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Xiuzhu Dong - One of the best experts on this subject based on the ideXlab platform.
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methanoculleus hydrogenitrophicus sp nov a methanogenic archaeon isolated from Wetland Soil
International Journal of Systematic and Evolutionary Microbiology, 2010Co-Authors: Jianqing Tian, Yanfen Wang, Xiuzhu DongAbstract:National Nature Science Foundation [30830007, 30621005]; Chinese Academy of Sciences [kzcx2-yw-418-03]
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Methanoculleus hydrogenitrophicus sp. nov., a methanogenic archaeon isolated from Wetland Soil.
International journal of systematic and evolutionary microbiology, 2009Co-Authors: Jianqing Tian, Yanfen Wang, Xiuzhu DongAbstract:An obligately anaerobic, methanogenic archaeon, strain HC(T), was isolated from Soil of the Zoige Wetland on the Tibetan plateau, China. The strain was isolated through construction of an artificial butyrate-degrading consortium in co-culture with a syntrophic bacterium, 'Syntrophomonas erecta subsp. sporosyntropha' JCM 13344. Cells of strain HC(T) were irregular coccoids, 0.8-2 mum in diameter, that occurred singly and utilized only H(2)/CO(2) for growth and methane production. Growth occurred at 18-45 degrees C (optimum around 37 degrees C). The pH for growth was 5.0-8.5 (optimal growth around pH 6.6). The G+C content of the genomic DNA was 60.2 mol%. 16S rRNA gene sequence analysis indicated that strain HC(T) was affiliated to the genus Methanoculleus, with sequence similarities of 94.8-97.2 % to existing members. However, strain HC(T) was distinguished from described Methanoculleus species by not using formate for growth or methane formation and not requiring acetate as a growth factor. On the basis of phylogenetic analysis and phenotypic characteristics, the novel species Methanoculleus hydrogenitrophicus sp. nov. is proposed, with strain HC(T) (=CGMCC 1.5146(T) =JCM 16311(T)) as the type strain.
Baoshan Xing - One of the best experts on this subject based on the ideXlab platform.
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biochar induced negative carbon mineralization priming effects in a coastal Wetland Soil roles of Soil aggregation and microbial modulation
Science of The Total Environment, 2018Co-Authors: Hao Zheng, Xiao Wang, Zhenyu Wang, Baoshan XingAbstract:Abstract Biochar can sequestrate carbon (C) in Soils and affect native Soil organic carbon (SOC) mineralization via priming effects. However, the roles of Soil aggregation and microbial regulation in priming effects of biochars on SOC in coastal Wetland Soils are poorly understood. Thus, a coastal Wetland Soil (δ13C − 22‰) was separated into macro-micro aggregates (53–2000 μm, MA) and silt-clay fractions (
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biochar addition reduced net n mineralization of a coastal Wetland Soil in the yellow river delta china
Geoderma, 2016Co-Authors: Lei Chen, Hao Zheng, Zhenyu Wang, Jingjing Chang, Hefang Wang, Baoshan XingAbstract:Abstract Soil degradation has seriously threatened global Soil and food security. Biochar application is a promising management option to remediate the degraded Soils. However, extensive application of biochar is limited by lack of understanding the effects of biochar on nitrogen (N) mineralization in the degraded coastal Wetland Soils. Therefore, the individual or combined effects of biochar, reed stem and urea fertilizer application on N mineralization in a coastal Wetland Soil were investigated using a 150-days incubation experiment, and the underlying mechanisms were discussed. Biochar addition reduced net N mineralization, but no significant effect was observed between the treatments with different addition rates. The combined addition of the biochar and reed stem had little effect on net N mineralization because of the higher C:N ratio (45.5–49.3). However, biochar addition in combination with the urea fertilizer initially decreased net N mineralization, but slightly increased it later on. The biochar-induced reduction of net N mineralization was mainly ascribed to the increased C:N ratio and decreased urease activity. Therefore, adding N fertilizer to the biochar to enhance the delivery of N prior to its incorporation into Soil, which may avoid N immobilization due to N deficiency, could be an effective strategy for remediating the degraded coastal Wetland Soils.
Jianqing Tian - One of the best experts on this subject based on the ideXlab platform.
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methanoculleus hydrogenitrophicus sp nov a methanogenic archaeon isolated from Wetland Soil
International Journal of Systematic and Evolutionary Microbiology, 2010Co-Authors: Jianqing Tian, Yanfen Wang, Xiuzhu DongAbstract:National Nature Science Foundation [30830007, 30621005]; Chinese Academy of Sciences [kzcx2-yw-418-03]
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Methanoculleus hydrogenitrophicus sp. nov., a methanogenic archaeon isolated from Wetland Soil.
