Search results for "FIXATION BIOLOGIQUE DE L'AZOTE"

showing 4 items of 4 documents

Database of diazotrophs in global ocean: abundance, biomass and nitrogen fixation rates

2012

Marine N<sub>2</sub> fixing microorganisms, termed diazotrophs, are a key functional group in marine pelagic ecosystems. The biological fixation of dinitrogen (N<sub>2</sub>) to bioavailable nitrogen provides an important new source of nitrogen for pelagic marine ecosystems and influences primary productivity and organic matter export to the deep ocean. As one of a series of efforts to collect biomass and rates specific to different phytoplankton functional groups, we have constructed a database on diazotrophic organisms in the global pelagic upper ocean by compiling about 12 000 direct field measurements of cyanobacterial diazotroph abundances (based on microscopic …

0106 biological sciencesBiogeochemical cyclePHYTOPLANCTON010504 meteorology & atmospheric sciencesPRODUCTION PRIMAIREFONCTIONNEMENT DE L'ECOSYSTEMEBiologycomputer.software_genre01 natural sciencesDeep seaABONDANCEAbundance (ecology)PhytoplanktonEcosystem14. Life underwaterlcsh:Environmental sciences0105 earth and related environmental scienceslcsh:GE1-350Biomass (ecology)BIOMASSEDatabase010604 marine biology & hydrobiologyFIXATION BIOLOGIQUE DE L'AZOTElcsh:QE1-996.5MICROORGANISMEPelagic zoneBASE DE DONNEESlcsh:GeologyOceanography13. Climate action[SDU]Sciences of the Universe [physics]MILIEU MARINNitrogen fixationGeneral Earth and Planetary Sciencescomputer
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Genotypic characterization of Bradyrhizobium strains nodulating small Senegalese legumes by 16S-23S rRNA intergenic gene spacers and amplified fragme…

2000

ABSTRACT We examined the genotypic diversity of 64 Bradyrhizobium strains isolated from nodules from 27 native leguminous plant species in Senegal (West Africa) belonging to the genera Abrus , Alysicarpus , Bryaspis , Chamaecrista , Cassia , Crotalaria , Desmodium , Eriosema , Indigofera , Moghania , Rhynchosia , Sesbania , Tephrosia , and Zornia , which play an ecological role and have agronomic potential in arid regions. The strains were characterized by intergenic spacer (between 16S and 23S rRNA genes) PCR and restriction fragment length polymorphism (IGS PCR-RFLP) and amplified fragment length polymorphism (AFLP) fingerprinting analyses. Fifty-three reference strains of the different B…

DNA BacterialGenotypeTECHNIQUE RFLPBACTERIEBiologyDNA RibosomalPolymerase Chain ReactionApplied Microbiology and BiotechnologyBradyrhizobiumPlant MicrobiologyIntergenic regionRNA Ribosomal 16SGenotypeBotanyCluster AnalysisBradyrhizobiumSYMBIOSERibosomal DNA[SDV.EE]Life Sciences [q-bio]/Ecology environmentGeneticsPlants MedicinalEcologyFIXATION BIOLOGIQUE DE L'AZOTELEGUMINEUSEfood and beveragesFabaceaeRibosomal RNAbiology.organism_classificationDNA FingerprintingAmplified Ribosomal DNA Restriction AnalysisSenegalBacterial Typing TechniquesGENOTYPERNA Ribosomal 23S[SDV.EE] Life Sciences [q-bio]/Ecology environmentNODOSITE VEGETALEPOLYMORPHISME GENETIQUEDNA IntergenicAmplified fragment length polymorphismRestriction fragment length polymorphismANALYSE GENETIQUEPolymorphism Restriction Fragment LengthFood ScienceBiotechnology
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Biological nitrogen fixation for the 21st century

1998

The biodiversity of nitrogen-fixing organisms is huge. Taxonomic and phylogenetic research is needed to structure this diversity, to facilitate communication among scientists, and to increase our understanding of the evolution and biology of diazotrophs. Molecular tools for taxonomic and biodiversity studies of diazotrophic rhizobia, frankiae, cyanobacteria and bacilli are presented in sections 2 to 5. Sections 6 to 9 focus on problems with genus and species assignment.

[SDE] Environmental SciencesBacilli[SDV]Life Sciences [q-bio]BiodiversityTECHNIQUE RFLPBACTERIETAXONOMIERhizobia03 medical and health sciencesPhylogeneticsTECHNIQUE PCRETUDE COMPARATIVEPHYLOGENIESYMBIOSEComputingMilieux_MISCELLANEOUS0303 health sciencesbiologyPhylogenetic tree030306 microbiologyEcologyLEGUMINEUSEFIXATION BIOLOGIQUE DE L'AZOTE04 agricultural and veterinary sciencesLoess plateauDIVERSITE GENETIQUEbiology.organism_classification[SDV] Life Sciences [q-bio][SDE]Environmental Sciences040103 agronomy & agriculture0401 agriculture forestry and fisheriesETUDE EXPERIMENTALETaxonomy (biology)Diazotroph
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Acacias du Sahel : un espoir pour l'agriculture

1994

National audience

[SDV] Life Sciences [q-bio][SDE] Environmental SciencesAGRICULTUREFERTILITE DU SOL[SDV]Life Sciences [q-bio][SDE]Environmental SciencesFIXATION BIOLOGIQUE DE L'AZOTEAGRONOMIESYMBIOSEMYCORHIZELEGUMINEUSE ARBORESCENTEComputingMilieux_MISCELLANEOUS
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