Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/121495
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Type: | Journal article |
Title: | Biogeochemical gold cycling selects metal-resistant bacteria that promote gold particle transformation |
Author: | Sanyal, S. Shuster, J. Reith, F. |
Citation: | FEMS Microbiology Ecology, 2019; 95(7):fiz078-1-fiz078-16 |
Publisher: | Oxford University Press |
Issue Date: | 2019 |
ISSN: | 0168-6496 1574-6941 |
Statement of Responsibility: | Santonu Kumar Sanyal, Jeremiah Shuster, Frank Reith |
Abstract: | Bacteria catalyze the dissolution and re-precipitation of gold, thereby driving the biogeochemical cycle of gold. Dissolution of gold/silver and re-precipitation of gold transforms gold particles by increasing gold purity. While soluble gold complexes are highly cytotoxic, little is known about how gold cycling affects bacterial communities residing on gold particles. Micro-analysis of gold particles obtained from Western Australia revealed porous textures and aggregates of pure gold nanoparticles, attributable to gold dissolution and re-precipitation, respectively. By interpreting structure and chemistry of particles, the kinetics of gold biogeochemical cycling at the site was estimated to be 1.60 × 10−9 M year−1. Bacterial communities residing on particles were composed of Proteobacteria (42.5%), Bacteroidetes (20.1%), Acidobacteria (19.1%), Firmicutes (8.2%), Actinobacteria (3.7%), and Verrucomicrobia (3.6%). A bacterial enrichment culture obtained from particles contained a similar composition. Exposure of enrichments to increasing concentrations of soluble gold decreased community diversity and selected for metal-resistant bacteria. Lower gold concentrations, which corresponded well with the concentration from the kinetic rate, provided a selective pressure for the selection of metal-resistant organisms while retaining the overall diversity. In conclusion, biogeochemical gold cycling directly influences bacterial communities on gold particles, thereby contributing to a continuum of particle transformation. |
Keywords: | Bacteria; biofilms; gold; geomicrobiology; placer; bio-mineralisation |
Rights: | © FEMS 2019. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model) |
DOI: | 10.1093/femsec/fiz078 |
Grant ID: | http://purl.org/au-research/grants/arc/FT150100250 |
Published version: | http://dx.doi.org/10.1093/femsec/fiz078 |
Appears in Collections: | Aurora harvest 4 Microbiology and Immunology publications |
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hdl_121495.pdf | Accepted version | 1.23 MB | Adobe PDF | View/Open |
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