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Yoko Ohtomo
Researcher at Hokkaido University
Publications - 14
Citations - 297
Yoko Ohtomo is an academic researcher from Hokkaido University. The author has contributed to research in topics: Coal & Chemistry. The author has an hindex of 6, co-authored 12 publications receiving 252 citations. Previous affiliations of Yoko Ohtomo include Tohoku University & Japan Agency for Marine-Earth Science and Technology.
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Journal ArticleDOI
Evidence for biogenic graphite in early Archaean Isua metasedimentary rocks
TL;DR: The graphite was formed from biologically formed carbon that was deposited at least 3.7 billion years ago in Isua, West Greenland as discussed by the authors, but its origins are still unknown.
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Deep-biosphere methane production stimulated by geofluids in the Nankai accretionary complex
Akira Ijiri,Fumio Inagaki,Yusuke Kubo,Rishi Ram Adhikari,Shohei Hattori,Tatsuhiko Hoshino,Hiroyuki Imachi,Shinsuke Kawagucci,Yuki Morono,Yoko Ohtomo,Shuhei Ono,Sanae Sakai,Ken Takai,Ken Takai,Tomohiro Toki,David T. Wang,Marcos Yukio Yoshinaga,Gail Lee Arnold,Juichiro Ashi,David H. Case,Tomas Feseker,Kai-Uwe Hinrichs,Yojiro Ikegawa,Minoru Ikehara,Jens Kallmeyer,Hidenori Kumagai,Mark A. Lever,Sumito Morita,Ko-ichi Nakamura,Yuki Nakamura,Manabu Nishizawa,Victoria J. Orphan,Hans Røy,Frauke Schmidt,Atsushi Tani,Wataru Tanikawa,Takeshi Terada,Hitoshi Tomaru,Takeshi Tsuji,Takeshi Tsuji,Urumu Tsunogai,Yasuhiko T. Yamaguchi,Naohiro Yoshida +42 more
TL;DR: These findings indicate that subduction-associated fluid migration has stimulated microbial activity in the mud reservoir and that mud volcanoes may contribute more substantially to the methane budget than previously estimated.
Biological CO2 conversion to acetate in subsurface coal-sand formation using a high-pressure reactor system
Yoko Ohtomo,Akira Ijiri,Yojiro Ikegawa,M. Tsutsumi,Hiroyuki Imachi,Go-Ichiro Uramoto,Tatsuhiko Hoshino,Yuki Morono,Wataru Tanikawa,Takehiro Hirose,Fumio Inagaki +10 more
TL;DR: In this article, a flow-through-type reactor system was developed to examine potential geophysical, geochemical and microbiological impacts associated with CO2 injection by simulating in-situ pressure (0-100 MPa) and temperature (0 -70°C) conditions.
Journal ArticleDOI
Biological CO2 conversion to acetate in subsurface coal-sand formation using a high-pressure reactor system
Yoko Ohtomo,Akira Ijiri,Yojiro Ikegawa,Yojiro Ikegawa,Masazumi Tsutsumi,Hiroyuki Imachi,Go-Ichiro Uramoto,Tatsuhiko Hoshino,Yuki Morono,Sanae Sakai,Yumi Saito,Wataru Tanikawa,Takehiro Hirose,Fumio Inagaki +13 more
TL;DR: The results suggest that the injection of CO2 into a natural coal-sand formation preferentially stimulates homo-acetogenesis rather than methanogenesis, and that this process is accompanied by biogenic CO2 conversion to acetate.
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Magmatic-Hydrothermal Processes Associated with Rare Earth Element Enrichment in the Kangankunde Carbonatite Complex, Malawi
TL;DR: In this article, a geochemical, petrographic, and multi-isotope study on the Kangankunde carbonatite, the largest light rare earth elements (REE) resource in the Chilwa Alkaline Province in Malawi, has been conducted.