期刊
MINERALS
卷 3, 期 4, 页码 367-394出版社
MDPI AG
DOI: 10.3390/min3040367
关键词
gold; bacteria; cycling; biomineralization; review; exploration; bioindicator; biosensor
资金
- Australian Research Council [LP100200102]
- Deutsche Forschungsgemeinschaft (DFG)
- Commonwealth Scientific and Industrial Research Organization
- University of Adelaide
- South Australian Museum
- Newmont Mining Corp.
- Barrick Gold Corp.
- South Australian Department for Manufacturing, Innovation, Trade, Resources and Energy (DMITRE)
- Centre for Tectonics, Resources and Exploration
- Institute for Mineral and Energy Resources
- Australian Research Council [LP100200102] Funding Source: Australian Research Council
Microbial communities mediating gold cycling occur on gold grains from (sub)-tropical, (semi)-arid, temperate and subarctic environments. The majority of identified species comprising these biofilms are beta-Proteobacteria. Some bacteria, e.g., Cupriavidus metallidurans, Delftia acidovorans and Salmonella typhimurium, have developed biochemical responses to deal with highly toxic gold complexes. These include gold specific sensing and efflux, co-utilization of resistance mechanisms for other metals, and excretion of gold-complex-reducing siderophores that ultimately catalyze the biomineralization of nano-particulate, spheroidal and/or bacteriomorphic gold. In turn, the toxicity of gold complexes fosters the development of specialized biofilms on gold grains, and hence the cycling of gold in surface environments. This was not reported on isoferroplatinum grains under most near-surface environments, due to the lower toxicity of mobile platinum complexes. The discovery of gold-specific microbial responses can now drive the development of geobiological exploration tools, e.g., gold bioindicators and biosensors. Bioindicators employ genetic markers from soils and groundwaters to provide information about gold mineralization processes, while biosensors will allow in-field analyses of gold concentrations in complex sampling media.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据