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• W3006944453 abstract "Microbial reduction of Fe(III) is a key geochemical process in anoxic environments, controlling the degradation of organics and the mobility of metals and radionuclides. To further understand these processes, it is vital to develop a reliable means of capturing Fe(III)-reducing microorganisms from the field for analysis and lab-based investigations. In this study, a novel method of capturing Fe(III)-reducing bacteria using Fe(III)-coated pumice “microbe-baits” was demonstrated. The methodology involved the coating of pumice (approx. diameter 4 to 6 mm) with a bioavailable Fe(III) mineral (akaganeite), and was verified by deployment into a freshwater spring for 2 months. On retrieval, the coated pumice baits were incubated in a series of lab-based microcosms, amended with and without electron donors (lactate and acetate), and incubated at 20℃ for 8 weeks. 16S rRNA gene analysis using the Illumina MiSeq platform showed that the Fe(III)-coated pumice baits, when incubated in the presence of lactate and acetate, enriched for Deltaproteobacteria (relative abundance of 52% of the sequences detected corresponded to Geobacter species and 24% to Desulfovibrio species). In the absence of added electron donors, Betaproteobacteria were the most abundant class detected, most heavily represented by a close relative to Rhodoferax ferrireducens (15% of species detected), that most likely used organic matter sequestered from the spring waters to support Fe(III) reduction. In addition, TEM-EDS analysis of the Fe(III)-coated pumice slurries amended with electron donors revealed that a biogenic Fe(II) mineral, magnetite, was formed at the end of the incubation period. These results demonstrate that Fe(III)-coated pumice “microbe baits” can potentially help target metal-reducing bacteria for culture-dependent studies, to further our understanding of the nano-scale microbe-mineral interactions in aquifers. Potential applications for in-situ enrichment techniques are discussed." @default.
• W3006944453 created "2020-03-06" @default.
• W3006944453 creator A5014184389 @default.
• W3006944453 creator A5017660188 @default.
• W3006944453 creator A5028241795 @default.
• W3006944453 creator A5071401224 @default.
• W3006944453 date "2020-03-11" @default.
• W3006944453 modified "2023-10-16" @default.
• W3006944453 title "A Novel “Microbial Bait” Technique for Capturing Fe(III)-Reducing Bacteria" @default.
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• W3006944453 doi "https://doi.org/10.3389/fmicb.2020.00330" @default.
• W3006944453 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7078115" @default.
• W3006944453 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/32218773" @default.
• W3006944453 hasPublicationYear "2020" @default.

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