博士（理学）, 京都大学

生態系

食物連鎖

アミノ酸

近過去生態系変動

Compund specific isotope ratio

生態系構造解析

窒素循環

超微量分析

環境変動

生物地球化学

安定同位体比

Aquatic environment

Paleoenvironment

Biogeochemistry

Isotope Ecology

Environmental science/Agricultural science, Environmental dynamics, 海洋窒素循環

2020 - Present
Japan Agency for Marine-Earth Science and Technology, Biogeochemistry Research Center, Group Leader

2019 - 2020
海洋研究開発機構, 生物地球化学プログラム, 主任技術研究員

2014 - 2019
海洋研究開発機構, 生物地球化学研究分野, 主任技術研究員

2013 - 2014
海洋研究開発機構, 海洋・極限環境生物圏領域, 技術研究副主幹

2009 - 2013
海洋研究開発機構, 海洋・極限環境生物圏領域, 技術研究主任

2007 - 2009
海洋研究開発機構, 地球内部変動研究センター, 技術研究主任

2002 - 2007
海洋研究開発機構, 地球内部変動研究センター, 技術研究員

1999 - Nov. 2001
Woods Hole Oceanographic Institution, Department of Marine Chemistry and Geochemistry, Postdoctoral Fellow

2000 - 2001
京都大学生態学研究センター, 日本学術振興会特別研究員 (PD)

1999 - 2000
北海道大学地球環境科学研究科, 日本学術振興会特別研究員 (PD)

1996 - 1998
京都大学生態学研究センター, 日本学術振興会特別研究員 (DC2)

1995 - 1999, Kyoto University, Graduate School of Science, Division of Biological Sciences

1993 - 1995, Tokyo University of Agriculture and Technology, Graduate School of Agricultural Science, 環境保護学専攻

1989 - 1992, Tokyo University of Agriculture and Technology, Faculty of Agriculture, 環境保護学科

2023 - Present
理事, 日本地球化学会

2016 - 2017
Science Committee Member, ASLO Aquatic Sciences Meeting

Satoshi Furota; Naoto F. Ishikawa; Nanako O. Ogawa; Toshio Furota; Naohiko Ohkouchi
Tracing terrestrial nitrogen contributions to the salt marsh food web of the Obitsu River estuary in Tokyo Bay using compound-specific δ15N analysis of amino acids
Progress in Earth and Planetary Science, 09 Mar. 2026

Kohei Sakamoto; Chisato Yoshikawa; Nanako O. Ogawa; Yutaka Osada; Naoto F. Ishikawa; Shin-ichi Ito; Yusuke Yokoyama; Naohiko Ohkouchi
Estimating the migration pathway of chub mackerel using a state-space model with nitrogen isoscapes and compound-specific nitrogen isotope analysis
Progress in Oceanography, Mar. 2026

Yuchen Sun; Naoto F. Ishikawa; Nanako O. Ogawa; Yoshinori Takano; Naohiko Ohkouchi
Carbon isotopic changes of 16 proteinogenic amino acids during trophic transfer in a cultured marine consumer
Progress in Earth and Planetary Science, 28 Jan. 2026
[Reviewed]

C. Yoshikawa; H. Yamaguchi; N.O. Ogawa; A. Makabe; M. Sato; Y. Mino; K. Matsumoto; Y. Nakano; S. Kawagucci; T. Fujiki; N. Harada; M. Kawachi; N. Ohkouchi
Nitrogenous sources for summertime phytoplankton at two contrasting stations in the subarctic and subtropical western North Pacific
Progress in Oceanography, Jan. 2026
240, 103614, 103614

Takumi Tsutaya; Natsumi Aruga; Naoto F. Ishikawa; Yoko Sasaki; Haruka Kitayama; Minoru Yoneda; Nana O. Ogawa; Naohiko Ohkouchi; Chie Hashimoto
Carbon and Nitrogen Stable Isotopic Profiling of Chimpanzees and Monkeys in Kalinzu Forest Reserve, Uganda
American Journal of Primatology, Jan. 2026
[Reviewed]

Nanako O. Ogawa; Yoshinori Takano; Yu Itahashi; Naoto F. Ishikawa; Naohiko Ohkouchi
Working standards and analytical framework for CSIA: isotopic composition (δ13C, δ15N, and δ34S) of 21 amino acids and 7 nucleobases
Progress in Earth and Planetary Science, 06 Dec. 2025
[Reviewed]

Masanori Kaneko; Yoshinori Takano; Yuta Isaji; Nanako O. Ogawa; Yoshito Chikaraishi; Naoto F. Ishikawa; Hiroyuki Imachi; Yoshihiro Takaki; Miyuki Ogawara; Fumie Kabashima; Martin Krüger; Naohiko Ohkouchi
Nitrogen and carbon flows in a microbial mat involving anaerobic oxidation of methane in northwestern Black Sea: perspectives from nitrogen and carbon isotopic composition of coenzyme F430 and its biosynthetic pathway
Progress in Earth and Planetary Science, 06 Dec. 2025
[Reviewed]

Yu Itahashi; Yoshinori Takano; Yoshito Chikaraishi; Nanako O. Ogawa; Naoto F. Ishikawa; Naohiko Ohkouchi; Masako Yamane; Yusuke Yokoyama; Minoru Yoneda
Purification of hydroxyproline for small-scale radiocarbon dating verified using archaeological bone collagen
Progress in Earth and Planetary Science, 01 Dec. 2025
[Reviewed]

Nanako O. Ogawa; Toshihiro Yoshimura; Takeru Kochi; Junichiro Kuroda; Yoshinori Takano; Naohiko Ohkouchi
Nanomolar-scale sulfate sulfur isotope analysis using a combined ion chromatography–barite precipitation and nano-EA/IRMS
Progress in Earth and Planetary Science, 29 Oct. 2025
[Reviewed]

Masashi Tsuchiya; Takao Yoshida; Yoshito Chikaraishi; Nanako O. Ogawa; Hidetaka Nomaki; Yoshihiro Fujiwara; Yasuhiko T. Yamaguchi; Yohei Tada; Robert G. Jenkins; Yoko Sasaki; Katsunori Fujikura; Naohiko Ohkouchi
Nitrogen isotopic composition of amino acids reveals a variety of trophic ecology of organisms inhabiting chemosynthesis-based ecosystems
Progress in Earth and Planetary Science, 15 Oct. 2025
12, 1

Thomas M. Blattmann; Yuchen Sun; Nanako O. Ogawa; Yoshinori Takano; Negar Haghipour; Naoto F. Ishikawa; Timothy I. Eglinton; Naohiko Ohkouchi
Chromatographic isolation for performing enantiomer-specific radiocarbon analysis (ESRA): first method development for individual L- and D-amino acids
Progress in Earth and Planetary Science, 29 Sep. 2025
[Reviewed]

Takahito Ikenoue; Nanako O. Ogawa; Hidetaka Nomaki; Katsunori Kimoto; Makio C. Honda; Naohiko Ohkouchi; Tetsuichi Fujiki
New evaluation of vertical particulate organic carbon fluxes of submillimeter-sized phaeodarians in the mesopelagic twilight zone of the western North Pacific Ocean
Progress in Earth and Planetary Science, 10 Sep. 2025
[Reviewed]

Toshiki Koga; Yasuhiro Oba; Yoshinori Takano; Hiroshi Naraoka; Nanako Ogawa; Kazunori Sasaki; Hajime Sato; Toshihiro Yoshimura; Naohiko Ohkouchi
A complete set of canonical nucleobases in asteroid Ryugu demonstrates their prevalence in carbonaceous asteroids
Nature Astronomy, 11 Aug. 2025
[Reviewed]

Eitaro Wada; Yoshihisa Kudo; Hiroshi Mizutani; Hiroshi Minami; Kenji Matsubara; Yoshihiro Yamada; Nanako O. Ogawa; Yukihiro Kohmatsu; Naoko Nishizawa; Isamu Shimizu; Reiichiro Ishii; Fujio Hyodo; Maki N. Aita; Wataru Sakamoto; Naohiko Ohkouchi
Gleaning of δ15N in ecosystems and its animal-organ isotope data: perspectives for the construction of the isotopically ordered world
Progress in Earth and Planetary Science, 01 Aug. 2025
12, 1

Chisato Yoshikawa; Nanako O. Ogawa; Naoto F. Ishikawa; Michio Yoneda; Ryuji Yukami; Shin-ichi Ito; Naohiko Ohkouchi
Nitrogen and carbon isotopic relationships in the diet and eye lenses of chub mackerel revealed in a laboratory rearing experiment
Progress in Earth and Planetary Science, 23 Jul. 2025
12, 1

Arisa Shiga; Jun Matsubayashi; Nanako O. Ogawa; Naohiko Ohkouchi; Noriko Iwai
Assessing the applicability of sequential eye lens stable isotope analysis for reconstructing dietary histories in amphibians
Limnology and Oceanography: Methods, 26 Apr. 2025

Toshihiro Yoshimura; Naoto F. Ishikawa; Nanako O. Ogawa; Soichiro Kusaka; Shigeyuki Wakaki; Tsuyoshi Ishikawa; Kazuya Nagaishi; Masanori Kaneko; Yuta Isaji; Yoshito Chikaraishi; Naohiko Ohkouchi
Magnesium isotopic variation in marine fish organs
Progress in Earth and Planetary Science, 06 Mar. 2025
12, 1
[Reviewed]

Toshiki Koga; Yoshinori Takano; Nanako O. Ogawa; Emily H. Hollingsworth; Yasuhiro Oba; Naohiko Ohkouchi
Compound-Specific Carbon and Nitrogen Isotopic Analyses of Underivatized Pyrimidine and Purine Nucleobases
ACS Earth and Space Chemistry, 03 Mar. 2025
9, 3, 424, 432
[Reviewed]

Maria Luisa Garcia Tejada; Kotaro Shirai; Atsushi Ando; Katsuhiko Suzuki; Nanako O OGAWA; Junichiro Kuroda; Naohiko Ohkouchi; Hironao Matsumoto; Akira Ishikawa
Multidisciplinary evidence for synchroneity between Ontong Java Nui volcanism and early Aptian oceanic anoxic event 1a
Science Advances, 26 Feb. 2025
[Reviewed]

Yuta Isaji; Koji Sugie; Naoto F. Ishikawa; Nanako O. Ogawa; Kazuhiko Matsumoto; Chisato Yoshikawa; Hajime Obata; Makio C. Honda; Naohiko Ohkouchi
Distributions of heme B and its implications on Fe biogeochemistry in the eastern Indian Ocean and the western North Pacific Ocean
Progress in Earth and Planetary Science, 11 Feb. 2025
12, 1
[Reviewed]

Hidetaka Nomaki; Yoshito Chikaraishi; Nanako O. Ogawa; Koh Maki; Motohiro Shimanaga; Hisami Suga; Masashi Tsuchiya; Toshi Nagata; Naohiko Ohkouchi
Differential use of multiple food sources at a bathyal benthic ecosystem in the central Sagami Bay revealed by amino acid nitrogen isotopic compositions
Progress in Earth and Planetary Science, 15 Jan. 2025
12, 1
[Reviewed]

Aymeric Pierre Marie Servettaz; Yuta Isaji; Chisato Yoshikawa; Yanghee Jang; Boo-Keun Khim; Yeongjun Ryu; Daniel M. Sigman; Nanako O. Ogawa; Francisco J. Jiménez-Espejo; Naohiko Ohkouchi
Sea ice and mixed layer depth influence on nitrate depletion and associated isotopic effects in the Drake Passage – Weddell Sea region, Southern Ocean
06 Dec. 2024
[Reviewed]

Juan Ochando; Francisco J. Jiménez-Espejo; Francisco Giles-Guzmán; Carlos Neto de Carvalho; Jose S. Carrión; Fernando Muñiz; Juan Manuel Rubiales; Pedro Cura; João Belo; Stewart Finlayson; Belen Martrat; Barend L. van Drooge; Gonzalo Jiménez-Moreno; Antonio García-Alix; Jose Antonio Lozano Rodríguez; Rosa María Albert; Naohiko Ohkouchi; Nanako Ogawa; Hisami Suga; Jon Camuera; Francisca Martínez-Ruiz; Joan Villanueva; Oriol Teruel; Nina Davtian; Noel Moreira; Zain Belaústegui; Joaquín Rodríguez-Vidal; Manuel Munuera; Alex Menez; Geraldine Finlayson; Clive Finlayson
A Neanderthal's specialised burning structure compatible with tar obtention
Quaternary Science Reviews, Dec. 2024
346, 109025, 109025
[Reviewed]

Yuchen Sun; Thomas M. Blattmann; Yoshinori Takano; Nanako O. Ogawa; Yuta Isaji; Naoto F. Ishikawa; Naohiko Ohkouchi
Enantiomer-Specific Stable Carbon and Nitrogen Isotopic Analyses of Underivatized Individual l- and d-Amino Acids by HPLC + HPLC Separation and Nano-EA/IRMS
Analytical Chemistry, 15 Nov. 2024
[Reviewed]

Miyabi Nakabayashi; Takumi Tsutaya; Abdul Hamid Ahmad; Yoko Sasaki; Nanako O. Ogawa; Naoto F. Ishikawa; Naohiko Ohkouchi
Dietary partitioning in sympatric Paradoxurinae civets in Borneo suggested by compound-specific nitrogen isotope analysis of amino acids
Progress in Earth and Planetary Science, 02 Oct. 2024
11, 1
[Reviewed]

Toshihiro Yoshimura; Daisuke Araoka; Hiroshi Naraoka; Saburo Sakai; Nanako O. Ogawa; Hisayoshi Yurimoto; Mayu Morita; Morihiko Onose; Tetsuya Yokoyama; Martin Bizzarro; Satoru Tanaka; Naohiko Ohkouchi; Toshiki Koga; Jason P. Dworkin; Tomoki Nakamura; Takaaki Noguchi; Ryuji Okazaki; Hikaru Yabuta; Kanako Sakamoto; Toru Yada; Masahiro Nishimura; Aiko Nakato; Akiko Miyazaki; Kasumi Yogata; Masanao Abe; Tatsuaki Okada; Tomohiro Usui; Makoto Yoshikawa; Takanao Saiki; Satoshi Tanaka; Fuyuto Terui; Satoru Nakazawa; Sei-ichiro Watanabe; Yuichi Tsuda; Shogo Tachibana; Yoshinori Takano
Breunnerite grain and magnesium isotope chemistry reveal cation partitioning during aqueous alteration of asteroid Ryugu
Nature Communications, 05 Sep. 2024
[Reviewed]

Naohiko Ohkouchi; Yuta Isaji; Nanako O. Ogawa
Regulation of nitrogen isotopic ratios of cellular components
Progress in Earth and Planetary Science, 22 Aug. 2024
11, 1
[Reviewed]

Shinya Yamamoto; Yosuke Miyairi; Yusuke Yokoyama; Yukihiko Serisawa; Hisami Suga; Nanako O. Ogawa; Naohiko Ohkouchi
Compound-specific radiocarbon analysis of sedimentary fatty acids: Potential as a dating tool for lake sediments of Mt. Fuji volcanic region, Japan
Organic Geochemistry, Aug. 2024
104860, 104860
[Reviewed]

Kai Nils Nitzsche; Toshihiro Yoshimura; Naoto F. Ishikawa; Hodaka Kawahata; Nanako O. Ogawa; Katsuhiko Suzuki; Daisuke Araoka; Naohiko Ohkouchi
Zinc isotope fractionation during the sorption of Zn to minerals and organic matter in sediment cores affected by anthropogenic pollution
Applied Geochemistry, Aug. 2024
169, 106047, 106047
[Reviewed]

