13 Result(s)
within
Emmanuel Tessier
English
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Article
Molybdate inhibits mercury methylation capacity of Pseudodesulfovibrio hydrargyri BerOc1 regardless of the growth metabolism
Molybdate inhibits sulfate respiration in sulfate-reducing bacteria (SRB). It is used as an inhibitor to indirectly evaluate the role of SRB in mercury methylation in the environment. Here, the SRB Pseudodesulfov...
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Article
Open AccessUpside down sulphate dynamics in a saline inland lake
The sulphur cycle has a key role on the fate of nutrients through its several interconnected reactions. Although sulphur cycling in aquatic ecosystems has been thoroughly studied since the early 70’s, its char...
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Article
Effect of exogenous and endogenous sulfide on the production and the export of methylmercury by sulfate-reducing bacteria
Mercury (Hg) is a global pollutant of environmental and health concern; its methylated form, methylmercury (MeHg), is a potent neurotoxin. Sulfur-containing molecules play a role in MeHg production by microorg...
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Open AccessHg isotopic composition and total Hg mass fraction in NIES Certified Reference Material No. 28 Urban Aerosols
An interlaboratory study on the National Institute for Environmental Studies (NIES) certified reference material (CRM) No. 28 Urban Aerosols, collected on the filters of a central ventilating system in a build...
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Article
Cycling and atmospheric exchanges of selenium in Canadian subarctic thermokarst ponds
The levels and speciation of dissolved, particulate and gaseous Se have been measured in five thermokarst ponds in a sporadic and discontinuous permafrost region of northern Québec (Canada) during summer oxyge...
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Article
Flux model to estimate the transport of mercury species in a contaminated lagoon (Ria de Aveiro, Portugal)
The concentrations of dissolved and particulate inorganic mercury (IHg(II)) and methylmercury (MeHg) from the contaminated Laranjo Bay (main freshwater discharge from the Antuã River) were measured by species-...
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Article
Relationships between bacterial energetic metabolism, mercury methylation potential, and hgcA/hgcB gene expression in Desulfovibrio dechloroacetivorans BerOc1
The proteins encoded by the hgcA and hgcB genes are currently the only ones known to be involved in the mercury methylation by anaerobic microorganisms. However, no studies have been published to determine the re...
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Article
Mercury speciation in plankton from the Cabo Frio Bay, SE - Brazil
Mercury (Hg) is considered a global pollutant, and the scientific community has shown great concern about its toxicity as it may affect the biota of entire systems, through bioaccumulation and bioamplification...
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Comparison of Different Air–Water Gas Exchange Models to Determine Gaseous Mercury Evasion from Different European Coastal Lagoons and Estuaries
Mercury (Hg) evasional fluxes from coastal waters are an important feature of the global Hg cycling; however, they remain poorly characterized due to limitations in datasets and a lack of suitable gas exchange...
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Article
In situ experiments for element species-specific environmental reactivity of tin and mercury compounds using isotopic tracers and multiple linear regression
The fate of mercury (Hg) and tin (Sn) compounds in ecosystems is strongly determined by their alkylation/dealkylation pathways. However, the experimental determination of those transformations is still not str...
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Article
Time Course Transformations and Fate of Mercury in Aquatic Model Ecosystems
Model aquatic ecosystems have been used to study the natural mechanisms involved in the distribution and transformation of inorganic mercury (IHg) in the different compartments and its interactions with the bi...
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Article
Volatile organotin compounds (butylmethyltin) in three European estuaries (Gironde, Rhine, Scheldt)
The occurrence of volatile organometallicspecies of tin was evidenced and investigatedin three major European estuaries, such as theGironde (F), the Rhine (NL) and the Scheldt(B/NL), along with the salinity gr...
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Article
Formation and volatilisation of alkyl-iodidesand -selenides in macrotidal estuaries
The occurrence of alkylated volatile iodide andselenide species was evidenced and investigatedin water, sediments and overlying atmosphere ofthree major European estuaries, such as theGironde (F), the Rhine (N...
