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2025
  • Isaji, Y., Sugie, K., Ishikawa, N.F., Ogawa, N.O., Matsumoto, K., Yoshikawa, C., Obata, H., Honda, M.C., and Ohkouchi, N. (2025) 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, 12: 14. doi:10.1186/s40645-025-00689-4. [Open Access]
  • Nomaki, H., Chikaraishi, Y., Ogawa, N.O., Maki, K., Shimanaga, M., Suga, H., Tsuchiya, M., Nagata, T., and Ohkouchi, N. (2025) 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, 12: 6. doi:10.1186/s40645-025-00682-x. [Open Access]

2024
  • Furusho, A., Ishii, C., Akita, T., Oyaide, M., Mita, M., Naraoka, H., Takano, Y., Dworkin, J.P., Oba, Y., Koga, T., Fukushima, K., Aoki, D., Hashiguchi, M., Mita, H., Chikaraishi, Y., Ohkouchi, N., Ogawa, N.O., Sakai, S., Glavin, D.P., Elsila, J.E., Parker, E.T., Aponte, J.C., McLain, H.L., Orthous-Daunay, F.-R., Vuitton, V., Thissen, R., Wolters, C., Schmitt-Kopplin, P., Ruf, A., Isa, J., Hertkorn, N., Eiler, J.M., Yoshimura, T., Sugahara, H., Graham, H.V., Furukawa, Y., Araoka, D., Tanaka, S., Yoshikawa, T., Kabashima, F., Sasaki, K., Sato, H., Yamazaki, T., Onose, M., Morita, M., Kimura, Y., Kano, K., Aoki, J., Fujishima, K., Nomura, S.-i., 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., and Hamase, K. (2024) Enantioselective three-dimensional high-performance liquid chromatographic determination of amino acids in the Hayabusa2 returned samples from the asteroid Ryugu. Journal of Chromatography Open, 5, 100134. doi:10.1016/j.jcoa.2024.100134. [Open Access]
  • Kochi, T., Yoshimura, T., Ogawa, N.O., Ohkouchi, N., Kobayashi, Y., and Kuroda, J. (2024) Carbonate Associated Sulfate Extraction Method Using Weakly Acidic Cation Exchange Resins. Geostandards and Geoanalytical Research, 48(1), 77-89. doi:10.1111/ggr.12536. [Abstract]
  • Methou, P., Ogawa, N.O., Nomaki, H., Ohkouchi, N., Chen, C., and Schnabel, K. (2024) Genetic connectivity and isotopic niches of alvinocaridid shrimps from chemosynthetic habitats in Aotearoa/New Zealand, with a new Alvinocaris species. Marine Ecology Progress Series, 739, 85-109. doi:10.3354/meps14611. [Abstract]
  • Nakabayashi, M., Tsutaya, T., Ahmad, A.H., Sasaki, Y., Ogawa, N.O., Ishikawa, N.F., and Ohkouchi, N. (2024) Dietary partitioning in sympatric Paradoxurinae civets in Borneo suggested by compound-specific nitrogen isotope analysis of amino acids. Progress in Earth and Planetary Science, 11: 53. doi:10.1186/s40645-024-00655-6. [Open Access]
  • Nitzsche, K.N., Ishikawa, N.F., Yoshimura, T., Kajita, H., Kawahata, H., Ogawa, N.O., Suga, H., and Ohkouchi, N. (2024) Historical trend of polycyclic aromatic hydrocarbons in a sediment core from Osaka Bay during the Meghalayan. The Holocene, 34(7), 860-869. doi:10.1177/09596836241236320. [Abstract]
  • Nitzsche, K.N., Yoshimura, T., Ishikawa, N.F., Kawahata, H., Ogawa, N.O., Suzuki, K., Araoka, D., and Ohkouchi, N. (2024) Zinc isotope fractionation during the sorption of Zn to minerals and organic matter in sediment cores affected by anthropogenic pollution. Applied Geochemistry, 169, 106047. doi:10.1016/j.apgeochem.2024.106047. [Open Access]
  • Nomaki,H., Chen, C., Ogawa, N.O., Miyairi, Y., Ohkouchi, N., Makabe, A., Kawagucci, S., Yokoyama, Y., and Shimanaga, M. (2024) Elucidating carbon sources of hydrothermal vent animals using natural 14C abundances and habitat water temperature. Limnology and Oceanography, 69(5), 1270-1284. doi:10.1002/lno.12570. [Open Access]
  • Ochando, J., Jiménez-Espejo, F.J., Giles-Guzmán, F., Neto de Carvalho, C., Carrión, J.S., Muñiz, F., Rubiales, J.M., Cura, P., Belo, J., Finlayson, S., Martrat, B., van Drooge, B.L., Jiménez-Moreno, G., García-Alix, A., Lozano Rodríguez, J.A., Albert, R.M., Ohkouchi, N., Ogawa, N., Suga, H., Camuera, J., Martínez-Ruiz, F., Villanueva, J., Teruel, O., Davtian, N., Moreira, N., Belaústegui, Z., Rodríguez-Vidal, J., Munuera, M., Menez, A., Finlayson, G., and Finlayson, C. (2024) A Neanderthal's specialised burning structure compatible with tar obtention. Quaternary Science Reviews, 346: 109025. doi:10.1016/j.quascirev.2024.109025. [Open Access]
  • Ohkouchi, N., Isaji, Y., and Ogawa, N.O. (2024) Regulation of nitrogen isotopic ratios of cellular components. Progress in Earth and Planetary Science, 11: 44. doi:10.1186/s40645-024-00646-7. [Open Access]
  • Sugahara, H., Yoshimura, T., Tamenori, Y., Takano, Y., Ogawa, N.O., Chikaraishi, Y., and Ohkouchi, N. (2024) 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, 40, 781-789. doi:10.1007/s44211-023-00503-5. [Open Access]
  • Sun, Y., Blattmann, T.M., Takano, Y., Ogawa, N.O., Isaji, Y., Ishikawa, N.F., and Ohkouchi, N. (2024) 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, 96(47), 18664-18671. doi:10.1021/acs.analchem.4c02851. [Abstract]
  • Takano, Y., Naraoka, H., Dworkin, J.P., Koga, T., Sasaki, K., Sato, H., Oba, Y., Ogawa, N.O., Yoshimura, T., Hamase, K., Ohkouchi, N., Parker, E.T., Aponte, J.C., Glavin, D.P., Furukawa, Y., Aoki, J., Kano, K., Nomura, S.-i.M., Orthous-Daunay, F.-R., Schmitt-Kopplin, P., Hayabusa2-initial-analysis SOM team, 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., and Tachibana, S. (2024) Primordial aqueous alteration recorded in water-soluble organic molecules from the carbonaceous asteroid (162173) Ryugu. Nature Communications, 15, 5708. doi:10.1038/s41467-024-49237-6.[Open Access]
  • Yamamoto, S., Miyairi, Y., Yokoyama, Y., Serisawa, Y., Suga, H., Ogawa, N.O., and Ohkouchi, N. (2024) Compound-specific radiocarbon analysis of sedimentary fatty acids: Potential as a dating tool for lake sediments of Mt. Fuji volcanic region, Japan. Organic Geochemistry, 196, 104860. doi:10.1016/j.orggeochem.2024.104860. [Open Access]
  • Yoshimura, T., Araoka, D., Naraoka, H., Sakai, S., Ogawa, N.O., Yurimoto, H., Morita, M., Onose, M., Yokoyama, T., Bizzarro, M., Tanaka, S., Ohkouchi, N., Koga, T., Dworkin, J.P., 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., Tachibana, S., Takano, Y. (2024) Breunnerite grain and magnesium isotope chemistry reveal cation partitioning during aqueous alteration of asteroid Ryugu. Nature Communications, 15(1), 6809. doi:10.1038/s41467-024-50814-y. [Open Access]

