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Li R, Xi B, Wang X, Li Y, Yuan Y, Tan W. Anaerobic oxidation of methane in landfill and adjacent groundwater environments: Occurrence, mechanisms, and potential applications. WATER RESEARCH 2024; 255:121498. [PMID: 38522398 DOI: 10.1016/j.watres.2024.121498] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Revised: 02/08/2024] [Accepted: 03/19/2024] [Indexed: 03/26/2024]
Abstract
Landfills remain the predominant means of solid waste management worldwide. Widespread distribution and significant stockpiles of waste in landfills make them a significant source of methane emissions, exacerbating climate change. Anaerobic oxidation of methane (AOM) has been shown to play a critical role in mitigating methane emissions on a global scale. The rich methane and electron acceptor environment in landfills provide the necessary reaction conditions for AOM, making it a potentially low-cost and effective strategy for reducing methane emissions in landfills. However, compared to other anaerobic habitats, research on AOM in landfill environments is scarce, and there is a lack of analysis on the potential application of AOM in different zones of landfills. Therefore, this review summarizes the existing knowledge on AOM and its occurrence in landfills, analyzes the possibility of AOM occurrence in different zones of landfills, discusses its potential applications, and explores the challenges and future research directions for AOM in landfill management. The identification of research gaps and future directions outlined in this review encourages further investigation and advancement in the field of AOM, paving the way for more effective waste stabilization, greenhouse gas reduction, and pollutant mitigation strategies in landfills.
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Affiliation(s)
- Renfei Li
- State Key Laboratory of Environmental Criteria and Risk Assessment, and State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing 100012, PR China; School of Environment, Tsinghua University, Beijing 100084, PR China
| | - Beidou Xi
- State Key Laboratory of Environmental Criteria and Risk Assessment, and State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing 100012, PR China; School of Environment, Tsinghua University, Beijing 100084, PR China.
| | - Xiaowei Wang
- Department of Environmental Science and Engineering, Beijing Technology and Business University, Beijing 100048, PR China
| | - Yanjiao Li
- State Key Laboratory of Environmental Criteria and Risk Assessment, and State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing 100012, PR China
| | - Ying Yuan
- State Key Laboratory of Environmental Criteria and Risk Assessment, and State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing 100012, PR China
| | - Wenbing Tan
- State Key Laboratory of Environmental Criteria and Risk Assessment, and State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing 100012, PR China
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Rõõm EI, Lauringson V, Laas A, Kangro K, Viik M, Meinson P, Cremona F, Nõges P, Nõges T. Summer greenhouse gas fluxes in different types of hemiboreal lakes. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 843:156732. [PMID: 35716743 DOI: 10.1016/j.scitotenv.2022.156732] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Revised: 06/07/2022] [Accepted: 06/12/2022] [Indexed: 06/15/2023]
Abstract
Lakes are considered important regulators of atmospheric greenhouse gases (GHG). We estimated late summer open water GHG fluxes in nine hemiboreal lakes in Estonia classified under different lake types according to the European Water Framework Directive (WFD). We also used the WFD typology to provide an improved estimate of the total GHG emission from all Estonian lakes with a gross surface area of 2204 km2 representing 45,227 km2 of hemiboreal landscapes (the territory of Estonia). The results demonstrate largely variable CO2 fluxes among the lake types with most active emissions from Alkalitrophic (Alk), Stratified Alkalitrophic (StratAlk), Dark Soft and with predominant binding in Coastal, Very Large, and Light Soft lakes. The CO2 fluxes correlated strongly with dissolved CO2 saturation (DCO2) values at the surface. Highest CH4 emissions were measured from the Coastal lake type, followed by Light Soft, StratAlk, and Alk types; Coastal, Light Soft, and StratAlk were emitting CH4 partly as bubbles. The only emitter of N2O was the Alk type. We measured weak binding of N2O in Dark Soft and Coastal lakes, while in all other studied lake types, the N2O fluxes were too small to be quantified. Diversely from the common viewpoint of lakes as net sources of both CO2 and CH4, it turns out from our results that at least in late summer, Estonian lakes are net sinks of both CO2 alone and the sum of CO2 and CH4. This is mainly caused by the predominant CO2 sink function of Lake Peipsi forming ¾ of the total lake area and showing negative net emissions even after considering the Global Warming Potential (GWP) of other GHGs. Still, by converting CH4 data into CO2 equivalents, the combined emission of all Estonian lakes (8 T C day-1) is turned strongly positive: 2720 T CO2 equivalents per day.
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Affiliation(s)
- Eva-Ingrid Rõõm
- Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 5, 51006 Tartu, Estonia; Environmental Investment Centre, Narva mnt 7A, 15172 Tallinn, Estonia
| | - Velda Lauringson
- Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 5, 51006 Tartu, Estonia; Institute of Ecology and Earth Sciences, Faculty of Science and Technology, University of Tartu, Vanemuise Str 46, 51014 Tartu, Estonia.
| | - Alo Laas
- Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 5, 51006 Tartu, Estonia
| | - Kersti Kangro
- Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 5, 51006 Tartu, Estonia; Tartu Observatory, Faculty of Science and Technology, University of Tartu, Observatooriumi 1, Tõravere, Nõo parish, 61602, Tartu County, Estonia
| | - Malle Viik
- Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 5, 51006 Tartu, Estonia
| | - Pille Meinson
- Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 5, 51006 Tartu, Estonia
| | - Fabien Cremona
- Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 5, 51006 Tartu, Estonia
| | - Peeter Nõges
- Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 5, 51006 Tartu, Estonia
| | - Tiina Nõges
- Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 5, 51006 Tartu, Estonia
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Pausan MR, Blohs M, Mahnert A, Moissl-Eichinger C. The sanitary indoor environment-a potential source for intact human-associated anaerobes. NPJ Biofilms Microbiomes 2022; 8:44. [PMID: 35650275 PMCID: PMC9160270 DOI: 10.1038/s41522-022-00305-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2021] [Accepted: 05/04/2022] [Indexed: 02/06/2023] Open
Abstract
A healthy human microbiome relies on the interaction with and exchange of microbes that takes place between the human body and its environment. People in high-income countries spend most of their time indoors and for this reason, the built environment (BE) might represent a potent source of commensal microbes. Anaerobic microbes are of particular interest, as researchers have not yet sufficiently clarified how the human microbiome acquires oxygen-sensitive microbes. We sampled the bathrooms in ten households and used propidium monoazide (PMA) to assess the viability of the collected prokaryotes. We compared the microbiome profiles based on 16S rRNA gene sequencing and confirmed our results by genetic and cultivation-based analyses. Quantitative and qualitative analysis revealed that most of the microbial taxa in the BE samples are human-associated. Less than 25% of the prokaryotic signatures originate from intact cells, indicating that aerobic and stress resistant taxa display an apparent survival advantage. However, we also confirmed the presence of intact, strictly anaerobic taxa on bathroom floors, including methanogenic archaea. As methanogens are regarded as highly sensitive to aerobic conditions, oxygen-tolerance experiments were performed with human-associated isolates to validate their survival. These results show that human-associated methanogens can survive oxic conditions for at least 6 h. We collected strong evidence that supports the hypothesis that obligate anaerobic taxa can survive in the BE for a limited amount of time. This suggests that the BE serves as a potential source of anaerobic human commensals.
