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Liu R, Mao Z, Liu W, Wang Y, Cheng H, Zhou H, Zhao K. Selective removal of cobalt and copper from Fe (III)-enriched high-pressure acid leach residue using the hybrid bioleaching technique. JOURNAL OF HAZARDOUS MATERIALS 2020; 384:121462. [PMID: 31694776 DOI: 10.1016/j.jhazmat.2019.121462] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2019] [Revised: 10/10/2019] [Accepted: 10/10/2019] [Indexed: 06/10/2023]
Abstract
Removal of metals from high pressure acid leaching (HPAL) residue was essential to alleviate potential environmental threat and avoid valuable metals loss. However, cost-effective metals extraction from HPAL residue remains a difficulty. In this study, a hybrid bioleaching process was developed for Co and Cu extraction from HPAL residue of Cu-Co sulfide ores. Results for microbial community structure optimization showed that moderate thermophilum consortium with coexistence of iron oxidizer and sulfur oxidizer was more efficient on metal extraction compared with mesophiles. Further addition of citric acid, Fe (II) and S0 significantly enhanced the release of metals through improving the total biomass, attached cells and community diversity. As a result, 87.91% of cobalt and 58.52% of copper were extracted at initial pH 1.4 and pulp density of 50 g/L by hybrid bioleaching. The hazardous potential assessments revealed that the bioleached residue could be disposed safely. These findings demonstrated that organic acids assisting bioleaching with community adjusting was a promising strategy for metals removal from HPAL residue.
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Affiliation(s)
- Ronghui Liu
- School of Minerals Processing and Bioengineering, Central South University, Changsha, China; Key Laboratory of Biometallurgy of Ministry of Education, ChangSha 410083, China
| | - Zhenhua Mao
- School of Minerals Processing and Bioengineering, Central South University, Changsha, China
| | - Wenxian Liu
- School of Minerals Processing and Bioengineering, Central South University, Changsha, China
| | - Yuguang Wang
- School of Minerals Processing and Bioengineering, Central South University, Changsha, China; Key Laboratory of Biometallurgy of Ministry of Education, ChangSha 410083, China
| | - Haina Cheng
- School of Minerals Processing and Bioengineering, Central South University, Changsha, China; Key Laboratory of Biometallurgy of Ministry of Education, ChangSha 410083, China.
| | - Hongbo Zhou
- School of Minerals Processing and Bioengineering, Central South University, Changsha, China; Key Laboratory of Biometallurgy of Ministry of Education, ChangSha 410083, China.
| | - Kaifang Zhao
- Dongguan Kecheng Environmental Technology Co., LTD, Dongguan, China
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2
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Abstract
Bacterial communities’ composition, activity and robustness determines the effectiveness of biofiltration units for the desulfurization of biogas. It is therefore important to get a better understanding of the bacterial communities that coexist in biofiltration units under different operational conditions for the removal of H2S, the main reduced sulfur compound to eliminate in biogas. This review presents the main characteristics of sulfur-oxidizing chemotrophic bacteria that are the base of the biological transformation of H2S to innocuous products in biofilters. A survey of the existing biofiltration technologies in relation to H2S elimination is then presented followed by a review of the microbial ecology studies performed to date on biotrickling filter units for the treatment of H2S in biogas under aerobic and anoxic conditions.
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Proposal of the reverse flow model for the origin of the eukaryotic cell based on comparative analyses of Asgard archaeal metabolism. Nat Microbiol 2019; 4:1138-1148. [DOI: 10.1038/s41564-019-0406-9] [Citation(s) in RCA: 106] [Impact Index Per Article: 21.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Accepted: 02/08/2019] [Indexed: 11/08/2022]
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D'Souza G, Shitut S, Preussger D, Yousif G, Waschina S, Kost C. Ecology and evolution of metabolic cross-feeding interactions in bacteria. Nat Prod Rep 2018; 35:455-488. [PMID: 29799048 DOI: 10.1039/c8np00009c] [Citation(s) in RCA: 241] [Impact Index Per Article: 40.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Literature covered: early 2000s to late 2017Bacteria frequently exchange metabolites with other micro- and macro-organisms. In these often obligate cross-feeding interactions, primary metabolites such as vitamins, amino acids, nucleotides, or growth factors are exchanged. The widespread distribution of this type of metabolic interactions, however, is at odds with evolutionary theory: why should an organism invest costly resources to benefit other individuals rather than using these metabolites to maximize its own fitness? Recent empirical work has shown that bacterial genotypes can significantly benefit from trading metabolites with other bacteria relative to cells not engaging in such interactions. Here, we will provide a comprehensive overview over the ecological factors and evolutionary mechanisms that have been identified to explain the evolution and maintenance of metabolic mutualisms among microorganisms. Furthermore, we will highlight general principles that underlie the adaptive evolution of interconnected microbial metabolic networks as well as the evolutionary consequences that result for cells living in such communities.
