A5060475019- Microbial Community Ecology and Physiology
- Mercury impact and mitigation studies
- Microbial bioremediation and biosurfactants
- Genomics and Phylogenetic Studies
- Mine drainage and remediation techniques
- Heavy Metal Exposure and Toxicity
- Chromium effects and bioremediation
- NMR spectroscopy and applications
- Heavy metals in environment
- Petroleum Processing and Analysis
- Wastewater Treatment and Nitrogen Removal
- Marine and coastal ecosystems
- Metal Extraction and Bioleaching
- Water Treatment and Disinfection
- Marine Biology and Ecology Research
- Methane Hydrates and Related Phenomena
- Analytical chemistry methods development
- Toxic Organic Pollutants Impact
- Oil Spill Detection and Mitigation
- Aquaculture disease management and microbiota
- Marine animal studies overview
- Environmental DNA in Biodiversity Studies
- Arsenic contamination and mitigation
- Aquatic Ecosystems and Phytoplankton Dynamics
- Adsorption and biosorption for pollutant removal
Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux
2016-2025
Université de Pau et des Pays de l'Adour
2016-2025
Centre National de la Recherche Scientifique
2015-2024
Université de Bordeaux
1999-2002
Ifremer
1999
ABSTRACT In order to evaluate the impact of an urban effluent on antibiotic resistance freshwater bacterial populations, water samples were collected from Arga river (Spain), upstream and downstream wastewater discharge city Pamplona. Strains Enterobacteriaceae (representative human animal commensal flora) (110 isolates) Aeromonas (typically waterborne bacteria) (118 selected for susceptibility testing. Most strains (72%) many (20%) resistant nalidixic acid. Singly acid-resistant frequent...
The bacterial diversity of a chronically oil-polluted retention basin sediment located in the Berre lagoon (Etang-de-Berre, France) was investigated. This study combines chemical and molecular approaches order to define how situ petroleum hydrocarbon contamination level affects community structure subsurface sediment. Hydrocarbon content analysis clearly revealed gradient both water following periphery from pollution input water. nC17 pristane concentrations suggested alkane biodegradation...
Mudflats and salt marshes are habitats at the interface of aquatic terrestrial systems that provide valuable services to ecosystems. Therefore, it is important determine how catastrophic incidents, such as oil spills, influence microbial communities in sediment pivotal function ecosystem identify oil-degrading microbes mitigate damage ecosystem. In this study, an spill was simulated by use a tidal chamber containing intact diatom-dominated cores from temperate mudflat. Changes composition...
The sources and factors controlling concentrations of monomethylmercury (MMHg) in aquatic ecosystems need to be better understood. Here, we investigated Hg transformations sediments, periphyton associated with green algae's or plants, benthic biofilms from the Lake Titicaca hydrosystem compared them occurrence active methylating microorganisms extracellular ligands. Intense methylation was found periphyton, while it remained low sediments plants' periphyton. Demethylation varied between...
Methylmercury, biomagnifying through food chains, is highly toxic for aquatic life. Its production and degradation are largely driven by microbial transformations; however, diversity metabolic activity of mercury transformers, resulting in methylmercury concentrations environments, remain poorly understood. Microbial mats thick biofilms where oxic anoxic metabolisms cooccur, providing opportunities to investigate the complexity transformations over contrasted redox conditions. Here, we...
The activity of 19 antibiotics and four antiseptics and/or disinfectants was studied against 138 non-redundant strains Aeromonas spp. (104 caviae, 22 sobria 12 hydrophila) isolated from two European rivers. Antibiotic resistance frequencies were: nalidixic acid, 59%; tetracycline, 14%; fosfomycin, 8%; tobramycin cotrimoxazole, 7%; cefotaxime, 4%; chloramphenicol, 2%; gentamicin, 1%. Most the acid-resistant were susceptible to fluoroquinolones (54–98%). rates varied according source strains....
