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UID:17058-1678357800-1678363200@www.cerege.fr
SUMMARY:Séminaire Spécial : Maxime Bridoux (CEA)
DESCRIPTION:“Weighting molecules with the precision of an electron to understand the biogeochemistry of organic matter on a global scale” \n\nRésumé : Molecular biogeochemistry blends concepts from geology\, chemistry\, and biology to study the cycling of biological elements (C\, N\, P\, S\, …) throughout various Earth systems. While targeted molecular biogeochemistry provide information on the regulation of individual processes and typically involve isolating and purifying individual biomarkers to analyze their stable or radioactive isotopes (d13C\, D14C\, d15N …)\, non-targeted approaches have recently emerged as new\, powerful techniques with a wealth of applications. Indeed\, non-targeted workflows are now able to characterize full molecular and isomeric complexity of organic and organometallic mixtures and track their turnover across environmental gradients in a few hundred of microliters of sample! At this stage\, organic geochemistry meets environmental metabolomic. With its unmatched mass resolving power (Rs> 1 000 000 @ m/z 400) and mass accuracy (<1 ppm)\, Fourier transform mass spectrometry (FTMS; i.e. FT-ICR MS\, Orbitrap Lumos 1M MS) is rapidly evolving into a reference analytical tool for environmental chemists\, and biogeochemists. FTMS opens the door to nontargeted\, molecular-level identification of organic and organometallic compounds and the elucidation of their abiotic and biological transformations in virtually all environmental matrices from atmospheric\, aquatic (freshwater and marine)\, terrestrial (soils and sediment archives) and extraterrestrial compartments. Finally\, it also enables the measurement of accurate isotopic ratios of individual compounds within complex mixtures and to assess previously inaccessible isotopologues. This seminar will present the development of various targeted and non-targeted molecular biogeochemical workflows in my lab\, applied to characterize the source of various pools of organic matter in terrestrial\, atmospheric and marine environments and their biotic / abiotic biogeochemical transformations. We will show that\, combined with the recent developments in advanced bioinformatic methods of visual representation of complex mass spectral features and the implementation of machine learning tools\, non-targeted (FTMS) analysis allows the discovery of information hidden in biogeochemical data\, improving our comprehension of the Earth system. \nCandidat au poste de Professeur en Géochimie Isotopique Environnementale. \nLieu : Salle 205
URL:https://www.cerege.fr/fr/agenda/seminaire-special-maxime-bridoux-cea/
LOCATION:Technopôle de l’Arbois\, Aix-en-Provence\, BP80 13 545\, France
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UID:16422-1678367700-1678374000@www.cerege.fr
SUMMARY:Grand séminaire : Lars-Eric Heimburger-Boavida (MIO)
DESCRIPTION:Amphithéâtre Pasteur\, CEREGE Arbois\n\n\n\n“Mercury budgets telling stories” \nRésumé : The seminar will be about mercury and methylmercury budgets\, starting from a small but relevant basin\, the Arctic Ocean\, a prime study area because of the apparent high ecosystem and human exposure. International efforts have now made the Arctic Ocean one of the best observed basins and its small size allows to built comprehensive budgets. Then i will attempt to scale this approach up and revise the global mercury budget. \nL’événement commencera par un café servi devant l’amphi Pasteur à 13h15. \nLa présentation sera en français et sera disponible en streaming (http://streaming-a.osupytheas.fr/embed/live.html) \n\n\n\n\n  \n\nLieu\nAmphi Pasteur
URL:https://www.cerege.fr/fr/agenda/grand-seminaire-lars-eric-heimburger-boavida-mio/
LOCATION:Technopôle de l’Arbois\, Aix-en-Provence\, BP80 13 545\, France
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