*Japanese articles are not listed on this page. 

Peer-Reviewed Papers

• Kajita, H., Isaji, Y., Kato, R., Nishikura, Y., Murayama, M., Ohkouchi, N., Yang, S., Zheng, H., Wang, K., Nakanishi, T., Sasaki, T., Maeda, A., Suzuki, A., Yamanaka, T., and Kawahata, H. (2023) Climatic change around the 4.2 ka event in coastal areas of the East China Sea and its potential influence on prehistoric Japanese people. Palaeogeography, Palaeoclimatology, Palaeoecology, 609:111310. doi:10.1016/j.palaeo.2022.111310. [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]
• 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]
• 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]
• Isaji, Y., Yoshimura, T., Kuroda, J., Tamenori, Y., Jiménez-Espejo, F.J., Lugli, S., Manzi, V., Roveri, M., Kawahata, H., and Ohkouchi, N. (2019) Biomarker records and mineral compositions of the Messinian halite and K-Mg salts from Sicily. Progress in Earth and Planetary Science, 6:60. doi:10.1186/s40645-019-0306-x. [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]
• 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]
• 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]