Biomineralization of Gold: Biofilms on Bacterioform Gold

  title={Biomineralization of Gold: Biofilms on Bacterioform Gold},
  author={F. Reith and S. Rogers and D. Mcphail and D. Webb},
  pages={233 - 236}
Bacterial biofilms are associated with secondary gold grains from two sites in Australia. 16S ribosomal DNA clones of the genus Ralstonia that bear 99% similarity to the bacterium Ralstonia metallidurans—shown to precipitate gold from aqueous gold(III) tetrachloride—were present on all DNA-positive gold grains but were not detected in the surrounding soils. These results provide evidence for the bacterial contribution to the authigenic formation of secondary bacterioform gold grains and nuggets… Expand
Bacterial biofilms on gold grains-implications for geomicrobial transformations of gold.
A range of resident Proteobacteria have developed Au-specific biochemical responses to deal with Au-toxicity and reductively precipitate mobile Au-complexes, which leads to the biomineralization of secondary Au and drives the environmental cycle of Au. Expand
Gold biomineralization by a metallophore from a gold-associated microbe.
It is reported that the gold resident bacterium Delftia acidovorans produces a secondary metabolite that protects from soluble gold through the generation of solid gold forms. Expand
The Biogeochemistry of Gold
The biosphere catalyzes a variety of biogeochemical reactions that can transform gold. Microbial weathering contributes to the mobilization of gold by releasing elemental gold trapped within mineralsExpand
Gold particle geomicrobiology: Using viable bacteria as a model for understanding microbe–mineral interactions
Abstract The biogeochemical cycling of gold has been proposed from studies focusing on gold particle morphology, surface textures and associated bacteria living on the surface of gold particles.Expand
Geobiological Cycling of Gold: From Fundamental Process Understanding to Exploration Solutions
The discovery of gold-specific microbial responses can now drive the development of geobiological exploration tools, e.g., gold bioindicators and biosensors, which will allow in-field analyses of gold concentrations in complex sampling media. Expand
The in-vitro “growth” of gold grains
Gold colloids, octahedral platelets, and foils, directly and indirectly formed from the reduction of soluble Au(I) thiosulfate and Au(III) chloride complexes by iron-oxidizing bacteria,Expand
Gold Biomineralization on Bacterial Biofilms for Leaching of Au3+ Damages Eukaryotic Cells
The present findings indicate that metal biomineralization in bacterial biofilms for leaching of heavy metal ions is hazardous to eukaryotic cells and even human health. Expand
The geomicrobiology of gold
Reductive precipitation of these complexes may improve survival rates of bacterial populations that are capable of detoxifying the immediate cell environment by detecting, excreting and reducing gold complexes, possibly using P-type ATPase efflux pumps as well as membrane vesicles. Expand
Progressive biogeochemical transformation of placer gold particles drives compositional changes in associated biofilm communities.
It is hypothesized that Au-dissolution and re-concentration (precipitation) place selective pressures on associated microbial communities, leading to compositional changes and subsequent Au-particle transformation, which exerted a strong influence on biofilm community composition. Expand
Biomineralization of gold in biofilms of Cupriavidus metallidurans.
This study demonstrates the importance of C. metallidurans biofilms for the detoxification of Au-complexes and demonstrates a central role for bacterial biomineralization in the formation of highly pure Au in surface environments. Expand


Artifacts resembling budding bacteria produced in placer-gold amalgams by nitric acid leaching
Microscopic filiform morphologies in gold which are indistinguishable from forms originally interpreted as bacterial in origin were produced in the laboratory by treating amalgams made from naturalExpand
Pseudomonas aeruginosa biofilms react with and precipitate toxic soluble gold.
The interaction between biofilms of Pseudomonas aeruginosa PAO1 and 0.01-5 mM gold chloride was investigated and results suggest that the biomineralization of gold is impacted by biofilm structure. Expand
Accumulation of gold by microorganisms
Thirty species of microorganisms (8 bacteria, 9 actinomycetes, 8 fungi and 5 yeasts) were screened for maximal gold accumulation. Extremely high abilities to accumulate gold from a solutionExpand
Reductive Precipitation of Gold by Dissimilatory Fe(III)-Reducing Bacteria andArchaea
ABSTRACT Studies with a diversity of hyperthermophilic and mesophilic dissimilatory Fe(III)-reducing Bacteria andArchaea demonstrated that some of these organisms are capable of precipitating gold byExpand
Effect of resident microbiota on the solubilization of gold in soil from the Tomakin Park Gold Mine, New South Wales, Australia
Abstract The processes influencing the solubilization and observed mobility of Au in soil were studied using a combination of geochemical and microbiological techniques. In this study, we demonstrateExpand
The effect of thiosulfate-oxidizing bacteria on the stability of the gold-thiosulfate complex
An Acidithiobacillus thiooxidans spp., isolated from the Driefontein Consolidated Gold Mine, Witwatersrand Basin, Republic of South Africa was able to precipitate gold from Au(S2O3)23− in theExpand
Precipitation of Silver-Thiosulfate Complex and Immobilization of Silver by Cupriavidus metallidurans CH34
The ability of Cupriavidus metallidurans CH34 to resist silver is described here and it is shown that this resistance seems to be carried by pMOL30. Expand
Ralstonia metallidurans, a bacterium specifically adapted to toxic metals: towards a catalogue of metal-responsive genes.
A first inventory of metal resistance genes and operons across R. metallidurans suggests that metal-resistant Ralstonia, through evolution, are particularly well adapted to the harsh environments typically created by extreme anthropogenic situations or biotopes. Expand
[The role of membrane processes in Au(III) and Au(0) accumulation by bacteria].
The role of structural and functional factors in the processes of the bacterial cell interaction with colloid Au (0) and ionic Au (III) states has been investigated. It is shown that the bacterialExpand
Evolution of nanoporosity in dealloying
It is demonstrated that nanoporosity in metals is due to an intrinsic dynamical pattern formation process, and that chemically tailored nanoporous gold made by dealloying Ag-Au should be suitable for sensor applications, particularly in a biomaterials context. Expand