論文

• Takuro Nunoura, Yoshihiro Takaki, Miho Hirai, Shigeru Shimamura, Akiko Makabe, Osamu Koide, Tohru Kikuchi, Junichi Miyazaki, Keisuke Koba, Naohiro Yoshida, Michinari Sunamura, Ken Takai. Hadal biosphere: insight into the microbial ecosystem in the deepest ocean on Earth, Vol. 112, No. 11, pp. E1230–E1236, 2015.
• Midori Yano, Sakae Toyoda, T. Tokida, K. Hayashi, T. Hasegara, A. Makabe, Keisuke Koba. Isotopomer analysis of production, consumption and soil-to-atmosphere emission processes of N2O at the beginning of paddy field irrigation, Soil Biology & Biochemistry, 2013.
• M. Nishizawa, Kisuke Koba, M. Kaneko, S. Hirao, J. Ishibashi, T. Yamanaka, T. Shibuya, T. Kikuchi, M. Hirai, J. Miyazaki, T. Nunoura, K. Takai, M. Nishizawa, Keisuke Koba, Akiko Makabe, Naohiro Yoshida, M. Kaneko, S. Hirao, J. Ishibashi, T. Yamanaka, T. Shibuya, T. Kikuchi, M. Hirai, J. Miyazaki, T. Nunoura, K. Takai. Nitrification-driven forms of nitrogen metabolism in microbial mat communities thriving along an ammonium-enriched subsurface geothermal stream., Geochimica et Cosmochimica Acta, Vol. 113, pp. 152-173, 2013.
• Keisuke Koba, Yunting Fang, Jiangming Mo, Wei Zhang, Xiankai Lu, Lei Liu, Tao Zhang, Yu Takebayashi, Sakae Toyoda, Naohiro Yoshida, Keisuke Suzuki, Muneoki Yoh, Keishi Senoo. The 15N natural abundance of the N lost from an N-saturated subtropical forest in southern China, Journal of Geophsical Research, Vol. 117, May 2012.
• Nobuhito Ohte, Ichiro Tayasu, Ayato Kohzu, Chikage Yoshimizu, Ken'ichi Osaka, Akiko Makabe, Keisuke Koba, Naohiro Yoshida, Toshi Nagata. Correction to “Spatial distribution of nitrate sources of rivers in the Lake Biwa watershed, Japan: Controlling factors revealed by nitrogen and oxygen isotope values”, Water Resouces Research, Vol. 48, 2012.
• Nakagawa Mayuko, Yuichiro Ueno, Shohei Hattori, Maki Umemura, Akihiko Yagi, Ken Takai, Keisuke Koba, Yuji Sasaki, Akiko Makabe, Naohiro Yoshida. Seasonal change in microbial sulfur cycling in monomictic Lake Fukami-ike, Japan, Limnology & Oceanography, Vol. 57, pp. 974-988, 2012.
• Sakae Toyoda, Midori Yano, S. Nishimura, H. Akiyama, A. Hayakawa, Keisuke Koba, S. Sudo, K. Yagi, Akiko Makabe, Yoshifumi Tobari, N. O. Ogawa, Nao Ohkouch, Keita Yamada, Naohiro Yoshida. Characterization and production and consumption processes of N2O emitted from temperate agricultural aoils determined via isotopomer ratio analysis, Global Biogeochem. Cycles, Vol. 17, May 2011.
• Sasaki, Y., Keisuke Koba, M. Yamamoto, Akiko Makabe, Yuichiro Ueno, Mayuko Nakagawa, Sakae Toyoda, Naohiro Yoshida, M. Yoh. Biogeochemistry of nitrous oxide in Lake Kizaki, Japan, elucidated by nitrous oxide isotopomer analysis, J. Geophys. Res., Vol. 116, pp. 1-10, 2011.
• Nobuhito Ohte, Ichiro Tayasu, Ayato Kohzu, Chikage Yoshimizu, Kenichi Osaka, Akiko Makabe, Keisuke Koba, Naohiro Yoshida, Toshi Nagata. Spatial distribution of nitrate sources of rivers in the Lake Biwa watershed, Japan: Controlling factors revealed by nitrogen and oxygen isotope values, Water Resources Research, Vol. 46, W07505, 16 PP, Mar. 2010.
• Hiroyuki Kimura, Kousuke Mori, Hiroaki Nashimoto, Shohei Hattori, Keita Yamada, Keisuke Koba, Naohiro Yoshida, Kenji Kato. Biomass production and energy source of thermophiles in a Japanese alkaline geothermal pool, Environmental Microbiology, Vol. 12, No. 2, pp. 480-489, 2010.
• Yoshifumi Tobari, Keisuke Koba, Keitaro Fukushima, Naoko Tokuchi, Nobuhito Ohte, Ryunosuke Tateno, Sakae Toyoda, Takahito Yoshioka, Naohiro Yoshida. Contribution of atmospheric nitrate to stream-water nitrate in Japanese coniferous forests revealed by oxygen isotope ratio of nitrate, Rapid Communications in Mass Spectrometry, Vol. 24, pp. 1-6, 2010.
• Keisuke Koba, K. Osaka, Yoshifumi Tobari, Sakae Toyoda, N. Ohte, Katsuyama, Suzuki, M. Itoh, H. Yamagishi, M. Kawasaki, S. Kim, Naohiro Yoshida, T. Nakajima. Biogeochemistry of nitrous oxide in roundwater in a forested ecosystem elucidated by nitrous oxide isotopomer measurements, Geochimica et Cosmochimica Acta,, 3115-3133, June 2009.
• Sakae Toyoda, Hiroyuki Iwai, Keisuke Koba, Naohiro Yoshida. Isotopomeric analysis of N2O dissolved in a river in the Tokyo metropolitan area, Rapid Communications in Mass Spectrometry, Vol. 23, pp. 809-821, Mar. 2009.
• Hiroaki Yamagishi, Marian. B. Westley, Brian N. Popp, Sakae Toyoda, Naohiro Yoshida, Shuichi Watanabe, Keisuke Koba, Yasuhiro Yamanaka. Role of nitrification and denitrification on the nitrous oxide cycle in the eastern tropical North Pacific and Gulf of California., J. Geophys. Res.-Biogeosciences, Vol. 112, No. G02015, June 2007.

