A5054641775- Paleontology and Stratigraphy of Fossils
- Hydrocarbon exploration and reservoir analysis
- Geological and Geochemical Analysis
- Geochemistry and Geologic Mapping
- Geochemistry and Elemental Analysis
- Geological and Geophysical Studies
- Algal biology and biofuel production
- Geology and Paleoclimatology Research
- Photosynthetic Processes and Mechanisms
- Mineralogy and Gemology Studies
- Light effects on plants
- Pleistocene-Era Hominins and Archaeology
- Porphyrin and Phthalocyanine Chemistry
- Evolution and Paleontology Studies
- Image Processing and 3D Reconstruction
- Geochemistry and Geochronology of Asian Mineral Deposits
- Geological and Geophysical Studies Worldwide
- Tree-ring climate responses
- Arsenic contamination and mitigation
- X-ray Spectroscopy and Fluorescence Analysis
- Heavy metals in environment
- Microbial Community Ecology and Physiology
- Advanced X-ray Imaging Techniques
- Soil and Environmental Studies
- Biocrusts and Microbial Ecology
University of Liège
2015-2024
Centre de Biophysique Moléculaire
2024
Institut de physique du globe de Paris
2013-2018
Sorbonne Paris Cité
2013-2018
Université Paris Cité
2013-2018
Centre National de la Recherche Scientifique
2013-2018
University of Modena and Reggio Emilia
2016-2018
Czech Academy of Sciences, Institute of Geology
2017
Sedimentary rocks containing microfossils are crucial archives to reconstitute early life evolution on Earth. However, the preservation of within depends several physico-chemical factors. Among these factors, thermal host can be decisive. Here, we investigated carbonaceous shale samples exquisitely preserved organic-walled assemblages from three Proterozoic shallow marine sedimentary sequences: Mbuji-Mayi Supergroup (Democratic Republic Congo, Congo Basin), Atar/El Mreïti Group (Mauritania,...
Thermodynamic modeling has recently suggested that condensed carbonaceous matter should be the dominant product of abiotic organic synthesis during serpentinization, although it not yet been described in natural serpentinites. Here we report evidence for three distinct types paragenetic equilibrium with low-temperature mineralogical assemblages hosted by magma-impregnated, mantle-derived, serpentinites Ligurian Tethyan ophiolite. The first type coats hydroandraditic garnets bastitized...
A distributed fast-acquisition system for synchronized multi-technique experiments is presented, in which the collection of metadata and asynchronous merging large data volumes from multiple detectors are managed as part process. This fast continuous scanning scheme, named FLYSCAN, enables measurement microscopy on a timescale milliseconds per pixel. Proof-of-principle experiments, namely X-ray fluorescence spectrometry combined with absorption, differential phase contrast dark-field...
Abstract The acquisition of photosynthesis is a fundamental step in the evolution eukaryotes. However, few phototrophic organisms are unambiguously recognized Precambrian record. situ detection metabolic byproducts individual microfossils key for direct identification their metabolisms. Here, we report new integrative methodology using synchrotron-based X-ray fluorescence and absorption. We evidence bound nickel-geoporphyrins moieties low-grade metamorphic rocks, preserved within cells ~1...
The use of metals as biosignatures in the fossil stromatolite record requires understanding processes controlling initial metal(loid) incorporation and diagenetic preservation living microbialites. Here, we report distribution organic fraction within lithifying microbialite hypersaline Big Pond Lake (Bahamas). Using synchrotron-based X-ray microfluorescence, confocal, biphoton microscopies at different scales (cm-μm) combination with traditional geochemical analyses, show that cation...
Abstract Microbial sulfate reduction ( MSR ) is thought to have operated very early on Earth and often invoked explain the occurrence of sedimentary sulfides in rock record. Sedimentary can also form from produced abiotically during late diagenesis or metamorphism. As both biotic abiotic processes contribute bulk sulfides, tracing back original microbial signature earliest record challenging. We present situ sulfur isotope data nanopyrites occurring carbonaceous remains lining domical shape...
We present MapIT!, a MATLAB routine allowing fast reduction and imaging of LA-ICP-MS data in user-friendly environment.
Deciphering the fossil record of cyanobacteria is crucial to understand their role in chemical and biological evolution early Earth. They profoundly modified redox conditions ecosystems more than 2.4 Ga ago, age Great Oxidation Event (GOE), provided ancestor chloroplast by endosymbiosis, leading diversification photosynthetic eukaryotes. Here, we analyze morphology, ultrastructure, composition, metals distribution Polysphaeroides filiformis from 1040–1006 Ma Mbuji-Mayi Supergroup (DR Congo)....
Ultraviolet (UV)-screening compounds represent a substantial asset for the survival of cyanobacteria in extreme environments exposed to high doses UV radiations on modern and early Earth. Among these molecules, halochromic pigment gloeocapsin remains poorly characterized studied. In this study, we identified gloeocapsin-producing cultivable cyanobacteria: strain Phormidesmis nigrescens ULC007. We succeeded extract, partially purify, compare dark blue from both ULC007 culture an environmental...
This exploratory study focuses on the elemental analysis by p-XRF (portable X-Ray Fluorescence Analyser) of 62 samples coarse wares, consisting Bronze Age handmade burnished ware, so-called Impasto, and Cooking ware (dated from Roman period to Modern times). All wares originate site San Vincenzo, Stromboli, Aeolian Islands. The question addressed here is whether it possible differentiate between local (Aeolian) imported (non-Aeolian) fabrics with use p-XRF; 42 were also subjected...