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Bray MS, Wu J, Reed BC, Kretz CB, Belli KM, Simister RL, Henny C, Stewart FJ, DiChristina TJ, Brandes JA, Fowle DA, Crowe SA, Glass JB. Shifting microbial communities sustain multiyear iron reduction and methanogenesis in ferruginous sediment incubations. GEOBIOLOGY 2017; 15:678-689. [PMID: 28419718 PMCID: PMC7780294 DOI: 10.1111/gbi.12239] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Accepted: 03/17/2017] [Indexed: 05/16/2023]
Abstract
Reactive Fe(III) minerals can influence methane (CH4 ) emissions by inhibiting microbial methanogenesis or by stimulating anaerobic CH4 oxidation. The balance between Fe(III) reduction, methanogenesis, and CH4 oxidation in ferruginous Archean and Paleoproterozoic oceans would have controlled CH4 fluxes to the atmosphere, thereby regulating the capacity for CH4 to warm the early Earth under the Faint Young Sun. We studied CH4 and Fe cycling in anoxic incubations of ferruginous sediment from the ancient ocean analogue Lake Matano, Indonesia, over three successive transfers (500 days in total). Iron reduction, methanogenesis, CH4 oxidation, and microbial taxonomy were monitored in treatments amended with ferrihydrite or goethite. After three dilutions, Fe(III) reduction persisted only in bottles with ferrihydrite. Enhanced CH4 production was observed in the presence of goethite, highlighting the potential for reactive Fe(III) oxides to inhibit methanogenesis. Supplementing the media with hydrogen, nickel and selenium did not stimulate methanogenesis. There was limited evidence for Fe(III)-dependent CH4 oxidation, although some incubations displayed CH4 -stimulated Fe(III) reduction. 16S rRNA profiles continuously changed over the course of enrichment, with ultimate dominance of unclassified members of the order Desulfuromonadales in all treatments. Microbial diversity decreased markedly over the course of incubation, with subtle differences between ferrihydrite and goethite amendments. These results suggest that Fe(III) oxide mineralogy and availability of electron donors could have led to spatial separation of Fe(III)-reducing and methanogenic microbial communities in ferruginous marine sediments, potentially explaining the persistence of CH4 as a greenhouse gas throughout the first half of Earth history.
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Affiliation(s)
- M. S. Bray
- School of Biology, Georgia Institute of Technology, Atlanta, GA, USA
| | - J. Wu
- School of Biology, Georgia Institute of Technology, Atlanta, GA, USA
| | - B. C. Reed
- School of Biology, Georgia Institute of Technology, Atlanta, GA, USA
| | - C. B. Kretz
- School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, USA
| | - K. M. Belli
- School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, USA
| | - R. L. Simister
- Departments of Microbiology & Immunology and Earth, Ocean, & Atmospheric Sciences, University of British Columbia, Vancouver, BC, Canada
| | - C. Henny
- Research Center for Limnology, Indonesian Institute of Sciences, Cibinong, Indonesia
| | - F. J. Stewart
- School of Biology, Georgia Institute of Technology, Atlanta, GA, USA
- School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, USA
| | - T. J. DiChristina
- School of Biology, Georgia Institute of Technology, Atlanta, GA, USA
- School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, USA
| | - J. A. Brandes
- Skidaway Institute of Oceanography, Savannah, GA, USA
| | - D. A. Fowle
- Department of Geology, University of Kansas, Lawrence, KS, USA
| | - S. A. Crowe
- Departments of Microbiology & Immunology and Earth, Ocean, & Atmospheric Sciences, University of British Columbia, Vancouver, BC, Canada
| | - J. B. Glass
- School of Biology, Georgia Institute of Technology, Atlanta, GA, USA
- School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, USA
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52
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Anaerobic oxidation of methane coupled with extracellular electron transfer to electrodes. Sci Rep 2017; 7:5099. [PMID: 28698657 PMCID: PMC5506047 DOI: 10.1038/s41598-017-05180-9] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Accepted: 05/24/2017] [Indexed: 12/22/2022] Open
Abstract
Anaerobic oxidation of methane (AOM) is an important process for understanding the global flux of methane and its relation to the global carbon cycle. Although AOM is known to be coupled to reductions of sulfate, nitrite, and nitrate, evidence that AOM is coupled with extracellular electron transfer (EET) to conductive solids is relatively insufficient. Here, we demonstrate EET-dependent AOM in a biofilm anode dominated by Geobacter spp. and Methanobacterium spp. using carbon-fiber electrodes as the terminal electron sink. The steady-state current density was kept at 11.0 ± 1.3 mA/m2 in a microbial electrochemical cell, and isotopic experiments supported AOM-EET to the anode. Fluorescence in situ hybridization images and metagenome results suggest that Methanobacterium spp. may work synergistically with Geobacter spp. to allow AOM, likely by employing intermediate (formate or H2)-dependent inter-species electron transport. Since metal oxides are widely present in sedimentary and terrestrial environments, an AOM-EET niche would have implications for minimizing the net global emissions of methane.
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54
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Zhang YK, Liu XH, Liu XW, Zha YF, Xu XL, Ren ZG, Jiang HC, Wang HC. Research advances in deriving renewable energy from biomass in wastewater treatment plants. RSC Adv 2016. [DOI: 10.1039/c6ra06868e] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Anaerobic digestion (AD) can be used to derive renewable energy from biomass in wastewater treatment plants, and the produced biogas represents a valuable end-product that can greatly offset operation costs.
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Affiliation(s)
- Yuan-kai Zhang
- School of Environment & Natural Resource
- Renmin University of China
- Beijing 100872
- China
| | - Xiu-hong Liu
- School of Environment & Natural Resource
- Renmin University of China
- Beijing 100872
- China
| | - Xiao-wei Liu
- School of Environment & Natural Resource
- Renmin University of China
- Beijing 100872
- China
| | - Yi-fei Zha
- School of Environment & Natural Resource
- Renmin University of China
- Beijing 100872
- China
| | - Xiang-long Xu
- School of Environment & Natural Resource
- Renmin University of China
- Beijing 100872
- China
| | - Zheng-guang Ren
- School of Environment & Natural Resource
- Renmin University of China
- Beijing 100872
- China
| | - Hang-cheng Jiang
- School of Environment & Natural Resource
- Renmin University of China
- Beijing 100872
- China
| | - Hong-chen Wang
- School of Environment & Natural Resource
- Renmin University of China
- Beijing 100872
- China
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