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Wang H, Byrne JM, Liu P, Liu J, Dong X, Lu Y. Redox cycling of Fe(II) and Fe(III) in magnetite accelerates aceticlastic methanogenesis by Methanosarcina mazei. ENVIRONMENTAL MICROBIOLOGY REPORTS 2020; 12:97-109. [PMID: 31876088 DOI: 10.1111/1758-2229.12819] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2019] [Accepted: 12/20/2019] [Indexed: 06/10/2023]
Abstract
It has been recently shown that magnetite nanoparticles (nanoFe3 O4 ) can facilitate methanogenic syntrophy but the effect of magnetite on methanogenesis alone remains elusive. Here we show that aceticlastic methanogenesis by Methanosarcina mazei is accelerated by magnetite and is correlated with the redox cycling of structural Fe(II) and Fe(III) in the mineral. An enrichment and its closest pure culture relative, Ms. mazei zm-15, both obtained from a natural wetland of the Tibetan plateau were tested in this experiment. The Fe(II) to Fe(III) ratios in magnetite, as measured by multiple approaches, show an initial increase in both the methanogenic cultures and the blank preparations containing no microbes. The Fe(II)/Fe(III) ratio then displays a distinct decline followed by an increase towards the end of incubation only in the enrichment and pure culture cultivations. This redox cycling of magnetite is in accordance with the stimulation of aceticlastic methanogenesis. Microscopic observation reveals the precipitation of nanoFe3 O4 on methanogen cell surface. The genomic analysis predicts that in addition to electron transfer components essential for aceticlastic methanogenesis, Ms. mazei zm-15 contains an outer-surface multiheme c-type cytochrome (MHC) and a few function-unknown surface proteins that harbour monoheme motif. We hypothesize that the redox cycling of nanoFe3 O4 delivers a positive influence via the MHC to the membrane electron transfer chain and hence promote the aceticlastic methanogenesis.
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Affiliation(s)
- Hui Wang
- College of Urban and Environmental Sciences, Peking University, Beijing, 100871, China
| | - James M Byrne
- Geomicrobiology, Center for Applied Geosciences, University of Tuebingen, Sigwartstrasse, 10, 70726, Tuebingen, Germany
| | - Pengfei Liu
- Department of Soil and Crop Sciences, Colorado State University, 80521, Fort Collins, CO, USA
| | - Juan Liu
- College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China
| | - Xiuzhu Dong
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Yahai Lu
- College of Urban and Environmental Sciences, Peking University, Beijing, 100871, China
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Brotton SJ, Kaiser RI. Spectroscopic Study on the Polymer Condensates Formed via Pyrolysis of Levitated Droplets of Dicyanamide-Containing Ionic Liquids. J Phys Chem A 2019; 123:1153-1167. [DOI: 10.1021/acs.jpca.8b08993] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Stephen J. Brotton
- Department of Chemistry, University of Hawaii at Manoa, Honolulu, Hawaii 96822, United States
| | - Ralf I. Kaiser
- Department of Chemistry, University of Hawaii at Manoa, Honolulu, Hawaii 96822, United States
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Electrostatic potential and valence modulation in La 0.7Sr 0.3MnO 3 thin films. Sci Rep 2018; 8:14313. [PMID: 30254275 PMCID: PMC6156561 DOI: 10.1038/s41598-018-32701-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Accepted: 09/13/2018] [Indexed: 11/13/2022] Open
Abstract
The Mn valence in thin film La0.7Sr0.3MnO3 was studied as a function of film thickness in the range of 1–16 unit cells with a combination of non-destructive bulk and surface sensitive X-ray absorption spectroscopy techniques. Using a layer-by-layer valence model, it was found that while the bulk averaged valence hovers around its expected value of 3.3, a significant deviation occurs within several unit cells of the surface and interface. These results were supported by first principles calculations. The surface valence increases to up to Mn3.7+, whereas the interface valence reduces down to Mn2.5+. The change in valence from the expected bulk value is consistent with charge redistribution due to the polar discontinuity at the film-substrate interface. The comparison with theory employed here illustrates how this layer-by-layer valence evolves with film thickness and allows for a deeper understanding of the microscopic mechanisms at play in this effect. These results offer insight on how the two-dimensional electron gas is created in thin film oxide alloys and how the magnetic ordering is reduced with dimensionality.
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Suga H, Kikuchi S, Takeichi Y, Miyamoto C, Miyahara M, Mitsunobu S, Ohigashi T, Mase K, Ono K, Takahashi Y. Spatially Resolved Distribution of Fe Species around Microbes at the Submicron Scale in Natural Bacteriogenic Iron Oxides. Microbes Environ 2017; 32:283-287. [PMID: 28781344 PMCID: PMC5606699 DOI: 10.1264/jsme2.me17009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2017] [Accepted: 05/24/2017] [Indexed: 11/29/2022] Open
Abstract
Natural bacteriogenic iron oxides (BIOS) were investigated using local-analyzable synchrotron-based scanning transmission X-ray microscopy (STXM) with a submicron-scale resolution. Cell, cell sheath interface (EPS), and sheath in the BIOS were clearly depicted using C-, N-, and O- near edge X-ray absorption fine structure (NEXAFS) obtained through STXM measurements. Fe-NEXAFS obtained from different regions of BIOS indicated that the most dominant iron mineral species was ferrihydrite. Fe(II)- and/or Fe(III)-acidic polysaccharides accompanied ferrihydrite near the cell and EPS regions. Our STXM/NEXAFS analysis showed that Fe species change continuously between the cell, EPS, and sheath under several 10-nm scales.
