{"created":"2022-01-28T07:18:35.834328+00:00","id":2008841,"links":{},"metadata":{"_buckets":{"deposit":"41e9fb48-e12d-4d41-b961-2ab20992ecc6"},"_deposit":{"id":"2008841","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"2008841"},"status":"published"},"_oai":{"id":"oai:u-ryukyu.repo.nii.ac.jp:02008841","sets":["1642838163960:1642838338003","1642838403551:1642838406414"]},"author_link":[],"item_1617186331708":{"attribute_name":"Title","attribute_value_mlt":[{"subitem_1551255647225":"Isotopic variation of molecular hydrogen in 20°–375°C hydrothermal fluids as detected by a new analytical method","subitem_1551255648112":"ja"}]},"item_1617186419668":{"attribute_name":"Creator","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Kawagucci, Shinsuke","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"Toki, Tomohiro","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"Ishibashi, Junichiro","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"Takai, Ken","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"Ito, Michihiro","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"Oomori, Tamotsu","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"Gamo, Toshitaka","creatorNameLang":"en"}]}]},"item_1617186476635":{"attribute_name":"Access Rights","attribute_value_mlt":[{"subitem_1522299639480":"open access","subitem_1600958577026":"http://purl.org/coar/access_right/c_abf2"}]},"item_1617186499011":{"attribute_name":"Rights","attribute_value_mlt":[{"subitem_1522650717957":"ja","subitem_1522651041219":"©2010. American Geophysical Union."}]},"item_1617186626617":{"attribute_name":"Description","attribute_value_mlt":[{"subitem_description":"[1] Molecular hydrogen (H2) is one of the most important energy sources for subseafloor chemolithoautotrophic microbial ecosystems in the deep-sea hydrothermal environments. This study investigated stable isotope ratios of H2 in 20°–375°C hydrothermal fluids to evaluate usefulness of the isotope ratio as a tracer to explore the H2-metabolisms. Prior to the observation, we developed an improved analytical method for the determination of concentration and stable isotope ratio of H2. This method achieved a relatively high sensitivity with a detection limit of 1 nmol H2 within an analytical error of 10‰ in the δDH2 value. The δDH2 values in the high-temperature fluids were between −405‰ and −330‰, indicating the achievement of the hydrogen isotopic equilibrium between H2 and H2O at around the hydrothermal end-member temperature. In contrast, several low-temperature fluids showed apparently smaller δDH2 values than those in the high-temperature fluids in spite of a negligible δDH2 change due to fluid-seawater mixing, suggesting the possibility of δDH2 change in the low-temperature fluids and the surrounding environments. Since the δDH2 change in low-temperature environments is not well explained by the very sluggish abiotic thermal isotopic equilibrium between H2 and H2O, it could be associated with (micro)biological H2-consuming and/or H2-generating metabolisms that would strongly promote the isotopic equilibrium at low temperatures. Our first detection of the δDH2 variation in deep-sea hydrothermal systems presents the availability of the δDH2 value as a new tracer for microbes whose enzymes catalyze D/H exchange in H2.","subitem_description_type":"Other"},{"subitem_description":"論文","subitem_description_type":"Other"}]},"item_1617186643794":{"attribute_name":"Publisher","attribute_value_mlt":[{"subitem_1522300295150":"en","subitem_1522300316516":"American Geophysical Union"}]},"item_1617186702042":{"attribute_name":"Language","attribute_value_mlt":[{"subitem_1551255818386":"eng"}]},"item_1617186783814":{"attribute_name":"Identifier","attribute_value_mlt":[{"subitem_identifier_type":"HDL","subitem_identifier_uri":"http://hdl.handle.net/20.500.12000/37628"}]},"item_1617186920753":{"attribute_name":"Source Identifier","attribute_value_mlt":[{"subitem_1522646500366":"ISSN","subitem_1522646572813":"2156-2202"}]},"item_1617186941041":{"attribute_name":"Source Title","attribute_value_mlt":[{"subitem_1522650068558":"en","subitem_1522650091861":"Journal of Geophysical Research: Biogeosciences"}]},"item_1617187056579":{"attribute_name":"Bibliographic Information","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2010-08-28","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"G3","bibliographicPageStart":"none","bibliographicVolumeNumber":"115"}]},"item_1617187136212":{"attribute_name":"Date Granted","attribute_value_mlt":[{"subitem_1551256096004":"2010-08-28"}]},"item_1617258105262":{"attribute_name":"Resource Type","attribute_value_mlt":[{"resourcetype":"journal article","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_1617265215918":{"attribute_name":"Version Type","attribute_value_mlt":[{"subitem_1522305645492":"VoR","subitem_1600292170262":"http://purl.org/coar/version/c_970fb48d4fbd8a85"}]},"item_1617353299429":{"attribute_name":"Relation","attribute_value_mlt":[{"subitem_1522306287251":{"subitem_1522306382014":"DOI","subitem_1522306436033":"https://doi.org/10.1029/2009JG001203"}},{"subitem_1522306287251":{"subitem_1522306382014":"DOI","subitem_1522306436033":"info:doi/10.1029/2009JG001203"}}]},"item_1617605131499":{"attribute_name":"File","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_access","filename":"vol115g3.pdf","mimetype":"application/pdf","url":{"objectType":"fulltext","url":"https://u-ryukyu.repo.nii.ac.jp/record/2008841/files/vol115g3.pdf"},"version_id":"86f7645c-4674-400c-b3c6-8e9f44a33484"}]},"item_title":"Isotopic variation of molecular hydrogen in 20°–375°C hydrothermal fluids as detected by a new analytical method","item_type_id":"15","owner":"1","path":["1642838338003","1642838406414"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2018-01-30"},"publish_date":"2018-01-30","publish_status":"0","recid":"2008841","relation_version_is_last":true,"title":["Isotopic variation of molecular hydrogen in 20°–375°C hydrothermal fluids as detected by a new analytical method"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-08-03T05:41:42.026949+00:00"}