A microbial driver of clay mineral weathering and bioavailable Fe source under low-temperature conditions
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Title
- A microbial driver of clay mineral weathering and bioavailable Fe source under low-temperature conditions
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Author(s)
- Jung, Jaewoo; Chung, Hyun Young; Ko, Youngtak; Moon, Inkyeong; Suh, Yeon Jee; Kim, Kitae
- KIOST Author(s)
- Jung, Jaewoo(정재우); Ko, Young Tak(고영탁); Moon, Inkyeong(문인경); Suh, Yeon Jee(서연지)
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Alternative Author(s)
- 정재우; 고영탁; 문인경; 서연지
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Publication Year
- 2022-08
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Abstract
- Biotic and abiotic Fe(III) reduction of clay minerals (illite IMt-1) under low-temperature (0 and 4°C, pH 6) was studied to evaluate the effects of bioalteration on soil properties including clay structure and elemental composition. The extent of Fe reduction in bioreduced samples (∼3.8 % at 4°C and ∼3.1 % at 0°C) was lower than abiotic reduction (∼7.6 %) using dithionite as a strong reductant. However, variations in the illite crystallinity value of bioreduced samples (°Δ2θ = 0.580–0.625) were greater than those of abiotic reduced samples (°Δ2θ = 0.580–0.601), indicating that modification of crystal structure is unlikely to have occurred in abiotic reduction. Moreover, precipitation of secondary-phase minerals such as vivianite [Fe2+3(PO4)2⋅8H2O] and nano-sized biogenic silica were shown as evidence of reductive dissolution of Fe-bearing minerals that is observed only in a bioreduced setting. Our observation of a previously undescribed microbe–mineral interaction at low-temperature suggests a significant implication for the microbially mediated mineral alteration in Arctic permafrost, deep sea sediments, and glaciated systems resulting in the release of bioavailable Fe with an impact on low-temperature biogeochemical cycles.
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ISSN
- 1664-302X
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URI
- https://sciwatch.kiost.ac.kr/handle/2020.kiost/43148
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DOI
- 10.3389/fmicb.2022.980078
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Bibliographic Citation
- Frontiers in Microbiology, v.13, 2022
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Publisher
- Frontiers Media S.A.
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Keywords
- illite (IMt-1); microbe-mineral interaction; psychrophilic bacteria; biomineralization; Fe sources
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Type
- Article
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Language
- English
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Document Type
- Article
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