2023
  • Hashiguchi, M., Aoki, D., Fukushima, K., Naraoka, H., Takano, Y., Dworkin, J.P., Dworkin, K.E., Aponte, J.C., Elsila, J.E., Eiler, J.M., Furukawa, Y., Furusho, A., Glavin, D.P., Graham, H.V., Hamase, K., Hertkorn, N., Isa, J., Koga, T., McLain, H.L., Mita, H., Oba, Y., Ogawa, N.O., Ohkouchi, N., Orthous-Daunay, F.-R., Parker, E.T., Ruf, A., Sakai, S., Schmitt-Kopplin, P., Sugahara, H., Thissen, R., Vuitton, V., Wolters, C., Yoshimura, T., Yurimoto, H., Nakamura, T., Noguchi, T., Okazaki, R., Yabuta, H., Sakamoto, K., Tachibana, S., Yada, T., Nishimura, M., Nakato, A., Miyazaki, A., Yogata, K., Abe, M., Usui, T., Yoshikawa, M., Saiki, T., Tanaka, S., Terui, F., Nakazawa, S., Watanabe, S.-i., and Tsuda, Y. (2023) The spatial distribution of soluble organic matter and their relationship to minerals in the asteroid (162173) Ryugu. Earth, Planets and Space, 75: 73. doi:10.1186/s40623-023-01792-w. [Open Access]
  • Kaku, Y., Isobe, N., Ogawa, N.O., Ohkouchi, N., Ikuta, T., Saito, T., and Fujisawa, S. (2023) Chitin nanofiber-coated biodegradable polymer microparticles via one-pot aqueous process. Carbohydrate Polymers, 312: 120828. doi:10.1016/j.carbpol.2023.120828. [Abstract]
  • Naraoka, H., Takano, Y., Dworkin, J.P., Oba, Y., Hamase, K., Furusho, A., Ogawa, N.O., Hashiguchi, M., Fukushima, K., Aoki, D., Schmitt-Kopplin, P., Aponte, J.C., Parker, E.T., Glavin, D.P., McLain, H.L., Elsila, J.E., Graham, H.V., Eiler, J.M., Orthous-Daunay, F.-R., Wolters, C., Isa, J., Vuitton, V., Thissen, R., Sakai, S., Yoshimura, T., Koga, T., Ohkouchi, N., Chikaraishi, Y., Sugahara, H., Mita, H., Furukawa, Y., Hertkorn, N., Ruf, A., Yurimoto, H., Nakamura, T., Noguchi, T., Okazaki, R., Yabuta, H., Sakamoto, K., Tachibana, S., Connolly, H.C., Lauretta, D.S., Abe, M., Yada, T., Nishimura, M., Yogata, K., Nakato, A., Yoshitake, M., Suzuki, A., Miyazaki, A., Furuya, S., Hatakeda, K., Soejima, H., Hitomi, Y., Kumagai, K., Usui, T., Hayashi, T., Yamamoto, D., Fukai, R., Kitazato, K., Sugita, S., Namiki, N., Arakawa, M., Ikeda, H., Ishiguro, M., Hirata, N., Wada, K., Ishihara, Y., Noguchi, R., Morota, T., Sakatani, N., Matsumoto, K., Senshu, H., Honda, R., Tatsumi, E., Yokota, Y., Honda, C., Michikami, T., Matsuoka, M., Miura, A., Noda, H., Yamada, T., Yoshihara, K., Kawahara, K., Ozaki, M., Iijima, Y.-i., Yano, H., Hayakawa, M., Iwata, T., Tsukizaki, R., Sawada, H., Hosoda, S., Ogawa, K., Okamoto, C., Hirata, N., Shirai, K., Shimaki, Y., Yamada, M., Okada, T., Yamamoto, Y., Takeuchi, H., Fujii, A., Takei, Y., Yoshikawa, K., Mimasu, Y., Ono, G., Ogawa, N., Kikuchi, S., Nakazawa, S., Terui, F., Tanaka, S., Saiki, T., Yoshikawa, M., Watanabe, S.-i., and Tsuda, Y. (2023) Soluble organic molecules in samples of the carbonaceous asteroid (162173) Ryugu. Science, 379(6634), eabn9033. doi:10.1126/science.abn9033. [Abstract]
  • Nomaki, H., Kawatani, K., Motomura, Y., Tame, A., Uyeno, D., Ogawa, N.O., Ohkouchi, N., and Shimanaga, M. (2023) 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, 103: e21. doi:10.1017/S0025315423000139. [Open Access]
  • Oba, Y., Koga, T., Takano, Y., Ogawa, N.O., Ohkouchi, N., Sasaki, K., Sato, H., Glavin, D.P., Dworkin, J.P., Naraoka, H., Tachibana, S., 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., and Hayabusa2-initial-analysis, S.O.M.t. (2023) Uracil in the carbonaceous asteroid (162173) Ryugu. Nature Communications, 14: 1292. doi:10.1038/s41467-023-36904-3. [Open Access]
  • Sun, Y., Ogawa, N.O., Ishikawa, N.F., Blattmann, T.M., Takano, Y., and Ohkouchi, N. (2023) 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, 37(17), e9602. doi:10.1002/rcm.9602. [Open Access]
  • Tame, A., Maruyama, T., Ikuta, T., Chikaraishi, Y., Ogawa, N.O., Tsuchiya, M., Takishita, K., Tsuda, M., Hirai, M., Takaki, Y., Ohkouchi, N., Fujikura, K., and Yoshida, T. (2023) mTORC1 regulates phagosome digestion of symbiotic bacteria for intracellular nutritional symbiosis in a deep-sea mussel. Science Advances, 9(34), eadg8364. doi:10.1126/sciadv.adg8364. [Open Access]
  • Yoshimura, T., Takano, Y., Naraoka, H., Koga, T., Araoka, D., Ogawa, N.O., Schmitt-Kopplin, P., Hertkorn, N., Oba, Y., Dworkin, J.P., Aponte, J.C., Yoshikawa, T., Tanaka, S., Ohkouchi, N., Hashiguchi, M., McLain, H., Parker, E.T., Sakai, S., Yamaguchi, M., Suzuki, T., Yokoyama, T., Yurimoto, H., Nakamura, T., Noguchi, T., Okazaki, R., Yabuta, H., Sakamoto, S., 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., Tachibana, S., and Hayabusa2-initial-analysis SOM team. (2023) Chemical evolution of primordial salts and organic sulfur molecules in the asteroid 162173 Ryugu. Nature Communications, 14: 5284. doi:10.1038/s41467-023-40871-0. [Open Access]
  • 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, S., 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., and Eiler, J.M. (2023) Polycyclic aromatic hydrocarbons in samples of Ryugu formed in the interstellar medium. Science, 382(6677), 1411-1416. doi:10.1126/science.adg6304. [Abstract]

2022
  • Endo, I., Sakon, I., Onaka, T., Kimura, Y., Kimura, S., Wada, S., Helton, L.A., Lau, R.M., Kebukawa, Y., Muramatsu, Y., Ogawa, N.O., Ohkouchi, N., Nakamura, M., and Kwok, S. (2022) Towards the identification of carriers of the unidentified infrared (UIR) bands in novae. Proceedings of the International Astronomical Society, 16, 327-331. doi:10.1017/S1743921322000382. [Abstract]
  • Harada, Y., Ito, S., Ogawa, N.O., Yoshikawa, C., Ishikawa, N.F., Yoneda, M., and Ohkouchi, N. (2022) 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, 8:796532. doi:10.3389/fmars.2021.796532. [Open Access]
  • Isaji, Y., Yoshikawa, C., Ogawa, N.O., Matsumoto, K., Makabe, A., Toyoda, S., Ishikawa, N.F., Ogawa, H., Saito, H., Honda, M.C., and Ohkouchi, N. (2022) Nitrogen sources for phytoplankton in the eastern Indian Ocean determined from δ15N of chlorophyll a and divinylchlorophyll a. Geochemistry, Geophysics, Geosystems, 23(4), e2021GC010057. doi:10.1029/2021GC010057. [Open Access]
  • Ishikawa, N.F., Ogawa, N.O., Sun, Y., Chikaraishi, Y., Takano, Y., and Ohkouchi, N. (2022) Integrative 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, 20(9), 531-542. doi:10.1002/lom3.10502. [Open Access]
  • Matsubayashi, J., Kimura, K., Ohkouchi, N., Ogawa, N. O., Ishikawa, N., Chikaraishi, Y., Tsuda, Y., and Minami, H. (2022) Using geostatistical analysis for simultaneous estimation of isoscapes and ontogenetic shifts in isotope ratios of highly migratory marine fish. Frontiers in Marine Science, 9: 1049056. doi:10.3389/fmars.2022.104905. [Open Access]
  • Nitzsche, K.N., Yoshimura, T., Ishikawa, N.F., Kajita, H., Kawahata, H., Ogawa, N.O., Suzuki, K., Yokoyama, Y., and Ohkouchi, N. (2022) Metal contamination in a sediment core from Osaka Bay during the last 400 years. Progress in Earth and Planetary Science, 9:58. doi:10.1186/s40645-022-00517-z. [Open Access]
  • Tsutaya, T., Wong, A., Malim, P.T., Bernard, H., Ogawa, N.O., Ohkouchi, N., Hongo, S., Tajima, T., Kanamori, T., and Kuze, N. (2022) Stable isotopic investigation of the feeding ecology of wild Bornean orangutans. American Journal of Biological Anthropology, 179(2), 276-290. doi:10.1002/ajpa.24598. [Open Access]
  • Yoshikawa, C., Ogawa, N.O., Chikaraishi, Y., Makabe, A., Matsui, Y., Sasai, Y., Wakita, M., Honda, M.C., Mino, Y., Aita, M.N., Fujiki, T., Nunoura, T., Harada, N., and Ohkouchi, N. (2022) Nitrogen Isotopes of Sinking Particles Reveal the Seasonal Transition of the Nitrogen Source for Phytoplankton. Geophysical Research Letters, 49(17), e2022GL098670. doi:10.1029/2022GL098670. [Open Access]