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Affiliation(s)
- Hiroki Suga
- Department of Earth and Planetary Systems Science, Graduate School of Science (DEPSS), Hiroshima UniversityHigashi-Hiroshima, Hiroshima 739–8526Japan
| | - Sakiko Kikuchi
- Project Team for Development of New-Generation Research Protocol for Submarine Resources, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)Natsushima, Yokosuka, Kanagawa 237–0061Japan
| | - Yasuo Takeichi
- Institute of Materials Structure Science, High-Energy Accelerator Research Organization (KEK)Oho, Tsukuba, Ibaraki 305–0801Japan
- Department of Materials Structure Science, SOKENDAI (The Graduate University for Advanced Studies)1–1 Oho, Tsukuba, Ibaraki, 305–0801Japan
| | - Chihiro Miyamoto
- Department of Earth and Planetary Science, Graduate School of Science, The University of TokyoBunkyo-Ku, Tokyo 113–0033Japan
| | - Masaaki Miyahara
- Department of Earth and Planetary Systems Science, Graduate School of Science (DEPSS), Hiroshima UniversityHigashi-Hiroshima, Hiroshima 739–8526Japan
| | - Satoshi Mitsunobu
- Department of Environmental Conservation, Graduate school of Agriculture, Ehime UniversityTarumi, Matsuyama, Ehime 790–8577Japan
| | - Takuji Ohigashi
- UVSOR facility, Institute for Molecular ScienceMyodaiji, Okazaki 444–8585Japan
| | - Kazuhiko Mase
- Institute of Materials Structure Science, High-Energy Accelerator Research Organization (KEK)Oho, Tsukuba, Ibaraki 305–0801Japan
- Department of Materials Structure Science, SOKENDAI (The Graduate University for Advanced Studies)1–1 Oho, Tsukuba, Ibaraki, 305–0801Japan
| | - Kanta Ono
- Institute of Materials Structure Science, High-Energy Accelerator Research Organization (KEK)Oho, Tsukuba, Ibaraki 305–0801Japan
- Department of Materials Structure Science, SOKENDAI (The Graduate University for Advanced Studies)1–1 Oho, Tsukuba, Ibaraki, 305–0801Japan
| | - Yoshio Takahashi
- Department of Earth and Planetary Systems Science, Graduate School of Science (DEPSS), Hiroshima UniversityHigashi-Hiroshima, Hiroshima 739–8526Japan
- Institute of Materials Structure Science, High-Energy Accelerator Research Organization (KEK)Oho, Tsukuba, Ibaraki 305–0801Japan
- Department of Earth and Planetary Science, Graduate School of Science, The University of TokyoBunkyo-Ku, Tokyo 113–0033Japan
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Olcott Marshall A, Marshall CP. Field-based Raman spectroscopic analyses of an Ordovician stromatolite. ASTROBIOLOGY 2013; 13:814-20. [PMID: 24015783 DOI: 10.1089/ast.2013.1026] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Raman spectrometers are being miniaturized for future life-detection missions on Mars. Field-portable Raman spectrometers, which have similar spectral parameters to the instruments being developed for Mars rovers, have been used to examine extant biosignatures, but they have not yet been used to examine ancient biosignatures. Here, a portable Raman spectrometer was used to analyze an Ordovician stromatolite at the outcrop, revealing both its mineralogy and the presence of sp² carbonaceous material. As stromatolites are often used as proof of the presence of life in Archean rocks and are searched for on Mars, the ability to analyze them in the field with no sample preparation has important ramifications for future Mars missions. However, these results also reveal that a 785 nm excitation source, rather than the 532 nm excitation source planned for future missions, might be a better choice in the search for fossil biosignatures.
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Byrne JM, Coker VS, Moise S, Wincott PL, Vaughan DJ, Tuna F, Arenholz E, van der Laan G, Pattrick RAD, Lloyd JR, Telling ND. Controlled cobalt doping in biogenic magnetite nanoparticles. J R Soc Interface 2013; 10:20130134. [PMID: 23594814 PMCID: PMC3645421 DOI: 10.1098/rsif.2013.0134] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2013] [Accepted: 03/25/2013] [Indexed: 12/15/2022] Open
Abstract
Cobalt-doped magnetite (CoxFe3 -xO4) nanoparticles have been produced through the microbial reduction of cobalt-iron oxyhydroxide by the bacterium Geobacter sulfurreducens. The materials produced, as measured by superconducting quantum interference device magnetometry, X-ray magnetic circular dichroism, Mössbauer spectroscopy, etc., show dramatic increases in coercivity with increasing cobalt content without a major decrease in overall saturation magnetization. Structural and magnetization analyses reveal a reduction in particle size to less than 4 nm at the highest Co content, combined with an increase in the effective anisotropy of the magnetic nanoparticles. The potential use of these biogenic nanoparticles in aqueous suspensions for magnetic hyperthermia applications is demonstrated. Further analysis of the distribution of cations within the ferrite spinel indicates that the cobalt is predominantly incorporated in octahedral coordination, achieved by the substitution of Fe(2+) site with Co(2+), with up to 17 per cent Co substituted into tetrahedral sites.
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Affiliation(s)
- J M Byrne
- School of Earth, Atmospheric and Environmental Sciences, Williamson Research Centre for Molecular Environmental Science, University of Manchester, Manchester, UK.
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