Introduction

Ehrlich, Henry L.; Newman, Dianne K.; Kappler, Andreas

doi:10.1201/b19121-2

Cited by 48 publications

(74 citation statements)

References 8 publications

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“…It has been proposed that microorganisms play a role in the generation of a diversity of minerals in natural and engineered environments (Ehrlich & Newman 2009). This bioprocess has been named biomineralization.…”

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confidence: 99%

Isolation and metagenomic characterization of bacteria associated with calcium carbonate and struvite precipitation in a pure moving bed biofilm reactor-membrane bioreactor

et al. 2015

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A bench-scale pure moving bed bioreactor-membrane bioreactor (MBBR-MBR) used for the treatment of urban wastewater was analyzed for the identification of bacterial strains with the potential capacity for calcium carbonate and struvite biomineral formation. Isolation of mineral-forming strains on calcium carbonate and struvite media revealed six major colonies with a carbonate or struvite precipitation capacity in the biofouling on the membrane surface and showed that heterotrophic bacteria with the ability to precipitate calcium carbonate and struvite constituted ~7.5% of the total platable bacteria. These belonged to the genera Lysinibacillus, Trichococcus, Comamomas and Bacillus. Pyrosequencing analysis of the microbial communities in the suspended cells and membrane biofouling showed a high degree of similarity in all the samples collected with respect to bacterial assemblage. The study of operational taxonomic units (OTUs) identified through pyrosequencing suggested that ~21% of the total bacterial community identified in the biofouling could potentially form calcium carbonate or struvite crystals in the pure MBBR-MBR system used for the treatment of urban wastewater.

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confidence: 99%

Isolation and metagenomic characterization of bacteria associated with calcium carbonate and struvite precipitation in a pure moving bed biofilm reactor-membrane bioreactor

et al. 2015

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“…Standards were selected on the criteria that they represent the most likely oxidation states and bonding partners of platinum expected in the reacted, bacterial samples. The XAS spectra for model compounds including platinum (IV)-chloride (PtCl 4 ), platinum (IV)-cyanide (K 2 Pt(CN) 6 ), platinum (II)-chloride (K 2 PtCl 4 ), platinum (II)-cyanide (K 2 Pt(CN) 4 ) and platinum (II)-tetraamine nitrate ((NH 3 ) 4 Pt(NO 3 ) 2 ) were measured in aqueous solution in transmission mode. Liquid stocks (up to 65 mM) were prepared from solid compounds without pH adjustment.…”

Section: X-ray Absorption Spectroscopy (Xas) Data Collectionmentioning

confidence: 99%

“…Some metal-tolerant bacteria in these environments are able to carve out niche existences by using the available metal and metal-containing compounds as sources of nutrition and energy [4]. Alternatively, some bacteria may invoke genetically encoded detoxification mechanisms to mitigate the effects of high metal concentrations [5].…”

Section: Introductionmentioning

confidence: 99%

Immobilisation of Platinum by Cupriavidus metallidurans

et al. 2018

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Abstract:The metal resistant bacterium Cupriavidus metallidurans CH34, challenged with aqueous platinous and platinic chloride, rapidly immobilized platinum. XANES/EXAFS analysis of these reaction systems demonstrated that platinum binding shifted from chloride to carboxyl functional groups within the bacteria. Pt(IV) was more toxic than Pt(II), presumably due to the oxidative stress imparted by the platinic form. Platinum immobilisation increased with time and with increasing concentrations of platinum. From a bacterial perspective, intracellular platinum concentrations were two to three orders of magnitude greater than the fluid phase, and became saturated at almost molar concentrations in both reaction systems. TEM revealed that C. metallidurans was also able to precipitate nm-scale colloidal platinum, primarily along the cell envelope where energy generation/electron transport occurs. Cells enriched in platinum shed outer membrane vesicles that were enriched in metallic, colloidal platinum, likely representing an important detoxification strategy. The formation of organo-platinum compounds and membrane encapsulated nanophase platinum, supports a role for bacteria in the formation and transport of platinum in natural systems, forming dispersion halos important to metal exploration.

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“…This means that minerals are often subjected to reduction-oxidation (redox) reactions that alter the chemical and physical state of the metals they contain (Ehrlich and Newman 2008). To promote cellular growth and sustain metabolic activity, all microorganisms require major and trace metal nutrients, which can be acquired from metal-bearing minerals.…”

Section: Introductionmentioning

confidence: 99%

The Geomicrobiology of Supergene Metal Deposits

Zammit

Shuster²,

Gagen³

et al. 2015

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M icrobe-catalyzed redistribution of metals in the Earth's crust can produce remarkable, and often economic, metal enrichments. These catalytic processes rely on redox transformations to produce secondary-mineral assemblages. Classic supergene systems relate to copper, where weathering is driven by microbial activity. Roll-front uranium deposits represent a similar, albeit lateral, evolution from aerobic weathering to anaerobic enrichment. Gold is generally resistant to oxidation but a remarkable biogeochemical cycle can produce secondary gold. Finally, banded iron formations, which are microbially catalysed sedimentary deposits, can be further weathered to form high-grade ore. Metals are as important to enzyme catalysts as these catalysts are to metal enrichment.

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Introduction

Cited by 48 publications

References 8 publications

Isolation and metagenomic characterization of bacteria associated with calcium carbonate and struvite precipitation in a pure moving bed biofilm reactor-membrane bioreactor

Isolation and metagenomic characterization of bacteria associated with calcium carbonate and struvite precipitation in a pure moving bed biofilm reactor-membrane bioreactor

Immobilisation of Platinum by Cupriavidus metallidurans

The Geomicrobiology of Supergene Metal Deposits

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