2021
  • Endo, I., Sakon, I., Onaka, T., Kimura, Y., Kimura, S., Wada, S., Helton, L.A., Lau, R.M., Kebukawa, Y., Muramatsu, Y., Ogawa, N.O., Ohkouchi, N., Nakamura, M., and Kwok, S. (2021) On the Nature of Organic Dust in Novae. Astrophysical Journal, 917(2):103. doi:10.3847/1538-4357/ac0cf1. [Open Access]
  • Hsiung, K.-H., Kanamatsu, T., Ikehara, K., Usami, K., Horng, C.-S., Ohkouchi, N., Ogawa, N.O., Saito, S., and Murayama, M. (2021) X-ray fluorescence core scanning, magnetic signatures, and organic geochemistry analyses of Ryukyu Trench sediments: turbidites and hemipelagites. Progress in Earth and Planetary Science, 8:2. doi:10.1186/s40645-020-00396-2. [Open Access]
  • Ishikawa, N.F., Ogawa, N.O., Chikaraishi, Y., Yamaguchi, M., Fujikura, K., Miyairi, Y., Yokoyama, Y., Nagata, T. and Ohkouchi, N. (2021) 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, 8:641282. doi:10.3389/fmars.2021.641282. [Open Access]
  • Kebukawa, Y., Zolensky, M.E., Goodrich, C.A., Ito, M., Ogawa, N.O., Takano, Y., Ohkouchi, N., Kiryu, K., Igisu, M., Shibuya, T., Ohigashi, T., Marcus, M.A., Kodama, Y., and Shaddad, M.H. (2021) Organic matter in carbonaceous chondrite lithologies of Almahata Sitta: Incorporation of previously unsampled carbonaceous chondrite lithologies into ureilitic regolith. Meteoritics and Planetary Science, 56(7), 1311-1327. doi.10.1111/maps.13713. [Abstract]
  • Nitzsche, K.N., Yoshimura, T., Ishikawa, N.F., Ogawa, N.O., Suzuki, K. and Ohkouchi, N. (2021) Trace metal geochemical and Zn stable isotope data as tracers for anthropogenic metal contributions in a sediment core from Lake Biwa, Japan. Applied Geochemistry, 134:105107. doi:10.1016/j.apgeochem.2021.105107. [Abstract]
  • Nomaki, H., Rastelli, E., Alves, A., Suga, H., Ramos, S., Kitahashi, T., Tsuchiya, M., Ogawa, N.O., Matsui, Y., Seike, K., Miyamoto, N., Corinaldesi, C., Manea, E., Ohkouchi, N., Danovaro, R., Nunoura, T., and Amaro, T. (2021) Abyssal fauna, benthic microbes, and organic matter quality across a range of trophic conditions in the western Pacific ocean. Progress in Oceanography, 195:102591. doi:10.1016/j.pocean.2021.102591. [Open Access]
  • Nomaki, H., Rastelli, E., Ogawa, N.O., Matsui, Y., Tsuchiya, M., Manea, E., Corinaldesi, C., Hirai, M., Ohkouchi, N., Danovaro, R., Nunoura, T., Amaro, T. (2021) In situ experimental evidences for responses of abyssal benthic biota to shifts in phytodetritus compositions linked to global climate change. Global Change Biology, 27, 6139-6155. doi:10.1111/gcb.15882. [Open Access]
  • Takano, Y., Oba, Y., Furota, S., Naraoka, H., Ogawa, N.O., Blattmann, T.M., and Ohkouchi, N. (2021) 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, 463, 116529. doi:10.1016/j.ijms.2021.116529. [Open Access]
  • Tsutaya, T., Ogawa, N.O., Nomura, T., Shimizu, M., Ohkouchi, N., and Kuze, N. (2021) Carbon and nitrogen stable isotopic offsets between diet and hair/feces in captive orangutans. Primates, 62, 945-954. doi:10.1007/s10329-021-00940-8. [Abstract]
  • Urai, A., Matsushita, M., Park, H.-D., Imachi, H., Ogawara, M., Iwata, H., Kaneko, M., Ogawa, N.O., Ohkouchi, N., and Takano, Y. (2021) Detection of planktonic coenzyme factor 430 in a freshwater lake: small-scale analysis for probing archaeal methanogenesis. Progress in Earth and Planetary Science, 8:62. doi:10.1186/s40645-021-00450-7. [Open Access]
  • Urai, A., Takano, Y., Imachi, H., Ishii, S., Matsui, Y., Ogawara, M., Tasumi, E., Miyairi, Y., Ogawa, N.O., Yoshimura, T., Inagaki, F., Yokoyama, Y., Murai, D., Kawano, K., Park, H.D., and Ohkouchi, N. (2021) Origin of Deep Methane Associated with a Unique Community of Microorganisms in an Organic- and Iodine-Rich Aquifer. ACS Earth and Space Chemsitry, 5(1), 1-11. doi:10.1021/acsearthspacechem.0c00204. [Abstract]