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Affiliation(s)
- Glen D'Souza
- Department of Environmental Systems Sciences, ETH-Zürich, Zürich, Switzerland
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6
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Weisener CG, Reid T. Combined imaging and molecular techniques for evaluating microbial function and composition: A review. SURF INTERFACE ANAL 2017. [DOI: 10.1002/sia.6317] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Christopher G. Weisener
- The University of Windsor Ontario-Great Lakes Institute for Environmental Research; 401 Sunset Avenue N9B3P4 Windsor ON Canada
| | - Thomas Reid
- The University of Windsor Ontario-Great Lakes Institute for Environmental Research; 401 Sunset Avenue N9B3P4 Windsor ON Canada
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7
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Measuring spectroscopy and magnetism of extracted and intracellular magnetosomes using soft X-ray ptychography. Proc Natl Acad Sci U S A 2016; 113:E8219-E8227. [PMID: 27930297 DOI: 10.1073/pnas.1610260114] [Citation(s) in RCA: 62] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Characterizing the chemistry and magnetism of magnetotactic bacteria (MTB) is an important aspect of understanding the biomineralization mechanism and function of the chains of magnetosomes (Fe3O4 nanoparticles) found in such species. Images and X-ray absorption spectra (XAS) of magnetosomes extracted from, and magnetosomes in, whole Magnetovibrio blakemorei strain MV-1 cells have been recorded using soft X-ray ptychography at the Fe 2p edge. A spatial resolution of 7 nm is demonstrated. Precursor-like and immature magnetosome phases in a whole MV-1 cell were visualized, and their Fe 2p spectra were measured. Based on these results, a model for the pathway of magnetosome biomineralization for MV-1 is proposed. Fe 2p X-ray magnetic circular dichroism (XMCD) spectra have been derived from ptychography image sequences recorded using left and right circular polarization. The shape of the XAS and XMCD signals in the ptychographic absorption spectra of both sample types is identical to the shape and signals measured with conventional bright-field scanning transmission X-ray microscope. A weaker and inverted XMCD signal was observed in the ptychographic phase spectra of the extracted magnetosomes. The XMCD ptychographic phase spectrum of the intracellular magnetosomes differed from the ptychographic phase spectrum of the extracted magnetosomes. These results demonstrate that spectro-ptychography offers a superior means of characterizing the chemical and magnetic properties of MTB at the individual magnetosome level.
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An oligotrophic deep-subsurface community dependent on syntrophy is dominated by sulfur-driven autotrophic denitrifiers. Proc Natl Acad Sci U S A 2016; 113:E7927-E7936. [PMID: 27872277 DOI: 10.1073/pnas.1612244113] [Citation(s) in RCA: 87] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Subsurface lithoautotrophic microbial ecosystems (SLiMEs) under oligotrophic conditions are typically supported by H2 Methanogens and sulfate reducers, and the respective energy processes, are thought to be the dominant players and have been the research foci. Recent investigations showed that, in some deep, fluid-filled fractures in the Witwatersrand Basin, South Africa, methanogens contribute <5% of the total DNA and appear to produce sufficient CH4 to support the rest of the diverse community. This paradoxical situation reflects our lack of knowledge about the in situ metabolic diversity and the overall ecological trophic structure of SLiMEs. Here, we show the active metabolic processes and interactions in one of these communities by combining metatranscriptomic assemblies, metaproteomic and stable isotopic data, and thermodynamic modeling. Dominating the active community are four autotrophic β-proteobacterial genera that are capable of oxidizing sulfur by denitrification, a process that was previously unnoticed in the deep subsurface. They co-occur with sulfate reducers, anaerobic methane oxidizers, and methanogens, which each comprise <5% of the total community. Syntrophic interactions between these microbial groups remove thermodynamic bottlenecks and enable diverse metabolic reactions to occur under the oligotrophic conditions that dominate in the subsurface. The dominance of sulfur oxidizers is explained by the availability of electron donors and acceptors to these microorganisms and the ability of sulfur-oxidizing denitrifiers to gain energy through concomitant S and H2 oxidation. We demonstrate that SLiMEs support taxonomically and metabolically diverse microorganisms, which, through developing syntrophic partnerships, overcome thermodynamic barriers imposed by the environmental conditions in the deep subsurface.
