• Kobayashi, K., Tanaka, M., Yatsukawa, Y., Tanabe, S., Tanaka, M., and Ohkouchi, N. (2018) Development of a method to isolate glutamic acid from foodstuffs for a precise determination of their stable carbon isotope ratio. Analytical Science, 34(5), 571-574. doi:10.2116/analsci.17P450. [Open Access]
  • Goto, A.S., Miura, K., Korenaga, T., Hasegawa, T., Ohkouchi, N., and Chikaraishi, Y. (2018) Fractionation of stable nitrogen isotopes (15N/14N) during enzymatic deamination of glutamic acid: Implications for mass and energy transfers in the biosphere. Geochemical Journal, 52. doi:10.2343/geochemj.2.0513. in press.
  • Itahashi, Y., Tsuneki, A., Dougherty, S.P., Chikaraishi, Y., Ohkouchi, N., and Yoneda, M. (2018) Dining together: Reconstruction of Neolithic food consumption based on the δ15N values for individual amino acids at Tell el-Kerkh, northern Levant. Journal of Archaeological Science: Reports, 17, 775-784. doi:10.1016/j.jasrep.2017.12.042. [Open Access]
  • Jiménez-Espejo, F.J., García-Alix, A., Harada, N., Bahr, A., Sakai, S., Iijima, K., Chang, Q., Sato, K., Suzuki, K., and Ohkouchi, N. (2018) Changes in detrital input, ventilation and productivity in the central Okhotsk Sea during the marine isotope stage 5e, penultimate interglacial period. Journal of Asian Earth Sciences, 156, 189-200. doi:10.1016/j.jseaes.2018.01.032. [Open Access]
  • Nunoura, T., Chikaraishi, Y., Izaki, R., Suwa, T., Sato, T., Harada, T., Mori, K., Kato, Y., Miyazaki, M., Shimamura, S., Yanagawa, K., Shuto, A., Ohkouchi, N., Fujita, N., Takaki, Y., Atomi, H., and Takai, K. (2018) A primordial and reversible TCA cycle in a facultatively chemolithoautotrophic thermophile. Science, 359(6375), 559-563. doi:10.1126/science.aao3407. [Open Access]
  • Yoshimura, T., Araoka, D., Tamenori, Y., Kuroda, J., Kawahata, H., and Ohkouchi, N. (2018) Lithium, magnesium and sulfur purification from seawater using an ion chromatograph with a fraction collector system for stable isotope measurements. Journal of Chromatography A, 1531, 157-162. doi:10.1016/j.chroma.2017.11.052. [Open Access]

  • 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]
  • Choi, B., Ha, S.-Y., Lee, J.S., Chikaraishi, Y., Ohkouchi, N., and Shin, K.-H. (2017) Trophic interaction among organisms in a seagrass meadow ecosystem as revealed by bulk δ13C and amino acid δ15N analyses. Limnology and Oceanography, 62(4), 1426-1435. doi:10.1002/lno.10508. [Open Access]
  • Drucker, D.G., Naito, Y.I., Péan, S., Prat, S., Crépin, L., Chikaraishi, Y., Ohkouchi, N., Puaud, S., Lázničková-Galetová, M., Patou-Mathis, M., Yanevich, A., and Bocherens, H. (2017) Isotopic analyses suggest mammoth and plant in the diet of the oldest anatomically modern humans from far southeast Europe. Scientific Reports, 7:6833. doi:10.1038/s41598-017-07065-3. [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. [Open Access]
  • 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.
  • Ishikawa, N.F., Chikaraishi, Y., Ohkouchi, N., Murakami, A.R., Tayasu, I., Togashi, H., Okano, J., Sakai, Y., Iwata, T., Kondoh, M., and Okuda, N. (2017) Integrated trophic position decreases in more diverse communities of stream food webs. Scientific Reports, 7:2130. doi:10.1038/s41598-017-02155-8. [Open Access]
  • Ishikawa, N.F., Hayashi, F., Sasaki, Y., Chikaraishi, Y., and Ohkouchi, N. (2017) Trophic discrimination factor of nitrogen isotopes within amino acids in the dobsonfly Protohermes grandis (Megaloptera: Corydalidae) larvae in a controlled feeding experiment. Ecology and Evolution, 7(6), 1674-1679. doi:10.1002/ece3.2728. [Open Access]
  • Itahashi, Y., Miyake, Y., Maeda, O., Kondo, O., Hongo, H., Van Neer, W., Chikaraishi, Y., Ohkouchi, N., and Yoneda, M. (2017) Preference for fish in a Neolithic hunter-gatherer community of the upper Tigris, elucidated by amino acid δ15N analysis. Journal of Archaeological Science, 82, 40-49. doi:10.1016/j.jas.2017.05.001.
  • Kinoshita, K., Takano, Y., Ohkouchi, N., and Deguchi, S. (2017) Free-radical polymerization of acrylic acid under extreme reaction conditions mimicking deep-sea hydrothermal vents. ACS Omega, 2(6), 2765-2769. doi:10.1021/acsomega.7b00293. [Open Access]
  • Naeher, S., and Ohkouchi, N. (2017) Pigmente - Indikatoren für Umweltveränderungen. Nachrichten aus der Chemie, 65(1), 16-20. doi:10.1002/nadc.20174056149. [Open Access]
  • 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. [Open Access]
  • Sakai, S., Matsuda, S., Hikida, T., Shimono, A., McManus, J.B., Zahniser, M., Nelson, D., Dettman, D.L., Yang, D., and Ohkouchi, N. (2017) High-precision simultaneous 18O/16O, 13C/12C, and 17O/16O analyses for microgram quantities of CaCO3 by tunable infrared laser absorption spectroscopy. Analytical Chemistry, 89(21), 11846-11852. doi:10.1021/acs.analchem.7b03582. [Open Access]
  • Steffan, S.A., Chikaraishi, Y., Dharampal, P.S., Pauli, J.N., Guédot, C., and Ohkouchi, N. (2017) Unpacking brown food-webs: Animal trophic identity reflects rampant microbivory. Ecology and Evolution, 7(10), 3532-3541. doi:10.1002/ece3.2951. [Open Access]
  • 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]
  • Takishita, K., Chikaraishi, Y., Tanifuji, G., Ohkouchi, N., Hashimoto, T., Fujikura, K., and Roger, A.J. (2017) Microbial eukaryotes that lack sterols. Journal of Eukaryotic Microbiology, 64(6), 897-900. doi:10.1111/jeu.12426. [Open Access]
  • Takishita, K., Takaki, Y., Chikaraishi, Y., Ikuta, T., Ozawa, G., Yoshida, T., Ohkouchi, N., and Fujikura, K. (2017) Genomic evidence that methanotrophic endosymbionts likely provide deep-sea Bathymodiolus mussels with a sterol intermediate in cholesterol biosynthesis. Genome Biology and Evolution, 9(5), 1148-1160. doi:10.1093/gbe/evx082. [Open Access]
  • Takizawa, Y., Dharampal, P.S., Steffan, S.A., Takano, Y., Ohkouchi, N., and Chikaraishi, Y. (2017) Intra-trophic isotopic discrimination of 15N/14N for amino acids in autotrophs: Implications for nitrogen dynamics in ecological studies. Ecology and Evolution, 7(9), 2916-2924. doi:10.1002/ece3.2866. [Open Access]
  • Williams, B., Thibodeau, B., Chikaraishi, Y., Ohkouchi, N., Walnum, A., Grottoli, A.G., and Colin, P.L. (2017) Consistency in coral skeletal amino acid composition offshore of Palau in the western Pacific warm pool indicates no impact of decadal variability in nitricline depth on primary productivity. Limnology and Oceanography, 62(2), 399-407. doi:10.1002/lno.10364. [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. [Open Access]
  • Yoshimura, T., Tamenori, Y., Suzuki, A., Kawahata, H., Iwasaki, N., Hasegawa, H., Nguyen, L.T., Kuroyanagi, A., Yamazaki, T., Kuroda, J., and Ohkouchi, N. (2017) Altervalent substitution of sodium for calcium in biogenic calcite and aragonite. Geochimica et Cosmochimica Acta, 202, 21-38. doi:10.1016/j.gca.2016.12.003. [Open Access]
  • 大河内 直彦 (2017) 化合物レベル放射性炭素年代法. 地球化学 (Geochemistry), 51(3), 135-152. doi:10.14934/chikyukagaku.51.135. (in Japanese with English abstract)