2020
  • Bialik, O.M., Auer, G., Ogawa, N.O., Kroon, D., Waldmann, N.D., and Ohkouchi, N. (2020) Monsoons, Upwelling, and the Deoxygenation of the Northwestern Indian Ocean in Response to Middle to Late Miocene Global Climatic Shifts. Paleoceanography and Paleoclimatology, 35(2), e2019PA003762. doi:10.1029/2019PA003762. [Open Access]
  • Isaji, Y., Ogawa, N.O., Boreham, C.J., Kashiyama, Y., and Ohkouchi, N. (2020) Evaluation of δ13C and δ15N uncertainties associated with the compound-specific isotope analysis of geoporphyrins. Analytical Chemistry, 92(4), 3152-3160. doi:10.1021/acs.analchem.9b04843. [Abstract]
  • Isaji, Y., Ogawa, N.O., Takano, Y., and Ohkouchi, N. (2020) Quantification and carbon and nitrogen isotopic measurements of heme B in environmental samples. Analytical Chemistry, 92(16), 11213-11222. doi:10.1021/acs.analchem.0c01711. [Abstract]
  • Ishikawa, N.F., Finlay, J.C., Uno, H., Ogawa, N.O., Ohkouchi, N., Tayasu, I., and Power, M.E. (2020) Combined use of radiocarbon and stable carbon isotopes for the source mixing model in a stream food web. Limnology and Oceanography, 65(11), 2688-2696. doi:10.1002/lno.11541. [Abstract]
  • Kebukawa, Y., Zolensky, M.E., Ito, M., Ogawa, N.O., Takano, Y., Ohkouchi, N., Nakato, A., Suga, H., Takeichi, Y., Takahashi, Y., and Kobayashi, K. (2020) Primordial organic matter in the xenolithic clast in the Zag H chondrite: Possible relation to D/P asteroids. Geochimica et Cosmochimica Acta, 271, 61-77. doi:10.1016/j.gca.2019.12.012. [Abstract]
  • Matsubayashi, J., Osada, Y., Tadokoro, K., Abe, Y., Yamaguchi, A., Shirai, K., Honda, K., Yoshikawa, C., Ogawa, N.O., Ohkouchi, N., Ishikawa, N.F., Nagata, T., Miyamoto, H., Nishino, S., and Tayasu, I. (2020) Tracking long‐distance migration of marine fishes using compound‐specific stable isotope analysis of amino acids. Ecology Letters, 23(5), 881-890. doi:10.1111/ele.13496. [Abstract]
  • Matsumoto, H., Kuroda, J., Coccioni, R., Frontalini, F., Sakai, S., Ogawa, N.O., and Ohkouchi, N. (2020) Marine Os isotopic evidence for multiple volcanic episodes during Cretaceous Oceanic Anoxic Event 1b. Scientific Reports, 10, 12601. doi:10.1038/s41598-020-69505-x. [Open Access]
  • Suetsugu, K., Matsubayashi, J., Ogawa, N.O., Murata, S., Sato, R., and Tomimatsu, H., (2020) Isotopic evidence of arbuscular mycorrhizal cheating in a grassland gentian species. Oecologia, 192, 929-937. doi:10.1007/s00442-020-04631-x. [Abstract]
  • Sun, Y., Ishikawa, N.F., Ogawa, N.O., Kawahata, H., Takano, Y., and Ohkouchi, N. (2020) 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, 34(20), e8885. doi:10.1002/rcm.8885. [Abstract]
  • Takizawa, Y., Takano, Y., Choi, B., Dharampal, P.S., Steffan, S.A., Ogawa, N.O., Ohkouchi, N., and Chikaraishi, Y. (2020) 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, 7:50. doi:10.1186/s40645-020-00364-w. [Open Access]
  • Yamamoto, S., Miyairi, Y., Yokoyama, Y., Suga, H., Ogawa, N.O., and Ohkouchi, N. (2020) Compound-Specific Radiocarbon Analysis of Organic Compounds from Mount Fuji Proximal Lake (Lake Kawaguchi) Sediment, Central Japan. Radiocarbon, 62(2), 439-451. doi:10.1017/RDC.2019.158. [Abstract]

2019
  • Furukawa, Y., Chikaraishi, Y., Ohkouchi, N., Ogawa, N.O., Glavin, D.P., Dworkin, J.P., Abe, C., and Nakamura, T. (2019) Extraterrestrial ribose and other sugars in primitive meteorites. Proceedings of the National Academy of Sciences, 116(49), 24440-24445. doi:10.1073/pnas.1907169116. [Open Access]
  • Goulden, S.K.E., Ohkouchi, N., Freeman, K.H., Chikaraishi, Y., Ogawa, N.O., Suga, H., Chadwick, O., and Houlton, B.Z. (2019) Strong correspondence between nitrogen isotope composition of foliage and chlorin across a rainfall gradient: implications for paleo-reconstruction of the nitrogen cycle. Biogeosciences, 16(19), 3869-3882. doi:10.5194/bg-16-3869-2019. [Open Access]
  • Isaji, Y., Kawahata, H., Ogawa, N.O., Kuroda, J., Yoshimura, T., Jiménez-Espejo, F.J., Makabe, A., Shibuya, T., Lugli, S., Santulli, A., Manzi, V., Roveri, M., and Ohkouchi, N. (2019) Efficient recycling of nutrients in modern and past hypersaline environments. Scientific Reports, 9, 3718. doi:10.1038/s41598-019-40174-9. [Open Access]
  • Isaji, Y., Kawahata, H., Takano, Y., Ogawa, N.O., Kuroda, J., Yoshimura, T., Lugli, S., Manzi, V., Roveri, M., and Ohkouchi, N. (2019) 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, 7, 85. doi:10.3389/feart.2019.00085. [Abstract]
  • Isaji, Y., Yoshimura, T., Araoka, D., Kuroda, J., Ogawa, N.O., Kawahata, H., and Ohkouchi, N. (2019) Magnesium Isotope Fractionation during Synthesis of Chlorophyll a and Bacteriochlorophyll a of Benthic Phototrophs in Hypersaline Environments. ACS Earth and Space Chemistry, 3, 1073-1079. doi:10.1021/acsearthspacechem.9b00013. [Abstract]
  • Nomaki, H., Uejima, Y., Ogawa, N.O., Yamane, M., Watanabe, H.K., Senokuchi, R., Bernhard, J.M,, Kitahashi, T., Miyairi, Y., Yokoyama, Y., Ohkouchi, N., and Shimanaga, M. (2019) Nutritional source of meio- and macrofauna athydrothermal vents and adjacent fields: natural-abundance radiocarbon and stable isotope analyses. Marine Ecology Progress Series, 622, 49-65. doi:10.3354/meps13053. [Open Access]
  • Sugahara, H., Takano, Y., Tachibana, S., Sugawara, I., Chikaraishi, Y., Ogawa, N.O., Ohkouchi, N., Kouchi, A., and Yurimoto, H. (2019) Molecular and isotopic compositions of nitrogen-containing organic molecules formed during UV-irradiation of simulated interstellar ice. Geochemical Journal, 53(1), 5-20. doi:10.2343/geochemj.2.0553. [Open Access]

2018
  • Furota, S., Ogawa, N. O., Takano, Y., Yoshimura, T., and Ohkouchi, N. (2018) 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, 1095, 191-197. doi:10.1016/j.jchromb.2018.07.033. [Abstract]
  • Ishikawa, N.F., Itahashi, Y., Blattmann, T.M., Takano, Y., Ogawa, N.O., Yamane, M., Yokoyama, Y., Nagata, T., Yoneda, M., Haghipour, N., Eglinton, T.I., and Ohkouchi, N. (2018) Improved method for isolation and purification of underivatized amino acids for radiocarbon analysis. Analytical Chemistry, 90(20), 12035-12041. doi:10.1021/acs.analchem.8b02693. [Abstract]
  • Kondo, Y., Okada, S., Ohtsuka, S., Hirabayashi, T., Adachi, A., Urata, M., Toshino, S., Miyake, H., Ogawa, N.O., and Ohkouchi, N. (2018) Piscivory of the Japanese giant box jellyfish Morbakka virulenta. Plankton and Benthos Research, 13(2), 66-74. doi:10.3800/pbr.13.66. [Open Access]
  • Sekine, Y., Kodama,K., Kobayashi, T., Obata, S., Chang, Y., Ogawa, N.O., Takano, Y., Ohkouchi, N., Saiki, K., and Sekine, T. (2018) An experimental study on impact‐induced alterations of planetary organic simulants. Meteoritics & Planetary Science, 53(6), 1267-1282. doi:10.1111/maps.13075. [Abstract]
  • Senokuchi,R., Nomaki, H., Watanabe, H.K., Kitahashi, T., Ogawa, N.O., and Shimanaga, M. (2018) Chemoautotrophic food availability influences copepod assemblage composition at deep hydrothermal vent sites within sea knoll calderas in the northwestern Pacific. Marine Ecology Progress Series, 607, 37-51. doi:10.3354/meps12804. [Abstract]
  • Takano, Y., Chikaraishi, Y., Imachi, H., Miyairi, Y., Ogawa, N.O., Kaneko, M., Yokoyama, Y., Krüger, M., and Ohkouchi, N. (2018) Insight into anaerobic methanotrophy from 13C/12C- amino acids and 14C/12C-ANME cells in seafloor microbial ecology. Scientific Reports, 8:14070. doi:10.1038/s41598-018-31004-5. [Open Access]