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Wilbanks EG, Jaekel U, Salman V, Humphrey PT, Eisen JA, Facciotti MT, Buckley DH, Zinder SH, Druschel GK, Fike DA, Orphan VJ. Microscale sulfur cycling in the phototrophic pink berry consortia of the Sippewissett Salt Marsh. Environ Microbiol 2014; 16:3398-415. [PMID: 24428801 PMCID: PMC4262008 DOI: 10.1111/1462-2920.12388] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2013] [Revised: 12/30/2013] [Accepted: 01/05/2014] [Indexed: 11/27/2022]
Abstract
Microbial metabolism is the engine that drives global biogeochemical cycles, yet many key transformations are carried out by microbial consortia over short spatiotemporal scales that elude detection by traditional analytical approaches. We investigate syntrophic sulfur cycling in the 'pink berry' consortia of the Sippewissett Salt Marsh through an integrative study at the microbial scale. The pink berries are macroscopic, photosynthetic microbial aggregates composed primarily of two closely associated species: sulfide-oxidizing purple sulfur bacteria (PB-PSB1) and sulfate-reducing bacteria (PB-SRB1). Using metagenomic sequencing and (34) S-enriched sulfate stable isotope probing coupled with nanoSIMS, we demonstrate interspecies transfer of reduced sulfur metabolites from PB-SRB1 to PB-PSB1. The pink berries catalyse net sulfide oxidation and maintain internal sulfide concentrations of 0-500 μm. Sulfide within the berries, captured on silver wires and analysed using secondary ion mass spectrometer, increased in abundance towards the berry interior, while δ(34) S-sulfide decreased from 6‰ to -31‰ from the exterior to interior of the berry. These values correspond to sulfate-sulfide isotopic fractionations (15-53‰) consistent with either sulfate reduction or a mixture of reductive and oxidative metabolisms. Together this combined metagenomic and high-resolution isotopic analysis demonstrates active sulfur cycling at the microscale within well-structured macroscopic consortia consisting of sulfide-oxidizing anoxygenic phototrophs and sulfate-reducing bacteria.
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Affiliation(s)
- Elizabeth G Wilbanks
- Department of Department of Microbiology Graduate Group, University of CaliforniaDavis, CA, 95616, USA
| | - Ulrike Jaekel
- Department of Evolution and Ecology, University of CaliforniaDavis, CA, 95616, USA
- Department of Microbiology and Immunology, University of CaliforniaDavis, CA, 95616, USA
| | - Verena Salman
- Department of Biomedical Engineering, University of CaliforniaDavis, CA, 95616, USA
| | - Parris T Humphrey
- UC Davis Genome Center, University of CaliforniaDavis, CA, 95616, USA
| | - Jonathan A Eisen
- Arctic Technology, Shell Technology NorwayOslo, N-0277, Norway
- Department of Organismic and Evolutionary Biology, Harvard UniversityCambridge, MA, 02138, USA
- Department of Marine Sciences, University of North Carolina at Chapel HillChapel Hill, NC, 27599, USA
| | - Marc T Facciotti
- Department of Marine Sciences, University of North Carolina at Chapel HillChapel Hill, NC, 27599, USA
- Ecology and Evolutionary Biology, University of ArizonaTucson, AZ, 85721, USA
| | - Daniel H Buckley
- Crop and Soil Sciences, Cornell UniversityIthaca, NY, 14853, USA
| | - Stephen H Zinder
- Department of Microbiology, Cornell UniversityIthaca, NY, 14853, USA
| | - Gregory K Druschel
- Department of Earth Sciences, Indiana University-Purdue UniversityIndianapolis, IN, 46202, USA
| | - David A Fike
- Department of Earth and Planetary Sciences, Washington UniversitySt. Louis, MO, 63130, USA
| | - Victoria J Orphan
- Division of Geological and Planetary Sciences, California Institute of TechnologyPasadena, CA, 91125, USA