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Affiliation(s)
- Manuela-Raluca Pausan
- Diagnostic and Research Institute of Hygiene, Microbiology and Environmental Medicine, Medical University of Graz, Graz, Austria
- Steigerwald Arzneimittelwerk GmbH, Bayer Consumer Health, Darmstadt, Germany
| | - Marcus Blohs
- Diagnostic and Research Institute of Hygiene, Microbiology and Environmental Medicine, Medical University of Graz, Graz, Austria
| | - Alexander Mahnert
- Diagnostic and Research Institute of Hygiene, Microbiology and Environmental Medicine, Medical University of Graz, Graz, Austria
| | - Christine Moissl-Eichinger
- Diagnostic and Research Institute of Hygiene, Microbiology and Environmental Medicine, Medical University of Graz, Graz, Austria.
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Nguyen VT, Maeda K, Nishimura Y, Nguyen TTH, La KV, Nguyen DD, Suzuki T. Emission factors for Vietnamese beef cattle manure sun-drying and the effects of drying on manure microbial community. PLoS One 2022; 17:e0264228. [PMID: 35294462 PMCID: PMC8926181 DOI: 10.1371/journal.pone.0264228] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2021] [Accepted: 02/04/2022] [Indexed: 01/04/2023] Open
Abstract
Livestock manure and its management are significant sources of greenhouse gas (GHG). In most Southeast Asian countries, the current GHG emissions are estimated by the Intergovernmental Panel on Climate Change (IPCC) Tier 1 approach using default emission factors. Sun-drying is the dominant manure treatment in Vietnam, and in this study, we measured GHG emissions during manure drying using a chamber-based approach. Results show the emission factors for CH4 and N2O were 0.295 ± 0.078 g kg-1 volatile solids (VS) and 0.132 ± 0.136 g N2O-N kg-1 Ninitial, respectively. We monitored the total bacterial/archaeal community using 16S rRNA gene amplicon sequencing and measured the abundance of functional genes required for methanogenesis (mcrA), nitrification (amoA) and denitrification (nirK, nirS and nosZ) processes. Methane emission occurred only at the beginning of the drying process (days 1 to 3). The results of amplicon sequencing indicated that the relative abundance of methanogens also decreased during this period. Although some nitrification activity was detected, there was no significant N2O emission. These findings well describe the manure management system in south Vietnam and the GHG emission from this manure category, paving the way for higher Tier estimations using country-specific values.
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Affiliation(s)
- Van Thanh Nguyen
- Institute of Animal Sciences for Southern Vietnam, Di An, Binh Duong, Vietnam
| | - Koki Maeda
- Crop, Livestock & Environment Division, JIRCAS, Tsukuba, Ibaraki, Japan
- * E-mail:
| | - Yukiko Nishimura
- Crop, Livestock & Environment Division, JIRCAS, Tsukuba, Ibaraki, Japan
| | | | - Kinh Van La
- Institute of Animal Sciences for Southern Vietnam, Di An, Binh Duong, Vietnam
| | - Dien Duc Nguyen
- Faculty of Animal Science -Veterinary Medicine, Tay Nguyen University, Buôn Ma Thuột, Đắk Lắk, Vietnam
| | - Tomoyuki Suzuki
- Crop, Livestock & Environment Division, JIRCAS, Tsukuba, Ibaraki, Japan
- Institute of Livestock and Grassland Science, NARO, Nasu-shiobara, Tochigi, Japan
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5
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Aoki M, Okubo K, Kusuoka R, Watari T, Syutsubo K, Yamaguchi T. Hexavalent Chromium Removal and Prokaryotic Community Analysis in Glass Column Reactor Packed with Aspen Wood as Solid Organic Substrate. Appl Biochem Biotechnol 2021; 194:1425-1441. [PMID: 34739702 DOI: 10.1007/s12010-021-03738-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Accepted: 10/21/2021] [Indexed: 10/19/2022]
Abstract
Microbial hexavalent chromium (Cr(VI)) reduction is a promising method for Cr(VI)-laden wastewater treatment. However, the soluble organic substrate required for heterotrophic microbial Cr(VI) reduction necessitates constant supervision, and an excessive supply of soluble organic substrate can result in deterioration of the quality of the effluent. In this study, we evaluated aspen wood, a low-cost lignocellulose biomass, as a solid organic substrate for heterotrophic Cr(VI) reduction. A laboratory-scale aspen wood-packed glass column reactor inoculated with activated sludge was operated for 148 days for evaluation. Following reactor operation, an effective average dissolved Cr(VI) removal rate of 0.75 mg L-1 h-1 was confirmed under an average dissolved Cr(VI) loading rate of 0.90 mg L-1 h-1. Subsequently, 16S ribosomal ribonucleic acid gene amplicon sequencing analysis revealed that the dominant prokaryotic operational taxonomic units detected in the reactor were associated with prokaryotic lineages with the capacity for lignocellulose biodegradation, Cr compound resistance, and Cr(VI) reduction. Proteobacteria and Chloroflexi were two major prokaryotic phyla in the reactor. Our data indicate that aspen wood is an effective solid organic substrate for the development of simplified, effective, and low-cost microbial Cr(VI)-removing reactors.
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Affiliation(s)
- Masataka Aoki
- Regionl Environment Conservation Division, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan. .,Department of Civil Engineering, National Institute of Technology, Wakayama College, Gobo, Wakayama, Japan.
| | - Karen Okubo
- Department of Civil Engineering, National Institute of Technology, Wakayama College, Gobo, Wakayama, Japan
| | - Ryoyu Kusuoka
- Department of Civil Engineering, National Institute of Technology, Wakayama College, Gobo, Wakayama, Japan
| | - Takahiro Watari
- Department of Civil and Environmental Engineering, Nagaoka University of Technology, Nagaoka, Niigata, Japan
| | - Kazuaki Syutsubo
- Regionl Environment Conservation Division, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan
| | - Takashi Yamaguchi
- Department of Civil and Environmental Engineering, Nagaoka University of Technology, Nagaoka, Niigata, Japan.,Department of Science of Technology Innovation, Nagaoka University of Technology, Nagaoka, Niigata, Japan
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Li C, Hambright KD, Bowen HG, Trammell MA, Grossart HP, Burford MA, Hamilton DP, Jiang H, Latour D, Meyer EI, Padisák J, Zamor RM, Krumholz LR. Global co-occurrence of methanogenic archaea and methanotrophic bacteria in Microcystis aggregates. Environ Microbiol 2021; 23:6503-6519. [PMID: 34327792 DOI: 10.1111/1462-2920.15691] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Accepted: 07/26/2021] [Indexed: 11/29/2022]
Abstract
Global warming and eutrophication contribute to the worldwide increase in cyanobacterial blooms, and the level of cyanobacterial biomass is strongly associated with rises in methane emissions from surface lake waters. Hence, methane-metabolizing microorganisms may be important for modulating carbon flow in cyanobacterial blooms. Here, we surveyed methanogenic and methanotrophic communities associated with floating Microcystis aggregates in 10 lakes spanning four continents, through sequencing of 16S rRNA and functional marker genes. Methanogenic archaea (mainly Methanoregula and Methanosaeta) were detectable in 5 of the 10 lakes and constituted the majority (~50%-90%) of the archaeal community in these lakes. Three of the 10 lakes contained relatively more abundant methanotrophs than the other seven lakes, with the methanotrophic genera Methyloparacoccus, Crenothrix, and an uncultured species related to Methylobacter dominating and nearly exclusively found in each of those three lakes. These three are among the five lakes in which methanogens were observed. Operational taxonomic unit (OTU) richness and abundance of methanotrophs were strongly positively correlated with those of methanogens, suggesting that their activities may be coupled. These Microcystis-aggregate-associated methanotrophs may be responsible for a hitherto overlooked sink for methane in surface freshwaters, and their co-occurrence with methanogens sheds light on the methane cycle in cyanobacterial aggregates.