2017
  • Campbell, C.J., Nelson, D.M., Ogawa, N.O., Chikaraishi, Y., and Ohkouchi, N. (2017) Trophic position and dietary breadth of bats revealed by nitrogen isotopic composition of amino acids. Scientific Reports, 7:15932. doi:10.1038/s41598-017-15440-3. [Open Access]
  • Isaji, Y., Kawahata, H., Kuroda, J., Yoshimura, T., Ogawa, N.O., Suzuki, A., Shibuya, T., Jiménez-Espejo, F.J., Lugli, S., Santulli, A., Manzi, V., Roveri, M., and Ohkouchi, N. (2017) Biological and physical modification of carbonate system parameters along the salinity gradient in shallow hypersaline solar salterns in Trapani, Italy. Geochimica et Cosmochimica Acta, 208, 354-367. doi:10.1016/j.gca.2017.04.013. [Abstract]
  • Ishikawa, M., Ogawa, N.O., Ohkouchi, N., Husana, D.E.M., and Kase, T. (2017) 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, 51(3), 241-250. doi:10.2343/geochemj.2.0465. [Abstract]
  • Ohkouchi, N., Chikaraishi, Y., Close, H.G., Fry, B., Larsen, T., Madigan, D.J., McCarthy, M.D., McMahon, K.W., Nagata, T., Naito, Y.I., Ogawa, N.O., Popp, B.N., Steffan, S., Takano, Y., Tayasu, I., Wyatt, A.S.J., Yamaguchi, Y.T., and Yokoyama, Y. (2017) Advances in the application of amino acid nitrogen isotopic analysis in ecological and biogeochemical studies. Organic Geochemistry, 113, 150-174. doi:10.1016/j.orggeochem.2017.07.009. [Abstract]
    The Most Cited Organic Geochemistry Articles
  • Sugahara, H., Takano, Y., Ogawa, N.O., Chikaraishi, Y., and Ohkouchi, N. (2017) Nitrogen isotopic fractionation in ammonia during adsorption on silicate surfaces. ACS Earth and Space Chemistry, 1(1), 24-29. doi:10.1021/acsearthspacechem.6b00006. [Open Access]
  • Yamaguchi, Y.T., Chikaraishi, Y., Takano, Y., Ogawa, N.O., Imachi, H., Yokoyama, Y., and Ohkouchi, N. (2017) 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, 111, 101-112. doi:10.1016/j.orggeochem.2017.04.004. [Abstract]

2016
  • Chan, Q.H.S., Chikaraishi, Y., Takano, Y., Ogawa, N.O., and Ohkouchi, N. (2016) Amino acid compositions in heated carbonaceous chondrites and their compound-specific nitrogen isotopic ratios. Earth, Planets and Space, 68(7). doi:10.1186/s40623-016-0382-8. [Open Access]
  • Ishikawa, N.F., Togashi, H., Kato, Y., Yoshimura, M., Kohmatsu, Y., Yoshimizu, C., Ogawa, N.O., Ohte, N., Tokuchi, N., Ohkouchi, N., and Tayasu, I. (2016) Terrestrial-aquatic linkage in stream food webs along a forest chronosequence: multi-isotopic evidence. Ecology, 97(5), 1146-1158. doi:10.1890/15-1133.1. [Abstract]
  • Kaneko, M., Takano, Y., Ogawa, N.O., Sato, Y., Yoshida, N., and Ohkouchi, N. (2016) Estimation of methanogenesis by quantification of coenzyme F430 in marine sediments. Geochemical Journal, 50(6), 453-460. doi:10.2343/geochemj.2.0410. [Open Access]
  • Kondo, Y., Ohtsuka, S., Hirabayashi, T., Okada, S., Ogawa, N.O., Ohkouchi, N., Shimazu, T., and Nishikawa, J. (2016) Seasonal changes in infection with trematode species utilizing jellyfish as hosts: evidence of transmission to definitive host fish via medusivory. Parasite, 23(16). doi:10.1051/parasite/2016016. [Open Access]
  • Naeher, S., Suga, H., Ogawa, N.O., Schubert, C.J., Grice, K., and Ohkouchi, N. (2016) Compound-specific carbon and nitrogen isotopic compositions of chlorophyll a and its derivatives reveal the eutrophication history of Lake Zurich (Switzerland). Chemical Geology, 443, 210-219. doi:10.1016/j.chemgeo.2016.09.005. [Abstract]
  • Naeher, S., Suga, H., Ogawa, N.O., Takano, Y., Schubert, C.J., Grice, K., and Ohkouchi, N. (2016) 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, 443, 198-209. doi:10.1016/j.chemgeo.2016.04.029. [Abstract]
  • Ohkouchi, N., Shibata, H., Chikaraishi, Y., Nomaki, H., Ogawa, N.O., Nagata, T., Goto, T., Fujikura, K., and Kitazato, H. (2016) 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, 72(4), 629-639. doi:10.1007/s10872-016-0359-z. [Abstract]
  • Yoshikawa, C., Abe, H., Aita, M.N., Breider, F., Kuzunuki, K., Toyoda, S., Ogawa, N.O., Suga, H., Ohkouchi, N., Danielache, S.O., Wakita, M., Honda, M.C., and Yoshida, N. (2016) Insight into nitrous oxide production processes in the western North Pacific based on a marine ecosystem isotopomer model. Journal of Oceanography, 72(3), 491-508. doi:10.1007/s10872-015-0308-2. [Abstract]
  • Yoshimura, T., Kuroda, J., Lugli, S., Tamenori, Y., Ogawa, N.O., Jiménez-Espejo, F.J., Isaji, Y., Roveri, M., Manzi, V., Kawahata, H., and Ohkouchi, N. (2016) An X-ray spectroscopic perspective on Messinian evaporite from Sicily: Sedimentary fabrics, element distributions, and chemical environments of S and Mg. Geochemistry, Geophysics, Geosystems, 17(4), 1383-1400. doi:10.1002/2015GC006233. [Open Access]

2015
  • Isaji, Y., Kawahata, H., Ohkouchi, N., Ogawa, N.O., Murayama, M., Inoue, K., and Tamaki, K. (2015) 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, 120(11), 7253-7270. doi:10.1002/2015JC010982. [Open Access]
  • Ishikawa, N.F., Yamane, M., Suga, H., Ogawa, N.O., Yokoyama, Y., and Ohkouchi, N. (2015) Chlorophyll a-specific Δ14C, δ13C and δ15N values in stream periphyton: implications for aquatic food web studies. Biogeosciences, 12(22), 6781-6789. doi:10.5194/bg-12-6781-2015. [Open Access]
  • Kruse, S., Pakhomov, E.A., Hunt, B.P.V., Chikaraishi, Y., Ogawa, N.O., and Bathmann, U. (2015) Uncovering the trophic relationship between Themisto gaudichaudii and Salpa thompsoni in the Antarctic Polar Frontal Zone. Marine Ecology Progress Series, 529, 63-74. doi:10.3354/meps11288. [Abstract]
  • Kuroda. J., Ihoriya, N., Hori, R.S., Ogawa, N.O., Ikehara, M., Tanimizu, M., and Ohkouchi, N. (2015) Geochemistry of an Aptian bedded chert succession from the deep Pacific basin: New insights into Cretaceous oceanic anoxic event (OAE) 1a. Geological Society of America Special Papers, 511, 305-328. doi:10.1130/2015.2511(16). [Abstract]
  • Miyachi, S., Mayahara, T., Tsushima, K., Sasada, K., Kohno, E., Ogawa, N.O., Chikaraishi, Y., and Ohkouchi, N. (2015) 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, 81(6), 1053-1062. doi:10.1007/s12562-015-0923-2. [Abstract]
  • Ohkouchi, N., Ogawa, N.O., Chikaraishi, Y., Tanaka, H., and Wada, E. (2015) Biochemical and physiological bases for the use of carbon and nitrogen isotopes in environmental and ecological studies. Progress in Earth and Planetary Science, 2(1), doi:10.1186/s40645-015-0032-y. [Open Access] 
    PEPS The Most Accessed Paper Award 2017
    PEPS The Most Cited Paper Award 2018
  • Sakon, I., Sato, K., Onaka, T., Kimura, S., Wada, S., Ogawa, N.O., Ohkouchi, N., and Pathak, A. (2015) Infrared Properties of laboratory-synthesized Nitrogen-containing Carbonaceous Composites (NCCs). Asian Journal of Physics, 24(8), 1143-1150. [Abstract]