International journal of systematic and evolutionary microbiology, 2009Co-Authors: Jianqing Tian, Yanfen Wang, Xiuzhu DongAbstract:An obligately anaerobic, methanogenic archaeon, strain HC(T), was isolated from Soil of the Zoige Wetland on the Tibetan plateau, China. The strain was isolated through construction of an artificial butyrate-degrading consortium in co-culture with a syntrophic bacterium, 'Syntrophomonas erecta subsp. sporosyntropha' JCM 13344. Cells of strain HC(T) were irregular coccoids, 0.8-2 mum in diameter, that occurred singly and utilized only H(2)/CO(2) for growth and methane production. Growth occurred at 18-45 degrees C (optimum around 37 degrees C). The pH for growth was 5.0-8.5 (optimal growth around pH 6.6). The G+C content of the genomic DNA was 60.2 mol%. 16S rRNA gene sequence analysis indicated that strain HC(T) was affiliated to the genus Methanoculleus, with sequence similarities of 94.8-97.2 % to existing members. However, strain HC(T) was distinguished from described Methanoculleus species by not using formate for growth or methane formation and not requiring acetate as a growth factor. On the basis of phylogenetic analysis and phenotypic characteristics, the novel species Methanoculleus hydrogenitrophicus sp. nov. is proposed, with strain HC(T) (=CGMCC 1.5146(T) =JCM 16311(T)) as the type strain.
Mette M Svenning - One of the best experts on this subject based on the ideXlab platform.
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methylocystis rosea sp nov a novel methanotrophic bacterium from arctic Wetland Soil svalbard norway 78 n
International Journal of Systematic and Evolutionary Microbiology, 2006Co-Authors: Ingvild Wartiainen, Anne Grethe Hestnes, Ian R Mcdonald, Mette M SvenningAbstract:A Gram-negative, rod-shaped, non-motile, non-spore-forming, pink-pigmented bacterium, SV97T, was isolated from a Wetland Soil near Ny-Alesund, Svalbard Islands, Norway (78° N). On the basis of 16S rRNA gene sequence similarity, strain SV97T was shown to belong to the Alphaproteobacteria and was highly related to a number of non-characterized Methylocystis strains with GenBank accession nos AJ458507 and AJ458502 (100 %) and AF177299, AJ458510, AJ458467, AJ458471, AJ431384, AJ458475, AJ458484, AJ458501 and AJ458466 (99 %). The most closely related type strains were Methylocystis parvus OBBPT (97·2 %) and Methylocystis echinoides IMET 10491T (97 %). The closest related recognized species within the genus Methylosinus was Methylosinus sporium NCIMB 11126T (96·0 % similarity). Chemotaxonomic and phenotypic data (C18 : 1 ω8 as the major fatty acid, non-motile, no rosette formation) supported the affiliation of strain SV97T to the genus Methylocystis. The results of DNA–DNA hybridization and physiological and biochemical tests allowed genotypic and phenotypic differentiation of strain SV97T from the two recognized Methylocystis species. Strain SV97T therefore represents a novel species, for which the name Methylocystis rosea sp. nov. is proposed, with the type strain SV97T (=DSM 17261T=ATCC BAA-1196T).
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methylobacter tundripaludum sp nov a methane oxidizing bacterium from arctic Wetland Soil on the svalbard islands norway 78 n
International Journal of Systematic and Evolutionary Microbiology, 2006Co-Authors: Ingvild Wartiainen, Anne Grethe Hestnes, Ian R Mcdonald, Mette M SvenningAbstract:A Gram-negative, rod-shaped, non-motile, non-spore forming bacterium (SV96T) was isolated from Wetland Soil near Ny-Alesund, Svalbard. On the basis of 16S rRNA gene sequence similarity, strain SV96T was shown to belong to the Gammaproteobacteria, related to Methylobacter psychrophilus Z-0021T (99·1 %), Methylobacter luteus ATCC 49878T (97·3 %), Methylobacter marinus A45T (97·0 %) and Methylobacter whittenburyi ATCC 51738T (95·8 %); the closest related species within the genus Methylomicrobium with a validly published name was Methylomicrobium album ATCC 33003T (95·0 %). Chemotaxonomic data (including the major fatty acids: 16 : 1ω8, 16 : 1ω7 and 16 : 1ω5t) supported the affiliation of strain SV96T to the genus Methylobacter. The results of DNA–DNA hybridization, physiological and biochemical tests allowed genotypic and phenotypic differentiation of strain SV96T from the four Methylobacter species mentioned above. Strain SV96T therefore represents a novel species, for which the name Methylobacter tundripaludum sp. nov. is proposed (type strain SV96T=DSM 17260T=ATCC BAA-1195T).
Melanie Davranche - One of the best experts on this subject based on the ideXlab platform.