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Affiliation(s)
- Chuang Li
- Department of Microbiology and Plant Biology, Institute for Energy and the Environment, The University of Oklahoma, Norman, Ok, USA
| | - K David Hambright
- Plankton Ecology and Limnology Laboratory, Program in Ecology and Evolutionary Biology, and the Geographical Ecology Group, Department of Biology, The University of Oklahoma, Norman, OK, USA
| | - Hannah G Bowen
- Department of Microbiology and Immunology, The University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
| | - Majoi A Trammell
- Biomedical Research Center, The University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
| | - Hans-Peter Grossart
- Department of Experimental Limnology, Leibniz Institute for Freshwater Ecology and Inland Fisheries, Stechlin, and Institute for Biochemistry and Biology, Potsdam University, Potsdam, Germany
| | - Michele A Burford
- Australian Rivers Institute and School of Environment and Science, Griffith University, Nathan, Qld, Australia
| | - David P Hamilton
- Australian Rivers Institute, Griffith University, Nathan, Qld, Australia
| | - Helong Jiang
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, China
| | - Delphine Latour
- Université Clermont Auvergne CNRS, LMGE, Aubière Cedex, France
| | - Elisabeth I Meyer
- Institute for Evolution and Biodiversity, University of Münster, Münster, Germany
| | - Judit Padisák
- Research Group of Limnology, Centre of Natural Sciences, University of Pannonia, Veszprém, Hungary
| | | | - Lee R Krumholz
- Department of Microbiology and Plant Biology, Institute for Energy and the Environment, The University of Oklahoma, Norman, Ok, USA
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Cunningham JL, Bramstång L, Singh A, Jayarathna S, Rasmusson AJ, Moazzami A, Müller B. Impact of time and temperature on gut microbiota and SCFA composition in stool samples. PLoS One 2020; 15:e0236944. [PMID: 32745090 PMCID: PMC7398539 DOI: 10.1371/journal.pone.0236944] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Accepted: 07/16/2020] [Indexed: 01/08/2023] Open
Abstract
Gut dysbiosis has been implicated in the pathophysiology of a growing number of non-communicable diseases. High through-put sequencing technologies and short chain fatty acid (SCFA) profiling enables surveying of the composition and function of the gut microbiota and provide key insights into host-microbiome interactions. However, a methodological problem with analyzing stool samples is that samples are treated and stored differently prior to submission for analysis potentially influencing the composition of the microbiota and its metabolites. In the present study, we simulated the sample acquisition of a large-scale study, in which stool samples were stored for up to two days in the fridge or at room temperature before being handed over to the hospital. To assess the influence of time and temperature on the microbial community and on SCFA composition in a controlled experimental setting, the stool samples of 10 individuals were exposed to room and fridge temperatures for 24 and 48 hours, respectively, and analyzed using 16S rRNA gene amplicon sequencing, qPCR and nuclear magnetic resonance spectroscopy. To best of our knowledge, this is the first study to investigate the influence of storage time and temperature on the absolute abundance of methanogens, and of Lactobacillus reuteri. The results indicate that values obtained for methanogens, L. reuteri and total bacteria are still representative even after storage for up to 48 hours at RT (20°C) or 4°C. The overall microbial composition and structure appeared to be influenced more by laboratory errors introduced during sample processing than by the actual effects of temperature and time. Although microbial activity was demonstrated by elevated SCFA at both 4°C and RT, SCFAs ratios were more stable over the different conditions and may be considered as long as samples are come from similar storage conditions.
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Affiliation(s)
- Janet L. Cunningham
- Department of Neurosciences, Psychiatry, Uppsala University, Uppsala, Sweden
| | - Ludvig Bramstång
- Department of Neurosciences, Psychiatry, Uppsala University, Uppsala, Sweden
| | - Abhijeet Singh
- Department of Molecular Sciences, BioCentrum, Swedish University of Agricultural Sciences, Uppsala, Sweden
| | - Shishanthi Jayarathna
- Department of Molecular Sciences, BioCentrum, Swedish University of Agricultural Sciences, Uppsala, Sweden
| | - Annica J. Rasmusson
- Department of Neurosciences, Psychiatry, Uppsala University, Uppsala, Sweden
| | - Ali Moazzami
- Department of Molecular Sciences, BioCentrum, Swedish University of Agricultural Sciences, Uppsala, Sweden
| | - Bettina Müller
- Department of Molecular Sciences, BioCentrum, Swedish University of Agricultural Sciences, Uppsala, Sweden
- * E-mail:
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Li M, Peng C, Zhu Q, Zhou X, Yang G, Song X, Zhang K. The significant contribution of lake depth in regulating global lake diffusive methane emissions. WATER RESEARCH 2020; 172:115465. [PMID: 31972411 DOI: 10.1016/j.watres.2020.115465] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Revised: 12/23/2019] [Accepted: 01/01/2020] [Indexed: 06/10/2023]
Abstract
Global lakes have been identified as an important component of natural methane (CH4) sources. Given that lake CH4 emissions involve multiple, complex processes influenced by various environmental factors, estimates of global lake CH4 emissions are largely uncertain. In this study, we compiled global CH4 emission data on 744 lakes from published studies, and found a significantly negative correlation (R2 = 0.50, p < 0.01) between diffusive CH4 flux and lake maximum depth. Further analysis indicated that no significant differences in global sediment CH4 production were found for the different maximum depths investigated. Owing to the longer oxidation pathway, presence of oxycline layer, and the lower nutrient environment, deeper lakes yield less diffusive CH4 efflux compared to shallower lakes. Additionally, we also found that lake area was negatively correlated (R2 = 0.13, p < 0.01) to diffusive CH4 flux. Therefore, based on empirical correlations between lake morphometry (maximum depth and area) and diffusive CH4 emission, as well as the combination of two lake databases, we estimated that the annual diffusive CH4 emission from global lakes is approximately 11.2 (6.2-19.5) Tg CH4/yr, and greater than 84% is emitted from lakes with a mean depth of less than 5 m. Furthermore, two regions, 40-70° N (30.4%) and 20° S∼10° N (37.4%), were found to be the dominant contributors of global lake diffusive CH4 emissions, resulting from the considerable total lake area and the extensive shallow lakes in these regions. This study highlights the significance of the 'depth-effect' which controls the spatial distribution of lake diffusive CH4 flux and allows for the quantification of global lake diffusive CH4 emissions.