国際会議発表 (査読なし・不明)

• Thuan, Nguyen Cong, Keisuke Koba, Midori Yano, Akiko Makabe, Co Thi Kinh, Akihiko Terada, Sakae Toyoda, Naohiro Yoshida, Yotaro Tanaka, Masanori Katsuyama, Muneoki Yoh. Integrated approaches of N2/Ar measurement, stable isotopic and molecular techniques and investigating dissolved organic matter characteristics to evidence the denitrification in river, IsoEcol2016, Apr. 2016.
• Midori Yano, Sakae Toyoda, Takeshi Tokida, Kentaro Hayashi, Toshihiro Hasegawa, Hirohumi Nakamura, Akiko Makabe, Keisuke Koba, Naohiro Yoshida. Large contributions of nitrification and fungal denitrification in N2O productions in drained paddy fields exposed to CO2 of current and future atmospheric concentrations, ICoN3, Sept. 2013.
• Akiko Makabe, Keisuke Koba, Chikage Yoshimizu, I.chiro Tayasu, N. O. Ogawa, Naohiko Ohkouchi, Sakae Toyoda, Naohiro Yoshida, Toshi Nagata. Fate of atmospheric nitrate and nitrogen biogeochemical processes in Lake Biwa elucidated by multiple oxygen isotopes, 2012 ASLO Aquatic Sciences Meeting, July 2012.
• Nozomi Suzuki, Keisuke Koba, M Itoh, K. Osaka, Nobuhito Ohte, Yoshifumi Tobari, Keita Yamada, Naohiro Yoshida. Isotopic fractionation during methane uptake in temperate forest soil, ISI2012, June 2012.
• Mayuko Nakagawa, Yuichiro Ueno, Shohei Hattori, Ken Takai, Keisuke Koba, Yuuji Sasaki, Akiko Makabe, Maki Umemura, Akihiko Yagi, Naohiro Yoshida. Seasonal change of microbial sulfur cycle in monomictic lake Fukami-ike, Japan, 2012 ASLO Aquatic Sciences Meeting, 2012.
• Akiko Makabe, Keisuke Koba, Chikage Yoshimizu, Ichiro Tayasu, Nanako O. Ogawa, Naohiko Ohkouchi, Sakae Toyoda, Toshi Nagata, Naohiro Yoshida. Oxygen isotopic composition of nitrous oxide produced in Lake Biwa, International Symposium on Isotope Ecology 2010 in Kyoto, COOP Inn Kyoto, Nov. 2010.
• Shohei Hattori, Hiroaki Nashimoto, Hiroyuki Kimura, Keisuke Koba, Keita Yamada, Mikio Shimizu, Hiroshi Watanabe, Muneoki Yoh, Naohiro Yoshida. Hydrogen and carbon isotope fractionation by thermophilic hydrogenotrophic methanogens from a geothermal aquifer under coculture with fermenters, ISI2010, June 2010.
• Mayuko Nakagawa, Yuichiro Ueno, Shohei Hattori, Maki Umemura, Akihiko Yagi, Ken Takai, Keisuke Koba, Akiko Makabe, Yuji Sasaki, Naohiro Yoshida. Sulfur mass balances and microbial metabolisms in a sulfur rich monomictic lake: A case study of the Lake Fukami-ike, The 5th International Symposium on Isotopomers, June 2010.  公式リンク  
  