Yoshinori Takano; Hiroshi Naraoka; Jason P. Dworkin; Toshiki Koga; Kazunori Sasaki; Hajime Sato; Yasuhiro Oba; Nanako O. Ogawa; Toshihiro Yoshimura; Kenji Hamase; Naohiko Ohkouchi; Eric T. Parker; José C. Aponte; Daniel P. Glavin; Yoshihiro Furukawa; Junken Aoki; Kuniyuki Kano; Shin-ichiro M. Nomura; Francois-Regis Orthous-Daunay; Philippe Schmitt-Kopplin; Aogu Furusho; Minako Hashiguchi; Kazuhiko Fukushima; Dan Aoki; Hannah L. McLain; Jamie E. Elsila; Heather V. Graham; John M. Eiler; Norbert Hertkorn; Alexander Ruf; Cédric Wolters; Junko Isa; Véronique Vuitton; Roland Thissen; Saburo Sakai; Haruna Sugahara; Hajime Mita; Yoshito Chikaraishi; Takaaki Yoshikawa; Satoru Tanaka; Mayu Morita; Morihiko Onose; Daisuke Araoka; Fumie Kabashima; Kosuke Fujishima; Hajime Sato; Tomoya Yamazaki; Yuki Kimura; Hisayoshi Yurimoto; Tomoki Nakamura; Takaaki Noguchi; Ryuji Okazaki; Hikaru Yabuta; Kanako Sakamoto; Toru Yada; Masahiro Nishimura; Aiko Nakato; Akiko Miyazaki; Kasumi Yogata; Masanao Abe; Tatsuaki Okada; Tomohiro Usui; Makoto Yoshikawa; Takanao Saiki; Satoshi Tanaka; Fuyuto Terui; Satoru Nakazawa; Sei-ichiro Watanabe; Yuichi Tsuda; Shogo Tachibana
Primordial aqueous alteration recorded in water-soluble organic molecules from the carbonaceous asteroid (162173) Ryugu
Nature Communications, 10 Jul. 2024
15, 1
[Reviewed]

P Methou; NO Ogawa; H Nomaki; N Ohkouchi; C Chen; K Schnabel
Genetic connectivity and isotopic niches of alvinocaridid shrimps from chemosynthetic habitats in Aotearoa/New Zealand, with a new Alvinocaris species
Marine Ecology Progress Series, 04 Jul. 2024
739, 85, 109
[Reviewed]

Aogu Furusho; Chiharu Ishii; Takeyuki Akita; Mai Oyaide; Masashi Mita; Hiroshi Naraoka; Yoshinori Takano; Jason P. Dworkin; Yasuhiro Oba; Toshiki Koga; Kazuhiko Fukushima; Dan Aoki; Minako Hashiguchi; Hajime Mita; Yoshito Chikaraishi; Naohiko Ohkouchi; Nanako O. Ogawa; Saburo Sakai; Daniel P. Glavin; Jamie E. Elsila; Eric T. Parker; José C. Aponte; Hannah L. McLain; Francois-Regis Orthous-Daunay; Véronique Vuitton; Roland Thissen; Cédric Wolters; Philippe Schmitt-Kopplin; Alexander Ruf; Junko Isa; Norbert Hertkorn; John M. Eiler; Toshihiro Yoshimura; Haruna Sugahara; Heather V. Graham; Yoshihiro Furukawa; Daisuke Araoka; Satoru Tanaka; Takaaki Yoshikawa; Fumie Kabashima; Kazunori Sasaki; Hajime Sato; Tomoya Yamazaki; Morihiko Onose; Mayu Morita; Yuki Kimura; Kuniyuki Kano; Junken Aoki; Kosuke Fujishima; Shin-ichiro Nomura; Shogo Tachibana; Tomoki Nakamura; Takaaki Noguchi; Ryuji Okazaki; Hikaru Yabuta; Hisayoshi Yurimoto; Kanako Sakamoto; Toru Yada; Masahiro Nishimura; Aiko Nakato; Akiko Miyazaki; Kasumi Yogata; Masanao Abe; Tomohiro Usui; Makoto Yoshikawa; Takanao Saiki; Satoshi Tanaka; Fuyuto Terui; Satoru Nakazawa; Tatsuaki Okada; Sei-ichiro Watanabe; Yuichi Tsuda; Kenji Hamase
Enantioselective three-dimensional high-performance liquid chromatographic determination of amino acids in the Hayabusa2 returned samples from the asteroid Ryugu
Journal of Chromatography Open, May 2024
5, 100134, 100134
[Reviewed]

Hidetaka Nomaki; Chong Chen; Nanako O. Ogawa; Yosuke Miyairi; Naohiko Ohkouchi; Akiko Makabe; Shinsuke Kawagucci; Yusuke Yokoyama; Motohiro Shimanaga
Elucidating carbon sources of hydrothermal vent animals using natural 14C abundances and habitat water temperature
Limnology and Oceanography, 19 Apr. 2024
[Reviewed]

Kai Nils Nitzsche; Naoto F Ishikawa; Toshihiro Yoshimura; Hiroto Kajita; Hodaka Kawahata; Nanako O Ogawa; Hisami Suga; Naohiko Ohkouchi
Historical trend of polycyclic aromatic hydrocarbons in a sediment core from Osaka Bay during the Meghalayan
The Holocene, 16 Mar. 2024
34, 7, 860, 869
[Reviewed]

Haruna Sugahara; Toshihiro Yoshimura; Yusuke Tamenori; Yoshinori Takano; Nanako O. Ogawa; Yoshito Chikaraishi; Naohiko Ohkouchi
Nitrogen K-edge X-ray adsorption near-edge structure spectroscopy of chemically adsorbed ammonia gas on clay minerals and the 15N/14N-nitrogen isotopic fractionation
Analytical Sciences, 05 Feb. 2024
40, 4, 781, 789
[Reviewed]

NF Ishikawa; C Chen; R Hashimoto; NO Ogawa; D Uyeno; H Nomaki
Amino acid nitrogen isotopic compositions show seep copepods gain nutrition from host animals
Marine Ecology Progress Series, 25 Jan. 2024
727, 81, 90
[Reviewed]

Takeru Kochi; Toshihiro Yoshimura; Nanako O. Ogawa; Naohiko Ohkouchi; Yasuyuki Kobayashi; Junichiro Kuroda
Carbonate Associated Sulfate Extraction Method Using Weakly Acidic Cation Exchange Resins
Geostandards and Geoanalytical Research, 30 Nov. 2023
48, 1, 77, 89
[Reviewed]

Toshihiro Yoshimura; Yoshinori Takano; Hiroshi Naraoka; Toshiki Koga; Daisuke Araoka; Nanako O. Ogawa; Philippe Schmitt-Kopplin; Norbert Hertkorn; Yasuhiro Oba; Jason P. Dworkin; José C. Aponte; Takaaki Yoshikawa; Satoru Tanaka; Naohiko Ohkouchi; Minako Hashiguchi; Hannah McLain; Eric T. Parker; Saburo Sakai; Mihoko Yamaguchi; Takahiro Suzuki; Tetsuya Yokoyama; Hisayoshi Yurimoto; Tomoki Nakamura; Takaaki Noguchi; Ryuji Okazaki; Hikaru Yabuta; Kanako Sakamoto; Toru Yada; Masahiro Nishimura; Aiko Nakato; Akiko Miyazaki; Kasumi Yogata; Masanao Abe; Tatsuaki Okada; Tomohiro Usui; Makoto Yoshikawa; Takanao Saiki; Satoshi Tanaka; Fuyuto Terui; Satoru Nakazawa; Sei-ichiro Watanabe; Yuichi Tsuda; Shogo Tachibana; Kenji Hamase; Aogu Furusho; Kazuhiko Fukushima; Dan Aoki; Daniel P. Glavin; Hannah L. McLain; Jamie E. Elsila; Heather V. Graham; John M. Eiler; Alexander Ruf; Francois-Regis Orthous-Daunay; Cédric Wolters; Junko Isa; Véronique Vuitton; Roland Thissen; Haruna Sugahara; Hajime Mita; Yoshihiro Furukawa; Yoshito Chikaraishi; Mayu Morita; Morihiko Onose; Fumie Kabashima; Kosuke Fujishima; Hajime Sato; Kazunori Sasaki; Kuniyuki Kano; Shin-ichiro M. Nomura; Junken Aoki; Tomoya Yamazaki; Yuki Kimura
Chemical evolution of primordial salts and organic sulfur molecules in the asteroid 162173 Ryugu
Nature Communications, 18 Sep. 2023
14, 1
[Reviewed]

Akihiro Tame; Tadashi Maruyama; Tetsuro Ikuta; Yoshihito Chikaraishi; Nanako O Ogawa; Masashi Tsuchiya; Kiyotaka Takishita; Miwako Tsuda; Miho Hirai; Yoshihiro Takaki; Naohiko Ohkouchi; Katsunori Fujikura; Takao Yoshida
mTORC1 regulates phagosome digestion of symbiotic bacteria for intracellular nutritional symbiosis in a deep-sea mussel.
Science advances, 25 Aug. 2023
9, 34, eadg8364
[Reviewed]

Yuchen Sun; Nanako O. Ogawa; Naoto F. Ishikawa; Thomas M. Blattmann; Yoshinori Takano; Naohiko Ohkouchi
Application of a porous graphitic carbon column to carbon and nitrogen isotope analysis of underivatized individual amino acids using high‐performance liquid chromatography coupled with elemental analyzer/isotope ratio mass spectrometry
Rapid Communications in Mass Spectrometry, 02 Aug. 2023
37, 17

Yuto Kaku; Noriyuki Isobe; Nanako O. Ogawa; Naohiko Ohkouchi; Tetsuro Ikuta; Tsuguyuki Saito; Shuji Fujisawa
Chitin nanofiber-coated biodegradable polymer microparticles via one-pot aqueous process
Carbohydrate Polymers, Jul. 2023
312, 120828, 120828

Yasuhiro Oba; Toshiki Koga; Yoshinori Takano; Nanako O. Ogawa; Naohiko Ohkouchi; Kazunori Sasaki; Hajime Sato; Daniel P. Glavin; Jason P. Dworkin; Hiroshi Naraoka; Shogo Tachibana; Hisayoshi Yurimoto; Tomoki Nakamura; Takaaki Noguchi; Ryuji Okazaki; Hikaru Yabuta; Kanako Sakamoto; Toru Yada; Masahiro Nishimura; Aiko Nakato; Akiko Miyazaki; Kasumi Yogata; Masanao Abe; Tatsuaki Okada; Tomohiro Usui; Makoto Yoshikawa; Takanao Saiki; Satoshi Tanaka; Fuyuto Terui; Satoru Nakazawa; Sei-ichiro Watanabe; Yuichi Tsuda
Uracil in the carbonaceous asteroid (162173) Ryugu
Nature Communications, 21 Mar. 2023
14, 1

Hiroshi Naraoka; Yoshinori Takano; Jason P. Dworkin; Yasuhiro Oba; Kenji Hamase; Aogu Furusho; Nanako O. Ogawa; Minako Hashiguchi; Kazuhiko Fukushima; Dan Aoki; Philippe Schmitt-Kopplin; José C. Aponte; Eric T. Parker; Daniel P. Glavin; Hannah L. McLain; Jamie E. Elsila; Heather V. Graham; John M. Eiler; Francois-Regis Orthous-Daunay; Cédric Wolters; Junko Isa; Véronique Vuitton; Roland Thissen; Saburo Sakai; Toshihiro Yoshimura; Toshiki Koga; Naohiko Ohkouchi; Yoshito Chikaraishi; Haruna Sugahara; Hajime Mita; Yoshihiro Furukawa; Norbert Hertkorn; Alexander Ruf; Hisayoshi Yurimoto; Tomoki Nakamura; Takaaki Noguchi; Ryuji Okazaki; Hikaru Yabuta; Kanako Sakamoto; Shogo Tachibana; Harold C. Connolly; Dante S. Lauretta; Masanao Abe; Toru Yada; Masahiro Nishimura; Kasumi Yogata; Aiko Nakato; Miwa Yoshitake; Ayako Suzuki; Akiko Miyazaki; Shizuho Furuya; Kentaro Hatakeda; Hiromichi Soejima; Yuya Hitomi; Kazuya Kumagai; Tomohiro Usui; Tasuku Hayashi; Daiki Yamamoto; Ryota Fukai; Kohei Kitazato; Seiji Sugita; Noriyuki Namiki; Masahiko Arakawa; Hitoshi Ikeda; Masateru Ishiguro; Naru Hirata; Koji Wada; Yoshiaki Ishihara; Rina Noguchi; Tomokatsu Morota; Naoya Sakatani; Koji Matsumoto; Hiroki Senshu; Rie Honda; Eri Tatsumi; Yasuhiro Yokota; Chikatoshi Honda; Tatsuhiro Michikami; Moe Matsuoka; Akira Miura; Hirotomo Noda; Tetsuya Yamada; Keisuke Yoshihara; Kosuke Kawahara; Masanobu Ozaki; Yu-ichi Iijima; Hajime Yano; Masahiko Hayakawa; Takahiro Iwata; Ryudo Tsukizaki; Hirotaka Sawada; Satoshi Hosoda; Kazunori Ogawa; Chisato Okamoto; Naoyuki Hirata; Kei Shirai; Yuri Shimaki; Manabu Yamada; Tatsuaki Okada; Yukio Yamamoto; Hiroshi Takeuchi; Atsushi Fujii; Yuto Takei; Kento Yoshikawa; Yuya Mimasu; Go Ono; Naoko Ogawa; Shota Kikuchi; Satoru Nakazawa; Fuyuto Terui; Satoshi Tanaka; Takanao Saiki; Makoto Yoshikawa; Sei-ichiro Watanabe; Yuichi Tsuda
Soluble organic molecules in samples of the carbonaceous asteroid (162173) Ryugu
Science, 24 Feb. 2023
379, 6634

Zeichner, S.S.; Aponte, J.C.; Bhattacharjee, S.; Dong, G.; Hofmann, A.E.; Dworkin, J.P.; Glavin, D.P.; Elsila, J.E.; Graham, H.V.; Naraoka, H.; Takano, Y.; Tachibana, S.; Karp, A.T.; Grice, K.; Holman, A.I.; Freeman, K.H.; Yurimoto, H.; Nakamura, T.; Noguchi, T.; Okazaki, R.; Yabuta, H.; Sakamoto, K.; Yada, T.; Nishimura, M.; Nakato, A.; Miyazaki, A.; Yogata, K.; Abe, M.; Okada, T.; Usui, T.; Yoshikawa, M.; Saiki, T.; Tanaka, S.; Terui, F.; Nakazawa, S.; Watanabe, S.-I.; Tsuda, Y.; Hamase, K.; Fukushima, K.; Aoki, D.; Hashiguchi, M.; Mita, H.; Chikaraishi, Y.; Ohkouchi, N.; Ogawa, N.O.; Sakai, S.; Parker, E.T.; McLain, H.L.; Orthous-Daunay, F.-R.; Vuitton, V.; Wolters, C.; Schmitt-Kopplin, P.; Hertkorn, N.; Thissen, R.; Ruf, A.; Isa, J.; Oba, Y.; Koga, T.; Yoshimura, T.; Araoka, D.; Sugahara, H.; Furusho, A.; Furukawa, Y.; Aoki, J.; Kano, K.; Nomura, S.-I.M.; Sasaki, K.; Sato, H.; Yoshikawa, T.; Tanaka, S.; Morita, M.; Onose, M.; Kabashima, F.; Fujishima, K.; Yamazaki, T.; Kimura, Y.; Eiler, J.M.
Polycyclic aromatic hydrocarbons in samples of Ryugu formed in the interstellar medium
Science, 2023
382, 6677

