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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 organometallic compounds elucidation their abiotic biological transformations in virtually all matrices from atmospheric\, aquatic (freshwater marine)\, terrestrial (soils sediment archives) extraterrestrial compartments. finally\, it also enables measurement accurate isotopic ratios individual within complex mixtures assess previously inaccessible isotopologues. this seminar will present development various targeted non-targeted molecular biogeochemical workflows my lab\, applied characterize source pools matter terrestrial\, atmospheric marine environments biotic>