A5031872328- Microbial Community Ecology and Physiology
- Protist diversity and phylogeny
- Genomics and Phylogenetic Studies
- Methane Hydrates and Related Phenomena
- Paleontology and Stratigraphy of Fossils
- Environmental DNA in Biodiversity Studies
- Marine and coastal ecosystems
- Geochemistry and Elemental Analysis
- Bacteriophages and microbial interactions
- Geology and Paleoclimatology Research
- Hydrocarbon exploration and reservoir analysis
- Parasitic Infections and Diagnostics
- Calcium Carbonate Crystallization and Inhibition
- Marine Biology and Ecology Research
- Marine Toxins and Detection Methods
- Space Science and Extraterrestrial Life
- RNA and protein synthesis mechanisms
- Bacterial Genetics and Biotechnology
- Origins and Evolution of Life
- Legume Nitrogen Fixing Symbiosis
- Evolution and Genetic Dynamics
- Geochemistry and Geologic Mapping
- Planetary Science and Exploration
- Plant Virus Research Studies
- Marine and environmental studies
AgroParisTech
2016-2025
Centre National de la Recherche Scientifique
2016-2025
Écologie, Systématique et Évolution
2016-2025
Université Paris-Saclay
2016-2025
Université Paris-Sud
2012-2023
Instituto Nacional de Toxicología y Ciencias Forenses
2023
Nestlé (Switzerland)
2016
St. Petersburg Department of Steklov Institute of Mathematics
2015
Université Paris Cité
2006
Sorbonne Université
2002-2006
Carbon fixation by chemoautotrophic microorganisms in the dark ocean has a major impact on global carbon cycling and ecological relationships ocean's interior, but relevant taxa energy sources remain enigmatic. We show evidence that nitrite-oxidizing bacteria affiliated with Nitrospinae phylum are important chemoautotrophy. Single-cell genomics community metagenomics revealed most abundant globally distributed ocean. Metaproteomics metatranscriptomics analyses suggest nitrite oxidation is...
Keep It Inside Some cyanobacteria form solid-phase calcium carbonate precipitates as a consequence of fixing CO 2 during photosynthesis. Usually, such carbonates extracellularly near the surface cells, sometimes generating structures called stromatolites. In biofilm growing on deposits in Lake Alchichica, Mexico, Couradeau et al. (p. 459; see Perspective by Riding ) discovered one species that also amorphous particles internally. Because structure and chemical composition these is distinct...
Significance Cyanobacteria are known to promote the precipitation of Ca-carbonate minerals by photosynthetic uptake inorganic carbon. This process has resulted in formation carbonate deposits and a fossil record importance for deciphering evolution cyanobacteria their impact on global carbon cycle. Though mechanisms cyanobacterial calcification remain poorly understood, this is invariably thought as extracellular indirect by-product metabolic activity. Here, we show that contrary common...
The diversity and mode of life microbial eukaryotes in hydrothermal systems is very poorly known. We carried out a molecular survey based on 18S ribosomal RNA genes present different niches at the Mid-Atlantic Ridge. These included metal-rich rare-earth-element-rich sediments Rainbow site, fluid–seawater mixing regions, colonization devices (microcolonizers) containing organic, iron-rich, porous mineral substrates that were exposed for 15 days to fluid source. identified considerable...
Microbialites are sedimentary deposits associated with microbial mat communities and thought to be evidence of some the oldest life on Earth. Despite extensive studies such deposits, little is known about role microorganisms in their formation. In addition, unambiguous criteria proving biogenicity have yet established. this study, we characterize modern calcareous microbialites from alkaline Lake Van, Turkey, at nanometer scale by combining x-ray electron microscopies. We describe a simple...
Small eukaryotic species (<1 mm) are thought to behave as prokaryotes in that, lacking geographical barriers their dispersal due tiny size, they ubiquitous. Accordingly, the absence of insulation would imply existence a relatively small number microeukaryotic species. To test these ideas, we sequenced and compared several nuclear, mitochondrial, chloroplast genes from isolates marine picoeukaryotic alga (∼2 μm), Micromonas pusilla, collected worldwide. Independent combined phylogenetic...
Summary We report here a molecular survey based on 16S rRNA genes of the bacterial diversity found in two deep‐sea vent niches at Mid‐Atlantic Ridge: hydrothermal sediment (Rainbow site), and microcolonizers made three different substrates (organic‐rich, iron‐rich pumice) that were exposed for 15 days to emission. Bacterial samples was scattered through many divisions. The most abundant diverse environmental sequences (phylotypes) our libraries corresponded Gammaproteobacteria, followed by...
Background Metagenomics is emerging as a powerful method to study the function and physiology of unexplored microbial biosphere, causing us re-evaluate basic precepts ecology evolution. Most marine metagenomic analyses have been nearly exclusively devoted photic waters. Methodology/Principal Findings We constructed fosmid library from 3,000 m-deep Mediterranean plankton, which much warmer (∼14°C) than waters similar depth in open oceans (∼2°C). analyzed both by phylogenetic screening based...
Classical studies on protist diversity of freshwater environments worldwide have led to the idea that most species microbial eukaryotes are known. One exemplary case would be constituted by ciliates, which been claimed encompass a few thousands ubiquitous species, them already described. Recently, molecular methods revealed an unsuspected diversity, especially in oceanic as well some extreme environments, suggesting occurrence hidden eukaryotic lineages. In order test if this holds also for...
Given their ecological and medical importance, the classification of kinetoplastid protists (class Kinetoplastea) has attracted much scientific attention for a long time. Morphology-based taxonomic schemes distinguished two major groups: strictly parasitic, uniflagellate trypanosomatids biflagellate bodonids. Molecular phylogenetic analyses based on 18S rRNA sequence comparison suggested that emerged from within However, these revealed huge evolutionary distance between kinetoplastids...
Summary Lost City is a unique off‐axis hydrothermal vent field characterized by highly alkaline and relatively low‐temperature fluids that harbours huge carbonate chimneys. We have carried out molecular survey based on 18S rDNA sequences of the eukaryotic communities associated with fluid–seawater interfaces carbonates from venting areas chimney wall. Our study reveals variety lineages belonging to eight major taxa: Metazoa, Fungi, Heterokonta (Stramenopiles), Alveolata, Radiolaria,...