Search results for "Logique"

showing 10 items of 502 documents

New insight into the colonization processes of common voles: inferences from molecular and fossil evidence.

2008

Biologie et Gestion des Populations, Campus International de Baillarguet, Montferrier/Lez, FranceElucidating the colonization processes associated with Quaternary climatic cycles is important in order to understand the distribution of biodiversity and the evolutionary potential of temperate plant and animal species. In Europe, general evolutionary scenarios have been defined from genetic evidence. Recently, these scenarios have been challenged with genetic as well as fossil data. The origins of the modern distributions of most temperate plant and animal species could predate the Last Glacial Maximum. The glacial survival of such populations may have occurred in either southern (Mediterranea…

0106 biological sciences[ SDE.BE.BIOD ] Environmental Sciences/Biodiversity and Ecology/domain_sde.be.biodBiodiversitylcsh:Medicine[SDV.BID.SPT]Life Sciences [q-bio]/Biodiversity/Systematics Phylogenetics and taxonomy01 natural sciencesbiodiversitéEvolutionary Biology/Animal GeneticsMaximum-LikelihoodControl RegionGlacial periodévolutionlcsh:SciencePhylogenyévolution biologiqueMismatch Distributionchangement climatique0303 health sciencesMultidisciplinarybiologyArvicolinaeFossilsEcology[SDV.BID.EVO]Life Sciences [q-bio]/Biodiversity/Populations and Evolution [q-bio.PE]mammifèreFossil RecordCytochromes bEuropePhylogeographyHabitatResearch ArticleEvolutionary Biology/PaleontologyGene FlowClimatic ChangesGenetic SpeciationcolonisationMolecular DatingCytochrome b010603 evolutionary biologyQuaternary03 medical and health sciencesAnimalsMicrotusDemography030304 developmental biologyBayesian ApproachEvolutionary Biology/Evolutionary and Comparative GeneticsrongeurHuman evolutionary geneticslcsh:RGenetic Variation[SDV.BBM.BM]Life Sciences [q-bio]/Biochemistry Molecular Biology/Molecular biologySequence Analysis DNAmicrotus arvalis15. Life on landbiology.organism_classificationBiogeographic TraitsPhylogeographyGenetic SpeciationBiological dispersalAnimal Migrationlcsh:QCommon Vole

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Variations spatiales et temporelles des communautés adventices des cultures annuelles en France

2007

Although arable weed species are particularly well adapted to habitats characterised by high levels of disturbance(ploughing, harvest), the degree and rate at which agro-ecosytems have been transformed in the last 50 years in Europe(use of chemicals, changes in crop rotations) has led to profound changes in the composition and diversity of arable weedcommunities. This thesis provides an update on the composition and diversity of weed communities that can be foundacross the main crop types and regions of France. It also addresses two objectives i) applying (community) ecologytheories for the analysis and interpretation of spatial and temporal variations in weed communities and ii) using the …

0106 biological sciences[SDE] Environmental Sciences[SDV]Life Sciences [q-bio]specialistsspecies turnovercommunauté.CommunityPlant Science01 natural sciencesVALEURS INDICATRICES D'ELLENBERGarable weedCOMMUNAUTEplant functional typespecies richnessBIOVIGILANCE FLOREfield margins[SDV.EE]Life Sciences [q-bio]/Ecology environmentabundancediversité fonctionnelleGENERALISTESflora shifts04 agricultural and veterinary sciencesfunctional diversityBORD DE CHAMPGROUPE FONCTIONNEL[SDV] Life Sciences [q-bio][SDV.EE] Life Sciences [q-bio]/Ecology environmentGeographyADVENTICESNICHE ECOLOGIQUEfrequency[SDE]Environmental SciencesSPECIALISTESTURNOVERrichesse spécifiquegeneralistsniche écologiqueCHANGEMENT DE FLORE010603 evolutionary biologyEllenberg indicator valuesABONDANCERICHESSE SPECIFIQUEniche breadthfréquencecropping practices changesFREQUENCECHANGEMENT DE TECHNIQUES CULTURALESDIVERSITE FONCTIONNELLEgénéralistes040103 agronomy & agriculture0401 agriculture forestry and fisheriesspécialistesTRAITS BIOLOGIQUES

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Human-Driven Microbiological Contamination of Benthic and Hyporheic Sediments of an Intermittent Peri-Urban River Assessed from MST and 16S rRNA Gene…

2017

International audience; Rivers are often challenged by fecal contaminations. The barrier effect of sediments against fecal bacteria was investigated through the use of a microbial source tracking (MST) toolbox, and by Next Generation Sequencing (NGS) of V5-V6 16S rRNA gene (rrs) sequences. Non-metric multi-dimensional scaling analysis of V5-V6 16S rRNA gene sequences differentiated bacteriomes according to their compartment of origin i.e., surface water against benthic and hyporheic sediments. Classification of these reads showed the most prevalent operating taxonomic units (OTU) to be allocated to Flavobacterium and Aquabacterium. Relative numbers of Gaiella, Haliangium, and Thermoleophilu…

0301 basic medicinePollutionMicrobiology (medical)benthic and hyporheic sedimentsmedia_common.quotation_subject[SDV]Life Sciences [q-bio]030106 microbiologyFECA CONTAMINATIONBiologyMicrobiologyarn ribosomal 16s03 medical and health sciencesperi-urban riverzone hyporhéique14. Life underwatermedia_commonOriginal ResearchEcologyBENTHIC AND HYPORHEIC SEDIMENTSMICROBIAL COMMUNITYHIGH THROUGH PUT SEQUENCING (HTS)zone benthiquebiology.organism_classification6. Clean waterFecal coliformAquabacteriumhigh throughput sequencing (HTS)Microbial population biology13. Climate actionBenthic zonefecal contaminationperi-urban river;benthic and hyporheic sediments;microbial community;high throughput sequencing (HTS);fecal contaminationcontamination biologiquePERI-URBAN RIVERCombined sewermicrobial communitySurface waterFlavobacterium

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Transcriptome analysis revealed that a quorum sensing system regulates the transfer of the pAt megaplasmid in Agrobacterium tumefaciens.

2016

Background Agrobacterium tumefaciens strain P4 is atypical, as the strain is not pathogenic and produces a for this species unusual quorum sensing signal, identified as N-(3-hydroxy-octanoyl)-homoserine lactone (3OH,C8-HSL). Results By sequence analysis and cloning, a functional luxI-like gene, named cinI, has been identified on the At plasmid of A. tumefaciens strain P4. Insertion mutagenesis in the cinI gene and transcriptome analyses permitted the identification of 32 cinI-regulated genes in this strain, most of them encoding proteins responsible for the conjugative transfer of pAtP4. Among these genes were the avhB genes that encode a type 4 secretion system (T4SS) involved in the forma…

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Transition vers des systèmes agricole et agroalimentaire durables : quelle place et qualification pour les légumineuses à graines ?

2017

Cet article propose une analyse historique du processus de verrouillage du système agroalimentaire en défaveur des légumineuses à graines, à l’aune des théories évolutionnistes. Plusieurs mécanismes d’autorenforcement permettent de comprendre pourquoi ces espèces sont de moins en moins cultivées en France face à un système agro-industriel qui s’est spécialisé en faveur des céréales, favorisant à l’amont l’usage d’engrais azotés de synthèse et limitant à l’aval les investissements pour les légumineuses en alimentation humaine. Cet article s’interroge alors sur les perspectives de déverrouillage.