2014
  • Chikaraishi, Y., Steffan, S.A., Ogawa, N.O., Ishikawa, N.F., Sasaki, Y., Tsuchiya, M., and Ohkouchi, N. (2014) High-resolution food webs based on nitrogen isotopic composition of amino acids. Ecology and Evolution, 4(12), 2423-2449. doi:10.1002/ece3.1103. [Open Access]
  • Kaneko, M., Takano, Y., Chikaraishi, Y., Ogawa, N.O., Asakawa, S., Watanabe, T., Shima, S., Krüger, M., Matsushita, M., Kimura, H., and Ohkouchi, N. (2014) Quantitative analysis of coenzyme F430 in environmental samples: a new diagnostic tool for methanogenesis and anaerobic methane oxidation. Analytical Chemistry, 86(7), 3633-3638. doi:10.1021/ac500305j. [Open Access]
  • Setoguchi, Y., Nomaki, H., Kitahashi, T., Watanabe, H., Inoue, K., Ogawa, N.O., and Shimanaga, M. (2014) 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, 161(8), 1775-1785. doi:10.1007/s00227-014-2460-4. [Abstract]

2013
  • Goto, K.T., Sekine, Y., Suzuki, K., Tajika, E., Senda, R., Nozaki, T., Tada, R., Goto, K., Yamamoto, S., Maruoka, T., Ohkouchi, N., and Ogawa, N.O. (2013) 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, 376, 145-154. doi:10.1016/j.epsl.2013.06.018. [Abstract]
  • Kurosawa, K., Sugita, S., Ishibashi, K., Hasegawa, S., Sekine, Y., Ogawa, N.O., Kadono, T., Ohno, S., Ohkouchi, N., Nagaoka, Y., and Matsui, T. (2013) Hydrogen cyanide production due to mid-size impacts in a redox-neutral N2-rich atmosphere. Origins of Life and Evolution of Biospheres, 43(3), 221-245. doi:10.1007/s11084-013-9339-0. [Abstract]
  • Ogawa, N.O., Chikaraishi, Y., and Ohkouchi, N. (2013) 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, 28(5), 697-702. doi:10.1007/s11284-012-0967-z. [Abstract]
  • Wada, E., Ishii, R., Aita, M.N., Ogawa, N.O., Kohzu, A., Hyodo, F., and Yamada, Y. (2013) 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, 28(2), 173-181. doi:10.1007/s11284-012-1024-7. [Abstract]

2012
  • Ijiri, A., Harada, N., Hirota, A., Tsunogai, U., Ogawa, N.O., Itaki, T., Khime, B-K., and Uchida, M. (2012) Biogeochemical processes involving acetate in sub-seafloor sediments from the Bering Sea shelf break. Organic Geochemistry, 48, 47-55. doi:10.1016/j.orggeochem.2012.04.004. [Abstract]
  • Miller, M.J., Chikaraishi, Y., Ogawa, N.O., Yamada, Y., Tsukamoto, K., and Ohkouchi, N. (2012) A low trophic position of Japanese eel larvae indicates feeding on marine snow. Biology Letters, 9(1). doi:10.1098/rsbl.2012.0826. [Open Access]
  • Sakuma, H., Tada, R., Ikeda, M., Kashiyama, Y., Ohkouchi, N., Ogawa, N.O., Watanabe, S., Tajika, E., and Yamamoto, S. (2012) High-resolution lithostratigraphy and organic carbon isotope stratigraphy of the Lower Triassic pelagic sequence in central Japan. Island Arc, 21(2), 79-100. doi:10.1111/j.1440-1738.2012.00809.x. [Abstract]
  • Takano, Y., Tyler, J.J., Kojima, H., Yokoyama, Y., Tanabe, Y., Sato, T., Ogawa, N.O., Ohkouchi, N., and Fukui, M. (2012) Holocene lake development and glacial-isostatic uplift at Lake Skallen and Lake Oyako, Lützow-Holm Bay, East Antarctica: Based on biogeochemical facies and molecular signatures. Applied Geochemistry, 27(12), 2546-2559. doi:10.1016/j.apgeochem.2012.08.009. [Open Access]

2011
  • Aita, M.N., Tadokoro, K., Ogawa, N.O., Hyodo, F., Ishii, R., Smith, S.L., Saino, T., Kishi, M.J., Saitoh, S.-I., and Wada, E. (2011) Linear relationship between carbon and nitrogen isotope ratios along simple food chains in marine environments. Journal of Plankton Researchs, 33(11), 1629-1642. doi:10.1093/plankt/fbr070. [Open Access]
  • Chikaraishi, Y., Ogawa, N.O., Doi, H., and Ohkouchi, N. (2011) 15N/14N ratios of amino acids as a tool for studying terrestrial food webs: a case study of terrestrial insects (bees, wasps, and hornets). Ecological Research, 26(4), 835-844. doi:10.1007/s11284-011-0844-1. [Open Access] Ecological Research Award, 2011
  • Enge, A.J., Nomaki, H., Ogawa, N.O., Witte, U., Moeseneder, M.M., Lavik, G., Ohkouchi, N., Kitazato, H., Kučera, M., and Heinz, P. (2011) Response of the benthic foraminiferal community to a simulated short-term phytodetritus pulse in the abyssal North Pacific. Marine Ecology Progress Series, 438, 129-142. doi:10.3354/meps09298. [Open Access]
  • Kuroda, J., Tanimizu, M., Hori, R.S., Suzuki, K., Ogawa, N.O., Tejada, M.L.G., Coffin, M.F., Coccioni, R., Erba, E., and Ohkouchi, N. (2011) Lead isotopic record of Barremian-Aptian marine sediments: Implications for large igneous provinces and the Aptian climatic crisis. Earth and Planetary Science Letters, 307, 126-134. doi:10.1016/j.epsl.2011.04.021. [Abstract]
  • Nomaki, H., Ogawa, N.O., Takano, Y., Suga, H., Ohkouchi, N., and Kitazato, H. (2011) Differing utilization of glucose and algal particulate organic matter by deep-sea benthic organisms of Sagami Bay, Japan. Marine Ecology Progress Series, 431, 11-24. doi:10.3354/meps09144. [Open Access]
  • Sekine, Y., Suzuki, K., Senda, R., Goto, K.T., Tajika, E., Tada, R., Goto, K., Yamamoto, S., Ohkouchi, N., Ogawa, N.O., and Maruoka, T. (2011) Osmium evidence for synchronicity between a rise in atmospheric oxygen and Palaeoproterozoic deglaciation. Nature Communications, 2(502). doi:10.1038/ncomms1507. [Open Access]
  • Tayasu, I., Hirasawa, R., Ogawa, N.O., Ohkouchi, N., and Yamada, K. (2011) 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, 12(3), 261-266. doi:10.1007/s10201-011-0345-5. [Abstract]
  • Toyoda, S., Yano, M., Nishimura, S., Akiyama, H., Hayakawa, A., Koba, K., Sudo, S., Yagi, K., Makabe, A., Tobari, Y., Ogawa, N.O., Ohkouchi, N., Yamada, K., and Yoshida, N. (2011) Characterization and production and consumption processes of N2O emitted from temperate agricultural soils determined via isotopomer ratio analysis. Global Biogeochemical Cycles, 25(2), GB2008. doi:10.1029/2009GB003769. [Open Access]
  • Yamazaki, A., Watanabe, T., Ogawa, N.O., Ohkouchi, N., Shirai, K., Toratani, M., and Uematsu, M. (2011) 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, 116, G04005. doi:10.1029/2011JG001697. [Open Access]

