Natural wetland emissions of methylated trace elements

Vriens, Bas; Lenz, Markus; Charlet, Laurent; Berg, Michael; Winkel, Lenny H. E.

doi:10.1038/ncomms4035

Cited by 77 publications

(68 citation statements)

References 51 publications

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“…Microbial methylation for conversion of soluble selenium oxyanions into volatile selenium compounds has been proposed for bioremediation of selenium-contaminated agricultural drainage water and seleniferous soils (59,(129)(130)(131)(132)(133). Microbial volatilization opens perspectives for recovering selenium via the gas phase, which is thus free from cells and other metal contaminants.…”

Section: ϫmentioning

confidence: 99%

Ecology and Biotechnology of Selenium-Respiring Bacteria

Nancharaiah

2015

Microbiol Mol Biol Rev

345

232

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SUMMARY In nature, selenium is actively cycled between oxic and anoxic habitats, and this cycle plays an important role in carbon and nitrogen mineralization through bacterial anaerobic respiration. Selenium-respiring bacteria (SeRB) are found in geographically diverse, pristine or contaminated environments and play a pivotal role in the selenium cycle. Unlike its structural analogues oxygen and sulfur, the chalcogen selenium and its microbial cycling have received much less attention by the scientific community. This review focuses on microorganisms that use selenate and selenite as terminal electron acceptors, in parallel to the well-studied sulfate-reducing bacteria. It overviews the significant advancements made in recent years on the role of SeRB in the biological selenium cycle and their ecological role, phylogenetic characterization, and metabolism, as well as selenium biomineralization mechanisms and environmental biotechnological applications.

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Section: ϫmentioning

confidence: 99%

Ecology and Biotechnology of Selenium-Respiring Bacteria

Nancharaiah

2015

Microbiol Mol Biol Rev

345

232

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“…Phytoplankton uptake of Se (VI) is thought to be inhibited in seawater by high sulfate concentrations as Se (VI) uptake involves membrane sulfate transporters (Fournier et al, 2010;Winkel et al, 2015). This pathway is therefore substantially lower than Se (IV) uptake into marine algae (Price et al, 1987;Vriens et al, 2014). Thus, given the similar concentrations of Se (VI) and Se (IV) in ocean surface waters, uptake of Se (VI) should not be significant.…”

Section: Introductionmentioning

confidence: 99%

The Global Marine Selenium Cycle: Insights From Measurements and Modeling

Mason

Soerensen

DiMento

et al. 2018

Global Biogeochemical Cycles

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Anthropogenic activities have increased the selenium (Se) concentration in the biosphere, but the overall impact on the ocean has not been examined. While Se is an essential nutrient for microorganisms, there is little information on the impact of biological processes on the concentration and speciation of Se in the ocean. Additionally, other factors controlling the distribution and concentration of Se species are poorly understood. Here we present data gathered in the subtropical Pacific Ocean during a cruise in 2011, and we used these field data and the literature, as well as laboratory photochemical experiments examining the stability and degradation of inorganic Se (both Se (IV) and Se (VI)) and dimethyl selenide, to further constrain the cycling of Se in the upper ocean. We also developed a multibox model for the biosphere to examine the impact of anthropogenic emissions on the concentration and distribution of Se in the ocean. The model concurs with the field data indicating that the Se concentration has increased in the upper ocean waters over the past 30 years. Our observational studies and model results suggest that Se (VI) is taken up by phytoplankton in the surface ocean, in contrast to the results of laboratory culture experiments. In conclusion, while anthropogenic inputs have markedly increased Se in the atmosphere (42%) and net deposition to the ocean (38%) and terrestrial landscape (41%), the impact on Se in the ocean is small (3% increase in the upper ocean). This minimal response reflects its long marine residence time.

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“…Bas Vriens et al . reported an increased rate of As methylation with increasing temperatures in both surface water and air suggesting that the methylation of As is temperature dependent32. It is also reported that at high pH, the presence of organic matter and moderate moisture and temperature would favor microbial-mediated As biotransformation33.…”

Section: Discussionmentioning

confidence: 97%

Arsenic Methylation and its Relationship to Abundance and Diversity of arsM Genes in Composting Manure

Zhai

Wong

Luo

et al. 2017

Sci Rep

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Although methylation is regarded as one of the main detoxification pathways for arsenic (As), current knowledge about this process during manure composting remains limited. In this study, two pilot-scale compost piles were established to treat manure contaminated with As. An overall accumulation of methylated As occurred during 60 day-composting time. The concentration of monomethylarsonic acid (MMA) increased from 6 to 190 μg kg−1 within 15 days and decreased to 35 μg kg−1 at the end of the maturing phase; while the concentration of dimethylarsinic acid (DMA) continuously increased from 33 to 595 μg kg−1 over the composting time. The arsM gene copies increased gradually from 0.08 × 109 to 6.82 × 109 copies g−1 dry mass over time and correlated positively to the concentrations of methylated As. 16S rRNA gene sequencing and arsM clone library analysis confirmed the high abundance and diversity of arsM genes. Many of these genes were related to those from known As-methylating microbes, including Streptomyces sp., Amycolatopsis mediterranei and Sphaerobacter thermophiles. These results demonstrated that As methylation during manure composting is significant and, for the first time, established a linkage between As biomethylation and the abundance and diversity of the arsM functional genes in composting manure.

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Natural wetland emissions of methylated trace elements

Cited by 77 publications

References 51 publications

Ecology and Biotechnology of Selenium-Respiring Bacteria

Ecology and Biotechnology of Selenium-Respiring Bacteria

The Global Marine Selenium Cycle: Insights From Measurements and Modeling

Arsenic Methylation and its Relationship to Abundance and Diversity of arsM Genes in Composting Manure

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