  • 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. [Open Access]
  • 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]
  • Kruger, B.R., Werne, J.P., Branstrator, D.K., Hrabik, T.R., Chikaraishi, Y., Ohkouchi, N., and Minor, E.C. (2016) Organic matter transfer in Lake Superior's food web: Insights from bulk and molecular stable isotope and radiocarbon analyses. Limnology and Oceanography, 61(1), 149-164. doi:10.1002/lno.10205. [Open Access]
  • Kuroda, J., Jiménez-Espejo, F.J., Nozaki, T., Gennari, R., Lugli, S., Manzi, V., Roveri, M., Flecker, R., Sierro, F.J., Yoshimura, T., Suzuki, K., and Ohkouchi, N. (2016) Miocene to Pleistocene osmium isotopic records of the Mediterranean sediments. Paleoceanography, 31(1), 148-166. doi:10.1002/2015PA002853. [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. [Open Access]
  • 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. [Open Access]
  • Naito, Y.I., Bocherens, H., Chikaraishi, Y., Drucker, D.G., Wißing, C., Yoneda, M., and Ohkouchi, N. (2016) An overview of methods used for the detection of aquatic resource consumption by humans: Compound-specific delta N-15 analysis of amino acids in archaeological materials. Journal of Archaeological Science: Reports, 6, 720-732. doi:10.1016/j.jasrep.2015.11.025.
  • Naito, Y.I., Chikaraishi, Y., Drucker, D.G., Ohkouchi, N., Semal, P., Wißing, C., and Bocherens, H. (2016) Ecological niche of Neanderthals from Spy Cave revealed by nitrogen isotopes of individual amino acids in collagen. Journal of Human Evolution, 93, 82-90. doi:10.1016/j.jhevol.2016.01.009.
  • Naito, Y.I., Germonpré, M., Chikaraishi, Y., Ohkouchi, N., Drucker, D.G., Hobson, K.A., Edwards, M.A., Wißing, C., and Bocherens, H. (2016) Evidence for herbivorous cave bears (Ursus spelaeus) in Goyet Cave, Belgium: Implications for paleodietary reconstruction of fossil bears using amino acid δ15N approaches. Journal of Quaternary Science, 31(6), 598-606. doi:10.1002/jqs.2883.
  • 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. [Open Access]
  • van Soelen, E.E., Ohkouchi, N., Suga, H., Sinninghe Damsté, J.S., and Reichart, G.-J. (2016) A late Holocene molecular hydrogen isotope record of the East Asian Summer Monsoon in Southwest Japan. Quaternary Research, 86(3), 287-294. doi:10.1016/j.yqres.2016.07.005.
  • Yokoyama, Y., Anderson, J.B., Yamane, M., Simkins, L.M., Miyairi, Y., Yamazaki, T., Koizumi, M., Suga, H., Kusahara, K., Prothro, L., Hasumi, H., Southon, J.R., and Ohkouchi, N. (2016) Widespread collapse of the Ross Ice Shelf during the late Holocene. Proceedings of the National Academy of Sciences of the United States of America, 113(9), 2354-2359. doi:10.1073/pnas.1516908113. [Open Access]
  • 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. [Open Access]
  • 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]
  • 高野 淑識, 力石 嘉人, 大河内 直彦 (2016) アミノ酸(ピバロイル/ イソブチルエステル誘導体)のGC/MS による解析 [技術論文]. Researches in Organic Geochemistry, 32(1), 1-18. (in Japanese with English abstract) [Open Access]
  • 藤倉 克則, 藤原 義弘, 高橋 幸愛, 大河内 直彦, 北里 洋 (2016) 震災がもたらした瓦礫の動向について. 日本水産学会誌, 82(2), p.136. [Open Access]

  • Chikaraishi, Y., Steffan, S.A., Takano, Y., and Ohkouchi, N. (2015) Diet quality influences isotopic discrimination among amino acids in an aquatic vertebrate. Ecology and Evolution, 5(10), 2048-2059. doi:10.1002/ece3.1491. [Open Access]
  • Inagaki, F., Hinrichs, K.-U., Kubo, Y., Bowles, M.W., Heuer, V.B., Hong, W.-L., Hoshino, T., Ijiri, A., Imachi, H., Ito, M., Kaneko, M., Lever, M.A., Lin, Y.-S., Methé, B.A., Morita, S., Morono, Y., Tanikawa, W., Bihan, M., Bowden, S.A., Elvert, M., Glombitza, C., Gross, D., Harrington, G.J., Hori, T., Li, K., Limmer, D., Liu, C.-H., Murayama, M., Ohkouchi, N., Ono, S., Park, Y.-S., Phillips, S.C., Prieto-Mollar, X., Purkey, M., Riedinger, N., Sanada, Y., Sauvage, J., Snyder, G., Susilawati, R., Takano, Y., Tasumi, E., Terada, T., Tomaru, H., Trembath-Reichert, E., Wang, D.T., and Yamada, Y. (2015) Exploring deep microbial life in coal-bearing sediment down to ~2.5 km below the ocean floor. Science, 349(6246), 420-424. doi:10.1126/science.aaa6882. [Open Access]
  • Isaji, Y., Kawahata, H., Ohkouchi, N., Murayama, M., and Tamaki, K. (2015) Terrestrial environmental changes around the Gulf of Aden over the last 210 kyr deduced from the sediment n-alkane record: Implications for the dispersal of Homo sapiens. Geophysical Research Letters, 42(6), 1880-1887. doi:10.1002/2015GL063196. [Open Access]
  • 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., Tayasu, I., Yamane, M., Yokoyama, Y., Sakai, S., and Ohkouchi, N. (2015) Sources of dissolved inorganic carbon in two small streams with different bedrock geology: insights from carbon isotopes. Radiocarbon, 57(3), 439-448. doi:10.2458/azu_rc.57.18348. [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]
  • 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).
  • Kusuno, H., Matsuzaki, H., Nagata,T., Miyairi, Y., Yokoyama, Y., and Ohkouchi, N. (2015) An approach for measuring the 129I/127I ratio in fish samples. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 361, 414-418. doi:10.1016/j.nimb.2015.04.074.
  • 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. [Open Access]
  • Monge, G., Jiménez-Espejo, F.J., García- Alix, A., Martínez-Ruiz, F., Mattielli, N., Finlayson, C., Ohkouchi, N., Sánchez, M.C., Bermúdez de Castro, J.M., Blasco, R., Rosell, J., Carrión, J., Rodríguez-Vidal, J., and Finlayson, G. (2015) Earliest evidence of pollution by heavy metals in archaeological sites. Scientific Reports, 5:14252. doi:10.1038/srep14252. [Open Access]
  • Nomaki, H., Chikaraishi, Y., Tsuchiya, M., Toyofuku, T., Suga, H., Sasaki, Y., Uematsu, K., Tame, A., and Ohkouchi, N. (2015) Variation in the nitrogen isotopic composition of amino acids in benthic foraminifera: Implications for their adaptation to oxygen-depleted environments. Limnology and Oceanography, 60(6), 1906-1916. doi:10.1002/lno.10140. [Open Access]
  • Ohkouchi, N., Kuroda, J., and Taira, A. (2015) The origin of Cretaceous black shales: a change in the surface ocean ecosystem and its triggers. Proceedings of the Japan Academy, Series B, 91(7), 273-291. doi:10.2183/pjab.91.273. [Open Access]
  • 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
  • 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.
  • Steffan, S.A., Chikaraishi, Y., Currie, C.R., Horn, H., Gaines-Day, H.R., Pauli, J.N., Zalapa, J.E., and Ohkouchi, N. (2015) Microbes are trophic analogs of animals. Proceedings of the National Academy of Sciences of the United States of America, 112(49), 15119-15124. doi:10.1073/pnas.1508782112. [Open Access]
  • Steffan, S.A., Chikaraishi, Y., Horton, D.R., Miliczky, E., Zalapa, J.E., Jones, V.P., and Ohkouchi, N. (2015) Beneficial or not? Decoding carnivore roles in plant protection. Biological Control, 91, 34-41. doi:10.1016/j.biocontrol.2015.07.002.
  • Takano, Y., Chikaraishi, Y., and Ohkouchi, N. (2015) Isolation of underivatized amino acids by ion-pair high performance liquid chromatography for precise measurement of nitrogen isotopic composition of amino acids: Development of comprehensive LC x GC/C/IRMS method. International Journal of Mass Spectrometry, 379, 16-25. doi:10.1016/j.ijms.2014.11.012. [Open Access]
  • 高野 淑識, 力石 嘉人, 大河内 直彦 (2015) イオンペアクロマトグラフィー/電子スプレーイオン化質量分析法 (LC/ESI-MS)によるアミノ酸のマススペクトル解析 [技術論文]. Researches in Organic Geochemistry, 31(1), 33-49. (in Japanese with English abstract) [Open Access]
  • 高野 淑識, 大河内 直彦 (2015) マントルゼノリスの炭素と窒素の起源について [依頼総説]. 地学雑誌 (Journal of Geography), 124(3), 503-514. doi:10.5026/jgeography.124.503. (in Japanese with English abstract) [Open Access]
  • 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. (2015) 安定同位体分析による北西太平洋におけるカタクチイワシとマイワシの栄養段階と食源の推定. 日本生物地理学会会報, 70, 33-41.