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Segawa T, Ishii S, Ohte N, Akiyoshi A, Yamada A, Maruyama F, Li Z, Hongoh Y, Takeuchi N. The nitrogen cycle in cryoconites: naturally occurring nitrification-denitrification granules on a glacier. Environ Microbiol 2014; 16:3250-62. [DOI: 10.1111/1462-2920.12543] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2013] [Accepted: 06/13/2014] [Indexed: 11/29/2022]
Affiliation(s)
- Takahiro Segawa
- National Institute of Polar Research; Tokyo Japan
- Transdisciplinary Research Integration Center; Tokyo Japan
| | - Satoshi Ishii
- Division of Environmental Engineering; Hokkaido University; Sapporo Japan
| | - Nobuhito Ohte
- Laboratory of Forest Hydrology and Erosion Control Engineering; Department of Forest Science; Graduate School of Agricultural and Life Sciences; The University of Tokyo; Tokyo Japan
| | - Ayumi Akiyoshi
- National Institute of Polar Research; Tokyo Japan
- Transdisciplinary Research Integration Center; Tokyo Japan
| | - Akinori Yamada
- Department of Biological Sciences; Tokyo Institute of Technology; Tokyo Japan
- Graduate School of Fisheries Science and Environmental Studies; Nagasaki University; Nagasaki Japan
| | - Fumito Maruyama
- Department of Microbiology; Graduate School of Medicine; Kyoto University; Kyoto Japan
| | - Zhongqin Li
- Laboratory of Cryosphere and Environment/Tien Shan Glaciological Station; Cold and Arid Regions Environmental and Engineering Research Institute; Chinese Academy of Sciences; Lanzhou China
| | - Yuichi Hongoh
- Department of Biological Sciences; Tokyo Institute of Technology; Tokyo Japan
| | - Nozomu Takeuchi
- Department of Earth Sciences; Graduate School of Science; Chiba University; Chiba Japan
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11
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Obst M, Schmid G. 3D chemical mapping: application of scanning transmission (soft) X-ray microscopy (STXM) in combination with angle-scan tomography in bio-, geo-, and environmental sciences. Methods Mol Biol 2014; 1117:757-781. [PMID: 24357389 DOI: 10.1007/978-1-62703-776-1_34] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The identification of environmental processes and mechanisms often requires information on the organochemical and inorganic composition of specimens at high spatial resolution. X-ray spectroscopy (XAS) performed in the soft X-ray range (100-2,200 eV) provides chemical speciation information for elements that are of high biogeochemical relevance such as carbon, nitrogen, and oxygen but also includes transition metals such as iron, manganese, or nickel. Synchrotron-based scanning transmission X-ray microscopy (STXM) combines XAS with high resolution mapping on the 20-nm scale. This provides two-dimensional (2D) quantitative information about the distribution of chemical species such as organic macromolecules, metals, or mineral phases within environmental samples. Furthermore, the combination of STXM with angle-scan tomography allows for three-dimensional (3D) spectromicroscopic analysis of bio-, geo-, or environmental samples. For the acquisition of STXM tomography data, the sample is rotated around an axis perpendicular to the X-ray beam. Various sample preparation approaches such as stripes cut from TEM grids or the preparation of wet cells allow for preparing environmentally relevant specimens in a dry or in a fully hydrated state for 2D and 3D STXM measurements. In this chapter we give a short overview about the principles of STXM, its application to environmental sciences, different preparation techniques, and the analysis and 3D reconstruction of STXM tomography data.