Schmitt-Kopplin, P.; Hertkorn, N.; Harir, M.; Moritz, F.; Lucio, M.; Bonal, L.; Quirico, E.; Takano, Y.; Dworkin, J.P.; Naraoka, H.; Tachibana, S.; Nakamura, T.; Noguchi, T.; Okazaki, R.; Yabuta, H.; Yurimoto, H.; Sakamoto, K.; Yada, T.; Nishimura, M.; Nakato, A.; Miyazaki, A.; Yogata, K.; Abe, M.; Usui, T.; Yoshikawa, M.; Saiki, T.; Tanaka, S.; Terui, F.; Nakazawa, S.; Okada, T.; Watanabe, S.-I.; Tsuda, Y.; Hamase, K.; Furusho, A.; Hashiguchi, M.; Fukushima, K.; Aoki, D.; Aponte, J.C.; Parker, E.T.; Glavin, D.P.; McLain, H.L.; Elsila, J.E.; Graham, H.V.; Eiler, J.M.; Ruf, A.; Orthous-Daunay, F.-R.; Isa, J.; Vuitton, V.; Thissen, R.; Ogawa, N.O.; Sakai, S.; Yoshimura, T.; Koga, T.; Sugahara, H.; Ohkouchi, N.; Mita, H.; Furukawa, Y.; Oba, Y.
Soluble organic matter Molecular atlas of Ryugu reveals cold hydrothermalism on C-type asteroid parent body
Nature Communications, 2023
14, 1

Hidetaka Nomaki; Kento Kawatani; Yusuke Motomura; Akihiro Tame; Daisuke Uyeno; Nanako O. Ogawa; Naohiko Ohkouchi; Motohiro Shimanaga
Bacterivory of the hydrothermal-vent-specific copepod Stygiopontius senokuchiae (Dirivultidae, Siphonostomatoida) from copepodite through adult stages
Journal of the Marine Biological Association of the United Kingdom, Jan. 2023
103, e21, 1, 12
[Reviewed]

Jun Matsubayashi; Katsuya Kimura; Naohiko Ohkouchi; Nanako O. Ogawa; Naoto F. Ishikawa; Yoshito Chikaraishi; Yuichi Tsuda; Hiroshi Minami
Using geostatistical analysis for simultaneous estimation of isoscapes and ontogenetic shifts in isotope ratios of highly migratory marine fish
Frontiers in Marine Science, 28 Nov. 2022
9

Kai Nils Nitzsche; Toshihiro Yoshimura; Naoto F. Ishikawa; Hiroto Kajita; Hodaka Kawahata; Nanako O. Ogawa; Katsuhiko Suzuki; Yusuke Yokoyama; Naohiko Ohkouchi
Metal contamination in a sediment core from Osaka Bay during the last 400 years
Progress in Earth and Planetary Science, 29 Oct. 2022
9, 1

Chisato Yoshikawa; Nanako O. Ogawa; Yoshito Chikaraishi; Akiko Makabe; Yohei Matsui; Yoshikazu Sasai; Masahide Wakita; Makio C. Honda; Yoshihisa Mino; Maki N. Aita; Tetsuichi Fujiki; Takuro Nunoura; Naomi Harada; Naohiko Ohkouchi
Nitrogen Isotopes of Sinking Particles Reveal the Seasonal Transition of the Nitrogen Source for Phytoplankton
Geophysical Research Letters, 16 Sep. 2022
49, 17

Takumi Tsutaya; Anna Wong; Peter T. Malim; Henry Bernard; Nanako O. Ogawa; Naohiko Ohkouchi; Shun Hongo; Tomoyuki Tajima; Tomoko Kanamori; Noko Kuze
Stable isotopic investigation of the feeding ecology of wild Bornean orangutans
American Journal of Biological Anthropology, 10 Aug. 2022
179, 2, 276, 290
[Reviewed]

Minako Hashiguchi; Dan Aoki; Kazuhiko Fukushima; Hiroshi Naraoka; Yoshinori Takano; Dworkin P. Jason; Aponte C. Jose; Elsila E. Jamie; Eiler M. John; Yoshihiro Furukawa; Aogu Furusho; Glavin P. Daniel; Heather V. Graham; Kenji Hamase; Hertkorn Norbert; Junko Isa; Toshiki Koga; McLain L. Hannah; Hajime Mita; Yasuhiro Oba; Nanako O. Ogawa; Naohiko Ohkouchi; Francois-Regis Orthous-Daunay; Eric T. Parker; Ruf Alexander; Saburo Sakaki; Schmitt-Kopplin Philippe; Haruna Sugahara; Thissen Roland; Vuitton Véronique; Cédric Wolters; Toshihiro Yoshimura; Hisayoshi Yurimoto; Tomoki Nakamura; Takaaki Noguchi; Ryuji Okazaki; Hikaru Yabuta; Kanako Sakamoto; Shogo Tachibana; Toru Yada; Masahiro Nishimura; Aiko Nakato; Akiko Miyazaki; Kasumi Yogata; Masanao Abe; Tomohiro Usui; Makoto Yoshikawa; Takanao Saiki; Satoshi Tanaka; Fuyuto Terui; Satoru Nakazawa; Sei-ichiro Watanabe; Yuichi Tsuda
The spatial distribution of soluble organic matter and its relationship to minerals in the asteroid (162173) Ryugu.
Earth, Planets and Space, 25 Jul. 2022
75, 1

Naoto F. Ishikawa; Nanako O. Ogawa; Yuchen Sun; Yoshito Chikaraishi; Yoshinori Takano; Naohiko Ohkouchi
Integrative assessment of amino acid nitrogen isotontegrative assessment of amino acid nitrogen isotopic composition in biological tissue samples determined by GC/C/IRMS, LC × EA/IRMS, and LC × GC/C/IRMS
Limnology and Oceanography: Methods, 19 Jul. 2022
20, 9
[Reviewed]

Yuta Isaji; C. Yoshikawa; N. O. Ogawa; K. Matsumoto; A. Makabe; S. Toyoda; N. F. Ishikawa; H. Ogawa; H. Saito; M. C. Honda; N. Ohkouchi
Nitrogen Sources for Phytoplankton in the Eastern Indian Ocean Determined From δ 15 N of Chlorophyll a and Divinylchlorophyll a
Geochemistry, Geophysics, Geosystems, Apr. 2022
23, 4

Yota Harada; Shin-ichi Ito; Nanako O. Ogawa; Chisato Yoshikawa; Naoto F. Ishikawa; Michio Yoneda; Naohiko Ohkouchi
Compound-Specific Nitrogen Isotope Analysis of Amino Acids in Eye Lenses as a New Tool to Reconstruct the Geographic and Trophic Histories of Fish
Frontiers in Marine Science, 03 Feb. 2022
8

Kai Nitzsche; Toshihiro Yoshimura; Naoto Ishikawa; Hiroto Kajita; Nanako Ogawa; Katz Suzuki; Naohiko Ohkouchi
Zinc stable isotopes as tracers for Zn pollution in sediment cores from historically polluted Lake Biwa and Osaka Bay
Goldschmidt2022 abstracts, 2022

Hidetaka Nomaki; Eugenio Rastelli; Nanako O. Ogawa; Yohei Matsui; Masashi Tsuchiya; Elisabetta Manea; Cinzia Corinaldesi; Miho Hirai; Naohiko Ohkouchi; Roberto Danovaro; Takuro Nunoura; Teresa Amaro
In situ experimental evidences for responses of abyssal benthic biota to shifts in phytodetritus compositions linked to global climate change
Global Change Biology, Dec. 2021
27, 23, 6139, 6155

Atsushi Urai; Makoto Matsushita; Ho-Dong Park; Hiroyuki Imachi; Miyuki Ogawara; Hiroki Iwata; Masanori Kaneko; Nanako O. Ogawa; Naohiko Ohkouchi; Yoshinori Takano
Detection of planktonic coenzyme factor 430 in a freshwater lake: small-scale analysis for probing archaeal methanogenesis
Progress in Earth and Planetary Science, Dec. 2021
8, 1

Takumi Tsutaya; Nanako O. Ogawa; Toshiya Nomura; Mika Shimizu; Naohiko Ohkouchi; Noko Kuze
Carbon and nitrogen stable isotopic offsets between diet and hair/feces in captive orangutans
Primates, Nov. 2021
62, 6, 945, 954

Kai Nils Nitzsche; Toshihiro Yoshimura; Naoto F. Ishikawa; Nanako O. Ogawa; Katsuhiko Suzuki; Naohiko Ohkouchi
Trace metal geochemical and Zn stable isotope data as tracers for anthropogenic metal contributions in a sediment core from Lake Biwa, Japan
Applied Geochemistry, Nov. 2021
134, 105107, 105107

Izumi Endo; Itsuki Sakon; Takashi Onaka; Yuki Kimura; Seiji Kimura; Setsuko Wada; L. Andrew Helton; Ryan M. Lau; Yoko Kebukawa; Yasuji Muramatsu; Nanako O. Ogawa; Naohiko Ohkouchi; Masato Nakamura; Sun Kwok
On the Nature of Organic Dust in Novae
The Astrophysical Journal, 01 Aug. 2021
917, 2, 103, 103
[Reviewed]

Keisuke Koba; Kei Kinoshita; Yuji Onishi; Keitaro Fukushima; Ken’ichi Osaka; Naoko Matsuo; Kazuho Funakawa; Yugo Seko; Ayano Medo; Riyo Hirasawa; Nanako O Ogawa; Fujio Hyodo; Chikage Yoshimizu
Carbon and Nitrogen Isotope Analysis on Small Samples Using a Near-conventional EA-IRMS System
RADIOISOTOPES, 15 Jul. 2021
70, 4, 291, 299

Hidetaka Nomaki; Eugenio Rastelli; Andreia Alves; Hisami Suga; Sandra Ramos; Tomo Kitahashi; Masashi Tsuchiya; Nanako O. Ogawa; Yohei Matsui; Koji Seike; Norio Miyamoto; Cinzia Corinaldesi; Elisabetta Manea; Naohiko Ohkouchi; Roberto Danovaro; Takuro Nunoura; Teresa Amaro
Abyssal fauna, benthic microbes, and organic matter quality across a range of trophic conditions in the western Pacific ocean
Progress in Oceanography, Jul. 2021
195, 102591, 102591

Naoto F. Ishikawa; Nanako O. Ogawa; Yoshito Chikaraishi; Moto-omi Yamaguchi; Katsunori Fujikura; Yosuke Miyairi; Yusuke Yokoyama; Toshi Nagata; Naohiko Ohkouchi
Influences of Ocean Currents on the Diets of Demersal Fish Communities in the Western North Pacific Revealed by Their Muscle Carbon and Nitrogen Isotopic Compositions
Frontiers in Marine Science, 05 May 2021
8

Atsushi Urai; Yoshinori Takano; Hiroyuki Imachi; Shun'ichi Ishii; Yohei Matsui; Miyuki Ogawara; Eiji Tasumi; Yosuke Miyairi; Nanako O. Ogawa; Toshihiro Yoshimura; Fumio Inagaki; Yusuke Yokoyama; Kenjiro Kawano; Daisuke Murai; Ho Dong Park; Naohiko Ohkouchi
Origin of Deep Methane Associated with a Unique Community of Microorganisms in an Organic- And Iodine-Rich Aquifer
ACS Earth and Space Chemistry, 21 Jan. 2021
5, 1, 1, 11

Kan-Hsi Hsiung; Toshiya Kanamatsu; Ken Ikehara; Kazuko Usami; Chorng-Shern Horng; Naohiko Ohkouchi; Nanako O. Ogawa; Saneatsu Saito; Masafumi Murayama
X-ray fluorescence core scanning, magnetic signatures, and organic geochemistry analyses of Ryukyu Trench sediments: turbidites and hemipelagites
Progress in Earth and Planetary Science, 04 Jan. 2021
8, 1

Yoko Kebukawa; Michael E. Zolensky; Cyrena A. Goodrich; Motoo Ito; Nanako O. Ogawa; Yoshinori Takano; Naohiko Ohkouchi; Kento Kiryu; Motoko Igisu; Takazo Shibuya; Matthew A. Marcus; Takuji Ohigashi; James Martinez; Yu Kodama; Muawia H. Shaddad; Peter Jenniskens
Organic matter in carbonaceous chondrite lithologies of Almahata Sitta: Incorporation of previously unsampled carbonaceous chondrite lithologies into ureilitic regolith
Meteoritics and Planetary Science, 2021
56, 7, 1311, 1327

Yoshinori Takano; Yasuhiro Oba; Satoshi Furota; Hiroshi Naraoka; Nanako Ogawa; Thomas M. Blattmann; Naohiko Ohkouchi
Analytical development of seamless procedures on cation-exchange chromatography and ion-pair chromatography with high-precision mass spectrometry for short-chain peptides
International Journal of Mass Spectrometry, Jan. 2021
116529, 116529

Yuko Takizawa; Yoshinori Takano; Bohyung Choi; Prarthana S. Dharampal; Shawn A. Steffan; Nanako O. Ogawa; Naohiko Ohkouchi; Yoshito Chikaraishi
A new insight into isotopic fractionation associated with decarboxylation in organisms: implications for amino acid isotope approaches in biogeoscience
Progress in Earth and Planetary Science, Dec. 2020
7, 1

Yuchen Sun; Naoto F. Ishikawa; Nanako O. Ogawa; Hodaka Kawahata; Yoshinori Takano; Naohiko Ohkouchi
A method for stable carbon isotope measurement of underivatized individual amino acids by multi‐dimensional high‐performance liquid chromatography and elemental analyzer/isotope ratio mass spectrometry
Rapid Communications in Mass Spectrometry, 30 Oct. 2020
34, 20

Yuta Isaji; Nanako O. Ogawa; Yoshinori Takano; Naohiko Ohkouchi
Quantification and Carbon and Nitrogen Isotopic Measurements of Heme B in Environmental Samples
Analytical Chemistry, 18 Aug. 2020
92, 16, 11213, 11222

Naoto F. Ishikawa; Jacques C. Finlay; Hiromi Uno; Nanako O. Ogawa; Naohiko Ohkouchi; Ichiro Tayasu; Mary E. Power
Combined use of radiocarbon and stable carbon isotopes for the source mixing model in a stream food web
LIMNOLOGY AND OCEANOGRAPHY, Jul. 2020
65, 11, 2688, 2696
[Reviewed]

Jun Matsubayashi; Yutaka Osada; Kazuaki Tadokoro; Yoshiyuki Abe; Atsushi Yamaguchi; Kotaro Shirai; Kentaro Honda; Chisato Yoshikawa; Nanako O Ogawa; Naohiko Ohkouchi; Naoto F Ishikawa; Toshi Nagata; Hiroomi Miyamoto; Shigeto Nishino; Ichiro Tayasu
Tracking long-distance migration of marine fishes using compound-specific stable isotope analysis of amino acids.
Ecology letters, 24 Mar. 2020
[Reviewed]

Yuchen Sun; Naoto F. Ishikawa; Nanako O. Ogawa; Hodaka Kawahata; Yoshinori Takano; Naohiko Ohkouchi
High-precision compound-specific carbon isotopic analysis of underivatized amino acids using a multi-dimensional-HPLC and nano-EA/IRMS
23 Mar. 2020

Kenji Suetsugu; Jun Matsubayashi; Nanako O. Ogawa; Satoe Murata; Risa Sato; Hiroshi Tomimatsu
Isotopic evidence of arbuscular mycorrhizal cheating in a grassland gentian species
Oecologia, Mar. 2020
192, 4

Yoko Kebukawa; Michael E. Zolensky; Motoo Ito; Nanako O. Ogawa; Yoshinori Takano; Naohiko Ohkouchi; Aiko Nakato; Hiroki Suga; Yasuo Takeichi; Yoshio Takahashi; Kensei Kobayashi
Primordial organic matter in the xenolithic clast in the Zag H chondrite: Possible relation to D/P asteroids
Geochimica et Cosmochimica Acta, 15 Feb. 2020
271, 61, 77
[Reviewed]