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Affiliation(s)
- Mingxu Li
- Center for Ecological Forecasting and Global Change, College of Forestry, Northwest A&F University, Yangling, Shaanxi, 712100, China; Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China; Department of Biology Sciences, Institute of Environment Sciences, University of Quebec at Montreal, C.P. 8888, Succ. Center-Ville, Montreal, H3C 3P8, Canada
| | - Changhui Peng
- Department of Biology Sciences, Institute of Environment Sciences, University of Quebec at Montreal, C.P. 8888, Succ. Center-Ville, Montreal, H3C 3P8, Canada; Center for Ecological Forecasting and Global Change, College of Forestry, Northwest A&F University, Yangling, Shaanxi, 712100, China.
| | - Qiuan Zhu
- Center for Ecological Forecasting and Global Change, College of Forestry, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Xiaolu Zhou
- Center for Ecological Forecasting and Global Change, College of Forestry, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Gang Yang
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, 621010, China
| | - Xinzhang Song
- The Nurturing Station for the State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an, 311300, China
| | - Kerou Zhang
- Institute of Wetland Research, Chinese Academy of Forestry, Beijing, 100091, China
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9
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Günthel M, Donis D, Kirillin G, Ionescu D, Bizic M, McGinnis DF, Grossart HP, Tang KW. Contribution of oxic methane production to surface methane emission in lakes and its global importance. Nat Commun 2019; 10:5497. [PMID: 31792203 PMCID: PMC6888895 DOI: 10.1038/s41467-019-13320-0] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2019] [Accepted: 10/30/2019] [Indexed: 11/09/2022] Open
Abstract
Recent discovery of oxic methane production in sea and lake waters, as well as wetlands, demands re-thinking of the global methane cycle and re-assessment of the contribution of oxic waters to atmospheric methane emission. Here we analysed system-wide sources and sinks of surface-water methane in a temperate lake. Using a mass balance analysis, we show that internal methane production in well-oxygenated surface water is an important source for surface-water methane during the stratified period. Combining our results and literature reports, oxic methane contribution to emission follows a predictive function of littoral sediment area and surface mixed layer volume. The contribution of oxic methane source(s) is predicted to increase with lake size, accounting for the majority (>50%) of surface methane emission for lakes with surface areas >1 km2.
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Affiliation(s)
- Marco Günthel
- Department of Biosciences, Swansea University, SA2 8PP, Swansea, UK.
| | - Daphne Donis
- Aquatic Physics Group, Department F.-A. Forel for Environmental and Aquatic Sciences (DEFSE), Faculty of Science, University of Geneva, 1211, Geneva, Switzerland
| | - Georgiy Kirillin
- Department of Ecohydrology, Leibniz Institute of Freshwater Ecology and Inland Fisheries, 12587, Berlin, Germany
| | - Danny Ionescu
- Department of Experimental Limnology, Leibniz Institute of Freshwater Ecology and Inland Fisheries, 16775, Stechlin, Germany
| | - Mina Bizic
- Department of Experimental Limnology, Leibniz Institute of Freshwater Ecology and Inland Fisheries, 16775, Stechlin, Germany
| | - Daniel F McGinnis
- Aquatic Physics Group, Department F.-A. Forel for Environmental and Aquatic Sciences (DEFSE), Faculty of Science, University of Geneva, 1211, Geneva, Switzerland.
| | - Hans-Peter Grossart
- Department of Experimental Limnology, Leibniz Institute of Freshwater Ecology and Inland Fisheries, 16775, Stechlin, Germany. .,Institute of Biochemistry and Biology, Potsdam University, 14476, Potsdam, Germany.
| | - Kam W Tang
- Department of Biosciences, Swansea University, SA2 8PP, Swansea, UK.
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Cai P, Ning Z, Zhang N, Zhang M, Guo C, Niu M, Shi J. Insights into Biodegradation Related Metabolism in an Abnormally Low Dissolved Inorganic Carbon (DIC) Petroleum-Contaminated Aquifer by Metagenomics Analysis. Microorganisms 2019; 7:microorganisms7100412. [PMID: 31581560 PMCID: PMC6843334 DOI: 10.3390/microorganisms7100412] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2019] [Revised: 09/06/2019] [Accepted: 09/25/2019] [Indexed: 11/16/2022] Open
Abstract
In petroleum-contaminated aquifers, biodegradation is always associated with various types of microbial metabolism. It can be classified as autotrophic (such as methanogenic and other carbon fixation) and heterotrophic (such as nitrate/sulfate reduction and hydrocarbon consumption) metabolism. For each metabolic type, there are several key genes encoding the reaction enzymes, which can be identified by metagenomics analysis. Based on this principle, in an abnormally low dissolved inorganic carbon (DIC) petroleum-contaminated aquifer in North China, nine groundwater samples were collected along the groundwater flow, and metagenomics analysis was used to discover biodegradation related metabolism by key genes. The major new finding is that autotrophic metabolism was revealed, and, more usefully, we attempt to explain the reasons for abnormally low DIC. The results show that the methanogenesis gene, Mcr, was undetected but more carbon fixation genes than nitrate reduction and sulfate genes were found. This suggests that there may be a considerable number of autotrophic microorganisms that cause the phenomenon of low concentration of dissolved inorganic carbon in contaminated areas. The metagenomics data also revealed that most heterotrophic, sulfate, and nitrate reduction genes in the aquifer were assimilatory sulfate and dissimilatory nitrate reduction genes. Although there was limited dissolved oxygen, aerobic degrading genes AlkB and Cdo were more abundant than anaerobic degrading genes AssA and BssA. The metagenomics information can enrich our microorganic knowledge about petroleum-contaminated aquifers and provide basic data for further bioremediation.
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Affiliation(s)
- Pingping Cai
- Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang 050061, China.
- School of Resources and Environmental Engineering, HeFei University of Technology, Hefei 230009, China.
| | - Zhuo Ning
- Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang 050061, China.
- Key Laboratory of Groundwater Remediation of Hebei Province, Zhengding 050083, China.
| | - Ningning Zhang
- Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang 050061, China.
- School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China.
| | - Min Zhang
- Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang 050061, China.
| | - Caijuan Guo
- Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang 050061, China.
| | - Manlan Niu
- School of Resources and Environmental Engineering, HeFei University of Technology, Hefei 230009, China.
| | - Jiansheng Shi
- Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang 050061, China.
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11
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Meng L, Xie L, Riya S, Terada A, Hosomi M. Impact of turning waste on performance and energy balance in thermophilic solid-state anaerobic digestion of agricultural waste. WASTE MANAGEMENT (NEW YORK, N.Y.) 2019; 87:183-191. [PMID: 31109517 DOI: 10.1016/j.wasman.2019.02.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Revised: 01/04/2019] [Accepted: 02/05/2019] [Indexed: 06/09/2023]
Abstract
Mixing is an important operation in solid-state anaerobic digestion (SS-AD) to improve the mass transfer of the solid phase. This study proposed simple turning by loader in common garage-type digester without commonly used mixer or percolation system (simplified SS-AD). In simplified-SS-AD, turning is conducted in open condition. Thus, oxidation of anaerobic sludge during turning would influence digestion performance. Therefore, in this study, the effect of turning wastes by mixing during digestion on a simplified SS-AD fed with rice straw and pig urine was investigated. Four different mixing frequency levels-no mixing (M0) and mixing once a day (M-1/1), once every 3 days (M-1/3) and once a week (M-1/7)-were conducted. Methane yields of M0, M-1/3 and M-1/7 were comparable with each other. Methane yield and lag period of M-1/1 were approximately 61% and 155% of M0 (351.2 mL/g VS and 4.7 days), respectively. Furthermore, the chemical oxygen demand (COD) of acetate accumulated in the digestate of M-1/1 was comparable to the difference in the COD of methane production between M-1/1 and the other treatments. Mixing every day also resulted in a higher oxidation-reduction potential and carbon dioxide content. These findings suggest that methanogenesis was inhibited in M-1/1 by frequent mixing in the atmosphere. Net energy analysis of SS-AD plant operation showed that M0 can obtain the highest net energy gain, whereas net energy production of M-1/7 was reduced by rewarming after mixing. Therefore, no mixing is the most effective approach for the proposed simplified process.
