A5055033041- Heavy metals in environment
- Plant Micronutrient Interactions and Effects
- Plant Stress Responses and Tolerance
- Mercury impact and mitigation studies
- Heavy Metals in Plants
- Aluminum toxicity and tolerance in plants and animals
- CO2 Sequestration and Geologic Interactions
- Geochemistry and Elemental Analysis
- Methane Hydrates and Related Phenomena
- Mine drainage and remediation techniques
- Radioactive element chemistry and processing
- Analytical chemistry methods development
- X-ray Spectroscopy and Fluorescence Analysis
- Ion-surface interactions and analysis
- Trace Elements in Health
- Microbial Community Ecology and Physiology
- Geochemistry and Geologic Mapping
- Heavy Metal Exposure and Toxicity
- Plant Water Relations and Carbon Dynamics
- Anaerobic Digestion and Biogas Production
- Electron and X-Ray Spectroscopy Techniques
- Calcium Carbonate Crystallization and Inhibition
- Plant responses to water stress
- Selenium in Biological Systems
- Algal biology and biofuel production
Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux
2015-2025
Université de Pau et des Pays de l'Adour
2013-2025
Centre National de la Recherche Scientifique
2011-2024
Laboratoire de Chimie
2014-2015
Institut des Sciences de la Terre
2010-2011
Université Gustave Eiffel
2010-2011
Université Joseph Fourier
2002-2010
Université Grenoble Alpes
2001-2010
Laboratoire des Écoulements Géophysiques et Industriels
2005-2007
CEA LITEN
2005-2006
This first multidisciplinary study simulating the H 2 arrival in deep aquifers used as geological storage shows importance of microorganisms.
Certain molecular mechanisms of Cd tolerance and accumulation have been identified in the model species Arabidopsis halleri, while intraspecific variability these traits shoot detoxification were little addressed. The metallicolous non-metallicolous A. halleri populations from different genetic units tested controlled conditions. In addition, changes cell wall composition investigated using Fourier transform infrared spectroscopy. Indeed, recent works on suggest sequestration both inside...
Arabidopsis halleri is a model plant for Zn and Cd hyperaccumulation. The objective of this study was to determine the relationship between chemical forms Cd, its distribution in leaves, accumulation tolerance. An interspecific cross carried out A. non-tolerant non-hyperaccumulating relative lyrata providing progenies segregating tolerance accumulation. speciation were investigated using X-ray absorption spectroscopy microfocused fluorescence. In progenies, coordinated by S atoms only or...
Massive storage of dihydrogen (H2) in underground geological (UGSs) will be necessary to meet future H2 production ambitions. Such deep aquifers was simulated a high-pressure reactor, and the evolution 3 phases (natural gas/H2, formation water rock) with autochthonous microorganisms monitored over several weeks. These results show that methanogens do not necessarily dominate community, but sulfate-reducing activity formate bioproduction are systematically present. The experimental data were...
Abstract Tobacco (Nicotiana tabacum L. cv Xanthi) plants were exposed to toxic levels of zinc (Zn). Zn exposure resulted in toxicity signs plants, and these damages partly reduced by a calcium (Ca) supplement. Confocal imaging intracellular using Zinquin showed that was preferentially accumulated trichomes. Exposure + Ca increased the trichome density induced production Ca/Zn mineral grains on head cells These aggregates submicrometer-sized crystals poorly crystalline material contained as...
• The purpose of this study was to investigate the relationship between chemical form and localization zinc (Zn) in plant leaves their Zn accumulation capacity. An interspecific cross Arabidopsis halleri sp. lyrata petrea segregating for used. Zinc speciation distribution parent plants selected F1 F2 progenies were investigated by spectroscopic microscopic techniques analyses. A correlation observed proportion being octahedral coordination complexed organic acids free solution (Zn–OAs +...
An important application field of secondary ion mass spectrometry at the nanometer scale (NanoSIMS) is detection chemical elements and, in particular, metals subcellular level biological samples. The many trace requires an oxygen primary source to allow generation positive ions with high yield NanoSIMS. duoplasmatron commonly used this microprobe but cannot achieve same quality images as cesium produce negative (C–, CN–, S–, P–) due a larger beam size. In paper, new type using rf plasma...
Paspalum urvillei and Setaria parviflora are two plant species naturally adapted to iron-rich environments such as around iron mines wastes. The aim of our work was characterize how these cope with extreme conditions by comparing them related model species, Oryza sativa viridis, that appeared be much less tolerant Fe excess. Both were able limit the amount accumulated within roots shoots, compared species. Perls/DAB staining in root cross sections indicated responded through build-up plaque...
Methylmercury (MeHg) is highly toxic and mainly produced in anoxic environments by certain microorganisms. Net MeHg production involves a series of separate cellular processes: the uptake inorganic divalent Hg (Hg(II)) cell, intracellular enzymatic Hg(II) methylation, release into extracellular medium, as well demethylation. As biological process, saturation at level can be anticipated all stages transformation. The aim this study was to investigate kinetics methylation demethylation over...
Mercury methylation by anaerobic microorganisms, including sulfate-reducing bacteria (SRB), is a key process in the production of neurotoxic methylmercury (MeHg). The chemical speciation mercury (Hg) strongly influences its bioavailability as well potential for and demethylation, with sulfur-containing ligands playing critical role these processes. In this study, we used isotopically enriched species ( 199 Hg(II), Me 202 Hg) to investigate how molecular affects both demethylation processes...
Hexavalent chromium (Cr(VI)) occurrence in soils is generally determined using an extraction step to transfer it the liquid phase where more easily detected and quantified. In this work, performance of most common procedure (EPA Method 3060A) NaOH-Na(2)CO(3) solutions evaluated X-ray absorption near edge structure spectroscopy (XANES), which enables quantification Cr(VI) directly solid state. Results obtained with both methods were compared for three samples different matrices: a soil...