Updated on 2026/04/15

写真a

 
TOYODA SAKAE
 
Organization
School of Materials and Chemical Technology Associate Professor
Title
Associate Professor
Homepage
http://silab.cap.mac.titech.ac.jp/
External link

News & Topics

Degree

  • Doctor of Science ( The University of Tokyo )

Research Interests

  • 微量気体

  • 安定同位体

  • 大気化学

  • 地球環境

  • Stable isotope

  • isotopomer

  • Atmospheric chemistry

  • Global environment

  • アイソトポマー

  • Trace gasses

Research Areas

  • Natural Science / Atmospheric and hydrospheric sciences

  • Natural Science / Biogeosciences

  • Environmental Science/Agriculture Science / Environmental dynamic analysis

Education

  • 東京大学大学院   理学系研究科   化学

    - 1997

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    Country： Japan

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  • The University of Tokyo   Faculty of Science

    - 1992

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    Country： Japan

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Research History

  • -:東京工業大学 助手

    1999

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  • -:Tokyo Institute of Technology Research Associate

    1999

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Professional Memberships

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Papers

  • Stratospheric <mml:msup>δ13</mml:msup>CO2 observed over Japan and its governing processes

    Satoshi Sugawara, Shinji Morimoto, Shigeyuki Ishidoya, Taku Umezawa, Shuji Aoki, Takakiyo Nakazawa, Sakae Toyoda, Kentaro Ishijima, Daisuke Goto, Hideyuki Honda

    ATMOSPHERIC CHEMISTRY AND PHYSICS   25 ( 19 )   11895 - 11917   2025.10

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.5194/acp-25-11895-2025

    Web of Science

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  • Triple sulfur isotope analysis of picomole carbonyl sulfide using gas chromatography-isotope ratio mass spectrometry

    Kazuki Kamezaki, Shigeyuki Ishidoya, Shohei Murayama, Takahisa Maeda, Sakae Toyoda, Sebastian O. Danielache, Naohiro Yoshida

    Analytica Chimica Acta   1369   344368 - 344368   2025.10

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    Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.aca.2025.344368

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  • Unprecedented N 2 O production by nitrate-ammonifying Geobacteraceae with distinctive N 2 O isotopocule signatures

    Zhenxing Xu, Shohei Hattori, Yoko Masuda, Sakae Toyoda, Keisuke Koba, Pei Yu, Naohiro Yoshida, Zong-Jun Du, Keishi Senoo

    mBio   2024.10

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    Publishing type：Research paper (scientific journal)   Publisher：American Society for Microbiology  

    ABSTRACT

    Dissimilatory nitrate reduction to ammonium (DNRA), driven by nitrate-ammonifying bacteria, is an increasingly appreciated nitrogen-cycling pathway in terrestrial ecosystems. This process reportedly generates nitrous oxide (N 2 O), a strong greenhouse gas with ozone-depleting effects. However, it remains poorly understood how N 2 O is produced by environmental nitrate-ammonifiers and how to identify DNRA-derived N 2 O. In this study, we characterize two novel enzymatic pathways responsible for N 2 O production in Geobacteraceae strains, which are predominant nitrate-ammonifying bacteria in paddy soils. The first pathway involves a membrane-bound nitrate reductase (Nar) and a hybrid cluster protein complex (Hcp–Hcr) that catalyzes the conversion of NO 2 − to NO and subsequently to N 2 O. The second pathway is observed in Nar-deficient bacteria, where the nitrite reductase (NrfA) generates NO, which is then reduced to N 2 O by Hcp–Hcr. These enzyme combinations are prevalent across the domain Bacteria. Moreover, we observe distinctive isotopocule signatures of DNRA-derived N 2 O from other established N 2 O production pathways, especially through the highest 15 N-site preference (SP) values (43.0‰–49.9‰) reported so far, indicating a robust means for N 2 O source partitioning. Our findings demonstrate two novel N 2 O production pathways in DNRA that can be isotopically distinguished from other pathways.