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Affiliation(s)
- Lingyu Meng
- Department of Chemical Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka, Koganei, Tokyo 184-8588, Japan
| | - Li Xie
- Department of Chemical Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka, Koganei, Tokyo 184-8588, Japan
| | - Shohei Riya
- Department of Chemical Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka, Koganei, Tokyo 184-8588, Japan.
| | - Akihiko Terada
- Department of Chemical Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka, Koganei, Tokyo 184-8588, Japan
| | - Masaaki Hosomi
- Department of Chemical Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka, Koganei, Tokyo 184-8588, Japan
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12
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Guillén Y, Noguera-Julian M, Rivera J, Casadellà M, Zevin AS, Rocafort M, Parera M, Rodríguez C, Arumí M, Carrillo J, Mothe B, Estany C, Coll J, Bravo I, Herrero C, Saz J, Sirera G, Torrella A, Navarro J, Crespo M, Negredo E, Brander C, Blanco J, Calle ML, Klatt NR, Clotet B, Paredes R. Low nadir CD4+ T-cell counts predict gut dysbiosis in HIV-1 infection. Mucosal Immunol 2019; 12:232-246. [PMID: 30171206 DOI: 10.1038/s41385-018-0083-7] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Revised: 08/03/2018] [Accepted: 08/08/2018] [Indexed: 02/04/2023]
Abstract
Human immunodeficiency virus (HIV)-1 infection causes severe gut and systemic immune damage, but its effects on the gut microbiome remain unclear. Previous shotgun metagenomic studies in HIV-negative subjects linked low-microbial gene counts (LGC) to gut dysbiosis in diseases featuring intestinal inflammation. Using a similar approach in 156 subjects with different HIV-1 phenotypes, we found a strong, independent, dose-effect association between nadir CD4+ T-cell counts and LGC. As in other diseases involving intestinal inflammation, the gut microbiomes of subjects with LGC were enriched in gram-negative Bacteroides, acetogenic bacteria and Proteobacteria, which are able to metabolize reactive oxygen and nitrogen species; and were depleted in oxygen-sensitive methanogenic archaea and sulfate-reducing bacteria. Interestingly, subjects with LGC also showed increased butyrate levels in direct fecal measurements, consistent with enrichment in Roseburia intestinalis despite reductions in other butyrate producers. The microbiomes of subjects with LGC were also enriched in bacterial virulence factors, as well as in genes associated with beta-lactam, lincosamide, tetracycline, and macrolide resistance. Thus, low nadir CD4+ T-cell counts, rather than HIV-1 serostatus per se, predict the presence of gut dysbiosis in HIV-1 infected subjects. Such dysbiosis does not display obvious HIV-specific features; instead, it shares many similarities with other diseases featuring gut inflammation.
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Affiliation(s)
- Yolanda Guillén
- irsiCaixa AIDS Research Institute, Ctra de Canyet s/n, Badalona, 08916, Catalonia, Spain.,Universitat Autònoma de Barcelona, Bellaterra, 08193, Catalonia, Spain
| | - Marc Noguera-Julian
- irsiCaixa AIDS Research Institute, Ctra de Canyet s/n, Badalona, 08916, Catalonia, Spain.,Universitat Autònoma de Barcelona, Bellaterra, 08193, Catalonia, Spain.,Universitat de Vic-Universitat Central de Catalunya, C. Sagrada Família 7, Vic, 08500, Catalonia, Spain
| | - Javier Rivera
- irsiCaixa AIDS Research Institute, Ctra de Canyet s/n, Badalona, 08916, Catalonia, Spain.,Universitat de Vic-Universitat Central de Catalunya, C. Sagrada Família 7, Vic, 08500, Catalonia, Spain
| | - Maria Casadellà
- irsiCaixa AIDS Research Institute, Ctra de Canyet s/n, Badalona, 08916, Catalonia, Spain.,Universitat Autònoma de Barcelona, Bellaterra, 08193, Catalonia, Spain
| | - Alexander S Zevin
- University of Washington, 3018 Western Avenue, Seattle, WA, 98121, USA
| | - Muntsa Rocafort
- irsiCaixa AIDS Research Institute, Ctra de Canyet s/n, Badalona, 08916, Catalonia, Spain.,Universitat Autònoma de Barcelona, Bellaterra, 08193, Catalonia, Spain
| | - Mariona Parera
- irsiCaixa AIDS Research Institute, Ctra de Canyet s/n, Badalona, 08916, Catalonia, Spain
| | - Cristina Rodríguez
- irsiCaixa AIDS Research Institute, Ctra de Canyet s/n, Badalona, 08916, Catalonia, Spain
| | - Marçal Arumí
- irsiCaixa AIDS Research Institute, Ctra de Canyet s/n, Badalona, 08916, Catalonia, Spain
| | - Jorge Carrillo
- irsiCaixa AIDS Research Institute, Ctra de Canyet s/n, Badalona, 08916, Catalonia, Spain.,Universitat Autònoma de Barcelona, Bellaterra, 08193, Catalonia, Spain
| | - Beatriz Mothe
- irsiCaixa AIDS Research Institute, Ctra de Canyet s/n, Badalona, 08916, Catalonia, Spain.,Universitat de Vic-Universitat Central de Catalunya, C. Sagrada Família 7, Vic, 08500, Catalonia, Spain.,Infectious Diseases Service & Lluita contra la SIDA Foundation, Hospital Universitari Germans Trias i Pujol, Ctra de Canyet s/n, Badalona, 08916, Catalonia, Spain
| | - Carla Estany
- Infectious Diseases Service & Lluita contra la SIDA Foundation, Hospital Universitari Germans Trias i Pujol, Ctra de Canyet s/n, Badalona, 08916, Catalonia, Spain
| | - Josep Coll
- irsiCaixa AIDS Research Institute, Ctra de Canyet s/n, Badalona, 08916, Catalonia, Spain.,Infectious Diseases Service & Lluita contra la SIDA Foundation, Hospital Universitari Germans Trias i Pujol, Ctra de Canyet s/n, Badalona, 08916, Catalonia, Spain
| | - Isabel Bravo
- Infectious Diseases Service & Lluita contra la SIDA Foundation, Hospital Universitari Germans Trias i Pujol, Ctra de Canyet s/n, Badalona, 08916, Catalonia, Spain
| | - Cristina Herrero
- Infectious Diseases Service & Lluita contra la SIDA Foundation, Hospital Universitari Germans Trias i Pujol, Ctra de Canyet s/n, Badalona, 08916, Catalonia, Spain
| | - Jorge Saz
- BCN Checkpoint, Carrer del Comte Borrell, 164, Barcelona, 08015, Catalonia, Spain
| | - Guillem Sirera
- Infectious Diseases Service & Lluita contra la SIDA Foundation, Hospital Universitari Germans Trias i Pujol, Ctra de Canyet s/n, Badalona, 08916, Catalonia, Spain
| | - Ariadna Torrella
- Infectious Diseases Unit, Hospital Universitari Vall d'Hebrón, Passeig de la Vall d'Hebrón, 119-129, Barcelona, 08035, Catalonia, Spain
| | - Jordi Navarro
- Universitat Autònoma de Barcelona, Bellaterra, 08193, Catalonia, Spain.,Infectious Diseases Unit, Hospital Universitari Vall d'Hebrón, Passeig de la Vall d'Hebrón, 119-129, Barcelona, 08035, Catalonia, Spain
| | - Manuel Crespo
- Infectious Diseases Unit, Internal Medicine Department, Complexo Hospitalario Universitario, Vigo. IIS Galicia Sur, Estrada de Clara Campoamor, 341, Vigo, 36312, Pontevedra, Spain
