{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1390282679529818368.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.2343/geochemj.1.0161"}},{"identifier":{"@type":"COI","@value":"1:CAS:528:DC%2BC38XhsVems7rN"}},{"identifier":{"@type":"NDL_BIB_ID","@value":"023829232"}},{"identifier":{"@type":"URI","@value":"http://id.ndl.go.jp/bib/023829232"}},{"identifier":{"@type":"URI","@value":"https://ndlsearch.ndl.go.jp/books/R000000004-I023829232"}},{"identifier":{"@type":"URI","@value":"https://www.jstage.jst.go.jp/article/geochemj/46/3/46_1.0161/_pdf"}},{"identifier":{"@type":"NAID","@value":"10030973363"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@language":"en","@value":"Hydrogen and carbon isotope fractionation by thermophilic hydrogenotrophic methanogens from a deep aquifer under coculture with fermenters"}],"dc:language":"en","description":[{"type":"abstract","notation":[{"@language":"en","@value":"To elucidate the isotope geochemistry of CH<sub>4</sub> production in deep subsurface environments, we investigated the relation between H<sub>2</sub> concentration and hydrogen and carbon isotope fractionation by CO<sub>2</sub> reduction using microbial communities obtained from groundwater in a deep aquifer associated with an accretionary prism. Incubation experiments were conducted under anaerobic culture conditions of two types. In one experiment, a coculture of H<sub>2</sub>-producing fermenters and hydrogenotrophic methanogens was established in groundwater treated with organic substrates. The other experiment used groundwater under H<sub>2</sub> + CO<sub>2</sub> (80:20, v/v) to produce CH<sub>4</sub> under high H<sub>2</sub> concentrations. In the cocultures, H<sub>2</sub> concentrations increased in the initial phases, then decreased gradually and remained low during CH<sub>4</sub> production, indicating H<sub>2</sub> consumption by hydrogenotrophic methanogens to produce CH<sub>4</sub>. This study revealed for the first time that cocultures with fermenters and hydrogenotrophic methanogens producing CH<sub>4</sub> in low H<sub>2</sub> concentration cause smaller hydrogen isotope fractionations (0.663 < α<sub>H</sub> < 0.725) than in monocultures under high H<sub>2</sub> concentrations (0.629 < α<sub>H</sub> < 0.656). Carbon isotope fractionation in cocultures was greater (1.052 < α(CO<sub>2</sub>-CH<sub>4</sub>) < 1.074) than in monocultures under high H<sub>2</sub> concentrations (1.021 < α(CO<sub>2</sub>-CH<sub>4</sub>) < 1.023). The large carbon fractionation was thought to result from low levels of H<sub>2</sub>, supporting the hypothesis of differential reversibility of multiple enzymatic processes in CH<sub>4</sub> production. Although lack of agreement remains between results of incubation experiments and field observations especially in hydrogen isotope fractionations, both hydrogen and carbon isotope fractionation in cocultures were close to the fractionations of field observation in which CO<sub>2</sub> reduction is a dominant pathway in CH<sub>4</sub> production compared with those in monoculture."}],"abstractLicenseFlag":"disallow"}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1420001326213096704","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"70700152"},{"@type":"NRID","@value":"1000070700152"},{"@type":"NRID","@value":"9000258406740"},{"@type":"NRID","@value":"9000399823994"},{"@type":"NRID","@value":"9000388515011"},{"@type":"NRID","@value":"9000019006446"},{"@type":"NRID","@value":"9000394967680"},{"@type":"NRID","@value":"9000370281750"},{"@type":"NRID","@value":"9000411371564"},{"@type":"NRID","@value":"9000378112214"},{"@type":"NRID","@value":"9000019240856"},{"@type":"NRID","@value":"9000394961560"},{"@type":"NRID","@value":"9000411371799"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/shohato"}],"foaf:name":[{"@language":"en","@value":"HATTORI SHOHEI"}],"jpcoar:affiliationName":[{"@language":"en","@value":"Department of Environmental Science and Technology, Interdisciplinary Graduate School of Science and 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J."},{"@language":"ja","@value":"Ｇｅｏｃｈｅｍ．　Ｊ．"}],"dc:publisher":[{"@language":"en","@value":"GEOCHEMICAL SOCIETY OF JAPAN"},{"@language":"ja","@value":"一般社団法人日本地球化学会"}],"prism:publicationDate":"2012-06-20","prism:volume":"46","prism:number":"3","prism:startingPage":"193","prism:endingPage":"200"},"reviewed":"false","dcterms:accessRights":"http://purl.org/coar/access_right/c_abf2","url":[{"@id":"http://id.ndl.go.jp/bib/023829232"},{"@id":"https://ndlsearch.ndl.go.jp/books/R000000004-I023829232"},{"@id":"https://www.jstage.jst.go.jp/article/geochemj/46/3/46_1.0161/_pdf"}],"availableAt":"2012-06-20","foaf:topic":[{"@id":"https://cir.nii.ac.jp/all?q=methane","dc:title":"methane"},{"@id":"https://cir.nii.ac.jp/all?q=isotope%20fractionation","dc:title":"isotope fractionation"},{"@id":"https://cir.nii.ac.jp/all?q=hydrogenotrophic%20methanogen","dc:title":"hydrogenotrophic methanogen"},{"@id":"https://cir.nii.ac.jp/all?q=syntrophic%20cooperation","dc:title":"syntrophic cooperation"},{"@id":"https://cir.nii.ac.jp/all?q=hydrogen%20concentration","dc:title":"hydrogen concentration"}],"project":[{"@id":"https://cir.nii.ac.jp/crid/1040282257119430656","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"23224013"},{"@type":"JGN","@value":"JP23224013"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23224013/"}],"notation":[{"@language":"ja","@value":"アイソトポマーの計測・解析技術開発による物質循環解析"},{"@language":"en","@value":"Isotopomer material cycle analysis"}]},{"@id":"https://cir.nii.ac.jp/crid/1040282257152141696","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"23657016"},{"@type":"JGN","@value":"JP23657016"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23657016/"}],"notation":[{"@language":"ja","@value":"好塩性アーキアが G+C 含量の異なるリボソーム RNA を使い分ける可能性の追究"},{"@language":"en","@value":"Diversity and transcription of 16S rRNA genes on the genome of halophilic archaea"}]},{"@id":"https://cir.nii.ac.jp/crid/1040282257465202432","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"10J07563"},{"@type":"JGN","@value":"JP10J07563"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10J07563/"}],"notation":[{"@language":"ja","@value":"硫化カルボニルの四種硫黄同位体比に注目した、成層圏硫酸エアロゾル生成過程の解明"}]}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360002215857603456","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Geochemical origin of hydrothermal fluid methane in sediment-associated fields and its relevance to the geographical distribution of whole hydrothermal circulation"}]},{"@id":"https://cir.nii.ac.jp/crid/1360004232166617728","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Hydrogen isotope systematics among H2–H2O–CH4 during the growth of the hydrogenotrophic methanogen Methanothermobacter thermautotrophicus strain ΔH"}]},{"@id":"https://cir.nii.ac.jp/crid/1360011142940214656","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Carbon isotope fractionation during bacterial methanogenesis by CO2 reduction"}]},{"@id":"https://cir.nii.ac.jp/crid/1360292617913633408","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Carbon and hydrogen isotope systematics of bacterial formation and oxidation of methane"}]},{"@id":"https://cir.nii.ac.jp/crid/1360292619523334784","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Carbon and hydrogen isotope fractionation by moderately thermophilic methanogens 1 1Associate editor: N. 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