    IMPORTANCE

    Stimulation of DNRA is a promising strategy to improve fertilizer efficiency and reduce N 2 O emission in agriculture soils. This process converts water-leachable NO 3 − and NO 2 − into soil-adsorbable NH 4 + , thereby alleviating nitrogen loss and N 2 O emission resulting from denitrification. However, several studies have noted that DNRA can also be a source of N 2 O, contributing to global warming. This contribution is often masked by other N 2 O generation processes, leading to a limited understanding of DNRA as an N 2 O source. Our study reveals two widespread yet overlooked N 2 O production pathways in Geobacteraceae , the predominant DNRA bacteria in paddy soils, along with their distinctive isotopocule signatures. These findings offer novel insights into the role of the DNRA bacteria in N 2 O production and underscore the significance of N 2 O isotopocule signatures in microbial N 2 O source tracking.

    DOI： 10.1128/mbio.02540-24

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  • Sulfate as an Alternative Electron Acceptor: A Potential Strategy to Mitigate N2O Emissions in Upland Arable Soils

    HYUN HO LEE, CHANG OH HONG, HANBEEN KIM, YELIM PARK, JEONGEUN YUN, Jaehyun Lee, Hojeong Kang, JEONGEUN KIM, Jinho Ahn, Sakae Toyoda, SANG YOON KIM, Marcus Horn

    2024.7

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  • Dynamics of N2O production and reduction processes in a soybean field revealed by isotopocule analyses

    Sakae Toyoda, Fadwa Damak, Shohei Hattori, Masanori Takeda, Hiroko Akiyama, Yuma Sasaki, Kiwamu Minamisawa

    Soil Biology and Biochemistry   109358 - 109358   2024.2

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    Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.soilbio.2024.109358

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Books

  • 成層圏・対流圏を巡る大気

    長谷部, 文雄, 青木, 周司, 柴田, 隆（ Role： Joint author第７章 発展を支える新技術）

    日本気象学会  2025.7  （ ISBN:9784904129333 ）

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    Total pages：iv, 153p   Language：Japanese  

    CiNii Books

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Presentations

  • Numerical Simulations of Age of Air and Gravitational Separation in Antarctic Stratosphere

    Numerical Simulations of, Age of Air, Gravitational, Separation in Antarctic Stratosphere

    2025.11 

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    Event date： 2025.11

    Language：English   Presentation type：Poster presentation  

    Country：Japan  

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  • 南極昭和基地上空成層圏のSF6濃度から推定した大気年齢

    小野寺優海, 菅原敏, 石戸谷重之, 森本真司, 石島健太郎, 後藤大輔, 橋田元, 町田敏暢, 豊田栄, 青木周司, 中澤高清, 本田秀之

    日本気象学会2025年度秋季大会 

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    Event date： 2025.11

    Language：Japanese   Presentation type：Poster presentation  

    Venue：福岡   Country：Japan  

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  • 改良型クライオサンプラー性能実証試験（B25-01）の結果速報

    菅原敏, 森本真司, 本田秀之, 豊田栄, 石戸谷重之, 後藤大輔, 亀崎和輝, 澤拓, 荻原勇輝, 佐々木郁弥, 飯嶋一征, 池田忠作, 福家英之

    大気球シンポジウム  2025.10 

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    Event date： 2025.10

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：相模原   Country：Japan  

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  • 南北両半球の大気中N2Oアイソトポキュル比の経年変化

    豊田栄, 笹川基樹, 町田敏暢, 遠嶋康徳, 森本真司, 後藤大輔, Doug Worthy, 吉田尚弘

    2025.10 

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    Event date： 2025.10

    Language：Japanese   Presentation type：Poster presentation  

    Venue：柏   Country：Japan  

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  • 使用過程ディーゼル重量車の実路走行時の NOx 排出挙 動解析と排出量推計への応用

    佐藤友規, 國領和夫, 尾形竹彦, 山﨑実, 濱良仁, 豊田栄, 星純也

    第66回大気環境学会年会  2025.9 

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    Event date： 2025.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：名古屋   Country：Japan  

