production. Analysis of secondary metabolism gene clusters revealed an expansion in number and diversity of B. cinerea–specific secondary metabolites relative to S. sclerotiorum. The potential diversity in secondary metabolism might be involved in adaptation to specific ecological niches. Comparative genome analysis revealed the basis of differing sexual mating compatibility systems between S. sclerotiorum and B. cinerea. The organization of the mating-type loci differs, and their structures provide evidence for the evolution of heterothallism from homothallism. These data shed light on the evolutionary and mechanistic bases of the genetically complex traits of necrotrophic pathogenicity and sexual mating. This resource should facilitate the functional studies designed to better understand what makes these fungi such successful and persistent pathogens of agronomic crops

Sainte-Marie (Cantal). Pont de Tréboul

Le pont de Tréboul (commune de Sainte-Marie) est inscrit aux monuments historiques par arrêté du 19 mai 1927. Certaines références, mises en exergue par d'éminents chercheurs tel Marcellin Boudet, ont semble-t-il servi à classer ce pont parmi les ouvrages du xive-xve s. Il semblerait que ces origines soient plus anciennes. La vidange du barrage de Sarrans de 2014 a permis d'avoir de nouveau accès au pont de Tréboul et d'en étudier les élévations. Cette analyse avait pour but de distinguer les..

Limoges (Haute-Vienne). Abbaye Saint-Martial, église du Sauveur

La création d’un café à l’angle de la place de la République et de la rue Saint-Martial, nécessitant une modification des réseaux ERDF, a motivé un suivi archéologique des travaux, préconisé par le SRA. Le premier sondage de 0,80 x 0,80 m a été arrêté dès la découverte d’une maçonnerie, moins de 0,20 m sous le sol actuel. Le mur, dégagé sur une assise seulement, a été relevé et photographié. Le deuxième, suivi de travaux (sondage 2), s’est déroulé un mois plus tard. La tranchée de 8 m de long..

La chapelle comtale de Sainte-Fortunade (troisième partie)

International audienc

La chapelle comtale de Sainte-Fortunade (première partie)

International audienc