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Rare earth element patterns: A tool for identifying trace metal sources during Wetland Soil reduction
Chemical Geology, 2020Co-Authors: Melanie Davranche, Malgorzata Grybos, Gerard Gruau, Mathieu Pedrot, Remi MarsacAbstract:International audienceIn Wetland Soils, several Soil phases such as Fe(III)-oxyhydroxides, organic matter (OM) or mixed Fe-OM particles can host trace metals which can be subsequently released during Soil reduction. Anoxic and oxic Wetland Soil incubation experiments, combined with analyses of Soil solutions sampled from a natural Wetland during a reduction event, are used to test the possibility that rare earth elements (REE) could be used as a tool to identify the Soil phases contributing to trace metal solubilization. Significant amounts of trace metals (Cu, Cr, Co, Ni and Pb) and REE are released during anoxic incubation of the Wetland Soil, concomitantly with the build-up of high concentrations of Fe(II) and dissolved organic matter (DOM). Rare earth element patterns obtained in the Soil solution exhibit a middle rare earth elements (MREE) downward concavity. The REE pattern obtained from field samples yields the same feature as developed in the Soil solution from an oxic incubation experiment at pH 7 designed to promote Soil OM desorption. By contrast, significantly different REE patterns are obtained in incubation experiments designed to promote chemical reduction of Fe-oxyhydroxides in Soils. The REE pattern displays a continuous REE enrichment from La to Lu. These distinct and recognizable REE signatures allow us to conclude that (i) Soil organic matter is the main source of REE and trace metals during Wetland Soil reduction; (ii) Fe(II) is provided by the reduction of amorphous Fe(III) nanoparticles embedded within the organic matter, which do not bind REE or other trace metals in significant proportions (REE and trace elements being preferentially complexed to organic matter); and finally (iii) REE provide a reliable and powerful tool, suitable for identifying trace metal sources during Wetland Soil reduction
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experimental evidence of ree size fraction redistribution during redox variation in Wetland Soil
Science of The Total Environment, 2018Co-Authors: Helene Guenet, Melanie Davranche, Edwige Demangeat, Delphine Vantelon, Annecatherine Piersonwickmann, Emilie Jarde, Elaheh Lotfi, Jacques JestinAbstract:The evolution of rare earth element (REE) speciation between reducing and oxidizing conditions in a riparian Wetland Soil was studied relative to the size fractionation of the solution. In all size fractions obtained from the reduced and oxidized Soil solutions, the following analyses were carried out: organic matter (OM) characterization, transmission electron microscopy (TEM) observations as well as major and trace element analyses. Significant REE redistribution and speciation evolution between the various size fractions were observed. Under reducing conditions, the REEs were bound to colloidal and dissolved OM ( 2 μm size fraction), colloidal (<2 μm size fraction), organic and Fe-enriched fractions. In the particulate size fraction, the REEs were bound to humic and bacterial OM embedding Fe nano-oxides. The resulting REE pattern showed a strong enrichment in heavy REEs (HREEs) in response to REE binding to specific bacterial OM functional groups. In the largest colloidal size fraction (0.2 μm–30 kDa), the REEs were bound to humic substances (HS). The lowest colloidal size fraction (<30 kDa) is poorly concentrated in the REEs and the REE pattern showed an increase in the middle REEs (MREEs) and heavy REEs (HREEs) corresponding to a low REE loading on HS. A comparison of the REE patterns in the present experimental and field measurements demonstrated that, in riparian Wetlands, under a high-water level, reducing conditions are insufficient to allow for the dissolution of the entire Fe nano-oxide pool formed during the oxidative period. Therefore, even under reducing conditions, Fe(III) seems to remain a potential scavenger of REEs.
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rare earth element patterns a tool for identifying trace metal sources during Wetland Soil reduction
Chemical Geology, 2011Co-Authors: Melanie Davranche, Malgorzata Grybos, Gerard Gruau, Mathieu Pedrot, Remi MarsacAbstract:Abstract In Wetland Soils, several Soil phases such as Fe(III)–oxyhydroxides, organic matter (OM) or mixed Fe–OM particles can host trace metals which can be subsequently released during Soil reduction. Anoxic and oxic Wetland Soil incubation experiments, combined with analyses of Soil solutions sampled from a natural Wetland during a reduction event, are used to test the possibility that rare earth elements (REE) could be used as a tool to identify the Soil phases contributing to trace metal solubilization. Significant amounts of trace metals (Cu, Cr, Co, Ni and Pb) and REE are released during anoxic incubation of the Wetland Soil, concomitantly with the build-up of high concentrations of Fe(II) and dissolved organic matter (DOM). Rare earth element patterns obtained in the Soil solution exhibit a middle rare earth elements (MREE) downward concavity. The REE pattern obtained from field samples yields the same feature as developed in the Soil solution from an oxic incubation experiment at pH 7 designed to promote Soil OM desorption. By contrast, significantly different REE patterns are obtained in incubation experiments designed to promote chemical reduction of Fe–oxyhydroxides in Soils. The REE pattern displays a continuous REE enrichment from La to Lu. These distinct and recognizable REE signatures allow us to conclude that (i) Soil organic matter is the main source of REE and trace metals during Wetland Soil reduction; (ii) Fe(II) is provided by the reduction of amorphous Fe(III) nanoparticles embedded within the organic matter, which do not bind REE or other trace metals in significant proportions (REE and trace elements being preferentially complexed to organic matter); and finally (iii) REE provide a reliable and powerful tool, suitable for identifying trace metal sources during Wetland Soil reduction.