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Affiliation(s)
- Martin Obst
- Center for Applied Geoscience, University of Tuebingen, Tuebingen, Germany
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12
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Behyan S, Hu Y, Urquhart SG. Chemical sensitivity of sulfur 1s NEXAFS spectroscopy I: Speciation of sulfoxides and sulfones. Chem Phys Lett 2014. [DOI: 10.1016/j.cplett.2013.10.026] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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13
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Montebello AM, Bezerra T, Rovira R, Rago L, Lafuente J, Gamisans X, Campoy S, Baeza M, Gabriel D. Operational aspects, pH transition and microbial shifts of a H2S desulfurizing biotrickling filter with random packing material. CHEMOSPHERE 2013; 93:2675-2682. [PMID: 24041568 DOI: 10.1016/j.chemosphere.2013.08.052] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2013] [Revised: 08/12/2013] [Accepted: 08/15/2013] [Indexed: 06/02/2023]
Abstract
Pall rings, a common random packing material, were used in the biotrickling filtration of biogas with high H2S. Assessment of 600d of operation covered the reactor start-up, the operation at neutral pH and the transition from neutral to acid pH. During the start-up period, operational parameters such as the aeration rate and the trickling liquid velocity were optimized. During the steady-state operation at neutral pH, the performance of the random packing material was investigated by reducing the gas contact time at both constant and increasing H2S loads. The random packing material showed similar elimination capacities and removal efficiencies in comparison with previous studies with a structured packing material, indicating that Pall rings are suitable for biogas desulfurization in biotrickling filters. The diversity of Eubacteria and the structure of the community were investigated before and after the pH transition using the bacterial tag-encoded FLX amplicon pyrosequencing. The pH transition to acid pH drastically reduced the microbial diversity and produced a progressive specialization of the sulfur-oxidizing bacteria community without any detrimental effect on the overall desulfurizing capacity of the reactor. During acidic pH operation, a persistent accumulation of elemental sulfur was found.
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Affiliation(s)
- Andrea M Montebello
- Department of Chemical Engineering, School of Engineering, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
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Behyan S, Hu Y, Urquhart SG. Sulfur 1s near edge x-ray absorption fine structure spectroscopy of thiophenic and aromatic thioether compounds. J Chem Phys 2013; 138:214302. [PMID: 23758366 DOI: 10.1063/1.4807604] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Thiophenic compounds are major constituents of fossil fuels and pose problems for fuel refinement. The quantification and speciation of these compounds is of great interest in different areas such as biology, fossil fuels studies, geology, and archaeology. Sulfur 1s Near-Edge X-ray Absorption Fine Structure (NEXAFS) spectroscopy has emerged as a qualitative and quantitative method for sulfur speciation. A firm understanding of the sulfur 1s NEXAFS spectra of organosulfur species is required for these analytical studies. To support this development, the sulfur 1s NEXAFS spectra of simple thiols and thioethers were previously examined, and are now extended to studies of thiophenic and aromatic thioether compounds, in the gas and condensed phases. High-resolution spectra have been further analyzed with the aid of Improved Virtual Orbital (IVO) and Δ(self-consistent field) ab initio calculations. Experimental sulfur 1s NEXAFS spectra show fine features predicted by calculation, and the combination of experiment and calculation has been used to improve the assignment of spectroscopic features important for the speciation and quantification of sulfur compounds. Systematic differences between gas and condensed phases are also explored; these differences suggest a significant role for conformational effects in the NEXAFS spectra of condensed species.
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Affiliation(s)
- Shirin Behyan
- Department of Chemistry, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5C9, Canada
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15
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Preston J, Watts JEM, Jones M. Novel bacterial community associated with 500-year-old unpreserved archaeological wood from King Henry VIII's Tudor Warship the Mary Rose. Appl Environ Microbiol 2012; 78:8822-8. [PMID: 23023757 PMCID: PMC3502903 DOI: 10.1128/aem.02387-12] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2012] [Accepted: 09/22/2012] [Indexed: 02/01/2023] Open
Abstract
A 500-year-old unpreserved Mary Rose sample, historically containing an iron bolt, was analyzed using enrichment cultures and 16S sequencing. The novel community of bacteria present demonstrates a biological pathway of Fe and S oxidation and a range of acid-generating metabolisms, with implications for preservation and biogeochemical cycling.
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Affiliation(s)
- Joanne Preston
- University of Portsmouth, School of Biological Sciences, Portsmouth, Hants, United Kingdom.