Or M. Bialik; Gerald Auer; Nanako O. Ogawa; Dick Kroon; Nicolas D. Waldmann; Naohiko Ohkouchi
Monsoons, Upwelling, and the Deoxygenation of the Northwestern Indian Ocean in Response to Middle to Late Miocene Global Climatic Shifts
Paleoceanography and Paleoclimatology, 05 Feb. 2020
35, 2

Hiroto Kajita; Naomi Harada; Yusuke Yokoyama; Miyako Sato; Nanako Ogawa; Yosuke Miyairi; Chikako Sawada; Atsushi Suzuki; Hodaka Kawahata
High time-resolution alkenone paleotemperature variations in Tokyo Bay during the Meghalayan: Implications for cold climates and social unrest in Japan
QUATERNARY SCIENCE REVIEWS, Feb. 2020
230
[Reviewed]

Shinya Yamamoto; Yosuke Miyairi; Yusuke Yokoyama; Hisami Suga; Nanako O Ogawa; Naohiko Ohkouchi
Compound-specific radiocarbon analysis of organic compounds from Mount Fuji proximal lake (Lake Kawaguchi) sediment, central Japan　　　　　　　　　　　　　　　
Radiocarbon, 23 Jan. 2020
00, 00, 1, 13
[Reviewed]

Endo, I.; Sakon, I.; Onaka, T.; Helton, A.L.; Lau, R.M.; Kimura, S.; Wada, S.; Ogawa, N.; Ohkouchi, N.; Kebukawa, Y.
Quenched Nitrogen-included Carbonaceous Composite (QNCC): A powerful candidate of the carriers of the UIR bands in classical novae
Proceedings of the International Astronomical Union, 2020

Shinya Yamamoto; Yosuke Miyairi; Yusuke Yokoyama; Hisami Suga; Nanako O Ogawa; Naohiko Ohkouchi
Compound-Specific Radiocarbon Analysis of Organic Compounds from Mount Fuji Proximal Lake (Lake Kawaguchi) Sediment, Central Japan
Radiocarbon, Jan. 2020
62, 2, 439, 451

Isaji, Y.; Ogawa, N.O.; Boreham, C.J.; Kashiyama, Y.; Ohkouchi, N.
Evaluation of δ¹³C and δ¹⁵N Uncertainties Associated with the Compound-Specific Isotope Analysis of Geoporphyrins
Analytical Chemistry, 2020
92, 4, 3152, 3160
[Reviewed]

Matsumoto, Hironao; Kuroda, Junichiro; Coccioni, Rodolfo; Frontalini, Fabrizio; Sakai, Saburo; Ogawa, Nanako O.; Ohkouchi, Naohiko
Marine Os isotopic evidence for multiple volcanic episodes during Cretaceous Oceanic Anoxic Event 1b
Scientific Reports, 2020
10, 1

Y Hane; S Kimura; Y Yokoyama; Y Miyairi; T Ushikubo; T Ishimura; N Ogawa; T Aono; K Nishida
Reconstruction of temperature experienced by Pacific bluefin tuna Thunnus orientalis larvae using SIMS and microvolume CF-IRMS otolith oxygen isotope analyses
Marine Ecology Progress Series, 2020
[Reviewed]

Yoshihiro Furukawa; Yoshito Chikaraishi; Naohiko Ohkouchi; Nanako O. Ogawa; Daniel P. Glavin; Jason P. Dworkin; Chiaki Abe; Tomoki Nakamura
Extraterrestrial ribose and other sugars in primitive meteorites
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, Dec. 2019
116, 49, 24440, 24445
[Reviewed]

Sara K. E. Goulden; Naohiko Ohkouchi; Katherine H. Freeman; Yoshito Chikaraishi; Nanako O. Ogawa; Hisami Suga; Oliver Chadwick; Benjamin Z. Houlton
Strong correspondence between nitrogen isotope composition of foliage and chlorin across a rainfall gradient: implications for paleo-reconstruction of the nitrogen cycle
Biogeosciences, 08 Oct. 2019
16, 19

Ogawa N. O; Kebukawa Y; Zolensky M; Takano Y; Ohkouchi N
ISOTOPIC MEASUREMENTS OF < 100 ng CARBON AND NITROGEN THROUGH EA/IRMS AND ITS APPLICATION TO EXTRATERRESTRIAL MATERIALS.
METEORITICS & PLANETARY SCIENCE, Aug. 2019
54
[Reviewed]

Takano Y; Furota S; Ogawa N. O; Ohkouchi N
ANALYTICAL DEVELOPMENT OF UNDERIVATIZED AMINO ACIDS AND SHORT-CHAIN PEPTIDE MOLECULES
METEORITICS & PLANETARY SCIENCE, Aug. 2019
54
[Reviewed]

Nomaki Hidetaka; Uejima Yuki; Ogawa Nanako O; Yamane Masako; Watanabe Hiromi K; Senokuchi Reina; Bernhard Joan M; Kitahashi Tomo; Miyairi Yosuke; Yokoyama Yusuke; Ohkouchi Naohiko; Shimanaga Motohiro
Nutritional sources of meio- and macrofauna at hydrothermal vents and adjacent areas: natural-abundance radiocarbon and stable isotope analyses
MARINE ECOLOGY PROGRESS SERIES, 18 Jul. 2019
622, 49, 65
[Reviewed]

Isaji Yuta; Yoshimura Toshihiro; Araoka Daisuke; Kuroda Junichiro; Ogawa Nanako O; Kawahata Hodaka; Ohkouchi Naohiko
Magnesium Isotope Fractionation during Synthesis of Chlorophyll a and Bacteriochlorophyll a of Benthic Phototrophs in Hypersaline Environments
ACS EARTH AND SPACE CHEMISTRY, Jun. 2019
3, 6, 1073, 1079
[Reviewed]

Isaji Yuta; Kawahata Hodaka; Takano Yoshinori; Ogawa Nanako O; Kuroda Junichiro; Yoshimura Toshihiro; Lugli Stefano; Manzi Vinicio; Roveri Marco; Ohkouchi Naohiko
Diazotrophy Drives Primary Production in the Organic-Rich Shales Deposited Under a Stratified Environment During the Messinian Salinity Crisis (Vena del Gesso, Italy)
FRONTIERS IN EARTH SCIENCE, 07 May 2019
7
[Reviewed]

Takeuchi Riko; Chikaraishi Yoshito; Ogawa Nanako O; Furota Satoshi; Ohkouchi Naohiko; Aoki Motohide; Uchida Tatsuya; Umemura Tomonari; Kumata Hidetoshi
Development of a Purification Method for Compound Specific Carbon Isotope Analysis of Phytosterols and Long-chain n-fatty Acids in Higher Plants
BUNSEKI KAGAKU, May 2019
68, 5, 297, 306
[Reviewed]

Isaji Y; Kawahata H; Ogawa N. O; Kuroda J; Yoshimura T; Jimenez-Espejo F. J; Makabe A; Shibuya T; Lugli S; Santulli A; Manzi V; Roveri M; Ohkouchi N
Efficient recycling of nutrients in modern and past hypersaline environments
SCIENTIFIC REPORTS, 06 Mar. 2019
9, 1
[Reviewed]

Yoshinori Takano; Satoshi Furota; Nanako O. Ogawa; Naohiko Ohkouchi
Quest into peptide molecules: Unseen important targets in organic geochemistry
29th International Meeting on Organic Geochemistry, IMOG 2019, 2019

Y. Isaji; Y. Takano; N. O. Ogawa; N. Ohkouchi
Heme as one of the key molecules for constraining marine biogeochemical cycle　　　　　　　　　　　　　　　
29th International Meeting on Organic Geochemistry, IMOG 2019, 2019

A. Urai; Y. Takano; H. Imachi; S. Ishii; Y. Matsui; M. Ogawara; Y. Miyairi; N. O. Ogawa; T. Yoshimura; F. Inagaki; Y. Yokoyama; H. D. Park; D. Murai; K. Kawano; N. Ohkouchi
Deep methagenesis and iodine-rich aquifer: Insight from organic geochemical approach　　　　　　　　　　　　　　　
29th International Meeting on Organic Geochemistry, IMOG 2019, 2019

Endo, I.; Sakon, I.; Onaka, T.; Helton, A.L.; Lau, R.M.; Kimura, S.; Wada, S.; Ogawa, N.; Ohkouchi, N.; Kebukawa, Y.; Elmegreen, B.G.; T{\'o}th, L.V.; G{\"u}del, M.
Nitrogen-included Carbonaceous Compounds (NCC): Laboratory-synthesized organics as the probable candidate for the carrier of the UIR bands observed in dusty classical novae
Proceedings of the International Astronomical Union, 2019

Haruna Sugahara; Yoshinori Takano; Shogo Tachibana; Iyo Sugawara; Yoshito Chikaraishi; Nanako O. Ogawa; Naohiko Ohkouchi; Akira Kouchi; Hisayoshi Yurimoto
Molecular and isotopic compositions of nitrogen-containing organic molecules formed during UV-irradiation of simulated interstellar ice
Geochemical Journal, 2019
53, 1, 5, 20
[Reviewed]

Senokuchi Reina; Nomaki Hidetaka; Watanabe Hiromi Kayama; Kitahashi Tomo; Ogawa Nanako O; Shimanaga Motohiro
Chemoautotrophic food availability influences copepod assemblage composition at deep hydrothermal vent sites within sea knoll calderas in the northwestern Pacific
MARINE ECOLOGY PROGRESS SERIES, 06 Dec. 2018
607, 37, 51
[Reviewed]

I. Sakon; I. Endo; A. Ikeuchi; T. Onaka; Y. Kimura; S. Kimura; S. Wada; M. Nakamura; J. Ichimura; N. Ogawa; N. Ohkouchi; Y. Inatomi
Space Exposure Experiment of Carbonaceous Dust
Aeronautical and Space Sciences Japan, Dec. 2018
66, 12, 381, 387
[Reviewed]

Naoto F. Ishikawa; Yu Itahashi; Thomas M. Blattmann; Yoshinori Takano; Nanako O. Ogawa; Masako Yamane; Yusuke Yokoyama; Toshi Nagata; Minoru Yoneda; Negar Haghipour; Timothy I. Eglinton; Naohiko Ohkouchi
Improved Method for Isolation and Purification of Underivatized Amino Acids for Radiocarbon Analysis
Analytical Chemistry, 16 Oct. 2018
90, 20, 12035, 12041
[Reviewed]

Naoto F. Ishikawa; Yu Itahashi; Thomas M. Blattmann; Yoshinori Takano; Nanako O. Ogawa; Masako Yamane; Yusuke Yokoyama; Toshi Nagata; Minoru Yoneda; Negar Haghipour; Timothy I. Eglinton; Naohiko Ohkouchi
Improved Method for Isolation and Purification of Underivatized Amino Acids for Radiocarbon Analysis
Analytical Chemistry, 16 Oct. 2018
90, 20, 12035, 12041
[Reviewed]

Takano Yoshinori; Chikaraishi Yoshito; Imachi Hiroyuki; Miyairi Yosuke; Ogawa Nanako O; Kaneko Masanori; Yokoyama Yusuke; Krueger Martin; Ohkouchi Naohiko
Insight into anaerobic methanotrophy from C-13/C-12- amino acids and C-14/C-12-ANME cells in seafloor microbial ecology
SCIENTIFIC REPORTS, 24 Sep. 2018
8, 1
[Reviewed]

Furota Satoshi; Ogawa Nanako O; Takano Yoshinori; Yoshimura Toshihiro; Ohkouchi Naohiko
Quantitative analysis of underivatized amino acids in the sub- to several-nanomolar range by ion-pair HPLC using a corona-charged aerosol detector (HPLC-CAD)
JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES, 15 Sep. 2018
1095, 191, 197
[Reviewed]

Yasuhito Sekine; Kenya Kodama; Takamichi Kobayashi; Seiji Obata; Yu Chang; Nanako O. Ogawa; Yoshinori Takano; Naohiko Ohkouchi; Koichiro Saiki; Toshimori Sekine
An experimental study on impact-induced alterations of planetary organic simulants
Meteoritics and Planetary Science, 01 Jun. 2018
53, 6, 1267, 1282
[Reviewed]

Yusuke Kondo; Shoma Okada; Susumu Ohtsuka; Takeshi Hirabayashi; Aya Adachi; Makoto Urata; Sho Toshino; Hiroshi Miyake; Nanako O. Ogawa; Naohiko Ohkouchi
Piscivory of the Japanese giant box jellyfish Morbakka virulenta
PLANKTON & BENTHOS RESEARCH, May 2018
13, 2, 66, 74
[Reviewed]

Urai Atsushi; Yokoyama Yusuke; Murai Daisuke; Kawano Kenjiro; Ohkouchi Naohiko; Takano Yoshinori; Ishii Shunichi; Imachi Hiroyuki; Matsui Yohei; Miyairi Yosuke; Ogawa Nanako; Yoshimura Toshihiro; Inagaki Fumio
Deep methanogenesis and iodine aquifer: an organic geochemical approach
Abstracts of Annual Meeting of the Geochemical Society of Japan, 2018
65, 0, 177, 177

Ogawa Nanako O; Ohkouchi Naohiko; Nomaki Hidetaka; Chikaraishi Yoshito; Fujikura Katsunori; Kitazato Hiroshi
Polychlorinated biphenyls (PCBs) in deep-sea organisms and sediments off Tohoku after the Great East Japan Earthquake in 2011
NIPPON SUISAN GAKKAISHI, 2018
84, 5, 897, 900
[Reviewed]

Naohiko Ohkouchi; Yoshito Chikaraishi; Hilary G. Close; Brian Fry; Thomas Larsen; Daniel J. Madigan; Matthew D. McCarthy; Kelton W. McMahon; Toshi Nagata; Yuichi I. Naito; Nanako O. Ogawa; Brian N. Popp; Shawn Steffan; Yoshinori Takano; Ichiro Tayasu; Alex S. J. Wyatt; Yasuhiko T. Yamaguchi; Yusuke Yokoyama
Advances in the application of amino acid nitrogen isotopic analysis in ecological and biogeochemical studies
ORGANIC GEOCHEMISTRY, Nov. 2017
113, 150, 174
[Reviewed]

Caitlin J. Campbell; David M. Nelson; Nanako O. Ogawa; Yoshito Chikaraishi; Naohiko Ohkouchi
Trophic position and dietary breadth of bats revealed by nitrogen isotopic composition of amino acids
SCIENTIFIC REPORTS, Nov. 2017
7
[Reviewed]

Yasuhiko T. Yamaguchi; Yoshito Chikaraishi; Yoshinori Takano; Nanako O. Ogawa; Hiroyuki Imachi; Yusuke Yokoyama; Naohiko Ohkouchi
Fractionation of nitrogen isotopes during amino acid metabolism in heterotrophic and chemolithoautotrophic microbes across Eukarya, Bacteria, and Archaea: Effects of nitrogen sources and metabolic pathways
ORGANIC GEOCHEMISTRY, Sep. 2017
111, 101, 112
[Reviewed]

Yuta Isaji; Hodaka Kawahata; Junichiro Kuroda; Toshihiro Yoshimura; Nanako O. Ogawa; Atsushi Suzuki; Takazo Shibuya; Francisco J. Jimenez-Espejo; Stefano Lugli; Andrea Santulli; Vinicio Manzi; Marco Roveri; Naohiko Ohkouchi
Biological and physical modification of carbonate system parameters along the salinity gradient in shallow hypersaline solar salterns in Trapani, Italy
GEOCHIMICA ET COSMOCHIMICA ACTA, Jul. 2017
208, 354, 367
[Reviewed]