2010
  • Chikaraishi, Y., Ogawa, N.O., and Ohkouchi, N. (2010) Further evaluation of trophic level estimation based on nitrogen isotopic composition of amino acids.In: Earth, Life, and Isotopes (Eds. N. Ohkouchi, I. Tayasu, and K. Koba), Kyoto University Press, pp.37-51.
  • Chikaraishi, Y., Takano, Y., Ogawa, N.O., and Ohkouchi, N. (2010) Instrumental optimization of compound-specific nitrogen isotope analysis of amino acids by gas chromatography/combustion/isotope ratio mass spectrometry. In: Earth, Life, and Isotopes (Eds. N. Ohkouchi, I. Tayasu, and K. Koba), Kyoto University Press, pp.367-386.
  • Ijiri, A., Harada, N., Ogawa, N.O., Sakamoto, T., and Nakatsuka, T. (2010) Carbon isotope biogeochemistry of acetate in sub-seafloor sediments in the Sea of Okhotsk near Sahalin Island, Russsia. Researches in organic geochemistry, 26, 95-105. [Open Access]
  • Kashiyama, Y., Ogawa, N.O., Chikaraishi, Y., Kashiyama, N., Sakai, S., Tanabe, K., and Ohkouchi, N. (2010) Reconstructing the life history of modern and fossil nautiloids based on the nitrogen isotopic composition of shell organic matter and amino acids. Cephalopods - Present and Past, Tokai University Press, Tokyo, pp.67-75. [PDF]
  • Kashiyama, Y., Ogawa, N.O., Nomoto, S., Kitazato, H., and Ohkouchi, N. (2010) Nitrogen and carbon isotopic compositions of copper, nickel, and vanadyl porphyrins in Cretaceous black shales. In: Earth, Life, and Isotopes (Eds. N. Ohkouchi, I. Tayasu, and K. Koba), Kyoto University Press, pp.313-335.
  • Kusch, S., Kashiyama, Y., Ogawa, N.O., Altabet, M., Butzin, M., Friedrich, J., Ohkouchi, N., and Mollenhauer, G. (2010) Implications for chloro- and pheopigment synthesis and preservation from combined compound-specific δ13C, δ15N, and Δ14C analysis. Biogeosciences, 7(12), 4105-4118. doi:10.5194/bg-7-4105-2010. [Open Access]
  • Nomaki, H., Ogawa, N.O., Ohkouchi, N., Toyofuku, T., and Kitazato, H. (2010) The role of meiofauna in deep-sea benthic food webs revealed by carbon and nitrogen stable isotope analyses. In: Earth, Life, and Isotopes (Eds. N. Ohkouchi, I. Tayasu, and K. Koba), Kyoto University Press, pp.119-138.
  • Ogawa, N.O., Nagata, T., Kitazato, H., and Ohkouchi, N. (2010) Ultra-sensitive elemental analyzer/isotope ratio mass spectrometer for stable nitrogen and carbon isotope analyses. In: Earth, Life, and Isotopes (Eds. N. Ohkouchi, I. Tayasu, and K. Koba), Kyoto University Press, pp.339-353. [PDF]
  • Ogawa, N.O., Wada, E., Smirnova-Zalumi, N.S., Melnik, N.G., Bondarenko, N.A., Shimaraev, M.N., Smirnov, V.V., and Yoshioka, T. (2010) Fish scales as a record of atmospheric change. In: Earth, Life, and Isotopes (Eds. N. Ohkouchi, I. Tayasu, and K. Koba), Kyoto University Press, pp.263-270.
  • Ohkouchi, N., Chikaraishi, Y., Kashiyama, Y., and Ogawa, N.O. (2010) Isotopomers of chlorophyll nuclei: Theories and an application. In: Earth, Life, and Isotopes (Eds. N. Ohkouchi, I. Tayasu, and K. Koba), Kyoto University Press, pp.271-290.
  • Sekine, Y., Tajika, E., Ohkouchi, N., Ogawa, N.O., Goto, K., Tada, R., Yamamoto, S., and Kirschvink, J.L. (2010) Anomalous negative excursion of carbon isotope in organic carbon after the last Paleoproterozoic glaciation in North America. Geochemistry Geophysics Geosystems, 11(8), Q08019. doi:10.1029/2010GC003210. [Open Access]
  • Takano, Y., Chikaraishi, Y., Ogawa, N.O., Nomaki, H., Morono, Y., Inagaki, F., Kitazato, H., Hinrichs, K.-U., and Ohkouchi, N. (2010) Sedimentary membrane lipids recycled by deep-sea benthic archaea. Nature Geoscience, 3, 858-861. doi:10.1038/ngeo983. [Abstract]
  • Takano, Y., Kashiyama, Y., Ogawa, N.O., Chikaraishi, Y., and Ohkouchi, N. (2010) 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, 24(16), 2317-2323. doi:10.1002/rcm.4651. [Open Access]
  • Takano, Y., Yokoyama, Y., Tyler, J.J., Kojima, H., Fukui, M., Sato, T., Ogawa, N.O., Suzuki, N., Kitazato, H., and Ohkouchi, N. (2010) Crustal uplifting rate associated with late-Holocene glacial-isostatic rebound at Skallen and Skarvsnes, Lützow-Holm Bay, East Antarctica: evidence of a synchrony in sedimentary and biological facies on geological setting. Biogeosciences Discuss, 7, 4341-4384. doi:10.5194/bgd-7-4341-2010. [Open Access]
  • Tyler, J., Kashiyama, Y., Ohkouchi, N., Ogawa, N.O., Yokoyama, Y., Chikaraishi, Y., Staff, R.A., Ikehara, M., Bronk Ramsey, C., Bryant, C., Brock, F., Gotanda, K., Haraguchi, T., Yonenobu, H., and Nakagawa, T. (2010) Tracking aquatic change using chlorin-specific carbon and nitrogen isotopes: The last glacial-interglacial transition at Lake Suigetsu, Japan. Geochemistry, Geophysics, Geosystems, 11(9), Q09010. doi:10.1029/2010GC003186. [Open Access]
  • Yamaguchi, K., Oguri, K., Ogawa, N.O., Sakai, S., Hirano, S., Kitazato, H., and Ohkouchi, N. (2010) 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, 294(1-2), 72-82. doi:10.1016/j.palaeo.2009.10.024. [Abstract]

2009
  • Chikaraishi, Y., Ogawa, N.O., Kashiyama, Y., Takano, Y., Suga, H., Tomitani, A., Miyashita, H., Kitazato, H., and Ohkouchi, N. (2009) Determination of aquatic food-web structure based on compound-specific nitrogen isotopic composition of amino acids. Limnology and Oceanography: Methods, 7(11), 740-750. doi:10.4319/lom.2009.7.740. [Open Access]
  • Nishikawa, J., Kohzu, A., Boontanon, N., Iwata, T., Tanaka, T., Ogawa, N.O., Ishii, R., and Wada, E. (2009) Isotopic composition of nitrogenous compounds with emphasis on anthropogenic loading in river ecosystems. Isotopes in Environmental and Health Studies, 45(1), 27-40. doi:10.1080/10256010802522127. [Abstract]
  • Nomaki, H., Ohkouchi, N., Heinz, P., Suga, H., Chikaraishi, Y., Ogawa, N.O., Matsumoto, K., and Kitazato, H. (2009) Degradation of algal lipids by deep-sea benthic foraminifera: An in situ tracer experiment. Deep Sea Research Part I: Oceanographic Research Papers, 56(9), 1488-1503. doi:10.1016/j.dsr.2009.04.013. [Abstract]
  • Ruttenberg, K.C., Ogawa, N.O., Tamburini, F, Briggs, R.A., Colasacco, N.D., and Joyce, E. (2009) Improved, high-throughput approach for phosphorus speciation in natural sediments via the SEDEX sequential extraction method. Limnology and Oceanography: Methods, 7(5), 319-333. doi:10.4319/lom.2009.7.319. [Open Access]
  • Takano, Y., Chikaraishi, Y., Ogawa, N.O., Kitazato, H., and Ohkouchi, N. (2009) Compound-specific nitrogen isotope analysis of D-alanine, L-alanine, and valine: Application of diastereomer separation to δ15N and microbial peptidoglycan studies. Analytical Chemistry, 81(1), 394-399. doi:10.1021/ac802077v. [Open Access]