• Nozomi Suzuki, Keisuke Koba, Yohei Matsui, Keita Yamada, Naohiro Yoshida. Influence of Long-term, Whole-Ecosystem Experiments on Methane Dynamics in Arctic Soils, 4th International Symposium on Isotopomers, 4th International Symposium on Isotopomers proceedings, ISI2008 Science Committee, pp. 152-153, Oct. 2008.
• Keisuke Koba, Yurika Isogai, Muneoki Yoh, Jiangming Mo, Sakae Toyoda, Naohiro Yoshida. Nitrogen dynamics in a sub-tropical forest in south China, 4th International Symposium on Isotopomers, 4th International Symposium on Isotopomers proceedings, ISI2008 Science Committee, pp. 197-198, Oct. 2008.
• Sakae Toyoda, Midori Yano, Sei-ichi Nishimura, Keisuke Koba, Keita Yamada, Naohiro Yoshida. Isotopomeric analysis of N2O emitted from temperate agricultural soils, 4th International Symposium on Isotopomers, 4th International Symposium on Isotopomers proceedings, ISI2008 Science Committee, pp. 202-205, Oct. 2008.
• Akiko Makabe, K. Koba, I. Tayasu, M. Itoh, N. O. Ogawa, S. Toyoda, N. Yoshida. Dynamics of nitrous oxide emitted from a sewage-polluted river in Mongolia, 4th International Symposium on Isotopomers, 4th International Symposium on Isotopomers proceedings, ISI2008 Science Committee, pp. 195-196, Oct. 2008.
• Yuji Sasaki, Keisuke Koba, Muneoki Yoh, Akiko Makabe, Yuichiro Ueno, Mayuko Nakagawa, Sakae Toyoda, Naohiro Yoshida. Nitrogen cycling in Lake Kizaki clucidated by isotopic analysis, 4th International Symposium on Isotopomers, 4th International Symposium on Isotopomers proceedings, ISI2008 Science Committee, pp. 94-95, Oct. 2008.

国内会議発表 (査読なし・不明)

• 矢野 翠, 豊田 栄, 常田岳志, 林健太郎, 長谷川利拡, 木庭啓介, 吉田尚弘. アイソトポマー比を用いた水田入水時における一酸化二窒素生成、放出過程の解析, 日本地球惑星科学連合2012年度連合大会, May 2012.
• 矢野 翠, 豊田 栄, 林健太郎・常田岳志, 松島未和, 和穎朗太, 南川和則, 長谷川利拡, 木庭啓介, 吉田尚弘. 高CO2条件下の水田土壌におけるN2O生成・消滅過程の同位体比を用いた解析, 日本土壌肥料科学会2011年度つくば大会, Aug. 2011.
• 豊田 栄, 矢野 翠, 早川 敦, 秋山博子, 西山誠一, 須藤重人, 木庭啓介, 山田桂太, 吉田尚弘. アイソトポマー比を用いた農耕土壌起源N２Oのキャラクタリゼーションおよび全球放出推定, 第15回大気化学討論会, 第15回大気化学討論会講演要旨集, 大気化学研究会, p. 22, Oct. 2009.
• 豊田栄, 岩井宏之, 木庭啓介, 吉田尚弘. アイソトポマー比を用いた都市河川における N2Oの動態解析, 2008年度日本地球化学会第55回年会講演, 日本地球化学会第55回年会講演要旨集, 日本地球化学会, p. 306, Sept. 2008.

学位論文

• Nitrogen dynamics in forested ecosystems elucidated by 15N natural abundance method,  本文,  Doctor of Agriculture,  Kyoto University,  2000/--/--, 

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