Haruna Sugahara; Yoshinori Takano; Nanako O. Ogawa; Yoshito Chikaraishi; Naohiko Ohkouchi
Nitrogen Isotopic Fractionation in Ammonia during Adsorption on Silicate Surfaces
ACS EARTH AND SPACE CHEMISTRY, Mar. 2017
1, 1, 24, 29
[Reviewed]

Makiko Ishikawa; Nanako O. Ogawa; Naohiko Ohkouchi; Daniel Edison M. Husana; Tomoki Kase
Stable carbon isotope compositions of foot tissue, conchiolin opercula, and organic matrix within the shells of two marine gastropods from a seagrass meadow in the Philippines
GEOCHEMICAL JOURNAL, 2017
51, 3
[Reviewed]

Furota Satoshi; O. Ogawa Nanako; Takano Yoshinori; Ohkouchi Naohiko
A highly sensitive method for quantification of underivatized amino acids by HPLC-CAD
Abstracts of Annual Meeting of the Geochemical Society of Japan, 2017
64, 80, 80

O. Ogawa Nanako; Yoshikawa Chisato; Hisami Suga; Makabe Akiko; Matsui Yohei; Kawagucci Shinsuke; Fujiki Tetsuichi; Harada Naomi; Ohkouchi Naohiko
Nitrogen isotopic composition of chlorophylls to reconstruct photosynthetic nitrogen cycle in the ocean
Abstracts of Annual Meeting of the Geochemical Society of Japan, 2017
64, 13, 13

Yoshikawa Chisato; Chikamoto Megumi; Etourneau Johan; Crosta Xavier; O. Nanako Ogawa; Naohiko Ohkouchi
An insight into the changes in surface nitrogen cycle in the Antarctic marginal sea over the past 2000 years based on a nitrogen isotopic model
Abstracts of Annual Meeting of the Geochemical Society of Japan, 2017
64, 12, 12

Sebastian Naeher; Hisami Suga; Nanako O. Ogawa; Yoshinori Takano; Carsten J. Schubert; Kliti Grice; Naohiko Ohkouchi
Distributions and compound-specific isotopic signatures of sedimentary chlorins reflect the composition of photoautotrophic communities and their carbon and nitrogen sources in Swiss lakes and the Black Sea
CHEMICAL GEOLOGY, Dec. 2016
443, 198, 209
[Reviewed]

Sebastian Naeher; Hisami Suga; Nanako O. Ogawa; Carsten J. Schubert; Kliti Grice; Naohiko Ohkouchi
Compound-specific carbon and nitrogen isotopic compositions of chlorophyll a and its derivatives reveal the eutrophication history of Lake Zurich (Switzerland)
CHEMICAL GEOLOGY, Dec. 2016
443, 210, 219
[Reviewed]

Sebastian Naeher; Hisami Suga; Nanako O. Ogawa; Carsten J. Schubert; Kliti Grice; Naohiko Ohkouchi
Compound-specific carbon and nitrogen isotopic compositions of chlorophyll a and its derivatives reveal the eutrophication history of Lake Zurich (Switzerland)
Chemical Geology, 21 Nov. 2016
441, 138, 147
[Reviewed]

Naohiko Ohkouchi; H. Shibata; Y. Chikaraishi; H. Nomaki; N. O. Ogawa; T. Nagata; T. Goto; K. Fujikura; H. Kitazato
A monitoring result of polychlorinated biphenyls (PCBs) in deep-sea organisms and sediments off Tohoku during 2012-2014: temporal variation and the relationship with the trophic position
JOURNAL OF OCEANOGRAPHY, Aug. 2016
72, 4, 629, 639
[Reviewed]

Chisato Yoshikawa; Hitomi Abe; Maki N. Aita; Florian Breider; Keichi Kuzunuki; Sakae Toyoda; Nanako O. Ogawa; Hisami Suga; Naohiko Ohkouchi; Sebastian O. Danielache; Masahide Wakita; Makio C. Honda; Naohiro Yoshida
Insight into nitrous oxide production processes in the western North Pacific based on a marine ecosystem isotopomer model
JOURNAL OF OCEANOGRAPHY, Jun. 2016
72, 3, 491, 508
[Reviewed]

Naoto F. Ishikawa; Hiroyuki Togashi; Yoshikazu Kato; Mayumi Yoshimura; Yukihiro Kohmatsu; Chikage Yoshimizu; Nanako O. Ogawa; Nobuhito Ohte; Naoko Tokuchi; Naohiko Ohkouchi; Ichiro Tayasu
Terrestrial-aquatic linkage in stream food webs along a forest chronosequence: multi-isotopic evidence
ECOLOGY, May 2016
97, 5, 1146, 1158
[Reviewed]

Ishikawa, N.F; Togashi, H; Kato, Y; Yoshimura, M; Kohmatsu, Y; Yoshimizu, C; Ogawa, N.O; Ohte, N; Tokuchi, N; Ohkouchi, N; Tayasu, I
Terrestrial-aquatic linkage in stream food webs along a forest chronosequence: multi-isotopic evidence
Ecology, May 2016
97, 5, 1146, 1158
[Reviewed]

Yusuke Kondo; Susumu Ohtsuka; Takeshi Hirabayashi; Shoma Okada; Nanako O. Ogawa; Naohiko Ohkouchi; Takeshi Shimazu; Jun Nishikawa
Seasonal changes in infection with trematode species utilizing jellyfish as hosts: evidence of transmission to definitive host fish via medusivory
PARASITE, Apr. 2016
23
[Reviewed]

Toshihiro Yoshimura; Junichiro Kuroda; Stefano Lugli; Yusuke Tamenori; Nanako O. Ogawa; Francisco J. Jimenez-Espejo; Yuta Isaji; Marco Roveri; Vinicio Manzi; Hodaka Kawahata; Naohiko Ohkouchi
An X-ray spectroscopic perspective on Messinian evaporite frm SU cUUy: Sedimentary fabrics, element distributions, and chemical environments of S and Mg
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS, Apr. 2016
17, 4, 1383, 1400
[Reviewed]

Queenie Hoi Shan Chan; Yoshito Chikaraishi; Yoshinori Takano; Nanako O. Ogawa; Naohiko Ohkouchi
Amino acid compositions in heated carbonaceous chondrites and their compound-specific nitrogen isotopic ratios
EARTH PLANETS AND SPACE, Jan. 2016
68
[Reviewed]

Masanori Kaneko; Yoshinori Takano; Nanako O. Ogawa; Yuki Sato; Naohiro Yoshida; Naohiko Ohkouchi
Estimation of methanogenesis by quantification of coenzyme F430 in marine sediments
GEOCHEMICAL JOURNAL, 2016
50, 6, 453, 460
[Reviewed]

宮地俊作; 馬谷原武之; 對馬孝治; 笹田勝寛; 河野英一; 川端淳; 力石嘉人; 小川奈々子; 大河内直彦
Estimating trophic level and food sources of the Japanese anchovy and the sardine based on bulk and amino acid nitrogen stable isotope analyses in the Northwestern Pacific Ocean
日本生物地理学会会報, 20 Dec. 2015
70, 33‐41, 41

Shunsaku Miyachi; Takeyuki Mayahara; Kouji Tsushima; Katsuhiro Sasada; Eiichi Kohno; Nanako O. Ogawa; Yoshito Chikaraishi; Naohiko Ohkouchi
Approach to determine individual trophic level and the difference in food sources of Japanese anchovy Engraulis japonicus in Sagami Bay, based on compound-specific nitrogen stable isotope analysis of amino acids
FISHERIES SCIENCE, Nov. 2015
81, 6, 1053, 1062
[Reviewed]

Yuta Isaji; Hodaka Kawahata; Naohiko Ohkouchi; Nanako O. Ogawa; Masafumi Murayama; Kazuki Inoue; Kensaku Tamaki
Varying responses to Indian monsoons during the past 220 kyr recorded in deep-sea sediments in inner and outer regions of the Gulf of Aden
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, Nov. 2015
120, 11, 7253, 7270
[Reviewed]

Chisato Yoshikawa; Hitomi Abe; Maki N. Aita; Florian Breider; Keichi Kuzunuki; Sakae Toyoda; Nanako O. Ogawa; Hisami Suga; Naohiko Ohkouchi; Sebastian O. Danielache; Masahide Wakita; Makio C. Honda; Naohiro Yoshida
Insight into nitrous oxide production processes in the western North Pacific based on a marine ecosystem isotopomer model
Journal of Oceanography, 08 Jul. 2015
72, 3, 1, 18
[Reviewed]

Svenja Kruse; Evgeny A. Pakhomov; Brian P. V. Hunt; Yoshito Chikaraishi; Nanako O. Ogawa; Ulrich Bathmann
Uncovering the trophic relationship between Themisto gaudichaudii and Salpa thompsoni in the Antarctic Polar Frontal Zone
MARINE ECOLOGY PROGRESS SERIES, Jun. 2015
529, 63, 74
[Reviewed]

Naohiko Ohkouchi; Nanako O. Ogawa; Yoshito Chikaraishi; Hiroyuki Tanaka; Eitaro Wada
Biochemical and physiological bases for the use of carbon and nitrogen isotopes in environmental and ecological studies
PROGRESS IN EARTH AND PLANETARY SCIENCE, Feb. 2015
2
[Reviewed]

akon, I; Sato, K; Onaka, T; Kimura, S; Wada, S; Ogawa, N.O; Ohkouchi, N; Pathak, A
Infrared Properties of laboratory-synthesizedNitrogen-containing Carbonaceous Composites (NCCs).
Asian Journal of Physics, 2015
24, 8, 1143, 1150
[Reviewed]

Junichiro Kuroda; Natsuko Ihoriya; Rie S. Hori; Nanako O. Ogawa; Minoru Ikehara; Masaharu Tanimizu; Naohiko Ohkouchi
Geochemistry of an Aptian bedded chert succession from the deep Pacifi c basin: New insights into Cretaceous oceanic anoxic event (OAE) 1a
Special Paper of the Geological Society of America, 2015
511, 305, 328
[Reviewed]

N. F. Ishikawa; M. Yamane; H. Suga; N. O. Ogawa; Y. Yokoyama; N. Ohkouchi
Chlorophyll a-specific Delta C-14, delta C-13 and delta N-15 values in stream periphyton: implications for aquatic food web studies
BIOGEOSCIENCES, 2015
12, 22, 6781, 6789
[Reviewed]

Yuka Setoguchi; Hidetaka Nomaki; Tomo Kitahashi; Hiromi Watanabe; Koji Inoue; Nanako O. Ogawa; Motohiro Shimanaga
Nematode community composition in hydrothermal vent and adjacent non-vent fields around Myojin Knoll, a seamount on the Izu-Ogasawara Arc in the western North Pacific Ocean
MARINE BIOLOGY, Aug. 2014
161, 8, 1775, 1785
[Reviewed]

Yoshito Chikaraishi; Shawn A. Steffan; Nanako O. Ogawa; Naoto F. Ishikawa; Yoko Sasaki; Masashi Tsuchiya; Naohiko Ohkouchi
High-resolution food webs based on nitrogen isotopic composition of amino acids
ECOLOGY AND EVOLUTION, Jun. 2014
4, 12, 2423, 2449
[Reviewed]

Masanori Kaneko; Yoshinori Takano; Yoshito Chikaraishi; Nanako O. Ogawa; Susumu Asakawa; Takeshi Watanabe; Seigo Shima; Martin Krueger; Makoto Matsushita; Hiroyuki Kimura; Naohiko Ohkouchi
Quantitative Analysis of Coenzyme F430 in Environmental Samples: A New Diagnostic Tool for Methanogenesis and Anaerobic Methane Oxidation
ANALYTICAL CHEMISTRY, Apr. 2014
86, 7, 3633, 3638
[Reviewed]

Nanako O. Ogawa; Y. Chikaraishi; N. Ohkouchi
Trophic position estimates of formalin-fixed samples with nitrogen isotopic compositions of amino acids: an application to gobiid fish (Isaza) in Lake Biwa, Japan
ECOLOGICAL RESEARCH, Sep. 2013
28, 5, 697, 702
[Reviewed]

Kosuke T. Goto; Yasuhito Sekine; Katsuhiko Suzuki; Eiichi Tajika; Ryoko Senda; Tatsuo Nozaki; Ryuji Tada; Kazuhisa Goto; Shinji Yamamoto; Teruyuki Maruoka; Naohiko Ohkouchi; Nanako O. Ogawa
Redox conditions in the atmosphere and shallow-marine environments during the first Huronian deglaciation: Insights from Os isotopes and redox-sensitive elements
Earth and Planetary Science Letters, 05 Aug. 2013
376, 145, 154
[Reviewed]

Kosuke Kurosawa; Seiji Sugita; Ko Ishibashi; Sunao Hasegawa; Yasuhito Sekine; Nanako O. Ogawa; Toshihiko Kadono; Sohsuke Ohno; Naohiko Ohkouchi; Yoichi Nagaoka; Takafumi Matsui
Hydrogen Cyanide Production due to Mid-Size Impacts in a Redox-Neutral N-2-Rich Atmosphere
ORIGINS OF LIFE AND EVOLUTION OF BIOSPHERES, Jun. 2013
43, 3, 221, 245
[Reviewed]

Eitaro Wada; Reiichiro Ishii; Maki Noguchi Aita; Nanako O. Ogawa; Ayato Kohzu; Fujio Hyodo; Yoshihiro Yamada
Possible ideas on carbon and nitrogen trophic fractionation of food chains: a new aspect of food-chain stable isotope analysis in Lake Biwa, Lake Baikal, and the Mongolian grasslands
ECOLOGICAL RESEARCH, Mar. 2013
28, 2, 173, 181
[Reviewed]

Michael J. Miller; Yoshito Chikaraishi; Nanako O. Ogawa; Yoshiaki Yamada; Katsumi Tsukamoto; Naohiko Ohkouchi
A low trophic position of Japanese eel larvae indicates feeding on marine snow
BIOLOGY LETTERS, Feb. 2013
9, 1, 20120826
[Reviewed]

Yoshinori Takano; Jonathan James Tyler; Hisaya Kojima; Yusuke Yokoyama; Yukiko Tanabe; Takaharu Sato; Nanako O. Ogawa; Naohiko Ohkouchi; Manabu Fukui
Holocene lake development and glacial-isostatic uplift at Lake Skallen and Lake Oyako, Lutzow-Holm Bay, East Antarctica: Based on biogeochemical facies and molecular signatures
APPLIED GEOCHEMISTRY, Dec. 2012
27, 12, 2546, 2559
[Reviewed]

Akira Ijiri; Naomi Harada; Akinari Hirota; Urumu Tsunogai; Nanako O. Ogawa; Takuya Itaki; Boo-Keun Khim; Masao Uchida
Biogeochemical processes involving acetate in sub-seafloor sediments from the Bering Sea shelf break
ORGANIC GEOCHEMISTRY, Jul. 2012
48, 47, 55
[Reviewed]

Hironobu Sakuma; Ryuji Tada; Masayuki Ikeda; Yuichiro Kashiyama; Naohiko Ohkouchi; Nanako O. Ogawa; Satoko Watanabe; Eiichi Tajika; Shinji Yamamoto
High-resolution lithostratigraphy and organic carbon isotope stratigraphy of the Lower Triassic pelagic sequence in central Japan
ISLAND ARC, Jun. 2012
21, 2, 79, 100
[Reviewed]

OHKOUCHI Naohiko; CHIKARAISHI Yoshito; OGAWA Nanako O
Diet Analysis Based on Nitrogen Isotopic Composition of Amino Acids
KAGAKU TO SEIBUTSU, 01 Jun. 2012
50, 6, 430, 434