2008
  • Chikaraishi, Y., Kashiyama, Y., Ogawa, N.O., Kitazato, H., Satoh, M., Nomoto, S., and Ohkouchi, N. (2008) A compound-specific isotope method for measuring the stable nitrogen isotopic composition of tetrapyrroles. Organic Geochemistry, 39(5), 510-520. doi:10.1016/j.orggeochem.2007.08.010. [Abstract]
  • Kashiyama, Y., Miyashita, H., Ohkubo, S., Ogawa, N.O., Chikaraishi, Y., Takano, Y., Suga, H., Toyofuku, T., Nomaki, H., Kitazato, H., Nagata, T., and Ohkouchi, N. (2008) Evidence of global chlorophyll d. Science, 321(5889), pp.658. doi:10.1126/science.1158761. [Abstract]
  • Kashiyama, Y., Ogawa, N.O., Kuroda, J., Shiro, M., Nomoto, S., Tada, R., Kitazato, H., and Ohkouchi, N. (2008) Diazotrophic cyanobacteria as the major photoautotrophs during mid-Cretaceous oceanic anoxic events: Nitrogen and carbon isotopic evidence from sedimentary porphyrin. Organic Geochemistry, 39(5), 532-549. doi:10.1016/j.orggeochem.2007.11.010. [Abstract]
  • Kashiyama, Y., Ogawa, N.O., Shiro, M., Tada, R., Kitazato, H., and Ohkouchi, N. (2008) Reconstruction of the biogeochemistry and ecology of photoautotrophs based on the nitrogen and carbon isotopic compositions of vanadyl porphyrins from Miocene siliceous sediments. Biogeosciences, 5(3), 797-816. doi:10.5194/bg-5-797-2008. [Open Access]
  • Nomaki, H., Ogawa, N.O., Ohkouchi, N., Suga, H., Toyofuku, T., Shimanaga, M., Nakatsuka, T., and Kitazato, H. (2008) Benthic foraminifera as trophic links between phytodetritus and benthic metazoans: carbon and nitrogen isotopic evidence. Marine Ecology Progress Series, 357, 153-164. doi:10.3354/meps07309. [Open Access]
  • Ohkouchi, N., Nakajima, Y., Ogawa, N.O., Chikaraishi, Y., Suga, H., Sakai, S., and Kitazato, H. (2008) 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, 39(5), 521-531. doi:10.1016/j.orggeochem.2007.11.002. [Abstract]
  • Suzuki, Y., Chikaraishi, Y., Ogawa, N.O., Ohkouchi, N., and Korenaga, T. (2008) Geographical origin of polished rice based on multiple element and stable isotope analyses. Food Chemistry, 109(2), 470-475. doi:10.1016/j.foodchem.2007.12.063. [Abstract]

2007
  • Chikaraishi, Y., Kashiyama, Y., Ogawa, N.O., Kitazato, H., and Ohkouchi, N. (2007) Metabolic control of nitrogen isotopic composition of amino acids in macroalgae and gastropods: implications for aquatic food web studies. Marine Ecology Progress Series, 342, 85-90. doi:10.3354/meps342085. [Open Access]
  • Kuroda, J., Ogawa, N.O., Tanimizu, M., Coffin, M.F., Tokuyama, H., Kitazato, H., and Ohkouchi, N. (2007) Contemporaneous massive subaerial volcanism and late Cretaceous Oceanic Anoxic Event 2. Earth and Planetary Science Letters, 256(1-2), 211-223. doi:10.1016/j.epsl.2007.01.027. [Abstract]

2006
  • Nomaki, H., Heinz, P., Nakatsuka, T., Shimanaga, M., Ohkouchi, N., Ogawa, N.O., Kogure, K., Ikemoto, E., and Kitazato, H. (2006) Different ingestion patterns of 13C-labeled bacteria and algae by deep-sea benthic foraminifera. Marine Ecology Progress Series, 310, 95-108. doi:10.3354/meps310095. [Open Access]
  • Ohkouchi, N., Kashiyama, Y., Kuroda, J., Ogawa, N.O., and Kitazato, H. (2006) The importance of diazotrophic cyanobacteria as primary producers during Cretaceous Oceanic Anoxic Event 2. Biogeosciences, 3(4), 467-478. doi:10.5194/bg-3-467-2006. [Open Access]
  • Yokoyama, Y., Naruse, T., Ogawa, N.O., Tada, R., Kitazato, H., and Ohkouchi, N. (2006) Dust influx reconstruction during the last 26,000 years inferred from a sedimentary leaf wax record from Japan Sea. Global and Planetary Change, 54(3-4), 239-250. doi:10.1016/j.gloplacha.2006.06.022. [Abstract]

2005
  • Chikaraishi, Y., Matsumoto, K., Ogawa, N.O., Suga, H., Kitazato, H., and Ohkouchi, N. (2005) Hydrogen, carbon and nitrogen isotopic fractionations during chlorophyll biosynthesis in C3 higher plants. Phytochemistry, 66(8), 911-920. doi:10.1016/j.phytochem.2005.03.004. [Abstract]
  • Ohkouchi, N., Nakajima, Y., Okada, H., Ogawa, N.O., Suga, H., Oguri, K., and Kitazato, H. (2005) Biogeochemical processes in the saline meromictic Lake Kaiike, Japan: implications from molecular isotopic evidences of photosynthetic pigments. Environmental Microbiology, 7(7), 1009-1016. doi:10.1111/j.1462-2920.2005.00772.x. [Abstract]

2004
  • Nakajima, Y., Shimizu, H., Ogawa, N.O., Sakamoto, T., Okada, H., Koba, K., Kitazato, H., and Ohkouchi, N. (2004) Vertical distributions of stable isotopic compositions and bacteriochlorophyll homologues in suspended particulate matter in saline meromictic Lake Abashiri. Limnology, 5(3), 185-189. doi:10.1007/s10201-004-0125-6. [Abstract]

1997-2003
  • Ogawa, N.O., Koitabashi, T., Oda, H., Nakamura, T., Ohkouchi, N., and Wada, E. (2001) Fluctuations of nitrogen isotope ratio of gobiid fish (Isaza) specimens and sediments in Lake Biwa, Japan, during the 20th century. Limnology and Oceanography, 46(5), 1228-1236. doi:10.4319/lo.2001.46.5.1228. [Open Access]
  • Ogawa, N.O., Yoshii, K., Melnik, N.G., Bondarenko, N.A., Timoshkin, O.A., Smirnova-Zalumi, N.S., Smirnov, V.V., and Wada, E. (2000) Carbon and nitrogen isotope studies of pelagic ecosystem and environmental fluctuations of Lake Baikal. In: Lake Baikal. A Mirror in Time and Space for Understanding Global Change Processes. (Ed. K. Minoura). pp.262-272. Elsevier Science. [Abstract]
  • Ogawa, N., and Ogura, N. (1997) Dynamics of Particulate Organic Matter in the Tamagawa Estuary and Inner Tokyo Bay. Estuarine, Coastal and Shelf Science. 44(3), 263-273. doi:10.1006/ecss.1996.0118. [Abstract]

Books and Reviews

  • Ogawa, N.O., Sato, R., and Ohkouchi, N. (2006) Evaluation of precision and accuracy for carbon isotopic measurements of 13C-labeled samples by an on line elemental analyzer / isotope ratio mass spectrometer system. Frontier Research on Earth Evolution, Vol.2. [PDF]
  • Ohkouchi, N., Nakajima, Y., Ogawa, N.O., Suga, H., Kashiyama, Y., Matsumoto, K., Chikaraishi, Y., Oguri, K., and Kitazato, H. (2006) Stable carbon and nitrogen isotopic compositions of photosynthetic pigments as tracers for elemental cycle in the modern- and paleo-environments. Frontier Research on Earth Evolution, Vol.2. [PDF]
  • Ohkouchi, N., Yanagisawa, T., Kuroda, J., Yamagishi, Y., Hamano, Y., Tanimizu, M., Ogawa, N.O., Suganuma, Y., and Yoshihara, A. (2006) A status report of MUD “Global Event” group: A dynamic interaction between Earth’s interior and surface environments in the mid Cretaceous. Frontier Research on Earth Evolution, Vol.2. [PDF]
  • Wada, E., Tayasu, I., Koba, K., Matsubara, T., Ogawa, N.O., Yamada, Y., Yoshii, K., and Sugimoto, A. (1998) The use of stable isotopes for ecological studies. 407-430. In: Gopal, B., Pathak, P.S. and Saxena , K.G. [Eds.]. Ecology today: An anthology of contemporary ecological research. International Scientific Publishers. New Delhi.
  • Yoshii, K., Ogawa, N.O., Wada, E., Mekhanikova, I., Melnik, N.G., Timoshkin, O.A., Shubenkov, S.G., Smirnov, V.V., and Smirnova-Zalumi, N.S. (1997) 15N and 13C abundances in Lake Baikal: Difference between the littoral and pelagic food webs. In: N. Miyazaki. [Ed.]. Animal community, environment and phylogeny in Lake Baikal. pp107-113. Otsuchi Marine Research Center, Ocean Research Institute, The University of Tokyo.

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