Methanobactin‐Promoted Dissolution of Cu‐Substituted Borosilicate Glass

Methanobactin‐Promoted Dissolution of Cu‐Substituted Borosilicate Glass

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  • November 20, 2018
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Mineral weathering plays an important role in the global cycling of carbon and metals and there is an increasing realization that subsurface microbial activity may be a key factor controlling specific biogeochemical reactions and their rates. Methanobactin (mb) is an extracellular copper‐binding compound excreted by methanotrophs to acquire copper for the regulation of methane oxidation. Bioavailable Cu regulates the expression and activity of pMMO vs. sMMO (particulate vs. soluble methane monooxygenase, respectively), key enzymes responsible for bacterial methane oxidation. In this study, we investigate the effect of mb on the dissolution of Cu‐substituted borosilicate glass at low temperature and near neutral pH conditions, using batch dissolution experiments. Methanobactin promotes the dissolution of Cu‐substituted glasses at rates faster than control experiments. Glasses with lower concentrations of …

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