Ogawa Nanako; Chikaraishi Yoshito; Wada Eitaro; Ohkouchi Naohiko
Ecosystem study of Lake Baikal from nitrogen isotopic analysis of amino acids
Abstracts of Annual Meeting of the Geochemical Society of Japan, 2012
59, 186

Ichiro Tayasu; Riyo Hirasawa; Nanako O. Ogawa; Naohiko Ohkouchi; Keita Yamada
New organic reference materials for carbon- and nitrogen-stable isotope ratio measurements provided by Center for Ecological Research, Kyoto University, and Institute of Biogeosciences, Japan Agency for Marine-Earth Science and Technology
LIMNOLOGY, Dec. 2011
12, 3, 261, 266
[Reviewed]

Atsuko Yamazaki; Tsuyoshi Watanabe; Nanako O. Ogawa; Naohiko Ohkouchi; Kotaro Shirai; Mitsuhiro Toratani; Mitsuo Uematsu
Seasonal variations in the nitrogen isotope composition of Okinotori coral in the tropical western Pacific: A new proxy for marine nitrate dynamics
Journal of Geophysical Research: Biogeosciences, 01 Dec. 2011
116, 4
[Reviewed]

Maki Noguchi Aita; Kazuaki Tadokoro; Nanako O. Ogawa; Fujio Hyodo; Reiichiro Ishii; S. Lan Smith; Toshiro Saino; Michio J. Kishi; Sei-Ichi Saitoh; Eitaro Wada
Linear relationship between carbon and nitrogen isotope ratios along simple food chains in marine environments
JOURNAL OF PLANKTON RESEARCH, Nov. 2011
33, 11, 1629, 1642
[Reviewed]

Yamazaki Atsuko; Watanabe Tsuyoshi; Ogawa Nanako O; Ohkouchi Naohiko; Shirai Kotaro; Toratani Mitsuhiro; Uematsu Mitsuo
Seasonal variations in the nitrogen isotope composition of Okinotori coral in the tropical western Pacific: A new proxy for marine nitrate dynamics
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES, 14 Oct. 2011
116
[Reviewed]

Yasuhito Sekine; Katsuhiko Suzuki; Ryoko Senda; Kosuke T. Goto; Eiichi Tajika; Ryuji Tada; Kazuhisa Goto; Shinji Yamamoto; Naohiko Ohkouchi; Nanako O. Ogawa; Teruyuki Maruoka
Osmium evidence for synchronicity between a rise in atmospheric oxygen and Palaeoproterozoic deglaciation
NATURE COMMUNICATIONS, Oct. 2011
2, 502
[Reviewed]

Chikaraishi Yoshito; Takano Yoshinori; Ogawa Nanako O; Sasaki Yoko; Tsuchiya Masashi; Ohkouchi Naohiko
Food chain analysis by nitrogen isotopic composition of amino acids : Application to terrestrial environments(Advances in molecular and stable isotope studies among the organic geochemical and related communities (Part II))
Researches in organic geochemistry, 30 Sep. 2011
27, 3, 11

Junichiro Kuroda; Masaharu Tanimizu; Rie S. Hori; Katsuhiko Suzuki; Nanako O. Ogawa; Maria L. G. Tejada; Millard F. Coffin; Rodolfo Coccioni; Elisabetta Erba; Naohiko Ohkouchi
Lead isotopic record of Barremian-Aptian marine sediments: Implications for large igneous provinces and the Aptian climatic crisis
EARTH AND PLANETARY SCIENCE LETTERS, Jul. 2011
307, 1-2, 126, 134
[Reviewed]

Yoshito Chikaraishi; Nanako O. Ogawa; Hideyuki Doi; Naohiko Ohkouchi
N-15/N-14 ratios of amino acids as a tool for studying terrestrial food webs: a case study of terrestrial insects (bees, wasps, and hornets)
ECOLOGICAL RESEARCH, Jul. 2011
26, 4, 835, 844
[Reviewed]

Sakae Toyoda; Midori Yano; Sei-ichi Nishimura; Hiroko Akiyama; Atsushi Hayakawa; Keisuke Koba; Shigeto Sudo; Kazuyuki Yagi; Akiko Makabe; Yoshifumi Tobari; Nanako O. Ogawa; Naohiko Ohkouchi; Keita Yamada; Naohiro Yoshida
Characterization and production and consumption processes of N2O emitted from temperate agricultural soils determined via isotopomer ratio analysis
GLOBAL BIOGEOCHEMICAL CYCLES, May 2011
25
[Reviewed]

宮地俊作; 馬谷原武之; 對馬孝治; 笹田勝寛; 河野英一; 伊藤絹子; 川端淳; 力石嘉人; 小川奈々子; 大河内直彦
マイワシとカタクチイワシの栄養段階と食源:全窒素・炭素及びアミノ酸窒素の安定同位体比を用いた食性解析
日本水産学会大会講演要旨集, 27 Mar. 2011
2011, 77

Hidetaka Nomaki; Nanako O. Ogawa; Yoshinori Takano; Hisami Suga; Naohiko Ohkouchi; Hiroshi Kitazato
Differing utilization of glucose and algal particulate organic matter by deep-sea benthic organisms of Sagami Bay, Japan
MARINE ECOLOGY PROGRESS SERIES, 2011
431, 11, +
[Reviewed]

Annekatrin J. Enge; Hidetaka Nomaki; Nanako O. Ogawa; Ursula Witte; Markus M. Moeseneder; Gaute Lavik; Naohiko Ohkouchi; Hiroshi Kitazato; Michal Kucera; Petra Heinz
Response of the benthic foraminiferal community to a simulated short-term phytodetritus pulse in the abyssal North Pacific
MARINE ECOLOGY PROGRESS SERIES, 2011
438, 129, 142
[Reviewed]

Ogawa Nanako O.; Chikaraishi Yoshito; Wada Eitaro; Ohkouchi Naohiko
Compound-specific nitrogen isotope compositions of amino acid as a tool for food-web analysis
Abstracts of Annual Meeting of the Geochemical Society of Japan, 2011
58, 91, 91

Ijiri Akira; Harada Naomi; Ogawa Nanako O; Sakamoto Tatsuhiko; Nakatsuka Takeshi
Carbon isotope biogeochemistry of acetate in sub-seafloor sediments in the Sea of Okhotsk near Sakhalin Island, Russia(Advances in molecular and stable isotope studies among the organic geochemical and related communities (Part I))
Researches in organic geochemistry, 24 Dec. 2010
26, 95, 105

Yoshinori Takano; Yoshito Chikaraishi; Nanako O. Ogawa; Hidetaka Nomaki; Yuki Morono; Fumio Inagaki; Hiroshi Kitazato; Kai-Uwe Hinrichs; Naohiko Ohkouchi
Sedimentary membrane lipids recycled by deep-sea benthic archaea
NATURE GEOSCIENCE, Dec. 2010
3, 12, 858, 861
[Reviewed]

Tyler, J; Kashiyama, Y; Ohkouchi, N; Ogawa, N; Yokoyama, Y; Chikaraishi, Y; Staff, RA; Ikehara, M; Ramsey, CB; Bryant, C; Brock, F; Gotanda, K; Haraguchi, T; Yonenobu, H; Nakagawa, T
Tracking aquatic change using chlorin-specific carbon and nitrogen isotopes: The last glacial-interglacial transition at Lake Suigetsu, Japan
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS, 23 Sep. 2010
11, 9
[Reviewed]

Yasuhito Sekine; Eiichi Tajika; Naohiko Ohkouchi; Nanako O. Ogawa; Kazuhisa Goto; Ryuji Tada; Shinji Yamamoto; Joseph L. Kirschvink
Anomalous negative excursion of carbon isotope in organic carbon after the last Paleoproterozoic glaciation in North America
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS, Aug. 2010
11
[Reviewed]

Kosei E. Yamaguchi; Kazumasa Oguri; Nanako O. Ogawa; Saburo Sakai; Satoshi Hirano; Hiroshi Kitazato; Naohiko Ohkouchi
Geochemistry of modern carbonaceous sediments overlain by a water mass showing photic zone anoxia in the saline meromictic Lake Kai-ike, southwest Japan: I. Early diagenesis of organic carbon, nitrogen, and phosphorus
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY, Aug. 2010
294, 1-2, 72, 82
[Reviewed]

Yoshinori Takano; Yuichiro Kashiyama; Nanako O. Ogawa; Yoshito Chikaraishi; Naohiko Ohkouchi
Isolation and desalting with cation-exchange chromatography for compound-specific nitrogen isotope analysis of amino acids: application to biogeochemical samples
RAPID COMMUNICATIONS IN MASS SPECTROMETRY, Aug. 2010
24, 16, 2317, 2323
[Reviewed]

Nanako O OGAWA
Ultra-sensitive elemental analyzer/isotope ratio mass spectrometer for stable nitrogen and carbon isotope analyses　　　　　　　　　　　　　　　
Earth, Life, and Isotopes, Aug. 2010

Nanako O OGAWA
The role of meiofauna in deep-sea benthic food webs revealed by carbon and nitrogen stable isotope analyses　　　　　　　　　　　　　　　
Earth, Life, and Isotopes, Aug. 2010

Nanako O OGAWA
Fish scales as a record of atmospheric change　　　　　　　　　　　　　　　
Earth, Life, and Isotopes, Aug. 2010

Nanako O OGAWA
Instrumental optimization of compound-specific nitrogen isotope analysis of amino acids by gas chromatography/combustion/isotope ratio mass spectrometry　　　　　　　　　　　　　　　
Earth, Life, and Isotopes, Aug. 2010

Nanako O OGAWA
Further evaluation of trophic level estimation based on nitrogen isotopic composition of amino acids　　　　　　　　　　　　　　　
Earth, Life, and Isotopes, Aug. 2010

S. Kusch; Y. Kashiyama; N. O. Ogawa; M. Altabet; M. Butzin; J. Friedrich; N. Ohkouchi; G. Mollenhauer
Implications for chloro- and pheopigment synthesis and preservation from combined compound-specific delta C-13, delta N-15, and Delta C-14 analysis
BIOGEOSCIENCES, 2010
7, 12, 4105, 4118
[Reviewed]

Takano, Y; Yokoyama, Y; Tyler, J.J; Fukui, M; Sato, T; Ogawa, N.O; Suzuki, N; Kitazato, H; Ohkouchi, N
Crustal uplifting rate associated with late-Holocene glacial-isostatic rebound at Skallen and Skarvsnes, Lutzow-Holm Bay, East Antarctica: evidence of a synchrony in sedimentary and biological facies on geological setting.
Biogeosciences Discuss, 2010
7, 4341, 4384

Yoshito Chikaraishi; Nanako O. Ogawa; Yuichiro Kashiyama; Yoshinori Takano; Hisami Suga; Akiko Tomitani; Hideaki Miyashita; Hiroshi Kitazato; Naohiko Ohkouchi
Determination of aquatic food-web structure based on compound-specific nitrogen isotopic composition of amino acids
LIMNOLOGY AND OCEANOGRAPHY-METHODS, Nov. 2009
7, 740, 750
[Reviewed]

Hidetaka Nomaki; Naohiko Ohkouchi; Petra Heinz; Hisami Suga; Yoshito Chikaraishi; Nanako O. Ogawa; Kouhei Matsumoto; Hiroshi Kitazato
Degradation of algal lipids by deep-sea benthic foraminifera: An in situ tracer experiment
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS, Sep. 2009
56, 9, 1488, 1503
[Reviewed]

K. C. Ruttenberg; N. O. Ogawa; F. Tamburini; R. A. Briggs; N. D. Colasacco; E. Joyce
Improved, high-throughput approach for phosphorus speciation in natural sediments via the SEDEX sequential extraction method
LIMNOLOGY AND OCEANOGRAPHY-METHODS, May 2009
7, 5, 319, 333
[Reviewed]

Yoshinori Takano; Yoshito Chikaraishi; Nanako O. Ogawa; Hiroshi Kitazato; Naohiko Ohkouchi
Compound-Specific Nitrogen Isotope Analysis of D-Alanine, L-Alanine, and Valine: Application of Diastereomer Separation to delta N-15 and Microbial Peptidoglycan Studies
ANALYTICAL CHEMISTRY, Jan. 2009
81, 1, 394, 399
[Reviewed]

Junko Nishikawa; Ayato Kohzu; Narin Boontanon; Tomoya Iwata; Takuya Tanaka; Nanako O. Ogawa; Reiichiro Ishii; Eitaro Wada
Isotopic composition of nitrogenous compounds with emphasis on anthropogenic loading in river ecosystems
ISOTOPES IN ENVIRONMENTAL AND HEALTH STUDIES, 2009
45, 1, 27, 40
[Reviewed]

柏山 祐一郎; 小川 奈々子; 大河内 直彦
ヘムおよびヘム起源化石ポルフィリンの窒素・炭素同位体的な特徴
日本地球化学会年会要旨集, 2009
56, 16, 16

柏山 祐一郎; 力石 嘉人; 小川 奈々子; 大河内 直彦
テトラピロール化合物の炭素アイソトポマーと基礎生産者の炭酸同化プロセス
日本地球化学会年会要旨集, 2009
56, 152, 152

Sakuma Hironobu; Tada Ryuji; Ikeda Masayuki; Kashiyama Yuichiro; Ohkouchi Naohiko; O. Ogawa Nanako; Watanabe Satoko; Tajika Eiichi; Yamamoto Shinji
Paleoredox changes in deep-sea environment based on the Permian/Triassic boundary lithostratigraphy on the Jurassic accretionary complex in Japan
Annual Meeting of the Geological Society of Japan, 2009
2009, 0, 90, 90

Y. Kashiyama; H. Miyashita; S. Ohkubo; N.O. Ogawa; Y. Chikaraishi; Y. Takano; H. Suga; T. Toyofuku; H. Nomaki; H. Kitazato; T. Nagata; N. Ohkouchi
Evidence of global chlorophyll d
Science, 01 Aug. 2008
321, 5889, 658, 658
[Reviewed]

Yaeko Suzuki; Yoshito Chikaraishi; Nanako O. Ogawa; Naohiko Ohkouchi; Takashi Korenaga
Geographical origin of polished rice based on multiple element and stable isotope analyses
FOOD CHEMISTRY, Jul. 2008
109, 2, 470, 475
[Reviewed]

Yoshito Chikaraishi; Yuichiro Kashiyama; Nanako O. Ogawa; Hiroshi Kitazato; Mitsuru Satoh; Shinya Nomoto; Naohiko Ohkouchi
A compound-specific isotope method for measuring the stable nitrogen isotopic composition of tetrapyrroles
ORGANIC GEOCHEMISTRY, 2008
39, 5, 510, 520
[Reviewed]

Yuichiro Kashiyama; Nanako O. Ogawa; Junichiro Kuroda; Motoo Shiro; Shinya Nomoto; Ryuji Tada; Hiroshi Kitazato; Naohiko Ohkouchi
Diazotrophic cyanobacteria as the major photoautotrophs during mid-Cretaceous oceanic anoxic events: Nitrogen and carbon isotopic evidence from sedimentary porphyrin
ORGANIC GEOCHEMISTRY, 2008
39, 5, 532, 549
[Reviewed]

Hidetaka Nomaki; Nanako O. Ogawa; Naohiko Ohkouchi; Hisami Suga; Takashi Toyofuku; Motohiro Shimanaga; Takeshi Nakatsuka; Hiroshi Kitazato
Benthic foraminifera as trophic links between phytodetritus and benthic metazoans: carbon and nitrogen isotopic evidence
MARINE ECOLOGY PROGRESS SERIES, 2008
357, 153, 164
[Reviewed]

