E L E C T R O N I C S T R U C T U R E , M A G N E T I S M A N D D Y N A M I C S

S C I E N T I F I C H I G H L I G H T S

1 1 0 H I G H L I G H T S 2 0 2 1 I

Fig. 89: Mercury coordination in the Clark s grebe derived from Hg L3- edge HR-XANES. a) Spectra from the grebe tissues. b) Spectrum of the Hg tetraselenocysteine complex Hg(Sec)4 with spectra from well-crystallised and nanoparticulate HgSe (HgSeNP). The linear coordination of Hg in MeHgCys and a portion of the HgSe structure are represented in inset. Dark red, purple, yellow, grey, and light grey spheres represent Hg, Se, S, C, and H, respectively.

Fig. 90: Fraction of bioavailable to total Se against total Hg concentration in each tissue from giant petrels. The Y-axis error

bars represent the total propagation of errors from chemical analysis and HR-XANES least-squares fits.

PRINCIPAL PUBLICATIONS AND AUTHORS

Demethylation of methylmercury in bird, fish and earthworm, A. Manceau (a), J.-P. Bourdineaud (b), R.B. Oliveira (c), S.L.F. Sarrazin (c), D.P. Krabbenhoft (d), C.A. Eagles-Smith (e), J.T. Ackerman (f), A.R. Stewart (g), C. Ward-Deitrich (h), M. Estela del Castillo Busto (h), H. Goenaga-Infante (h), A. Wack (a), M. Retegan (i), B. Detlefs (i), P. Glatzel (i), P. Bustamante (j), K.L. Nagy (k), B.A. Poulin (l), Environ. Sci. Technol. 55(3), 1527-1534 (2021); https:/doi.org/10.1021/acs.est.0c04948 In Vivo formation of HgSe nanoparticles and Hg-Tetraselenolate complex from methylmercury in seabirds - implications for Hg-Se antagonism, A. Manceau (a), A.-C. Gaillot (m), P. Glatzel (i), Y. Cherel (n), P. Bustamante (j), Environ. Sci. Technol. 55(3), 1515-1526 (2021); https:/doi.org/10.1021/acs.est.0c06269 (a) Université Grenoble Alpes, CNRS, ISTerre, Grenoble (France) (b) Université de Bordeaux, Institut Européen de Chimie et Biologie, CNRS, Pessac (France) (c) Universidade Federal do Oeste Pará, LabBBEx, Pará (Brazil) (d) Upper Midwest Water Science Center, U.S. Geological Survey, Middleton, Wisconsin (USA) (e) Forest and Rangeland Ecosystem Science Center, U.S. Geological Survey, Corvallis, Oregon (USA) (f) Western Ecological Research Center, U.S. Geological Survey, Dixon, California (USA) (g) U.S. Geological Survey, Water Resources Mission Area, Menlo Park, California (USA) (h) National Measurement Institute, LGC Limited, Teddington (UK) (i) ESRF (j) Université La Rochelle, CNRS, Littoral Environnement et Sociétés, La Rochelle (France) (k) Department of Earth and Environmental Sciences, University of Illinois at Chicago (USA) (l) U.S. Geological Survey, Water Resources Mission Area, Boulder, Colorado and Department of Environmental Toxicology, University of California Davis, California (USA) (m) Université Nantes, CNRS, Institut des Matériaux Jean Rouxel, IMN, Nantes (France) (n) Centre d Etudes Biologiques de Chizé (CEBC), CNRS−La Rochelle Université, Villiers-en-Bois (France)

speciated as HgSe. This suggests that on land where, unlike in seawater, selenium is not naturally abundant

terrestrial animals could suffer from mercury toxicity more easily than previously considered. Selenium deficiency can cause neurotoxicological effects and infertility, as selenoproteins serve critical anti-oxidant functions in the brain and testes. More research is ultimately needed to probe the biochemical response of selenium deficiency as a result of mercury detoxification in animals.

REFERENCES

[1] B.A. Poulin et al., ACS Earth Space Chem. 5, 990-997 (2021). [2] A. Manceau et al., ACS Earth Space Chem. 5, 1591-1599 (2021). [3] A. Manceau et al., Environ. Sci. Technol. Lett. 8, 405-411 (2021).