  • 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]
  • Itahashi, Y., Chikaraishi, Y., Ohkouchi, N., and Yoneda, M. (2014) Refinement of reconstructed ancient food webs based on the nitrogen isotopic compositions of amino acids from bone collagen: A case study of archaeological herbivores from Tell Ain el-Kerkh, Syria. Geochemical Journal, 48(4), e15-e19. doi:10.2343/geochemj.2.0318. [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]
  • Maki, K., Ohkouchi, N., Chikaraishi, Y., Fukuda, H., Miyajima, T., and Nagata, T. (2014) Influences of nitrogen substrates and substrate C:N ratios on the nitrogen isotopic composition of amino acids from the marine bacterium Vibrio harveyi. Geochimica et Cosmochimica Acta, 140, 521-530. doi:10.1016/j.gca.2014.05.052. [Open Access]
  • Nakayama, T., Kamikawa, R., Tanifuji, G., Kashiyama, Y., Ohkouchi, N., Archibald, J.M., and Inagaki, Y. (2014) Complete genome of a nonphotosynthetic cyanobacterium in a diatom reveals recent adaptations to an intracellular lifestyle. Proceedings of the National Academy of Sciences of the United States of America, 111(31), 11407-11412. doi:10.1073/pnas.1405222111. [Open Access]
  • Nomaki, H., Chikaraishi, Y., Tsuchiya, M., Toyofuku, T., Ohkouchi, N., Uematsu, K., Tame, A., and Kitazato, H. (2014) Nitrate uptake by foraminifera and use in conjunction with endobionts under anoxic conditions. Limnology and Oceanography, 59(6), 1879-1888. doi:10.4319/lo.2014.59.6.1879. [Open Access]
  • Ohkouchi, N., and Takano, Y. (2014) Organic nitrogen: sources, fates, and chemistry. Treatise on Geochemistry, Vol. 12, 10: Organic Geochemistry (Edited by Birrer, B., Falkowski, P., Freeman, K.), Elsevier, pp. 251-289. doi:10.1016/B978-0-08-095975-7.01015-9. [Open Access]
  • Yamane, M., Yokoyama, Y., Miyairi, Y., Suga, H., Matsuzaki, H., Dunbar, R.B., and Ohkouchi, N. (2014) Compound-Specific 14C dating of IODP Expedition 318 core U1357A obtained off the Wilkes Land coast, Antarctica. Radiocarbon, 56(3), 1009-1017. doi:10.2458/56.17773. [Open Access]

  • 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. [Open Access]
  • Kaneko, M., Naraoka, H., Takano, Y., and Ohkouchi, N. (2013) Distribution and isotopic signatures of archaeal lipid biomarkers associated with gas hydrate occurrences on the northern Cascadia Margin. Chemical Geology, 343, 76-84. doi:10.1016/j.chemgeo.2013.02.003. [Open Access]
  • 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. [Open Access]
  • Naito, Y.I., Chikaraishi, Y., Ohkouchi, N., Drucker, D.G., and Bocherens, H. (2013) Nitrogen isotopic composition of collagen amino acids as an indicator of aquatic resource consumption: insights from Mesolithic and Epipalaeolithic archaeological sites in France. World Archaeology, 45(3), 338-359. doi:10.1080/00438243.2013.820650.
  • Naito, Y.I., Chikaraishi, Y., Ohkouchi, N., and Yoneda, M. (2013) Evaluation of carnivory in inland Jomon hunter-gatherers based on nitrogen isotopic compositions of individual amino acids in bone collagen. Journal of Archaeological Science, 40(7), 2913-2923. doi:10.1016/j.jas.2013.03.012.
  • 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. [Open Access]
  • Ohkouchi, N., Tsuda, R., Chikaraishi, Y., and Tanabe, K. (2013) A preliminary estimate of the trophic position of the deep-water ram’s horn squid Spirula spirula based on the nitrogen isotopic composition of amino acids. Marine Biology, 160(4), 773-779. doi:10.1007/s00227-012-2132-1. [Open Access]
  • Schouten, S., Hopmans, E.C., Rosell-Melé, A., Pearson, A., Adam, P., Bauersachs, T., Bard, E., Bernasconi, S.M., Bianchi, T.S., Brocks, J.J., Carlson, L.T., Castañeda, I.S., Derenne, S., Selver, A.D., Dutta, K., Eglinton, T., Fosse, C., Galy, V., Grice, K., Hinrichs, K.-U., Huang, Y., Huguet, A., Huguet, C., Hurley, S., Ingalls, A., Jia, G., Keely, B., Knappy, C., Kondo, M., Krishnan, S., Lincoln, S., Lipp, J., Mangelsdorf, K., Martínez-García, A., Ménot, G., Mets, A., Mollenhauer, G., Ohkouchi, N., Ossebaar, J., Pagani, M., Pancost, R.D., Pearson, E.J., Peterse, F., Reichart, G.-J., Schaeffer, P., Schmitt, G., Schwark, L., Shah, S.R., Smith, R.W., Smittenberg, R.H., Summons, R.E., Takano, Y., Talbot, H.M., Taylor, K.W.R., Tarozo, R., Uchida, M., van Dongen, B.E., Van Mooy, B.A.S., Wang, J., Warren, C., Weijers, J.W.H., Werne, J.P., Woltering, M., Xie, S., Yamamoto, M., Yang, H., Zhang, C.L., Zhang, Y., Zhao, M., and Sinninghe Damsté, J.S. (2013) An interlaboratory study of TEX86 and BIT analysis of sediments, extracts and standard mixtures. Geochemistry, Geophysics, Geosystems, 14(12), 5263-5285. doi:10.1002/2013GC004904. [Open Access]
  • Steffan, S.A., Chikaraishi, Y., Horton, D.R., Ohkouchi, N., Singleton, M.E., Miliczky, E., Hogg, D.B., and Jones, V.P. (2013) Trophic hierarchies illuminated via amino acid isotopic analysis. PLoS ONE, 8(9): e76152. doi:10.1371/journal.pone.0076152. [Open Access]
  • Takano, Y., Kaneko, M., Kahnt, J., Imachi, H., Shima, S., and Ohkouchi, N. (2013) Detection of coenzyme F430 in deep sea sediments: A key molecule for biological methanogenesis. Organic Geochemistry, 58, 137-140. doi:10.1016/j.orggeochem.2013.01.012. [Open Access]