Naohiko Ohkouchi; Yoji Nakajima; Nanako O. Ogawa; Yoshito Chikaraishi; Hisami Suga; Saburo Sakai; Hiroshi Kitazato
Carbon isotopic composition of the tetrapyrrole nucleus in chloropigments from a saline meromictic lake: A mechanistic view for interpreting the isotopic signature of alkyl porphyrins in geological samples
ORGANIC GEOCHEMISTRY, 2008
39, 5, 521, 531
[Reviewed]

Takano Yoshinori; Nomaki Hidetaka; Ogawa Nanako; Chikaraishi Yoshito; Inagaki Fumio; Kitazato Hiroshi; Ohkouchi Naohiko
In-situ tracer experiments for benthic Archaea: carbon isotopic evidence of metabolic activity from archaeal membrane lipids
Abstracts of Annual Meeting of the Geochemical Society of Japan, 2008
55, 154, 154

Ogawa Nanako O.; Chikaraishi Yoshito; Kashiyama Yuichiro; Tomitani Akiko; Kitazato Hiroshi; Ohkouchi Naohiko
Stable isotope abundances in cyanobacterial phycobiliproteins
Abstracts of Annual Meeting of the Geochemical Society of Japan, 2008
55, 184, 184

Ijiri Akira; Harada Naomi; Ogawa Nanako; Ohkouchi Naohiko; Sakamoto Tatsuhiko; Nakatsuka takeshi
Carbon isotope biogeochemistry of acetate from marine sediment
Abstracts of Annual Meeting of the Geochemical Society of Japan, 2008
55, 156, 156

Takano Yoshinori; Chikaraishi Yoshito; Ogawa Nanako; Kitazato Hiroshi; Ohkouchi Naohiko
Compound-specific nitrogen isotope composition for stereoisomers: D- and L-alanine in peptidoglycan from prokaryote
Abstracts of Annual Meeting of the Geochemical Society of Japan, 2008
55, 189, 189

Chikaraishi Yoshito; Nanako O. Ogawa; Yuichiro Kashiyama; Yoshinori Takano; Hiroshi Kitazato; Naohiko Ohkouchi
Nitrogen isotope analysis of amino acids as a tool for elucidating food web
Abstracts of Annual Meeting of the Geochemical Society of Japan, 2008
55, 187, 187

Kashiyama Yuichiro
Multidimensional analyses of the photosynthetic primary production based on stable isotopic compositions of individual chloropigments and their derivatives
Abstracts of Annual Meeting of the Geochemical Society of Japan, 2008
55, 186, 186

Yamazaki Atsuko; Watanabe Tsuyoshi; Kawashima Tatsunori; Ogawa Nanako; Ohkouchi Naohiko; Shirai Kotaro; Sano Yuji; Uematsu Mitsuo
Seasonal variation of nitrogen isotopes in coral skeletons:New proxy for nutrients activity of surface oceans in low latitude
Abstracts of Annual Meeting of the Geochemical Society of Japan, 2008
55, 406, 406

関根 康人; 鈴木 勝彦; 仙田 量子; 田近 英一; 多田 隆治; 後藤 和久; 山本 信治; 大河内 直彦; 小川 奈々子
カナダ・原生代初期ヒューロニアン累層群における氷河性堆積物層のオスミウム同位体変動：酸素増大イベントと気候変動の因果関係に与える示唆
日本地球化学会年会要旨集, 2008
55, 389, 389

Naito Yuichi
Dietary reconstruction of Jomon human remains in Hokkaido utilizing nitrogen isotopic analysis of amino acids
Abstracts of Annual Meeting of the Geochemical Society of Japan, 2008
55, 0, 188, 188
[Reviewed]

KASHIYAMA Y.
Reconstruction of the biogeochemistry and ecology of photoautotrophs based on the nitrogen and carbon isotopic compositions of vanadyl porphyrins from Miocene siliceous sediments
Biogeosci., 2008
5, 797, 816

Junichiro Kuroda; Nanako O. Ogawa; Masaharu Tanimizu; Millard F. Coffin; Hidekazu Tokuyama; Hiroshi Kitazato; Naohiko Ohkouchi
Contemporaneous massive subaerial volcanism and late cretaceous Oceanic Anoxic Event 2
EARTH AND PLANETARY SCIENCE LETTERS, Apr. 2007
256, 1-2, 211, 223
[Reviewed]

Yoshito Chikaraishi; Yuichiro Kashiyamal; Nanako O. Ogawa; Hiroshi Kitazato; Naohiko Ohkouchi
Metabolic control of nitrogen isotope composition of amino acids in macroalgae and gastropods: implications for aquatic food web studies
MARINE ECOLOGY PROGRESS SERIES, 2007
342, 85, 90
[Reviewed]

Yusuke Yokoyama; Tatsuhiro Naruse; Nanako O. Ogawa; Ryuji Tada; Hiroshi Kitazato; Naohiko Ohkouchi
Dust influx reconstruction during the last 26,000 years inferred from a sedimentary leaf wax record from the Japan Sea
GLOBAL AND PLANETARY CHANGE, Dec. 2006
54, 3-4, 239, 250
[Reviewed]

Hidetaka Nomaki; Petra Heinz; Takeshi Nakatsuka; Motohiro Shimanaga; Naohiko Ohkouchi; Nanako O. Ogawa; Kazuhiro Kogure; Eiko Ikemoto; Hiroshi Kitazato
Different ingestion patterns of C-13-labeled bacteria and algae by deep-sea benthic foraminifera
MARINE ECOLOGY PROGRESS SERIES, 2006
310, 95, 108
[Reviewed]

Ogawa Nanako, O.; Chikaraishi Yoshito; Wada Eitaro; Kitazato Hiroshi; Ohkouchi Naohiko
Compound-specific nitrogen isotopic composition of amino acids from Omul fish in Lake Baikal: A new approach for studying biological nitrogen cycle in the lake
Abstracts of Annual Meeting of the Geochemical Society of Japan, 2006
53, 232, 232

Ohkouchi N; Kashiyama Y; Kuroda J; Ogawa N. O; Kitazato H
The importance of diazotrophic cyanobacteria as primary producers during Cretaceous Oceanic Anoxic Event 2
Biogeosciences, 2006
3, 4, 467, 478
[Reviewed]

N Ohkouchi; Y Nakajima; H Okada; NO Ogawa; H Suga; K Oguri; H Kitazato
Biogeochemical processes in the saline meromictic Lake Kaiike, Japan: implications from molecular isotopic evidences of photosynthetic pigments
ENVIRONMENTAL MICROBIOLOGY, Jul. 2005
7, 7, 1009, 1016
[Reviewed]

Y Chikaraishi; K Matsumoto; NO Ogawa; H Suga; H Kitazato; N Ohkouchi
Hydrogen, carbon and nitrogen isotopic fractionations during chlorophyll biosynthesis in C3 higher plants
PHYTOCHEMISTRY, Apr. 2005
66, 8, 911, 920
[Reviewed]

Y Nakajima; H Shimizu; NO Ogawa; T Sakamoto; H Okada; K Koba; H Kitazato; N Ohkouchi
Vertical distributions of stable isotopic compositions and bacteriochlorophyll homologues in suspended particulate matter in saline meromictic Lake Abashiri
LIMNOLOGY, Dec. 2004
5, 3, 185, 189
[Reviewed]

NO Ogawa; T Koitabashi; H Oda; T Nakamura; N Ohkouchi; E Wada
Fluctuations of nitrogen isotope ratio of gobiid fish (Isaza) specimens and sediments in Lake Biwa, Japan, during the 20th century
LIMNOLOGY AND OCEANOGRAPHY, Jul. 2001
46, 5, 1228, 1236
[Reviewed]

N. Ogawa; N. Ogura
Dynamics of Particulate Organic Matter in the Tamagawa Estuary and Inner Tokyo Bay
Estuarine, Coastal and Shelf Science, Mar. 1997

松本廣直; 石川晃; 大河内直彦; 小川奈々子; 白井厚太朗; 黒田潤一郎; 鈴木勝彦
Re-examination of the linkages between the Ontong Java volcanism and Cretaceous oceanic anoxic event
日本地球化学会年会要旨集(Web), 2023
70th

古知武; 黒田潤一郎; 小川奈々子; 吉村寿紘; 宮崎隆; VAGLAROV Bogdan Stefanov; 大河内直彦
Reconstruction of the Mediterranean sulfur cycle during the Messinian salinity crisis using evaporites
日本地球惑星科学連合大会予稿集(Web), 2021
2021

木庭啓介; 木下桂; 大西雄二; 福島慶太郎; 尾坂兼一; 松尾奈緒子; 舟川一穂; 瀬古祐吾; 目戸綾乃; 平澤理世; 小川奈々子; 兵藤不二夫; 由水千景
Carbon and Nitrogen Isotope Analysis on Small Samples Using a Near-conventional EA-IRMS System
RADIOISOTOPES (Web), 2021
70, 4
[Reviewed]

板橋悠; 大森貴之; 尾嵜大真; 山崎孔平; 大河内直彦; 高野淑識; 小川奈々子; 石川尚人; 米田穣
アミノ酸の微量グラファイト化による遺跡出土骨¹⁴C年代測定の高精度化
日本文化財科学会大会研究発表要旨集, 2019
36th

畑中美沙希; 横山祐典; CLARK Geoffrey; 宮島利宏; 小川奈々子; 宮入陽介; 大河内直彦
半化石骨安定同位体分析による後期完新世マダガスカルにおける絶滅大型動物の古生態・古気候復元
日本地球化学会年会要旨集(Web), 2019
66th

Hori Rie S; Yoshida Natsuko; Kuroda Junichiro; Ogawa Nanako O
A Triassic-Jurassic boundary sequence of bedded chert from the Chichibu Belt, Ehime Prefecture, Shikoku, Japan
Annual Meeting of the Geological Society of Japan, 2017
2017, 0

吉川 知里; 阿部瞳; 相田真希; 小川奈々子; 菅寿美; 大河内直彦; 脇田昌英; 本多牧生; 豊田栄; 吉田尚弘
海洋N2O排出量の推定を目的とした海洋低次生態系-同位体分子種モデルの開発　　　　　　　　　　　　　　　
月刊海洋, 2016
48, 7, 302, 308

板橋悠; 高野淑識; 力石嘉人; 小川奈々子; 大河内直彦; 山根雅子; 横山祐典; 米田穣
液体クロマトグラフィを用いた遺跡出土骨試料の単離アミノ酸の放射性炭素年代測定
日本文化財科学会大会研究発表要旨集, 2015
32nd

兒玉 賢哉; 関根 康人; 高野 淑識; 小川 奈々子; 大河内 直彦; 小林 敬道; 関根 利守
O6-06 氷衛星および小惑星における有機化合物の生成と衝撃変成に関する実験的研究(口頭発表セッション6 表層進化・物質I,口頭発表)
日本惑星科学会秋期講演会予稿集, 10 Sep. 2014
2014, "O6, 06"

陀安一郎; 長谷川尚志; 由水千景; 力石嘉人; 小川奈々子; 大河内直彦
アミノ酸窒素同位体比を用いた、陸域分解系における土壌動物の資源利用解析　　　　　　　　　　　　　　　
日本生態学会第60回大会, 2013

近藤裕介; 大塚攻; 西川淳; 小川奈々子; 大河内直彦
熱帯~温帯アジアにおける大型クラゲと共生生物の種間関係(2):安定同位体比を用いた種間関係の解明
日本ベントス学会・日本プランクトン学会合同大会講演要旨集, 2012
2012

大塚攻; 近藤裕介; 西川淳; 小川奈々子; 大河内直彦
熱帯~温帯アジアにおける大型クラゲと共生生物の種間関係(1):共生生物群集
日本ベントス学会・日本プランクトン学会合同大会講演要旨集, 2012
2012

Yamaguchi Yasuhiko; Takano Yoshinori; Chikaraishi Yoshito; Suga Hisami; Ogawa Nanako; Yokoyama Yusuke; Ohkouchi Naohiko
Nitrogen isotopic composition and D/L ratio of amino acids in deep-subsurface marine sediments
Abstracts of Annual Meeting of the Geochemical Society of Japan, 2012
59, 0

長谷川尚志; 力石嘉人; 小川奈々子; 大河内直彦; 陀安一郎
アミノ酸窒素同位体比による陸域腐食食物網解析の試み　　　　　　　　　　　　　　　
2012

Makabe, A; Koba, K; Yoshimizu, C; Tayasu, I; Ogawa, N. O; Ohkouchi, N; Toyoda, S; Yoshida, N; Nagata, T
Fate of atmospheric nitrate and nitrogen biogeochemical processes in lake Biwa elucidated by multiple oxygen isotopes　　　　　　　　　　　　　　　
ASLO Summer Meeting, 2012

三宅裕志; 寺沢真琴; 小川奈々子; 大河内直彦
東日本大震災で被災中にサツマハオリムシ水槽に起こった出来事
ブルーアース要旨集, 2012
2012, 113

大河内 直彦; 小川 奈々子; 力石 嘉人
科学通信 分子で地球を読む(No.2)琵琶湖の富栄養化と生態系の変化
科学, Jul. 2011
81, 7, 621, 623

Yamaguchi Yasuhiko; Takano Yoshinori; Chikaraishi Yoshito; Ogawa Nanako; Imachi Hiroyuki; Suga Hisami; Yokoyama Yusuke; Ohkouchi Naohiko
Nitrogen isotopic signatures of amino acids in microbes: culture experiments and applications to marine sediments
Abstracts of Annual Meeting of the Geochemical Society of Japan, 2011
58, 0, 92, 92

長谷川尚志; 力石嘉人; 小川奈々子; 大河内直彦; 陀安一郎
陸域腐食食物網へのアミノ酸窒素同位体比の適用　　　　　　　　　　　　　　　
日本生態学会第58回大会, 2011

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: Relationship between biodiversity and ecosystem function, 2011

CHIKARAISHI Yoshito; OGAWA Nanako O; TAKANO Yoshinori; TSUCHIYA Masashi; OHKOUCHI Naohiko
Food chain analysis by nitrogen isotopic composition of amino acids(Geochemistry of organic matter, microbes, and ecosystem)
Chikyukagaku, 25 Dec. 2010
44, 4, 233, 241

Y. Kashiyama; N.O. Ogawa; S. Nomoto; H. Kitazato; N. Ohkouchi
Nitrogen and carbon isotopic compositions of copper nickel and vanadyl porphyrins in Cretaceous black shales　　　　　　　　　　　　　　　
In: N. Ohkouchi I. Tayasu K. Koba (eds.) Earth Life and Isotopes Kyoto University Press Kyoto, Aug. 2010
313, 335

N. Ohkouchi; Y. Chikaraishi; Y. Kashiyama; N.O. Ogawa
Isotopomers of chlorophyll nuclei: Theory and application
In: N.Ohkouchi I. Tayasu K. Koba (eds.) Earth Life and Isotopes Kyoto University Press Kyoto, Aug. 2010
271, 290

Y. Kashiyama; N.O. Ogawa; Y. Chikaraishi; N. Kashiyama; S. Sakai; K. Tanabe; N. Ohkouc
Reconstructing the life history of modern and fossil nautiloids based on the nitrogen isotopic composition of shell organic matter and amino acids　　　　　　　　　　　　　　　
In: K. Tanabe Y. Shigeta T. Sasaki H. Hirano (eds.) Cephalopod-Present and Past, May 2010
67, 75

石井励一郎; 相田真希; 小川奈々子; 高津文人; 山田佳裕; 兵藤不二夫; 和田英太郎
食物連鎖に沿ったCN安定同位体分別係数はどのように決まっているか:アミノ酸代謝モデルからの考察
日本生態学会大会講演要旨集, 2010
57th

