207 research outputs found

    Assessing seasonal and interannual changes in carbonate chemistry across two time-series sites in the North Western Mediterranean Sea

    Get PDF
    Sustained time-series measurements are crucial to understand changes in oceanic carbonate chemistry. In the North Western Mediterranean Sea, the temporal evolution of the carbonate system is here investigated based on two 10-year time-series (between January 2010 and December 2019) of monthly carbonate parameters measurements at two sampling sites in the Ligurian Sea (ANTARES and DYFAMED). At seasonal timescale, the seawater partial pressure of CO2 (pCO2) within the mixed layer is mostly driven by temperature at both sites, and biological processes as stated by the observed relationships between total inorganic carbon (CT), nitrate and temperature. This study suggests also that mixing and water masses advection could play a role in modulating the CT content. At decadal timescale, significant changes in ocean chemistry are observed with increasing trends in CT (+3.2 ± 0.9 ”mol.kg−1.a−1 – ANTARES; +1.6 ± 0.8 ”mol.kg−1.a−1 – DYFAMED), associated with increasing pCO2 trends and decreasing trends in pH. The magnitude of the increasing trend in CT at DYFAMED is consistent with the increase in atmospheric pCO2 and the anthropogenic carbon transport of water originating from the Atlantic Ocean, while the higher trends observed at the ANTARES site could be related to the hydrological variability induced by the variability of the Northern Current

    La fĂȘlure chez Francis Scott Fitzgerald : un Ă©clairage psychologique

    No full text
    Dans ce mĂ©moire, nous nous penchons sur la vie, l’Ɠuvre et le rapport Ă  l’Ɠuvre de Scott Fitzgerald, Ă©crivain de la gĂ©nĂ©ration perdue des annĂ©es vingt. En proie Ă  l’alcool, il Ă©crira tout ce qu’il peut Ă©crire sur le fait qu’il ne sait plus Ă©crire dans une brillante nouvelle intitulĂ©e La fĂȘlure en 1936. Elle dĂ©crit de maniĂšre poignante l’effondrement d’un homme, d’une vie. La premiĂšre phrase de ce texte donne le ton : « Toute vie est une processus de dĂ©molition ». Cette fĂȘlure est reprĂ©sentĂ©e Ă  travers tous ses romans autobiographiques. Comment comprendre dĂšs lors cette fĂȘlure ? Quel est le rapport entre sa fĂȘlure, l’alcool et l’écriture ? Par quel procĂ©dĂ© a-t-il pu dĂ©passer cette incapacitĂ© d’écrire pour engendrer un nouveau geste d’écriture ? Autant de questions que nous tenterons d’éclairer par une analyse qualitative et inductive du support biographique Ă  notre disposition, en appui sur un cadre de rĂ©fĂ©rence thĂ©orique psychanalytique et philosophique de typologie littĂ©raire et psychologique.Master [120] en sciences psychologiques, UniversitĂ© catholique de Louvain, 201

    Magnetoreception in Microorganisms

    No full text
    International audienceMagnetoreception is the sense whereby organisms geolocate and navigate in response to the Earth's magnetic field lines. For decades, magnetotactic bacteria have been the only known magnetoreceptive microorganisms. The magnetotactic behaviour of these aquatic prokaryotes is due to the biomineralization of magnetic crystals. While an old report alleged the existence of microbial algae with similar behaviour, recent discoveries have demonstrated the existence of unicellular eukaryotes able to sense the geomagnetic field, and have revealed different mechanisms and strategies involved in such a sensing. Some ciliates can be magnetically guided after predation of magnetotactic bacteria, while some flagellates acquired this sense through symbiosis with magnetic bacteria. A report has even suggested that some magnetotactic protists could biomineralize magnetic crystals

    Magnetospirillum gryphiswaldense

    No full text
    International audienc
    • 

    corecore