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  • 清浄大気中水素の安定同位体比分析法開発

    佐々木郁弥, 神谷駿介, 渡邉聡太朗, 山田桂太, 豊田栄

    日本地球化学会 第72回年会  2025.9 

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    Event date： 2025.9

    Language：Japanese   Presentation type：Poster presentation  

    Venue：仙台  

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  • 森林伐採が土壌のN2O放出に与える影響の解明

    高矢怜菜, 豊田栄, 小田智基, 岩上翔, 藤井一至

    日本地球化学会 第72回年会  2025.9 

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    Event date： 2025.9

    Language：Japanese   Presentation type：Poster presentation  

    Venue：仙台  

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  • Guidance for uncertainty estimation for isotopic reference materials characterised by interlaboratory study International coauthorship International conference

    Philip Dunn, Simon Cowen, Heike Geilmann, Heiko Moosen, Sarah Wexler, Jan Kaiser, Stan Mroczkowski, JK Bohlke, Tyler Coplen, Nathaniel Ostrom, Sakae Toyoda, Naohiro Yoshida, Joachim Moh

    Joint European Stable Isotope Users Meeting (JESIUM)  2025.6 

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    Event date： 2025.6

    Language：English   Presentation type：Poster presentation  

    Venue：Groningen   Country：Netherlands  

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  • ダイズ根圏で亜硝酸からN2Oを生成するFusarium属菌

    森内真人, 葛貫桂一, 池西史生, 鮫島玲子, 中桐昭, 豊田栄, 勝山千恵, 柿崎芳里, 板倉学, 吉田尚弘, 諏訪裕一, 南澤究

    日本土壌微生物学会2025年度大会  2025.6 

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    Event date： 2025.6

    Language：Japanese   Presentation type：Poster presentation  

    Venue：土浦  

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  • 土壌細菌による大気中水素酸化における水素同位体効果の測定

    神谷 駿介, 佐々木 郁, 豊田 栄, 山田 桂太, 玉木 秀幸, 菅野 学

    日本地球惑星科学連合2025年大会  2025.5 

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    Event date： 2025.5

    Language：Japanese   Presentation type：Poster presentation  

    Venue：千葉  

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  • Emission factors and isotopic characteristics of N₂O from diesel heavy-duty vehicles International conference

    Yuki Sato, Megumi Okada, Sakae Toyoda

    11th International Symposium on Isotopomers  2024.11 

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    Language：English   Presentation type：Poster presentation  

    Venue：Tokyo   Country：Japan  

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  • Vertical distribution of stratospheric N2O isotopocules and its temporal variation over Japan and Antarctica International conference

    Sakae Toyoda, Shinji Morimoto, Hideyuki Honda, Shuji Aoki, Takakiyo Nakazawa, Satoshi Sugawara, Shigeyuki Ishidoya, Daisuke Goto, Naohiro Yoshida

    11th International Symposium on Isotopomers  2024.11 

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    Language：English   Presentation type：Poster presentation  

    Venue：Tokyo   Country：Japan  

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  • 40 years of N₂O isotopomer research: Advances in analytics and exemplary applications International coauthorship International conference

    Sakae Toyoda, Joachim Mohn

    11th International Symposium on Isotopomers  2024.11 

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    Language：English   Presentation type：Oral presentation (general)  

    Venue：Tokyo   Country：Japan  

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  • Unprecedented N2O production by soil nitrate-ammonifiers Geobacteraceae with distinctive N2O isotopocule signatures International coauthorship International conference

    Zhenxing Xu, Shohei Hattori, Yoko Masuda, Sakae Toyoda, Keisuke Koba, Pei Yu, Naohiro Yoshida, Zong-Jun Du, Keishi Senoo

    the 18th Congress of the International Union of Microbiological Societies (IUMS)  2024.10 

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    Language：English   Presentation type：Oral presentation (general)  

    Venue：Florence   Country：Italy  

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  • Japanese observation programs of atmospheric greenhouse gases at Syowa Station, Antarctica and Ny-Ålesund, Svalbard International conference

    Daisuke Goto, Shinji Morimoto, Shigeyuki Ishidoya, Shohei Murayama, Sakae Toyoda, Satoshi Sugawara

    15th Symposium on Polar Science  2024.12 

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    Language：English   Presentation type：Poster presentation  