  • Chikaraishi Y., Kaneko, M., and Ohkouchi N. (2012) Stable hydrogen and carbon isotopic compositions of long-chain (C21-C33) n-alkanes and n-alkenes in insects. Geochimica et Cosmochimica Acta, 95, 53-62. doi:10.1016/j.gca.2012.07.036. [Open Access]
  • 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. [Open Access]
  • 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]
  • Takishita, K., Chikaraishi, Y., Leger, M.M., Kim, E., Yabuki, A., Ohkouchi, N., and Roger, A.J. (2012) Lateral transfer of tetrahymanol-synthesizing genes has allowed multiple diverse eukaryote lineages to independently adapt to environments without oxygen. Biology Direct, 7(5). doi:10.1186/1745-6150-7-5. [Open Access]
  • 高野 淑識, 力石 嘉人, 大河内 直彦 (2012) 分子内同位体比で観る海底下のアーキアの生態:エーテル脂質分子内のサルベージ経路と新生経路を例にして. 地球化学 (Geochemistry), 46(2), 113-128. (in Japanese with English abstract) [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]
  • Kohzu, A., Imai, A., Ohkouchi, N., Fukushima, T., Kamiya, K., Komatsu, K., Tomioka, N., Kawasaki, N., Miura, S., and Satou, T. (2011) Direct evidence for the alteration of 13C natural abundances during early diagenesis in Lake Kasumigaura, Japan. Geochemistry, Geophysics, Geosystems, 12(10). doi:10.1029/2011GC003532. [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. [Open Access]
  • 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]
  • Strable M.S., Tschanz, C.L., Varamini, B., Chikaraishi, Y., Ohkouchi, N., and Brenna, J.T. (2011) Mammalian DNA δ15N exhibits 40‰ intramolecular variation and is unresponsive to dietary protein level. Rapid Communications in Mass Spectrometry, 25(23), 3555-3562. doi:10.1002/rcm.5263. [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. [Open Access]
  • 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]
  • Zhou, Y., Grice, K., Chikaraishi, Y., Stuart-Williams, H., Farquhar, G.D., and Ohkouchi, N. (2011) Temperature effect on leaf water deuterium enrichment and isotopic fractionation during leaf lipid biosynthesis: Results from controlled growth of C3 and C4 land plants. Phytochemistry, 72, 207-213. doi:10.1016/j.phytochem.2010.10.022.
  • 力石 嘉人, 高野 淑識, 小川 奈々子, 佐々木 瑶子, 土屋 正史, 大河内 直彦 (2011) アミノ酸の窒素同位体比を用いた生物の栄養段階の解析:陸上環境を含めた生物生態系の解明に向けて. Researches in Organic Geochemistry, 27, 3-11. (in Japanese with English abstract) [Open Access]

  • Chikaraishi, Y., Ogawa, N.O., and Ohkouchi, N. (2010) Further evaluation of the trophic level estimation based on nitrogen isotopic composition of amino acids. in: Earth, Life, and Isotopes (Eds. Ohkouchi N, Tayasu I, Koba K), Kyoto University Press, pp.37-51.
  • Chikaraishi, Y., and Ohkouchi, N. (2010) An improved method for precise determination of carbon isotopic composition of amino acids. in: Earth, Life, and Isotopes (Eds. Ohkouchi N, Tayasu I, Koba K), Kyoto University Press, pp.355-366.
  • 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. Ohkouchi N, Tayasu I, Koba K), Kyoto University Press, pp.367-386.
  • 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.
  • 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. Ohkouchi N, Tayasu I, Koba K), Kyoto University Press, pp.313-335.
  • Kuroda, J., Hori, R.S., Suzuki, K., Gröcke, D.R., and Ohkouchi, N. (2010) Marine osmium isotope record across the Triassic-Jurassic boundary from a Pacific pelagic site. Geology, 38(12), 1095-1098. doi:10.1130/G31223.1. [Open Access]
  • 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]
  • Naito, Y.I., Chikaraishi, Y., Ohkouchi, N., Mukai, H., Shibata, Y., Honch, N.V., Dodo, Y., Ishida, H., Amano, T., Ono, H., and Yoneda, M. (2010) Dietary reconstruction of the Okhotsk Culture of Hokkaido, Japan, based on nitrogen composition of amino acids: implication for correction of 14C marine reservoir effects on human bones. Radiocarbon, 52(2), 671-681. doi:10.1017/S0033822200045690. [Open Access]
  • Naito, Y.I., Honch, N.V., Chikaraishi, Y., Ohkouchi, N., and Yoneda, M. (2010) Quantitative evaluation of marine protein contribution in ancient diets based on nitrogen isotope ratios of individual amino acids in bone collagen: An investigation at the Kitakogane Jomon site. American Journal of Physical Anthropology, 143(1), 31-40. doi:10.1002/ajpa.21287.
  • 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. Ohkouchi N, Tayasu I, Koba K), 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. Ohkouchi N, Tayasu I, Koba K), Kyoto University Press, pp.339-353.
  • 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. Ohkouchi N, Tayasu I, Koba K), 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. [Open Access]
  • Takano, Y., Chikaraishi, Y., and Ohkouchi, N. (2010) Enantiomer-specific isotope analysis of D- and L-alanine: Nitrogen isotopic hetero- and homogeneity in microbial and chemical processes. in: Earth, Life, and Isotopes (Eds. Ohkouchi N, Tayasu I, Koba K), Kyoto University Press, pp.387-402.
  • 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. [Open Access]
  • Yokoyama, Y., Koizumi, M., Matsuzaki, H., Miyairi, Y., and Ohkouchi, N. (2010) Developing ultra small-scale radiocarbon sample measurement at the University of Tokyo. Radiocarbon. 52(2), 310-318. [Open Access]
  • 黒田 潤一郎, 鈴木 勝彦, 大河内 直彦 (2010) 白亜紀における大規模火山活動と地球環境変動のリンク. 地学雑誌 (Journal of Geography), 119(3), 534-555. [Open Access]
  • 高野 淑識, 大河内 直彦 (2010) 海底下の生物圏:過去と現世のリンクを担う生物地球化学プロセス. 地球化学 (Geochemistry), 44(4), 185-204. (in Japanese with English abstract) [Open Access]
  • 高野 淑識, 大河内 直彦 (2010) 有機分子で探る母天体の物質進化:特に水質変成と分子非対称性の共進化. 日本惑星科学会誌, 19(4), 254-267. [Open Access]
  • 高野 淑識, 力石 嘉人, 大河内 直彦 (2010) 微量湿式分析による分子レベル同位体比の品質管理と確度向上:特に天然存在比の正確な評価とStable Isotope Probing (SIP) 法の応用に向けて. Researches in Organic Geochemistry, 26, 81-93. (in Japanese with English abstract) [Open Access]
  • 力石 嘉人, 小川 奈々子, 高野 淑識, 土屋 正史, 大河内 直彦 (2010) アミノ酸の窒素同位体比を用いた水棲生物の栄養段階の解析. 地球化学 (Geochemistry), 44(4), 233-241. (in Japanese with English abstract) [Open Access]
  • 坪井 美里, 中村 栄子, 間嶋 隆一, 北里 洋, 菅 寿美, 力石 嘉人, 加藤 和浩, 和田 秀樹, 大河内 直彦, 佐藤 蓉子, 浜名 徳明 (2010) 分子化石による過去の湧水活動の復元:更新統小柴層と大船層の例. 化石, 87, 5-21. [Open Access]
  • 内藤 裕一, 山口 保彦, 力石 嘉人, 大河内 直彦 (2010) 不飽和脂肪酸の極性カラムを用いたGC/MS解析. Researches in Organic Geochemistry, 26, 139-145. [Open Access]

  • Bassez, M.-P., Takano, Y., and Ohkouchi, N. (2009) Organic analysis of peridotite rocks from the Ashadze and Logatchev hydrothermal sites. International Journal of Molecular Sciences, 10(7), 2986-2998. doi:10.3390/ijms10072986. [Open Access]
  • 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]
  • Chikaraishi, Y., Tanaka, R., Tanaka, A., and Ohkouchi, N. (2009) Fractionation of hydrogen isotopes during phytol biosynthesis. Organic Geochemistry, 40(5), 569-573. doi:10.1016/j.orggeochem.2009.02.007. [Open Access]
  • 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. [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]
  • Tejada, M.L.G., Suzuki, K., Kuroda, J., Coccioni, R., Mahoney, J.J., Ohkouchi, N., Sakamoto, T., and Tatsumi, Y. (2009) Ontong Java Plateau eruption as a trigger for the early Aptian oceanic anoxic event. Geology, 37(9), 855-858. doi:10.1130/G25763A.1. [Open Access]
  • 大河内 直彦 (2009) 化合物レベル放射性炭素年代法の原理と南極縁辺海堆積物への応用. 第四紀研究, 48(3), 131-142. [Open Access]
  • 力石 嘉人, 高野 淑識, 大河内 直彦 (2009) アミノ酸 (ピバロイル/イソプロピルエステル誘導体) のGC/MSによる解析. Researches in Organic Geochemistry, 25, 61-70. [Open Access]
  • 山口 保彦, 力石 嘉人, 横山 祐典, 大河内 直彦 (2009) アミノ酸 (エトキシカルボニル/エチルエステル誘導体) のGC/MSによる解析. Researches in Organic Geochemistry, 25, 71-83. [Open Access]