Yamaguchi Yasuhiko; Takano Yoshinori; Chikaraishi Yoshito; Ogawa Nanako; Imachi Hiroyuki; Suga Hisami; Yokoyama Yusuke; Ohkouchi Naohiko
Nitrogen isotopic signature of amino acids in microbes: a novel tool in biogeochemistry
Abstracts of Annual Meeting of the Geochemical Society of Japan, 2010
57, 0, 115, 115

SUGA Hisami; OGAWA Nanako; KASHIYAMA Yuichiro; OHKOUCHI Naohiko
Reconstruction of the environment on TL1, 2 and 3 in Japan Sea using nitrogen isotopic compositions in pheopigments
Abstracts of Annual Meeting of the Geochemical Society of Japan, 2010
57, 0, 84, 84

Tsuchiya Masashi; Fujiwara Yoshihiro; Nomaki Hidetaka; Toyofuku Takashi; Yamamoto Hiroyuki; Maruyama Tadashi; Wada Eitaro; Chikaraishi Yoshito; Ohkouchi Naohiko; Takano Yoshinori; Ogawa Nanako; Fujikura Katsunori; Yoshida Takao; Kitamura Minoru; Lindsay Dhugal
Food web analyses of the marine ecosystems based on nitrogen isotope of amino acids
Abstracts of Annual Meeting of the Geochemical Society of Japan, 2010
57, 0, 41, 41

長谷川尚志; 力石嘉人; 小川奈々子; 大河内直彦; 陀安一郎
食性指標としてのアミノ酸窒素安定同位体比の利用：土壌食物網研究への適用にむけて　　　　　　　　　　　　　　　
日本生態学会第57回大会, 2010

高取 惇哉; 大河内 直彦; 小川 奈々子; 田中 樹; 近藤 洋一; 幡野 恭子; 坂本 皆子; 大久保 智司; 宮下 英明
1A-14 「天狗の麦飯」微生物群集構造の深度別比較(口頭発表)
日本微生物生態学会講演要旨集, 21 Nov. 2009
25, 7, 7

O OGAWA Nanako; CHIKARAISHI Yoshito; OHKOUCHI Naohiko
Diet analysis based on the nitrogen isotopic composition of amino acids
臨床化学, 31 Jul. 2009
38, 3, 266, 271

J. Kuroda; M. Tanimizu; R. S. Hori; K. Suzuki; N. O. Ogawa; M. L. G. Tejada; M. F. Coffin; R. Coccioni; N. Ohkouchi
Multiple eruptions of the Ontong Java Plateau as a trigger of the Cretaceous Oceanic Anoxic Event-1a
GEOCHIMICA ET COSMOCHIMICA ACTA, Jun. 2009
73, 13, A708, A708

Y. Sekine; K. Suzuki; R. Senda; E. Tajika; R. Tada; K. Goto; S. Yamamoto; N. Ohkouchi; N. O. Ogawa
Osmium evidence for relationship between atmospheric oxygenation and Paleoproterozoic glaciation
GEOCHIMICA ET COSMOCHIMICA ACTA, Jun. 2009
73, 13, A1193, A1193

Kuroda Junichiro; Suzuki Katsuhiko; Tanimizu Masaharu; Hori Rie; Tejada Maria Luisa L; Kashiyama Yuichiro; Ogawa Nanako; Ohkouchi Naohiko
Paleoenvironmental change during the mid-Cretaceous time
Abstracts of Annual Meeting of the Geochemical Society of Japan, 2009
56, 0, 304, 304

Y. Takano; F. Inagaki; Y. Morono; N. O. Ogawa; H. Kitazato; N. Ohkouchi
Application of NMR to characterize Intact Polar Lipids in deep biosphere
GEOCHIMICA ET COSMOCHIMICA ACTA, Jul. 2008
72, 12, A927, A927

黒田 潤一郎; 谷水 雅治; 堀 利栄; 鈴木 勝彦; 小川 奈々子; 大河内 直彦
オントンジャワ海台火山活動と白亜紀の海洋環境変動
日本地球化学会年会要旨集, 2008
55, 0, 398, 398

大河内 直彦; 力石 嘉人; 小川 奈々子; 柏山 祐一郎; 菅 寿美; 北里 洋
クロロフィルのアイソトポマー：理論と実践
日本地球化学会年会要旨集, 2008
55, 0, 185, 185

Suga Hisami; Yokoyama Yusuke; Ogawa Nanako; Kitazato Hiroshi; Ohkouchi Naohiko
Reconstruction of paleohydrology in Japan Sea based on isotopic records in a sediment core recovered from off Akita
Abstracts of Annual Meeting of the Geochemical Society of Japan, 2008
55, 0, 418, 418

A. Makabe; K. Koba; I. Tayasu; A, Kohzu; M. Itoh; C. Yoshimizu; N.O. Ogawa; N. Ohkouchi; S. Toyoda; N. Yoshida; T. Nagata
Dynamics of Nitrous Oxide in the Sewage-polluted River in Mongolia　　　　　　　　　　　　　　　
Asia Oceania Geosciences Society's 5th Annual Meeting, 2008

眞壁明子; 木庭啓介; 由水千景; 小川奈々子; 陀安一郎; KIM Chulgoo; 大河内直彦; 豊田栄; 吉田尚弘; 永田俊
安定同位体からみた琵琶湖における一酸化二窒素の生成機構
日本陸水学会大会講演要旨集, 10 Sep. 2007
72nd, 254

Kuroda J; Tanimizu M; Suzuki K; Tejada Marissa L. G; Ogawa N; Coffin Millard F; Kashiyama Y; Ohkouchi N
O-2 Contemporaneous massive volcanism and Aptian Oceanic Anoxlc Event-1a based on C, Pb and Os isotopic records
日本地質学会学術大会講演要旨, 01 Sep. 2007
114, 62, 62

CHIKARAISHI Yoshito; KASHIYAMA Yuichiro; OGAWA Nanako O; OHKOUCHI Naohiko
Stable Isotopes as Ecological Proxies : Compound-Specific Nitrogen Isotope Analysis of Amino Acids
Radioisotopes, 15 Aug. 2007
56, 8, 463, 477

Y. Chikaraishi; Y. Kashiyama; N. O. Ogawa; H. Kitazato; N. Ohkouchi
Stable nitrogen isotopic composition of amino acids: Implications for aquatic food web studies
GEOCHIMICA ET COSMOCHIMICA ACTA, Aug. 2007
71, 15, A170, A170

Y. Kashiyama; N. O. Ogawa; Y. Chikaraishi; S. Nomoto; R. Tada; H. Kitazato; N. Ohkouchi
Reconstruction of the past biogeochemical cycles based on compound-specific N and C isotopic analyses of sedimentary porphyrins
GEOCHIMICA ET COSMOCHIMICA ACTA, Aug. 2007
71, 15, A466, A466

眞壁明子; 木庭啓介; 陀安一郎; 高津文人; 伊藤雅之; 由水千景; 小川奈々子; 大河内直彦; 豊田栄; 吉田尚弘; 永田俊
モンゴル下水流入河川における硝化・脱窒の日変化~アイソトポマー比による解析~
日本生態学会大会講演要旨集, 19 Mar. 2007
54th, 270

力石嘉人; 柏山祐一郎; 小川奈々子; 高野淑識; 菅寿美; 豊福高志; 富谷朗子; 北里洋; 大河内直彦
有機化合物の分子レベル安定窒素同位体比分析による地球環境解析―2:アミノ酸
日本地球化学会年会講演要旨集, 2007
54th, 158

眞壁明子; 木庭啓介; 由水千景; 陀安一郎; 金哲九; 小川奈々子; 大河内直彦; 豊田栄; 戸張賀史; 吉田尚弘; 永田俊
安定同位体からみた琵琶湖における一酸化二窒素生成・消滅機構
第6回SORSTジョイントシンポジウム講演要旨集 超微量物質の同定/認識の化学 平成19年, 2007
70

稲垣 史生; 諸野 祐樹; 益井 宣明; 寺田 武志; 井町 寛之; 布浦 拓郎; 小林 徹; 高見 英人; 高井 研; 小川 奈々子; 大河内 直彦; 小谷 亮介; 武内 理香; 戸丸 仁; 荻原 成騎; 吉岡 秀佳; 松本 良; 堀越 弘毅; CK06-06航海関係者および陸上研究者一同
2-25 地球深部探査船「ちきゅう」による下北沖慣熟掘削航海CK06-06速報 : 海底下生命圏を支えるエネルギー源は何か?(極限環境,口頭発表)
日本微生物生態学会講演要旨集, 2007
23, 62, 62

N. Ohkouchi; Y. Kashiyama; J. Kuroda; N.O. Ogawa; H. Kitazato
An importance of cyanobacteria as a primary producer during Cretaceous Oceanic Anoxic Event 2　　　　　　　　　　　　　　　
Biogeosciences, Oct. 2006
3, 575, 605

Kuroda J; Tanimizu M; Ogawa N; Coffin M. F; Ohkouchi H. N
O-8 Environmental changes during a Cretaceous oceanic anoxic event
Annual Meeting of the Geological Society of Japan, 08 Sep. 2006
113, 47, 47

Ohkouchi N; Kashiyama Y; Chikaraishi Y; Ogawa N. O; Kuroda J; Kitazato H
O-10 Reconstruction of surface ocean environment during the formation of black shales in the mid-Cretaceous based on sedimentary chlorophyll derivatives
Annual Meeting of the Geological Society of Japan, 08 Sep. 2006
113, 48, 48

Sakuma H; Tada R; Kashiyama Y; Ohkouchi N; Ogawa N; Tajika E; Watanabe S; Yamamoto S
O-11 Lithostratigraphy and organic carbon isotope stratigraphy in the lowest Triassic pelagic sequence along Kiso River, Inuyama
Annual Meeting of the Geological Society of Japan, 08 Sep. 2006
113, 49, 49

N. Ohkouchi; Y. Kahiyama; Y. Chikaraishi; N. O. Ogawa; R. Tada; H. Kitazato
Nitrogen isotopic composition of chlorophylls and porphyrins in geological samples as tools for reconstructing paleoenvironment
GEOCHIMICA ET COSMOCHIMICA ACTA, Aug. 2006
70, 18, A452, A452

Y. Kashiyama; N. O. Ogawa; Y. Chikaraishi; H. Suga; R. Tada; H. Kitazato; N. Ohkouchi
Nitrogen and carbon isotopic analyses on sedimentary porphyrins of organic-rich shales from Miocene and mid-Cretaceous
GEOCHIMICA ET COSMOCHIMICA ACTA, Aug. 2006
70, 18, A306, A306

Y. Chikaraishi; Y. Kashiyama; N. O. Ogawa; H. Kitazato; S. Nomoto; N. Ohkouchi
Stable nitrogen isotope analysis of chlorophylls by gas chromatography-isotope ratio mass spectrometry
GEOCHIMICA ET COSMOCHIMICA ACTA, Aug. 2006
70, 18, A100, A100

和田 英太郎; 宮坂 仁; 小川 奈々子
炭素・窒素同位体比から見た水界の藻類--北西太平洋とバイカル湖を例として (総特集 海産藻類の光合成系と生産性の再評価)
海洋, Jun. 2006
38, 6, 441, 452

鈴木彌生子; 力石嘉人; 小川奈々子; 大河内直彦; 伊永隆史
国産コシヒカリの多元素安定同位体比分析と産地特定の可能性
分析化学討論会講演要旨集, 29 Apr. 2006
67th, 45

眞壁明子; 木庭啓介; 由水千景; 陀安一郎; 金てつ九; 小川奈々子; 大河内直彦; 豊田栄; 戸張賀史; 吉田尚弘; 永田俊
安定同位体を用いた琵琶湖における亜酸化窒素生成・消費メカニズムの解析
日本生態学会大会講演要旨集, 24 Mar. 2006
53rd, 275

N. Ohkouchi; Y. Nakajima; N.O. Ogawa; H. Suga; Y. Kashiyama; K. Matsumoto; Y. Chikaraishi; K. Oguri; H. Kitazato
Stable carbon and nitrogen compositions of photosynthetic pigments as tracers for elemental cycle in the modern- and paleo-environments　　　　　　　　　　　　　　　
Frontier Research on Earth Evolution, 2006
2, 1, 4

Kashiyama Yuichiro; Ogawa Nanako O; Chikaraishi Yoshito; Suga Hisami; Nomoto Shinya; Tada Ryuji; Kitazato Hiroshi; Ohkouchi Naohiko
Nitrogen and carbon isotopic analyses on sedimentary porphyrins as a proxy for the paleo-photoautotrophs
Abstracts of Annual Meeting of the Geochemical Society of Japan, 2006
53, 0, 20, 20

Chikaraishi Yoshito; Kashiyama Yuichiro; Tada Yohei; Toyohuku Takashi; Ogawa Nanako; Kitazato Hiroshi; Ohkouchi Naohiko
Compound-specific stable nitrogen isotope analysis of amino aicds by GC/C/IRMS: elucidation for biological isotopic fractionation of amino acid nitrogen and its application for ecological studies
Abstracts of Annual Meeting of the Geochemical Society of Japan, 2006
53, 0, 231, 231

真壁明子; 木庭啓介; 由水千景; 陀安一郎; 金てつ九; 小川奈々子; 大河内直彦; 豊田栄; 戸張賀史; 吉田尚弘; 永田俊
安定同位体比による琵琶湖窒素循環の解釈
日本陸水学会大会講演要旨集, 10 Sep. 2005
70th, 196

Kuroda J; Ogawa N; Tanimizu M; Coffin M. F; Kitazato H; Ohkouchi N
Messive volcanism as a causal mechanism for a Cretaceous oceanic anoxic event
Annual Meeting of the Geological Society of Japan, 10 Sep. 2005
112, 56, 56

真壁明子; 木庭啓介; 由水千景; 高津文人; 小川奈々子; 大河内直彦; 金哲九; 小林由紀; 吉田尚弘
安定同位体比を用いた都市河川における窒素化合物の挙動解明
日本生態学会大会講演要旨集, 27 Mar. 2005
52nd, 188

Goto K; Tachibana S; Ohkouchi N; Tajika E; Tada R; Yamamoto S; Hirai T; Ogawa N; Isozaki Y; Kirschvink J. L
P-63 Carbon Isotope study of the Espanola Formation, Huronian Supergroup, Ontario, Canada
Annual Meeting of the Geological Society of Japan, 10 Sep. 2004
111, 191, 191

Kuroda J; Ogawa N; Tokuyama H; Suga H; Matsumoto K; Taira A; Ohkouchi N
O-100 Lamina-scale variations in carbon isotopic compositions of organic matter during Oceanic Anoxic Event-2(OAE-2)
Annual Meeting of the Geological Society of Japan, 10 Sep. 2004
111, 75, 75

K Matsumoto; H Suga; NO Ogawa; H Kitazato; N Ohkouchi
Biogeochemical implication of carbon isotopic compositions of sedimentary biomarkers from a meromictic lake
GEOCHIMICA ET COSMOCHIMICA ACTA, Sep. 2003
67, 18, A279, A279

J Kuroda; H Tokuyama; NO Ogawa; K Matsumoto; H Suga; N Ohkouchi
High-resolution isotopic record of total organic carbon in Cretaceous black shales
GEOCHIMICA ET COSMOCHIMICA ACTA, Sep. 2003
67, 18, A241, A241

和田 英太郎; 小川 奈々子; 宮坂 仁
バイカル湖:安定同位体比から見た自然の実験室 (特集 古代湖)
地球環境, 2002
7, 1, 77, 85

OGAWA Nanako; KOBA Keisuke; KOHZU Ayato; WADA Eitaro
Abundances of ^<13>C and ^<15>N in Natural Ecosystems
Radioisotopes, Sep. 1997
46, 9, 632, 644