{"_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": ["1642838338003", "1642838406414"]}, "author_link": [], "item_1617186331708": {"attribute_name": "Title", "attribute_value_mlt": [{"subitem_1551255647225": "Isotopic variation of molecular hydrogen in 20\u00b0\u2013375\u00b0C 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": "\u00a92010. 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\u00b0\u2013375\u00b0C 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\u2030 in the \u03b4DH2 value. The \u03b4DH2 values in the high-temperature fluids were between \u2212405\u2030 and \u2212330\u2030, 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 \u03b4DH2 values than those in the high-temperature fluids in spite of a negligible \u03b4DH2 change due to fluid-seawater mixing, suggesting the possibility of \u03b4DH2 change in the low-temperature fluids and the surrounding environments. Since the \u03b4DH2 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 \u03b4DH2 variation in deep-sea hydrothermal systems presents the availability of the \u03b4DH2 value as a new tracer for microbes whose enzymes catalyze D/H exchange in H2.", "subitem_description_type": "Other"}, {"subitem_description": "\u8ad6\u6587", "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": [{"bibliographicIssueNumber": "G3", "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", "download_preview_message": "", "file_order": 0, "filename": "vol115g3.pdf", "future_date_message": "", "is_thumbnail": false, "mimetype": "", "size": 0, "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\u00b0\u2013375\u00b0C hydrothermal fluids as detected by a new analytical method", "item_type_id": "15", "owner": "1", "path": ["1642838338003", "1642838406414"], "permalink_uri": "http://hdl.handle.net/20.500.12000/37628", "pubdate": {"attribute_name": "PubDate", "attribute_value": "2018-01-30"}, "publish_date": "2018-01-30", "publish_status": "0", "recid": "2008841", "relation": {}, "relation_version_is_last": true, "title": ["Isotopic variation of molecular hydrogen in 20\u00b0\u2013375\u00b0C hydrothermal fluids as detected by a new analytical method"], "weko_shared_id": -1}