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16
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Sieber JR, McInerney MJ, Gunsalus RP. Genomic insights into syntrophy: the paradigm for anaerobic metabolic cooperation. Annu Rev Microbiol 2012; 66:429-52. [PMID: 22803797 DOI: 10.1146/annurev-micro-090110-102844] [Citation(s) in RCA: 313] [Impact Index Per Article: 26.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Syntrophy is a tightly coupled mutualistic interaction between hydrogen-/formate-producing and hydrogen-/formate-using microorganisms that occurs throughout the microbial world. Syntrophy is essential for global carbon cycling, waste decomposition, and biofuel production. Reverse electron transfer, e.g., the input of energy to drive critical redox reactions, is a defining feature of syntrophy. Genomic analyses indicate multiple systems for reverse electron transfer, including ion-translocating ferredoxin:NAD(+) oxidoreductase and hydrogenases, two types of electron transfer flavoprotein:quinone oxidoreductases, and other quinone reactive complexes. Confurcating hydrogenases that couple the favorable production of hydrogen from reduced ferredoxin with the unfavorable production of hydrogen from NADH are present in almost all syntrophic metabolizers, implicating their critical role in syntrophy. Transcriptomic analysis shows upregulation of many genes without assigned functions in the syntrophic lifestyle. High-throughput technologies provide insight into the mechanisms used to establish and maintain syntrophic consortia and conserve energy from reactions that operate close to thermodynamic equilibrium.
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Affiliation(s)
- Jessica R Sieber
- Department of Botany and Microbiology, University of Oklahoma, Norman, 73019, USA.
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17
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Behrens S, Kappler A, Obst M. Linking environmental processes to thein situfunctioning of microorganisms by high-resolution secondary ion mass spectrometry (NanoSIMS) and scanning transmission X-ray microscopy (STXM). Environ Microbiol 2012; 14:2851-69. [DOI: 10.1111/j.1462-2920.2012.02724.x] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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18
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Behyan S, Hu Y, Urquhart SG. Sulfur 1s near-edge x-ray absorption fine structure (NEXAFS) of thiol and thioether compounds. J Chem Phys 2011; 134:244304. [DOI: 10.1063/1.3602218] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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19
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Plach JM, Elliott AVC, Droppo IG, Warren LA. Physical and ecological controls on freshwater floc trace metal dynamics. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2011; 45:2157-2164. [PMID: 21322631 DOI: 10.1021/es1031745] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Significantly higher concentrations of Ag, As, Cu, Co, Ni, and Pb are found in suspended floc compared to surficial bed sediments for a freshwater beach in Lake Ontario. Contrasting observed element-specific bed sediment metal partitioning patterns, floc sequestration for all elements is dominated by one substrate: amorphous oxyhydroxides. More specifically, floc metal scavenging is controlled by floc biogeochemical architecture. Floc organics, largely living microbial cells and associated exopolymeric substances (EPS), act as scaffolds for the collection and/or templating of amorphous Fe oxyhydroxides. While interactions between floc organics and amorphous Fe oxyhydroxides affected floc sorption behavior, specific element affinities and competition for these limited substrates was important for overall floc partitioning. Further, assessment of metal dynamics during stormy conditions indicated energy-regime driven shifts in floc and bed sediment partitioning that were specifically linked to the exchange of floc and bed sedimentary materials. These novel results demonstrate that the microbial nature of floc formation exerts an important control on floc metal dynamics distinguishable from surficial bed sediments and that hydrologic energy-regime is an important factor to consider in overall floc metal behavior, especially in beach environments.
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Affiliation(s)
- Janina M Plach
- School of Geography and Earth Sciences, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4K1, Canada
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Abstract
Isolated, clonal populations of cells are rarely found in nature. The emergent properties of microbial consortia present a challenge for the systems approach to biology, as chances for competition, communication, or collaboration multiply with the number of interacting agents. This review focuses on recent work on intercourse within biofilms, among quorum-sensing populations, and between cross-feeding metabolic cooperators. New tools from synthetic biology allow microbial interactions to be designed and tightly controlled, creating valuable model systems. We address both natural and synthetic partnerships, with an emphasis on how system behaviors derive from the properties of their components. Essential features of microbial biology arose in the context of a very mixed culture and cannot be understood without unscrambling it.
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Affiliation(s)
- Edwin H Wintermute
- Department of Systems Biology, Harvard Medical School, Boston, Massachusetts 02115, USA
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