| | - Eugènia Negredo
- Universitat Autònoma de Barcelona, Bellaterra, 08193, Catalonia, Spain.,Universitat de Vic-Universitat Central de Catalunya, C. Sagrada Família 7, Vic, 08500, Catalonia, Spain.,Infectious Diseases Service & Lluita contra la SIDA Foundation, Hospital Universitari Germans Trias i Pujol, Ctra de Canyet s/n, Badalona, 08916, Catalonia, Spain
| | - Christian Brander
- irsiCaixa AIDS Research Institute, Ctra de Canyet s/n, Badalona, 08916, Catalonia, Spain.,Universitat Autònoma de Barcelona, Bellaterra, 08193, Catalonia, Spain.,Universitat de Vic-Universitat Central de Catalunya, C. Sagrada Família 7, Vic, 08500, Catalonia, Spain.,Institució Catalana de Recerca i Estudis Avançats (ICREA), Pg. Lluís Companys 23, Barcelona, 08010, Catalonia, Spain
| | - Julià Blanco
- irsiCaixa AIDS Research Institute, Ctra de Canyet s/n, Badalona, 08916, Catalonia, Spain.,Universitat Autònoma de Barcelona, Bellaterra, 08193, Catalonia, Spain.,Universitat de Vic-Universitat Central de Catalunya, C. Sagrada Família 7, Vic, 08500, Catalonia, Spain
| | - Maria Luz Calle
- Universitat de Vic-Universitat Central de Catalunya, C. Sagrada Família 7, Vic, 08500, Catalonia, Spain
| | - Nichole R Klatt
- University of Washington, 3018 Western Avenue, Seattle, WA, 98121, USA
| | - Bonaventura Clotet
- irsiCaixa AIDS Research Institute, Ctra de Canyet s/n, Badalona, 08916, Catalonia, Spain.,Universitat Autònoma de Barcelona, Bellaterra, 08193, Catalonia, Spain.,Universitat de Vic-Universitat Central de Catalunya, C. Sagrada Família 7, Vic, 08500, Catalonia, Spain.,Infectious Diseases Service & Lluita contra la SIDA Foundation, Hospital Universitari Germans Trias i Pujol, Ctra de Canyet s/n, Badalona, 08916, Catalonia, Spain
| | - Roger Paredes
- irsiCaixa AIDS Research Institute, Ctra de Canyet s/n, Badalona, 08916, Catalonia, Spain. .,Universitat Autònoma de Barcelona, Bellaterra, 08193, Catalonia, Spain. .,Universitat de Vic-Universitat Central de Catalunya, C. Sagrada Família 7, Vic, 08500, Catalonia, Spain. .,Infectious Diseases Service & Lluita contra la SIDA Foundation, Hospital Universitari Germans Trias i Pujol, Ctra de Canyet s/n, Badalona, 08916, Catalonia, Spain.
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13
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Brown LE, Chen CY, Voytek MA, Amirbahman A. The effect of sediment mixing on mercury dynamics in two intertidal mudflats at Great Bay Estuary, New Hampshire, USA. MARINE CHEMISTRY 2015; 177:731-741. [PMID: 26924879 PMCID: PMC4765959 DOI: 10.1016/j.marchem.2015.10.011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Estuarine sediments store particulate contaminants including mercury (Hg). We studied Hg sediment dynamics in two intertidal mudflats at Great Bay estuary, NH, over multiple years. Sediments at both mudflats were physically mixed down to ~10 cm, as determined by 7Be measurements, albeit via different mechanisms. Portsmouth mudflat (PT) sediments were subject to bioturbation by infaunal organisms and Squamscott mudflat (SQ) sediments were subject to erosion and redeposition. The presence of higher concentrations of fresh Fe(III) hydroxide at PT suggested bioirrigation by the polychaetes (Nereis virens). At depths where infaunal bioirrigation was observed, pore-water inorganic Hg (Hgi) and methylmercury (MeHg) were lower potentially due to their interaction with Fe(III) hydroxide. Methylmercury concentrations increased immediately below this zone in some samples, suggesting that the observed increase in material flux in bioirrigated sediments may initiate from lower depths. Pore water in sediment at PT also had higher fractions of more protein-like and labile DOC than those at SQ that can lead to increased MeHg production in PT, especially at depths where Hgi is not removed from solution by Fe(III) hydroxide. Where sediment erosion and redeposition were observed at SQ, Hg species distribution was extended deeper into the sediment column. Moreover, methyl coenzyme M reductase (MCR) and mercury reductase (mer-A) genes were higher at SQ than PT suggesting differences in conditions for Hg cycling. Results showed that the near-surface region of high MeHg concentrations commonly observed in unmixed sediments does not exist in physically mixed sediments that are common in many estuarine environments.
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Affiliation(s)
- Lauren E. Brown
- Department of Civil and Environmental Engineering, University of Maine, Orono, ME 04469, USA
| | - Celia Y. Chen
- Department of Biological Sciences, Dartmouth College, Hanover, NH 03755, USA
| | - Mary A. Voytek
- Astrobiology Program, National Aeronautics and Space Administration, Washington DC, USA
| | - Aria Amirbahman
- Department of Civil and Environmental Engineering, University of Maine, Orono, ME 04469, USA
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14
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Lim S, Stolyar S, Hillesland K. Culturing anaerobes to use as a model system for studying the evolution of syntrophic mutualism. Methods Mol Biol 2015; 1151:103-15. [PMID: 24838882 DOI: 10.1007/978-1-4939-0554-6_8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
Our current understanding of the evolution of mutualisms is limited partly because there have been relatively few model systems for studying it in real time. A model mutualistic interaction between the bacterium D. vulgaris and the archaeaon M. maripaludis was developed to allow for rigorous tests of general hypotheses about the evolution and ecology of mutualisms. This model system also allows us to develop an evolutionary genetics perspective on an interaction that plays a key ecological role in many oxygen-free microbial communities. Here, we describe the techniques used to make anoxic media for propagating these species alone or in conditions that require their cooperation.
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Affiliation(s)
- Sujung Lim
- Biological Sciences Division, School of STEM, UW Bothell, 358538, Bothell, WA, 98011, USA
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15
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Liu C, Liu W, Liu J, Zhou X, Wang A, Nan J. The effect of a short term biofilm-aeration treatment on energy recovery in microbial electrolysis cells. RSC Adv 2015. [DOI: 10.1039/c5ra11354g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Short-term air exposure to biofilm effectively inhibited methanogenesis in a MEC bioanode during 24 h batch operation. Compared to the anaerobic control, biofilm aeration increased H2 yield but presented little damage to the Coulombic efficiency.