  • 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. [Open Access]
  • Jenkins, R.G., Hikida, Y., Chikaraishi, Y., Ohkouchi, N., and Tanabe, K. (2008) Microbially induced formation of ooid-like coated grains in the Late Cretaceous methane-seep deposits of the Nakagawa area, Hokkaido, northern Japan. Island Arc, 17(2), 261-269. doi:10.1111/j.1440-1738.2008.00616.x. [Open Access]
  • 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. [Open Access]
  • 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. [Open Access]
  • 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]
  • Neal, C.R., Coffin, M.F., Arndt, N.T., Duncan, R.A., Eldholm, O., Erba, E., Farnetani, C., Fitton, J.F., Ingle, S.P., Ohkouchi, N., Rampino, M.R., Reichow, M.K., Self, S., and Tatsumi, Y. (2008) Investigatin large igneous province formation and associated paleoenvironmental events: A white paper for scientific drilling. Scientific Drilling, 6, 4-18. doi:10.2204/iodp.sd.6.01.2008. [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., and Eglinton, T.I. (2008) Compound-specific radiocarbon dating of Ross Sea sediments: A prospect for constructing chronologies in high-latitude oceanic sediments. Quaternary Geochronology, 3(3), 235-243. doi:10.1016/j.quageo.2007.11.001.
  • 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. [Open Access]
  • Shah, S.R., Mollenhauer, G., Ohkouchi, N., Eglinton, T.I., and Pearson, A. (2008) Origins of archaeal tetraether lipids in sediments: Insights from radiocarbon analysis. Geochimica et Cosmochimica Acta, 72(18), 4577-4594. doi:10.1016/j.gca.2008.06.021. [Open Access]
  • 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.

  • 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]
  • Chikaraishi, Y., Matsumoto, K., Kitazato, H., and Ohkouchi, N. (2007) Sources and transformation processes of pheopigments: Stable carbon and hydrogen isotopic evidence from Lake Haruna, Japan. Organic Geochemistry, 38(6), 985-1001. doi:10.1016/j.orggeochem.2007.01.005. [Open Access]
  • Kashiyama, Y., Kitazato, H., and Ohkouchi, N. (2007) An improved method for isolation and purification of sedimentary porphyrins by high-performance liquid chromatography for compound-specific isotopic analysis. Journal of Chromatography A, 1138(1-2), 73-83. doi:10.1016/j.chroma.2006.10.028.
  • Kashiyama, Y., Shiro, M., Tada, R., and Ohkouchi, N. (2007) A novel vanadyl alkylporphyrins from geological samples: A possible derivative of divinylchlorophylls or bacteriochlorophyll a? Chemistry Letters, 36(6), 706-707.
  • 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. [Open Access]
  • 力石 嘉人, 柏山 祐一郎, 大河内 直彦 (2007) 藻類・植物・堆積物に含まれるクロロ色素・フェオ色素のHPLC/MSによる解析. Researches in Organic Geochemistry, 22, 43-55. [Open Access]
  • 能美 仁博, 横山 祐典, 三浦 英樹, 大河内 直彦 (2007) 深海底堆積物の解析による最終氷期以降の南極半島周辺氷床の消長. 第四紀研究, 46(2), 103-117. [Open Access]

  • Kameo, K., Okada, M., El-Masry, M., Hisamitsu, T., Saito, S., Nakazato, H., Ohkouchi, N., Ikehara, M., Yasuda, H., Kitazato, H., and Taira, A. (2006) Age model, physical properties and paleoceanographic implications of the middle Pleistocene core sediments in the Choshi area, central Japan. Island Arc, 15(3), 366-377. doi:10.1111/j.1440-1738.2006.00535.x. [Open Access]
  • Kuroda, J., and Ohkouchi, N. (2006) Implications of spatiotemporal distribution of black shales deposited during the Cretaceous Oceanic Anoxic Event-2. Paleontological Research, 10(4), 345-358. doi:10.2517/prpsj.10.345. [Open Access]
  • 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., and Eglinton, T.I. (2006) Radiocarbon constraint on relict organic carbon contributions to Ross Sea sediments. Geochemistry, Geophysics, Geosystems, 7(4), Q04012. doi:10.1029/2005GC001097. [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. [Open Access]

  • 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.
  • Kuroda, J., Ohkouchi, N., Ishii, T., Tokuyama, H., and Taira, A. (2005) Lamina-scale analysis of sedimentary components in Cretaceous black shales by chemical compositional mapping: Implications for paleoenvironmental changes during the Oceanic Anoxic Events. Geochimica et Cosmochimica Acta, 69(6), 1479-1494. doi:10.1016/j.gca.2004.06.039. [Open Access]
  • Ohkouchi, N., Eglinton, T.I., Hughen, K.A., Roosen, E., and Keigwin, L.D. (2005) Radiocarbon dating of alkenones from marine sediments: III. Influence of solvent extraction procedures on 14C measurements of foraminifera. Radiocarbon, 47(3), 425-432. [Open Access]
  • Ohkouchi, N., Nakajima, Y., Okada, H., and Kitazato, H. (2005) Copper-chelated bacteriochlorophyll e homologues in sediment from an anoxic lake (Lake Abashiri, Japan). Organic Geochemistry, 36(11), 1576-1580. doi:10.1016/j.orggeochem.2005.08.003. [Open Access]
  • 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. [Open Access]
  • Ohkouchi, N., Xu, L., Reddy, C.M., Montluçon, D., and Eglinton, T.I. (2005) Radiocarbon dating of alkenones from marine sediments: I. Isolation protocol. Radiocarbon, 47(3), 401-412. [Open Access]

  • 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. [Open Access]

  • Johnson, C.G., Frysinger, G.S., Nelson, R.K., Gaines, R.B., Ohkouchi, N., Reddy, C.M., and Eglinton, T.I. (2003) Innovative methods for determining alkenone unsaturation indices. Marine Chemistry, 83(1-2), 5-22. doi:10.1016/S0304-4203(03)00092-6. [Open Access]
  • Mollenhauer, G., Eglinton, T.I., Ohkouchi, N., Schneider, R.R., Müller, P.J., Grootes, P.M., and Rullkötter, J. (2003) Asynchronous alkenone and foraminifera records from the Benguela Upwelling System. Geochimica et Cosmochimica Acta, 67(12), 2157-2171. doi:10.1016/S0016-7037(03)00168-6. [Open Access]
  • Nakajima, Y., Okada, H., Oguri, K., Suga, H., Kitazato, H., Koizumi, Y., Fukui, M., and Ohkouchi, N. (2003) Distribution of chloropigments in suspended particulate matter and benthic microbial mat of a meromictic lake, Lake Kaiike, Japan. Environmental Microbiology, 5(11), 1103-1110. doi:10.1046/j.1462-2920.2003.00517.x. [Open Access]
  • Ohkouchi, N., Eglinton, T.I., and Hayes, J.M. (2003) Radiocarbon dating of individual fatty acids as a tool for refining Antarctic margin sediment chronologies. Radiocarbon, 45(1), 17-24. [Open Access]
  • 大河内 直彦 (2003) 化石分子とその同位体組成からみた白亜紀黒色頁岩の成因. 化石, 74, 48-56. [Open Access]

  • Ohkouchi, N., Eglinton, T.I., Keigwin, L.D., and Hayes, J.M. (2002) Spatial and temporal offsets between proxy records in a sediment drift. Science, 298(5596), 1224-1227. doi:10.1126/science.1075287. [Open Access]
  • Pagani, M., Freeman, K.H., Ohkouchi, N., and Caldeira, K. (2002) Comparison of water column [CO2aq] with sedimentary alkenone-based estimates: A test of the alkenone-CO2 proxy. Paleoceanography, 17(4), PA000756. doi:10.1029/2002PA000756. [Open Access]

