Inhibitory effects of Skeletonema costatum on mercury methylation by Geobacter sulfurreducens PCA

Mercury Reduction, Uptake, and Species Transformation by Freshwater Alga Chlorella vulgaris under Sunlit and Dark Conditions

“…Studies have also shown that Hg­(II) complexes with thiols on DOM or AOM could be converted to meta-cinnabar (β-HgS) under light exposure, thereby affecting its bioavailability. , Microbial conversion of Hg­(II) to MeHg was reported to be significantly inhibited in the presence of algal cells due to decreased bioavailable Hg­(II) for bacterial methylators. , Photochemical reactions between Hg­(II) and DOM were also found to decrease the bioavailability and methylation of Hg­(II) due to the formation of β-HgS. , However, under anaerobic conditions, DOM may also enhance the production of MeHg through stimulating the growth of Hg methylators , as well as changing Hg speciation. − However, currently little information is available regarding the changes of Hg­(II) speciation in the presence of algal cells and their exudates under either solar or dark conditions. No studies have examined Hg­(II) distributions associated with algal cells and species transformations, which may affect the bioavailability and trophic transfer of Hg­(II).…”

“…20,21 Microbial conversion of Hg(II) to MeHg was reported to be significantly inhibited in the presence of algal cells due to decreased bioavailable Hg(II) for bacterial methylators. 25,26 Photochemical reactions between Hg(II) and DOM were also found to decrease the bioavailability and methylation of Hg(II) due to the formation of β-HgS. 27,28 However, under anaerobic conditions, DOM may also enhance the production of MeHg through stimulating the growth of Hg methylators 29,30 as well as changing Hg speciation.…”

Using Mercury Stable Isotopes to Quantify Directional Soil–Atmosphere Hg(0) Exchanges in Rice Paddy Ecosystems: Implications for Hg(0) Emissions to the Atmosphere from Land Surfaces

“…The bacterial strain selected for this study was Geobacter sulfurreducens (G. sulfurreducens) PCA, which is a ubiquitous iron-reducing bacterium found in various ecosystems, including rice paddies. , We have previously detected a high abundance of G. sulfurreducens PCA (accounting for 0.3% of the total bacteria population), which is the dominant Hg-reducing microorganism in the investigated paddy soils . Therefore, it is reasonable to use G.…”