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Affiliation(s)
- Chong Liu
- State Key Laboratory of Urban Water Resource and Environment
- Harbin Institute of Technology (SKLUWRE, HIT)
- Harbin
- China
| | - Wenzong Liu
- State Key Laboratory of Urban Water Resource and Environment
- Harbin Institute of Technology (SKLUWRE, HIT)
- Harbin
- China
- Key Laboratory of Environmental Biotechnology
| | - Jia Liu
- State Key Laboratory of Urban Water Resource and Environment
- Harbin Institute of Technology (SKLUWRE, HIT)
- Harbin
- China
| | - Xu Zhou
- Advanced Water Management Centre
- The University of Queensland
- Australia
| | - Aijie Wang
- State Key Laboratory of Urban Water Resource and Environment
- Harbin Institute of Technology (SKLUWRE, HIT)
- Harbin
- China
- Key Laboratory of Environmental Biotechnology
| | - Jun Nan
- State Key Laboratory of Urban Water Resource and Environment
- Harbin Institute of Technology (SKLUWRE, HIT)
- Harbin
- China
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16
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Ganigué R, Yuan Z. Impact of oxygen injection on CH4 and N2O emissions from rising main sewers. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2014; 144:279-285. [PMID: 24975803 DOI: 10.1016/j.jenvman.2014.04.023] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2014] [Revised: 04/22/2014] [Accepted: 04/22/2014] [Indexed: 06/03/2023]
Abstract
Oxygen injection is a commonly used mitigation strategy for sulfide control in sewers. Methane, a potent greenhouse gas, is also produced in sewers. Oxygen injection may reduce methane generation/emission, but could potentially lead to N2O production due to the development of a nitrifying microbial community. The impact of oxygen dosing for sulfide control in sewers on CH4 and N2O production was assessed in this study in laboratory sewer reactors. Results showed that oxygen injection is able to reduce CH4 formation in sewers, although full control of CH4 was not achieved, likely due to partial oxygen penetration into sewer biofilm. The experimental results also revealed a nitrogen loss of around 5 mN/L. However, no significant N2O accumulation was detected.
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Affiliation(s)
- Ramon Ganigué
- Advanced Water Management Centre, Building 60, Research Road, The University of Queensland, St. Lucia, Brisbane, QLD 4072, Australia; LEQUIA, Institute of the Environment, University of Girona, Campus Montilivi, E-17071 Girona, Catalonia, Spain.
| | - Zhiguo Yuan
- Advanced Water Management Centre, Building 60, Research Road, The University of Queensland, St. Lucia, Brisbane, QLD 4072, Australia.
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17
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Wells GF, Wu CH, Piceno YM, Eggleston B, Brodie EL, DeSantis TZ, Andersen GL, Hazen TC, Francis CA, Criddle CS. Microbial biogeography across a full-scale wastewater treatment plant transect: evidence for immigration between coupled processes. Appl Microbiol Biotechnol 2014; 98:4723-36. [DOI: 10.1007/s00253-014-5564-3] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2013] [Revised: 01/20/2014] [Accepted: 01/21/2014] [Indexed: 11/28/2022]
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18
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Morris BEL, Henneberger R, Huber H, Moissl-Eichinger C. Microbial syntrophy: interaction for the common good. FEMS Microbiol Rev 2013; 37:384-406. [PMID: 23480449 DOI: 10.1111/1574-6976.12019] [Citation(s) in RCA: 457] [Impact Index Per Article: 41.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2012] [Revised: 02/25/2013] [Accepted: 02/27/2013] [Indexed: 11/30/2022] Open
Abstract
Classical definitions of syntrophy focus on a process, performed through metabolic interaction between dependent microbial partners, such as the degradation of complex organic compounds under anoxic conditions. However, examples from past and current scientific discoveries suggest that a new, simple but wider definition is necessary to cover all aspects of microbial syntrophy. We suggest the term 'obligately mutualistic metabolism', which still focuses on microbial metabolic cooperation but also includes an ecological aspect: the benefit for both partners. By the combined metabolic activity of microorganisms, endergonic reactions can become exergonic through the efficient removal of products and therefore enable a microbial community to survive with minimal energy resources. Here, we explain the principles of classical and non-classical syntrophy and illustrate the concepts with various examples. We present biochemical fundamentals that allow microorganism to survive under a range of environmental conditions and to drive important biogeochemical processes. Novel technologies have contributed to the understanding of syntrophic relationships in cultured and uncultured systems. Recent research highlights that obligately mutualistic metabolism is not limited to certain metabolic pathways nor to certain environments or microorganisms. This beneficial microbial interaction is not restricted to the transfer of reducing agents such as hydrogen or formate, but can also involve the exchange of organic, sulfurous- and nitrogenous compounds or the removal of toxic compounds.
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Affiliation(s)
- Brandon E L Morris
- Microbiology, Institute for Biology II, University of Freiburg, Freiburg, Germany
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19
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Rittmann S, Seifert A, Herwig C. Essential prerequisites for successful bioprocess development of biological CH4production from CO2and H2. Crit Rev Biotechnol 2013; 35:141-51. [DOI: 10.3109/07388551.2013.820685] [Citation(s) in RCA: 92] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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20
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Isom CE, Turner JL, Lessner DJ, Karr EA. Redox-sensitive DNA binding by homodimeric Methanosarcina acetivorans MsvR is modulated by cysteine residues. BMC Microbiol 2013; 13:163. [PMID: 23865844 PMCID: PMC3729527 DOI: 10.1186/1471-2180-13-163] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2013] [Accepted: 07/12/2013] [Indexed: 11/16/2022] Open
Abstract
Background Methanoarchaea are among the strictest known anaerobes, yet they can survive exposure to oxygen. The mechanisms by which they sense and respond to oxidizing conditions are unknown. MsvR is a transcription regulatory protein unique to the methanoarchaea. Initially identified and characterized in the methanogen Methanothermobacter thermautotrophicus (Mth), MthMsvR displays differential DNA binding under either oxidizing or reducing conditions. Since MthMsvR regulates a potential oxidative stress operon in M. thermautotrophicus, it was hypothesized that the MsvR family of proteins were redox-sensitive transcription regulators. Results An MsvR homologue from the methanogen Methanosarcina acetivorans, MaMsvR, was overexpressed and purified. The two MsvR proteins bound the same DNA sequence motif found upstream of all known MsvR encoding genes, but unlike MthMsvR, MaMsvR did not bind the promoters of select genes involved in the oxidative stress response. Unlike MthMsvR that bound DNA under both non-reducing and reducing conditions, MaMsvR bound DNA only under reducing conditions. MaMsvR appeared as a dimer in gel filtration chromatography analysis and site-directed mutagenesis suggested that conserved cysteine residues within the V4R domain were involved in conformational rearrangements that impact DNA binding. Conclusions Results presented herein suggest that homodimeric MaMsvR acts as a transcriptional repressor by binding Ma PmsvR under non-reducing conditions. Changing redox conditions promote conformational changes that abrogate binding to Ma PmsvR which likely leads to de-repression.