  • 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]
  • Rosell-Melé, A., Bard, E., Emeis, K.-C., Grimalt, J.O., Müller, P., Schneider, R., Bouloubassi, I., Epstein, B., Fahl, K., Fluegge, A., Freeman, K., Goñi, M., Güntner, U., Hartz, D., Hellebust, S., Herbert, T., Ikehara, M., Ishiwatari, R., Kawamura, K., Kenig, F., de Leeuw, J., Lehman, S., Mejanelle, L., Ohkouchi, N., Pancost, R.D., Pelejero, C., Prahl, F., Quinn, J., Rontani, J.-F., Rostek, F., Rullkötter, J., Sachs, J., Blanz, T., Sawada, K., Schults-Bull, D., Sikes, E., Sonzogni, C., Ternois, Y., Versteegh, G., Volkman, J.K., and Wakeham, S. (2001) Precision of the current methods to measure the alkenone proxy U37K' and absolute alkenone abundance in sediments: Results of an interlaboratory comparison study. Geochemistry, Geophysics, Geosystems, 2(7), Paper number 2000GC000141. doi:10.1029/2000GC000141. [Open Access]
  • Ternois, Y., Kawamura, K., Keigwin, L., Ohkouchi, N., and Nakatsuka, T. (2001) A biomarker approach for assessing marine and terrigenous inputs to the sediments of Sea of Okhotsk for the last 27,000 years. Geochimica et Cosmochimica Acta, 65(5), 791-802. doi:10.1016/S0016-7037(00)00598-6. [Open Access]
  • 池原 実, 竹本 紀之, 大河内 直彦, 河村 公隆 (2001) 南大洋の表層堆積物における多環芳香族炭化水素の緯度分布. 地球化学 (Geochemistry), 35(2), 73-84. [Open Access]

  • Ikehara, M., Kawamura, K., Ohkouchi, N., Murayama, M., Nakamura, T., and Taira, A. (2000) Variations of terrestrial input and marine productivity in the Southern Ocean (48°S) during the last two deglaciations. Paleoceanography, 15(2), 170-180. doi:10.1029/1999PA000425. [Open Access]
  • Ohkouchi, N., Kawamura, K., Takemoto, N., Ikehara, M., and Nakatsuka, T. (2000) Implications of carbon isotope ratios of C27-C33 alkanes and C37 alkenes for the sources of organic matter in the southern ocean surface sediments. Geophysical Research Letters, 27(2), 233-236. doi:10.1029/1999GL002351. [Open Access]
  • Prahl, F., Herbert, T., Brassell, S.C., Ohkouchi, N., Pagani, M., Repeta, D., Rosell-Melé, A., and Sikes, E. (2000) Status of alkenone paleothermometer calibration: Report from Working group 3. Geochemistry, Geophysics, Geosystems, 1(11), Paper number 2000GC000058. doi:10.1029/2000GC000058. [Open Access]
  • Ternois, Y., Kawamura, K., Ohkouchi, N., and Keigwin, L. (2000) Alkenone sea surface temperature in the Okhotsk Sea for the last 15 kyr. Geochemical Journal, 34(4), 283-293. [Open Access]
  • 河村 公隆, 加治 貴, 大河内 直彦, 中塚 武, 池原 実 (2000) 北部北太平洋・ベーリング海における懸濁粒子の脂質成分・安定炭素同位体比の鉛直分布. 日本プランクトン学会報, 47(2), 140-143.

  • Ikehara, M., Kawamura, K., Ohkouchi, N., and Taira, A. (1999) Organic geochemistry of greenish clay and organic-rich sediments since the early Miocene from Hole 985A, Norway Basin. Proceedings of Ocean Drilling Program, Scientific Results, 162, 209-216. doi:10.2973/odp.proc.sr.162.020.1999. [Open Access]
  • Ohkouchi, N., Kawamura, K., and Kawahata, H. (1999) Distributions of three- to seven-ring polynuclear aromatic hydrocarbons on the deep sea floor in the central Pacific. Environmental Science and Technology, 33(18), 3086-3090. doi:10.1021/es981181w. [Open Access]
  • Ohkouchi, N., Kawamura, K., Kawahata, H., and Okada, H. (1999) Depth ranges of alkenone production in the central Pacific Ocean. Global Biogeochemical Cycles, 13(2), 695-704. doi:10.1029/1998GB900024. [Open Access]
  • Ohkouchi, N., Kawamura, K., Kajiwara, Y., Wada, E., Okada, M., Kanamatsu, T., and Taira, A. (1999) Sulfur isotope records around Livello Bonarelli (northern Apennines, Italy) black shale at the Cenomanian-Turonian boundary. Geology, 27(6), 535-538. doi:10.1130/0091-7613. [Open Access]
  • 松永 壮, 河村 公隆, 中塚 武, 大河内 直彦 (1999) 室内実験による不飽和脂肪酸 (オレイン酸) からの低分子ジカルボン酸の光化学的生成 (予報). Researches in Organic Geochemistry, 14, 19-25. [Open Access]
  • 大河内 直彦, 河村 公隆 (1998) 古環境を復元する指標としてのバイオマーカー −太平洋における深海底堆積物を例として−.地学雑誌 (Journal of Geography), 107(2), 189-202. [Open Access]
  • Ikehara, M., Kawamura, K., Ohkouchi, N., Kimoto, K., Murayama, M., Nakamura, T., Oba, T., and Taira, A. (1997) Alkenone sea surface temperature in the Southern Ocean for the last two deglaciations. Geophysical Research Letters, 24(6), 679-682. doi:10.1029/97GL00429. [Open Access]
  • Ohkouchi, N., Kawamura, K., Kawahata, H., and Taira, A. (1997) Latitudinal distributions of terrestrial biomarkers in the sediments from the Central Pacific. Geochimica et Cosmochimica Acta, 61(9), 1911-1918. doi:10.1016/S0016-7037(97)00040-9. [Open Access]
  • Ohkouchi, N., Kawamura, K., and Taira, A. (1997) Fluctuations of terrestrial and marine biomarkers in the western tropical Pacific during the last 23,300 years. Paleoceanography, 12(4), 623-630. doi:10.1029/97PA00820. [Open Access]
  • Ohkouchi, N., Kawamura, K., and Taira, A. (1997) Molecular paleoclimatology: reconstruction of climate variabilities in the late Quaternary. Organic Geochemistry, 27(3-4), 173-183. doi:10.1016/S0146-6380(97)00080-6. [Open Access]
  • Ohkouchi, N., Kawamura, K., Wada, E., and Taira, A. (1997) High abundances of hopanols and hopanoic acids in Cretaceous black shales. Ancient Biomolecules, 1, 183-192.
  • Ohkouchi, N., and Wada, E. (1997) Secular variations in sedimentary organic δ13C during the last 35 M.Y. in the tropical Atlantic, Site 925. Proceedings of Ocean Drilling Program Scientific Results, 154, 501-505. [Open Access]
  • Ohkouchi, N., Kawahata, H., Okada, M., Murayama, M., Matsumoto, E., Nakamura, T., and Taira, A. (1995) Benthic foraminifera cadmium record from the western equatorial Pacific. Marine Geology, 127(1-4), 167-180. doi:10.1016/0025-3227(95)00009-N. [Open Access]
  • Ohkouchi, N., Kawamura, K., Kawahata, H., and Taira, A. (1995) Organic geochemistry of deep sea sediments: how it contributes to paleoceanography. in Global Fluxes of Carbon and Its Related Substances in the Coastal Sea-Ocean-Atmosphere System, pp.533-538.
  • Ohkouchi, N., Kawahata, H., Murayama, M., Okada, M., Nakamura, T., and Taira, A. (1994) Was deep water formed in the North Pacific during the Late Quaternary? Cadmium evidence from the Northwest Pacific. Earth and Planetary Science Letters, 124(1-4), 185-194. doi:10.1016/0012-821X(94)00082-4. [Open Access]
  • Ohkouchi, N., Kawamura, K., Nakamura, T., and Taira, A. (1994) Small changes in the sea surface temperature during the last 20,000 years: Molecular evidence from the western tropical Pacific. Geophysical Research Letters, 21(20), 2207-2210. doi:10.1029/94GL01991. [Open Access]
  • 大河内 直彦, 平 朝彦 (1991) 海底堆積物からみた氷期・間氷期の海洋環境の変化. 第四紀研究 (The Quaternary Research), 30(4), 297-312. [Open Access]
  • 大河内 直彦 (1990) 相模湾の活構造とテクトニクス.地学雑誌 (Journal of Geography), 99(5), 458-470. [Open Access]