Coastal and estuarine ecosystems are highly susceptible to crude oil pollution. Therefore, in order examine the resilience of benthic phototrophs that pivotal coastal ecosystem functioning, we simulated an spill tidal mesocosms consisting intact sediment cores from a mudflat at mouth Colne Estuary, UK. At day 21, fluorescence imaging revealed bloom cyanobacteria on surface oiled cores, upper 1.5 cm thick had 7.2 times more cyanobacterial 1.7 diatom rRNA sequences when treated with oil....
A 3-year survey on sulfate-reducing bacteria (SRB) was conducted in the waters of arsenic-rich acid mine drainage (AMD) located at Carnoulès (France) to determine influence environmental parameters their community structure. The source (S5 station) exhibited most extreme conditions with pH lowering ~1.2; iron, sulfate, and arsenic concentrations reaching 6843, 29 593, 638 mg L−1, respectively. were less downstream stations S1 (pH ~3.7; 1114, 4207, 167 respectively) COWG ~3.4; 854, 3134, 110...
Mercury (Hg) methylation genes (hgcAB) mediate the formation of toxic methylmercury and have been identified from diverse environments, including freshwater marine ecosystems, Arctic permafrost, forest paddy soils, coal-ash amended sediments, chlor-alkali plants discharges geothermal springs. Here we present first attempt at a standardized protocol for detection, identification quantification hgc metagenomes. Our Hg-cycling microorganisms in aquatic terrestrial ecosystems (Hg-MATE) database,...
form a highly diverse and widespread superphylum of uncultured microorganisms representing third the global microbial diversity. Most our knowledge on
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...
Two bacterial consortia (C55 and C33), obtained from an industrial residue contaminated with hexavalent chromium (Cr(VI)), were used to study the behavior of their mixture for depleting this ion in liquid media. In absence Cr(VI), C55 showed a greater growth rate than C33, while latter exhibited biofilm formation. presence ion, resistance up 800 mg·L −1 ability diminish 400 Cr(VI) medium, these concentrations 200 , respectively. Bacterial synergism between was evaluated using different...
ABSTRACT Most Aeromonas strains isolated from two European rivers were previously found to be resistant nalidixic acid. In order elucidate the mechanism of this resistance, 20 caviae ( n = 10), A. hydrophila 5), and sobria 5) complexes, including 3 reference 17 environmental isolates, investigated. Fragments gyrA , gyrB parC parE genes encompassing quinolone resistance-determining regions (QRDRs) amplified by PCR sequenced. Results obtained for six sensitive showed that GyrA, GyrB, ParC,...
The aim of this work was to characterize bacterial ring-hydroxylating dioxygenase (RHD) diversity in a pristine microbial mat and follow their changes response heavy fuel oil contamination. In order describe the RHDs diversity, new degenerate primers were designed nested-PCR approach developed gain sensitivity wider diversity. RHD artificially contaminated mats maintained microcosms chronically analysed by clone libraries terminal restriction fragment length polymorphism (T-RFLP) at genomic...
New primers were designed for the amplification of dsrAB genes by nested PCR to investigate diversity sulfate-reducing prokaryotes (SRP) in environments with low bacterial cell density. The success determination SRP was estimated terminal-restriction fragment length polymorphism analysis Reigous, a small creek at an inactive mine (Carnoulès, France), which constitutes extreme acidic arsenic-rich environment. Nested limits evaluated dsrAB-rich sediments, and this technique compared direct...
Journal Article Hexavalent chromium reduction by bacterial consortia and pure strains from an alkaline industrial effluent Get access H.A. Piñón‐Castillo, Piñón‐Castillo Departamento de Biología, División Ciencias Naturales y Exactas, Universidad Guanajuato, Gto., Mexico Search for other works this author on: Oxford Academic Google Scholar E.M.S. Brito, Brito Ingeniería Civil, Ingenierías, M. Goñi‐Urriza, Goñi‐Urriza Equipe Environnement et Microbiologie, IPREM UMR CNRS5254, Bâtiment IBEAS,...