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Affiliation(s)
- Catherine E Isom
- Department of Microbiology and Plant Biology, University of Oklahoma, 770 Van Vleet Oval, Norman, OK, 73019, USA
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21
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Seifert AH, Rittmann S, Bernacchi S, Herwig C. Method for assessing the impact of emission gasses on physiology and productivity in biological methanogenesis. BIORESOURCE TECHNOLOGY 2013; 136:747-51. [PMID: 23582218 DOI: 10.1016/j.biortech.2013.03.119] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2013] [Revised: 03/11/2013] [Accepted: 03/15/2013] [Indexed: 05/07/2023]
Abstract
This contribution presents a method for quantification of the impact of emission gasses on the methane production with hydrogenotrophic methanogenic archaea. The developed method allows a robust quantification of the influence of real gasses on the volumetric productivity of methanogenic cultures by uncoupling physiological and mass transfer effects. This is achieved over reference experiments with pure H2 and CO2, simulating the mass transfer influence of the non-convertible side components by addition of N2 to the reactant stream. Furthermore, this method was used to examine the performance of Methanothermobacter marburgensis on different emission gasses. None of the present side components had a negative effect on the volumetric methane production rate. The presented method showed to be ready to use as a generic tool for feasibility studies and quantification of the physiological impact regarding the use of exhaust gasses as reactant gas for the biological methanogenesis.
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Affiliation(s)
- A H Seifert
- Vienna University of Technology, Institute of Chemical Engineering, Research Area Biochemical Engineering, Gumpendorferstrasse 1a, 1060 Vienna, Austria
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Grossart HP, Frindte K, Dziallas C, Eckert W, Tang KW. Microbial methane production in oxygenated water column of an oligotrophic lake. Proc Natl Acad Sci U S A 2011; 108:19657-61. [PMID: 22089233 PMCID: PMC3241779 DOI: 10.1073/pnas.1110716108] [Citation(s) in RCA: 113] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
The prevailing paradigm in aquatic science is that microbial methanogenesis happens primarily in anoxic environments. Here, we used multiple complementary approaches to show that microbial methane production could and did occur in the well-oxygenated water column of an oligotrophic lake (Lake Stechlin, Germany). Oversaturation of methane was repeatedly recorded in the well-oxygenated upper 10 m of the water column, and the methane maxima coincided with oxygen oversaturation at 6 m. Laboratory incubations of unamended epilimnetic lake water and inoculations of photoautotrophs with a lake-enrichment culture both led to methane production even in the presence of oxygen, and the production was not affected by the addition of inorganic phosphate or methylated compounds. Methane production was also detected by in-lake incubations of lake water, and the highest production rate was 1.8-2.4 nM⋅h(-1) at 6 m, which could explain 33-44% of the observed ambient methane accumulation in the same month. Temporal and spatial uncoupling between methanogenesis and methanotrophy was supported by field and laboratory measurements, which also helped explain the oversaturation of methane in the upper water column. Potentially methanogenic Archaea were detected in situ in the oxygenated, methane-rich epilimnion, and their attachment to photoautotrophs might allow for anaerobic growth and direct transfer of substrates for methane production. Specific PCR on mRNA of the methyl coenzyme M reductase A gene revealed active methanogenesis. Microbial methane production in oxygenated water represents a hitherto overlooked source of methane and can be important for carbon cycling in the aquatic environments and water to air methane flux.
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Affiliation(s)
- Hans-Peter Grossart
- Department of Limnology of Stratified Lakes, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, D-16775 Stechlin, Germany.
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Widespread disulfide bonding in proteins from thermophilic archaea. ARCHAEA-AN INTERNATIONAL MICROBIOLOGICAL JOURNAL 2011; 2011:409156. [PMID: 21941460 PMCID: PMC3177088 DOI: 10.1155/2011/409156] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/17/2011] [Accepted: 07/16/2011] [Indexed: 11/17/2022]
Abstract
Disulfide bonds are generally not used to stabilize proteins in the cytosolic compartments of bacteria or eukaryotic cells, owing to the chemically reducing nature of those environments. In contrast, certain thermophilic archaea use disulfide bonding as a major mechanism for protein stabilization. Here, we provide a current survey of completely sequenced genomes, applying computational methods to estimate the use of disulfide bonding across the Archaea. Microbes belonging to the Crenarchaeal branch, which are essentially all hyperthermophilic, are universally rich in disulfide bonding while lesser degrees of disulfide bonding are found among the thermophilic Euryarchaea, excluding those that are methanogenic. The results help clarify which parts of the archaeal lineage are likely to yield more examples and additional specific data on protein disulfide bonding, as increasing genomic sequencing efforts are brought to bear.
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Abstract
Methane is the most abundant hydrocarbon in the atmosphere, and it is an important greenhouse gas, which has so far contributed an estimated 20% of postindustrial global warming. A great deal of biogeochemical research has focused on the causes and effects of the variation in global fluxes of methane throughout earth's history, but the underlying microbial processes and their key agents remain poorly understood. This is a disturbing knowledge gap because 85% of the annual global methane production and about 60% of its consumption are based on microbial processes. Only three key functional groups of microorganisms of limited diversity regulate the fluxes of methane on earth, namely the aerobic methanotrophic bacteria, the methanogenic archaea, and their close relatives, the anaerobic methanotrophic archaea (ANME). The ANME represent special lines of descent within the Euryarchaeota and appear to gain energy exclusively from the anaerobic oxidation of methane (AOM), with sulfate as the final electron acceptor according to the net reaction: CH(4) + SO(42-) ---> HCO(3-) + HS(-) + H(2)O. This review summarizes what is known and unknown about AOM on earth and its key catalysts, the ANME clades and their bacterial partners.
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Affiliation(s)
- Katrin Knittel
- Max Planck Institute for Marine Microbiology, Bremen 28359, Germany.
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Liu CT, Miyaki T, Aono T, Oyaizu H. Evaluation of methanogenic strains and their ability to endure aeration and water stress. Curr Microbiol 2007; 56:214-8. [PMID: 17990030 DOI: 10.1007/s00284-007-9059-7] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2007] [Accepted: 09/08/2007] [Indexed: 10/22/2022]
Abstract
During periods of drainage, both water stress and oxygen can cause damage to indigenous methanogens. In the present study, we evaluated the tolerance of seven methanogenic strains (Methanobrevibacter arboriphilicus, Methanobacterium formicicum, Methanococcus vannielii, Methanospirillum hungatei, Methanoculleus olentangyi, Methanoplanus limicola, and Methanosarcina mazei) to long-term exposure to air/nitrogen and drying. We found that these methanogenic strains except for M. limicola and M. olentangyi in pre-dried cells offered more tenacious resistance to desiccation and oxygen exposure than those in enriched liquid cultures. In the case of M. formicicum, the liquid culture of this strain could remain viable when mixed well with fresh or sterile soil, but not when cultured without soil, or with agar slurry. These results suggest that indigenous methanogens localize within soil compartments to protect themselves from the damage caused by gradual drying under an oxic atmosphere.
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Affiliation(s)
- Chi-Te Liu
- Biotechnology Research Center, The University of Tokyo, 1-1-1 Yayoi, Tokyo 113-8657, Japan
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Affiliation(s)
- K F Jarrell
- Department of Microbiology and Immunology, Queen's University, Kingston, Ontario, Canada
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