Biotransformation of mercury by bacteria isolated from a river collecting cinnabar mine waters |
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| Authors: | Franco Baldi Marco Filippelli Gregory J Olson |
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| Institution: | (1) Dipartimento di Biologia Ambientale, Universita di Siena, Siena, Italy;(2) Laboratorio Chimico d'Igiene e Profilassi, La Spezia, Italy;(3) Polymers Division, National Institute of Standards and Technology, Gaithersburg, Maryland, USA |
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| Abstract: | One hundred six strains of aerobic bacteria were isolated from the Fiora River which drains an area of cinnabar deposits in southern Tuscany, Italy. Thirty-seven of the strains grew on an agar medium containing 10 g/ml Hg (as HgCl2) with all of these strains producing elemental mercury. Seven of the 37 strains also degraded methylmercury. None of 106 sensitive and resistant strains produced detectable monomethylmercury although 15 strains produced a benzene-soluble mercury species. Two strains of alkylmercury (methyl-, ethyl- and phenylmercury) degrading bacteria were tested for the ability to degrade several other analogous organometals and organic compounds, but no activity was detected toward these compounds. Mercury methylation is not a mechanism of Hg resistance in aerobic bacteria from this environment. Growth of bacteria on the agar medium containing 10g/ml HgCl2 was diagnostic for Hg detoxification based on reduction. |
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