  • Ohkouchi, N. (2017) Development of sediment chronologies with amino acid radiocarbon dating. Impact, 2017(11), 33-35. doi:10.21820/23987073.2017.11.33. [Open Access]
  • 大河内 直彦 (2017) アンモニアとアンモニウム. 科学, 87(12), 1081-1082. [PDF]
  • 大河内 直彦 (2017) 小は大を制する. 科学, 87(8), 703-705. [PDF]
  • 大河内 直彦 (2017) 科学における分析の立ち位置. 科学, 87(5), 418-419. [PDF]
  • 大河内 直彦 (2017) 地球が直面するトリレンマ. 科学, 87(1), 9-10. [PDF]
  • 大河内 直彦 (2017) 同位体とトレーサビリティー. 現代化学, 3月号, No.552, 30-33. [PDF]
  • 横山 祐典, 大河内 直彦 (2017) 放射性炭素-14を使った海洋生物の動態・生態系理解. 現代化学, 3月号, No.552, 44-46. [PDF]

  • 大河内 直彦 (2016) 放射性炭素今昔. 科学, 86(10), 985-987. [PDF]
  • 大河内 直彦 (2016) 西南極氷床の行方. 科学, 86(6), 519-520. [PDF]
  • 大河内 直彦 (2016) 人類紀を生きる:窒素編. 科学, 86(3), 196-198. [PDF]
  • 大河内 直彦, 力石嘉人 (2016) 深海生物と化学 同位体が解き明かす「食う‐食われる」の関係. 現代化学, 1月号, No.538, 38-39. [PDF]
  • 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 (2016) 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, 48(7), 302-308.

  • 大河内 直彦 (2015) 華々しさの陰で. 科学, 85(11), 1033-1035. [PDF]
  • 大河内 直彦, 黒田 潤一郎 (2015) 塩の世界. 科学, 85(8), 735-737. [PDF]
  • 大河内 直彦 (2015) 地球はクロマトグラフィー. 科学, 85(5), 437-439. [PDF]
  • 大河内 直彦 (2015) 温泉で想う. 科学, 85(3), 236-237. [PDF]

  • 大河内 直彦 (2014) 海のホメオスタシス. 科学, 84(10), 1001-1003. [PDF]
  • 大河内 直彦 (2014) デルタ (δ) の話. 科学, 84(8), 816-818. [PDF]
  • 大河内 直彦 (2014) 謎だらけのメタン. 科学, 84(3), 253-254. [PDF]
  • 大河内 直彦, 黒田 潤一郎 (2014) 白亜紀の科学掘削に関して - 統合国際深海掘削計画(IODP):2003年から10年の成果(下巻), 号外地球, 65, 264-267.

  • 大河内 直彦 (2013) 海に生き物はどれだけいる? 科学, 83(12), 1324-1325. [PDF]
  • 大河内 直彦 (2013) テトラピロールと地球環境. 科学, 83(7), 722-723. [PDF]
  • 大河内 直彦, 塚本 勝巳 (2013) ウナギレプトセファルスの食性を知る. 科学, 83(4), 366-367. [PDF]
  • 大河内 直彦 (2013) 進化する生体分子. 科学, 83(1), 14-16. [PDF]
  • 大河内 直彦 (2013) 海洋の生物地球化学システムの過去から現在にまつわる諸現象の解明. 海洋化学研究, 26(2), 58-69. [PDF] 第28回海洋化学学術賞(石橋賞)受賞記念論文
  • 菅 寿美, 坂井 三郎, 豊福 高志, 大河内 直彦 (2013) 一点法を用いた微量海水のアルカリ度簡易手分析法. JAMSTEC Report of Research and Development, 17(1), 23-33. [Open Access]
  • 瀧下 清貴, 矢吹 彬憲, 力石 嘉人, 大河内 直彦 (2013) 酸素のない環境に生息する真核生物の細胞膜および食作用にまつわるエトセトラ原始真核細胞モデル:嫌気性原生生物. 細胞工学, 32(12), 1286-1288.
  • 山口 保彦, 大河内 直彦 (2013) 海洋微生物の生態系解析に向けた安定同位体の利用. 水環境学会誌, 36(1), 242-246.

  • 大河内 直彦 (2012) 分子化石の系譜. 科学, 82(10), 1064-1065. [PDF]
  • 大河内 直彦 (2012) 分子の年齢が浮き彫りにした研究の 「落とし穴」. 科学, 82(7), 707-709. [PDF]
  • 大河内 直彦, 高野 淑識, 野牧 秀隆 (2012) エコに暮らす深海底の微生物. 科学, 82(2), 141-143. [PDF]
  • 大河内 直彦, 力石 嘉人, 小川 奈々子 (2012) アミノ酸の窒素安定同位体比から生き物の栄養段階を読み解く. 化学と生物, 50(6), 430-434. [Open Access]
  • 大河内 直彦, 横山 祐典 (2012) 三度目の春を迎えつつある放射性炭素年代法. 科学, 82(5), 483-485. [PDF]
  • 内藤 裕一, 力石 嘉人, 大河内 直彦, 米田 穣 (2012) 古人骨および動物遺存体のアミノ酸窒素同位体比分析について. 佐久考古通信, 111.

  • 大河内 直彦 (2011) 地球システムと気候変動. 石油公団理解促進セミナー教材 第1章.
  • 大河内 直彦, 小川 奈々子, 力石 嘉人 (2011) 琵琶湖の富栄養化と生態系の変化. 科学, 81(7), 621-623. [PDF]
  • 大河内 直彦, 力石 嘉人 (2011) 生態系研究の新しい方法論. 科学, 81(3), 201-202. [PDF]
  • 大河内 直彦, 内藤 裕一, 力石 嘉人, 米田 穣 (2011) 縄文人の食性: 新しい方法論からの視点. 科学, 81(11), 1116-1117. [PDF]
  • 高野 淑識, 野牧 秀隆, 大河内 直彦 (2011) 海底下に棲息する微生物の代謝を in-situ 13C-tracer 法で解明する. Isotope News, 684, 8-13. [PDF]

  • 井龍 康文, 川幡 穂高, 黒田 潤一郎, 西 弘嗣, 横山 祐典, 大河内 直彦 (2010) 地球表層環境−古環境から未来環境へ, 現状を生き抜くために−. 月刊地球, 32(2), 112-119.
  • 大河内 直彦 (2010) チェンジング・ブルー:気候変動の謎に迫る. Blue Earth, 106, 28-31. [PDF]
  • 大河内 直彦, 黒田 潤一郎 (2010) 海洋無酸素事変−地球のダイナミックな営みを探る−. 科学, 80(11), 1117-1123. [PDF]
  • 高野 淑識, 大河内 直彦 (2010) 新しい代謝機構の発見:深海の微生物 「アーキア」 は膜脂質をリサイクルする. JAMSTEC News 「なつしま」, Vol. 81. [PDF]

  • 大河内 直彦 (2009) 古海洋の窒素サイクル:クロロフィルの窒素同位体比を用いた方法論について. 月刊地球, 42(3), 175-179.
  • 大河内 直彦 (2009) 食品管理や犯罪捜査にも役立つ同位体フィンガープリンティング法. JAMSTEC Innovation News, Vol. 9, 7-8. [PDF]
  • 大河内 直彦, 柏山 祐一郎 (2009) クロロフィルの分子化石ポルフィリンの地球科学. 光合成研究, 19(3), 142-154. [PDF]
  • 小川 奈々子, 力石 嘉人, 大河内 直彦 (2009) アミノ酸の天然レベル窒素安定同位体組成を用いた食物解析. 臨床化学, 38(3), 266-271. [PDF]
  • Fukao, Y., Kodaira, S., Kinoshita, M., Tatsumi, Y., Ohkouchi, N., Suzuki, K., Suetsugu, D., Hanyu, T., Sugioka, H., Ono, S., Hirose, K., Yanagisawa, T., Hamano, Y., Fujiwara, T., Kitazato, H., Takahashi, N., and Sakaguchi, H. (2009) Review of five years of activity at IFREE /JAMSTEC. JAMSTEC Report of Research and Development, 9(2), 43-94. [Open Access]