    Venue：Tachikawa   Country：Japan  

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  • 成層圏大気の直接採取による温室効果気体及び関連気体の高精度観測

    森本真司,菅原敏,石戸谷重之,豊田栄,後藤大輔,亀崎和輝,本田秀之

    地球電磁気・地球惑星圏学会2024年秋季年会  2024.11 

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    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：立川   Country：Japan  

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  • Sulfur isotopes ratio of atmospheric carbonyl sulfide: reduction of required sample amount International conference

    K. Kamezaki, S. Ishidoya, S. Murayama, S. Toyoda, N. Yoshida

    11th International Symposium on Isotopomers  2024.11 

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    Language：English   Presentation type：Poster presentation  

    Venue：Tokyo   Country：Japan  

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  • Greenhouse gas molar ratios and stable isotopic compositions in Seoul Mega City International coauthorship International conference

    JeongEun Kim, Jinho Ahn, Sakae Toyoda

    The 37th International Geological Conference  2024.8 

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    Language：English   Presentation type：Oral presentation (general)  

    Venue：Busan   Country：Korea, Republic of  

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  • 成層圏CO2のδ13Cの数値シミュレーション

    菅原敏, 石戸谷重之, 森本真司, 梅澤拓, 後藤大輔,長谷部文雄, 豊田栄,青木周司, 中澤高清, 本田秀之

    第28回大気化学討論会  2024.7 

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    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：長崎   Country：Japan  

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  • 硝化細菌によるN2O生成の海洋酸性化に対する応答

    豊田 栄,佐藤 健,平根 達朗,松井 智哉,藤原 健智,吉田 尚弘

    日本地球惑星科学連合大会2024  2024.5 

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    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：千葉   Country：Japan  

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  • Nitrous oxide emissions and stable isotopic composition in urban sources and ambient air in Seoul, South Korea International coauthorship International conference

    JeongEun Kim, Jinho Ahn, Sakae Toyoda

    EGU General Assembly 2024  2024.4 

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    Language：English   Presentation type：Oral presentation (general)  

    Venue：Vienna   Country：Austria  

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  • 北半球中高緯度における大気中N2Oアイソトポキュル比の時空間分布

    豊田栄, 笹川基樹, 町田敏暢, 遠嶋康徳,吉田尚弘

    日本地球化学会 第71回年会  2024.9 

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    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：金沢   Country：Japan  

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  • 路上走行試験による使用過程大型車からの排出ガスの排出特性③（台上試験データを用いた路上走行時NOx排出量の評価手法）

    佐藤友規,陸田雅彦,山﨑実,國領和夫,尾形竹彦,豊田栄,星純也

    第65回大気環境学会年会  2024.9 

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    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：横浜   Country：Japan  

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  • 改良型クライオサンプラー性能実証試験（2025年度国内申請実験）

    森本真司,菅原敏,石戸谷重之,豊田栄,後藤大輔,亀崎和輝,本田秀之,梅澤拓,石島健太郎,池田忠作,飯嶋一征,福家英之

    2024年度大気球シンポジウム  2024.10 

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    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：相模原   Country：Japan  

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Research Projects

  • 多成分気体分析に基づく成層圏物質循環の長期変動の評価

    Grant number：23H00513  2023.4 - 2028.3

    日本学術振興会  科学研究費助成事業  基盤研究(A)

    菅原 敏, 梅澤 拓, 後藤 大輔, 森本 真司, 豊田 栄, 石戸谷 重之, 丹羽 洋介, 石島 健太郎

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    Grant amount：\46800000 （ Direct Cost: \36000000 、 Indirect Cost：\10800000 ）

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  • 長期的に継続可能な安定炭素同位体比の絶対値を決定した標準ガス調製法の開発

    Grant number：22K05165  2022.4 - 2025.3

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    下坂 琢哉, 豊田 栄, 山田 桂太

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    Grant amount：\4160000 （ Direct Cost: \3200000 、 Indirect Cost：\960000 ）

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  • Investigation of N_2_O behavior in nature by isotopomer analysis

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    Grant type：Competitive

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  • アイソトポマー計測による環境中のN_2_Oの挙動の解明

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    Grant type：Competitive

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