  • 川幡 穂高, 大河内 直彦, 山中 寿朗 (2008) 白亜紀環境における物質循環と生物圏の相互作用. 月刊地球, 30(8), 367-371.
  • 大河内 直彦 (2007) 赤潮の地球〜クロロフィル分子化石と温室地球〜. Japan Geoscience Letters, 3(2), 4-6. [PDF]
  • 力石 嘉人, 柏山 祐一郎, 小川 奈々子, 大河内 直彦 (2007) 生態学指標としての安定同位体:アミノ酸の窒素同位体分析による新展開. RADIOISOTOPES, 56(8), 463-477. [Open Access]
  • 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]
  • 豊田 倫子, 大河内 直彦 (2005) 近未来の海面変動:古海洋学から示唆されるもの. Ship&Ocean Newsletter, 106, 4-5. [Ocean Newsletter]
  • Ohkouchi, N., Kuroda, J., Okada, M., and Tokuyama, H. (2003) Why Cretaceous black shales have high C/N ratios: Implications from SEM-EDX observations for Livello Bonarelli black shales at Cenomanian-Turonian boundary. Frontier Research on Earth Evolution, Vol.1, 239-241. [PDF]
  • 大河内 直彦 (2003) アルケノン古水温計. 地質ニュース, 585, 37-41. [Open Access]
  • 長谷川 卓, 西 弘嗣, 岡田 尚武, 坂本 竜彦, Luc Beaufort, Fabianne Giraud, Oliver Friedrich, 古川 麻里子, 川幡 穂高, 大河内 直彦, 高嶋 礼詩, 黒柳 あずみ, 山村 充, 勝田 長貴 (2002) 白亜紀の海洋無酸素事変 (OAE1b) の高分解能解析. 月刊地球, 24(6), 454-460.
  • Kajiwara, Y., Kaiho, K., and Ohkouchi, N. (1997) An invitation to the sulfur isotope study of marine sediments: implications and constraints for the exogenic sulfur cycle. Annual Report of Institute of Geoscience, University of Tsukuba, 23, 69-74.
  • 池原 実, 大河内 直彦, 河村 公隆 (1997) 植物プランクトンと海水温度計. 月刊海洋 / 号外, 12, 162-165.
  • 大河内 直彦, 平 朝彦 (1996) 深海底堆積物に保存される古環境情報.月刊海洋, 11, 143-147.
  • 大河内 直彦, 和田 英太郎, 河村 公隆, 平 朝彦 (1996) アルケノン生産量と窒素同位体比の関係. 月刊海洋, 28(8), 493-497.
  • 大河内 直彦, 阿波根 直一, 池原 実, 平 朝彦 (1995) 南極海の堆積物研究の意味と問題点. 月刊海洋, 27(6), 374-377.
  • 高橋 孝三, 大場 忠道, 山崎 英樹, 大河内 直彦 (1995) レディオラリア化石からみた過去8万年間の西赤道太平洋における海洋環境変遷. 月刊海洋, 27(8), 466-473.
  • 大河内 直彦, 河村 公隆, 中村 俊夫, 平 朝彦 (1994) 有機分子に残された過去2万年の記録. 月刊海洋, 26(7), 415-419.
  • 大河内 直彦, 川幡 穂高, 平 朝彦 (1993) 最終氷期の太平洋での深層水循環. 月刊海洋, 25(6), 329-333.
  • 岡田 誠, 大河内 直彦 (1992) 氷期−間氷期変動と深層水循環. 科学, 62(10), 648-653.
  • 大河内 直彦 (1991) 氷期−間氷期の海洋環境の変遷. 月刊地球, 13, 525-530.


  • 大河内 直彦, 山福 朱実 (2017) 石油のものがたり. 月刊 たくさんのふしぎ, 第387号, 福音館書店, 40pp.
  • 大河内 直彦 (2015) 地球の履歴書. 新潮社, 220pp.
  • 大河内 直彦 (2015) 酸素同位体温度計.「地球のしくみを理解する」(広島大学理学部地球惑星システム学科 編), 広島大学出版会, 第7章コラム, pp. 292-296.
  • 小川 奈々子, 王 暁水, 篠原 宏文, 大河内 直彦 (2013) 安定同位体比精密測定のためのマニュアル:炭素・窒素同位体比測定分析, 公益財団法人日本分析センター, ISBN978-4-907305-00-0.
  • 大河内 直彦 (2013) 大気中の酸素と二酸化炭素の量を決める仕組み. 「地球環境の事典」 (吉ア正憲 ・野田彰 他編), 朝倉書店, pp.186-187.
  • 大河内 直彦 (2012) 「地球のからくり」 に挑む. 新潮新書, 238pp.
  • 大河内 直彦 (2012) 地球と宇宙の化学事典 (分担執筆) (日本地球化学会 編), 朝倉書店.
  • Bickle, M., Arculus, R., Barrett, P., DeConto, R., Camoin, G., Edwards, K., Fisher, F., Inagaki, F.,Kodaira, S., Ohkouchi, N., Palike, H., Ravelo, C., Saffer, D., and Teagle, D. (2011) Illuminating Earth’s Past, Present and Future. The International Ocean Discovery Program, Science Plan for 2013-2023, 84pp. [IODP Science Plan]
  • 大河内 直彦 (2011) 真に恐れるべきもの. 「気候変動は世界をどう変えるか −2050年の天気−」 解説. シーエムシー出版, pp.365-374.
  • 大河内 直彦 (2011) 図説地球環境 (一部の項目について執筆). 朝倉書店.
  • Ohkouchi, N., Tayasu, I., and Koba, K. (eds.) (2010) Earth, Life, and Isotopes. Kyoto University Press.
  • 大河内 直彦 (2010) 高速液体クロマトグラフィー. 地球化学講座 第8巻 「地球化学実験法」, 培風館, pp.153-157.
  • 大河内 直彦 (2010) 古生物学事典 第2版 (一部の項目について執筆) (日本古生物学会 編), 朝倉書店.
  • 大河内 直彦, 力石 嘉人, 小川 奈々子 (2010) 生き物同士のつながりを診る−アミノ酸の窒素同位体比を用いて. 地球研叢書 「安定同位体というメガネ:人と環境のつながりを診る」 和田英太郎・神松幸弘 編, 昭和堂, pp.15-35.
  • 伊藤 雅史, 大河内 直彦 (2008) 水の第三のマーカーΔ17Oの可能性. 「流域環境評価と安定同位体」 永田俊・宮島利宏 編, 京都大学出版会, pp.369-375.
  • 大河内 直彦 (2008) チェンジング・ブルー:気候変動の謎に迫る. 岩波書店, 402pp. 第25回講談社科学出版賞受賞
  • 大河内 直彦, 高津 文人 (2008) バイオマーカーを利用した微生物生態系構造解析. 「流域環境評価と安定同位体」 永田俊・宮島利宏 編, 京都大学出版会, pp.298-308.
  • 小川 奈々子, 大河内 直彦 (2008) 湖沼の富栄養化の史的復元 −長期保存生物標本の利用−. 「流域環境評価と安定同位体」 永田俊・宮島利宏 編, 京都大学出版会, pp.83-92.
  • 大河内 直彦 (1998) 堆積学辞典 (分担執筆) (支岐常正 編), 朝倉書店.
  • 和田 英太郎, 大河内 直彦 (1996) 第5章:生態システム.岩波講座 「地球惑星科学」 第2巻 「地球システム科学」, 岩波書店, pp.145-184.


  • 元素分析用前処理装置及び元素分析装置(特許第5396245号)
  • 元素分析用前処理装置(特許第4967141号)
  • 低温凝縮型の水電解装置及びこれを利用した質量分析の前処理方法 (特許第3511380号)