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2018

10. Ijiri A., Inagaki F., Kubo Y., Adhikari R. R., Hattori S., Hoshino T., Imachi H., Kawagucci S., Morono Y., Ohtomo Y., Ono S., Sakai S., Takai K., Toki T., Wang D. T., Yoshinaga M. Y., Arnold G. L., Ashi J., Case D. H., Feseker T., Hinrichs K.-U., Ikegawa Y., Ikehara M., Kallmeyer J., Kumagai H., Lever M. A., Morita S., Nakamura K., Nakamura Y., Nishizawa M., Orphan V. J., Røy H., Schmidt F., Tani A., Tanikawa W., Terada T., Tomaru H., Tsuji T., Tsunogai U., Yamaguchi Y. T., Yoshida N. (2018) Deep-biosphere methane production stimulated by geofluids in the Nankai accretionary complex, Science Advances, 4, eaao4631.

9. Yamaguchi Y. T., and McCarthy M. D. (2018) Sources and transformation of dissolved and particulate organic nitrogen in the North Pacific Subtropical Gyre indicated by compound-specific δ15N analysis of amino acids, Geochimica et Cosmochimica Acta, 220, 329-347.

2017

8. 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 .

7. 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.

2016

6. Sakashita W., Yokoyama Y., Miyahara H., Yamaguchi Y. T., Aze T., Obrochta S. P., and Nakatsuka T. (2016) Relationship between early summer precipitation in Japan and the El Niño-Southern and Pacific Decadal Oscillations over the past 400 years, Quaternary International, 397, 300-306.

2015

5. D'Hondt S., Inagaki, F., Zarikian, C. A., Abrams, L. J., Dubois, N., Engelhardt, T., Evans, H., Ferdelman, T., Gribsholt, B., Harris, R.N., Hoppie, B.W., Hyun, J.-H., Kallmeyer, J., Kim, J., Lynch, J.E., McKinley, C. C., Mitsunobu, S., Morono, Y., Murray, R.W., Pockalny, R., Sauvage, J., Shimono, T., Shiraishi, F., Smith, D. C., Smith-Duque, C. E., Spivack, A. J., Steinsbu, B. O., Suzuki, Y., Szpak, M., Toffin, L., Uramoto, G., Yamaguchi, Y. T., Zhang, G., Zhang, X.-H., and Ziebis, W. (2015) Microbial cells and aerobic respiration from seafloor to basement in the South Pacific Gyre, Nature Geoscience, 8, 299-304.

2012

4. Zhang, G., Smith-Duque, C., Tang, S., Li, H., Zarikian, C., D’Hondt, S., Inagaki, F., and IODP Expedition 329 Scientists (including Yamaguchi Y. T.) (2012) Geochemistry of basalts from IODP Site U1365: implications for magmatism and mantle source signatures of the mid-Cretaceous Osbourn Trough, Lithos, 144–145, 73–87.

2010

3. Naito, Y. I., Yamaguchi Y. T., Chikaraishi Y., and Ohkouchi N. (2010) GC/MS analysis of polyunsaturated fatty acids: Rapid separation and structural assignment with polar GC column, Researches in Organic Geochemistry, 26, 139-145. (in Japanese with English figures)

2. Yamaguchi, Y. T., Yokoyama Y., Miyahara H., Sho K., and Nakatsuka T. (2010) Synchronized Northern Hemisphere Climate Change and Solar Magnetic Cycles during the Maunder Minimum, Proceedings of the National Academy of Sciences of the USA, 107 (48), 20697-20702.

2009

1. Yamaguchi, Y. T., Chikaraishi Y., Yokoyama Y., and Ohkouchi N. (2009) GC/MS analysis of amino acids as ethoxycarbonyl ethyl ester, Researches in Organic Geochemistry, 25, 71-83. (in Japanese with English figures)

5. Yamaguchi Y. T., and Ohkouchi N. (2013) Compound-Specific Isotope Analysis as a Tool to Study Microbial Processes in Marine Environments, Journal of Japan Society on Water Environment, 36, 242-246. (in Japanese)

4. D'Hondt, S., Inagaki F., Zarikian C. A., and Expedition 329 Scientists (including Y. T. Yamaguchi) (2012) IODP Expedition 329, Proceedings of the Integrated Ocean Drilling Program, 329, doi:10.2204/iodp.proc.329.2011.

3. Expedition 329 Scientists (including Y. T. Yamaguchi) (2011) South Pacific Gyre: Subseafloor life and habitability in the South Pacific Gyre, IODP Preliminary Report, 329, 1-108, doi:10.2204/iodp.pr.329.2011.

2. Miyahara, H., Yokoyama Y., and Yamaguchi Y. T. (2010) Investigation of solar activity, cosmic ray variation, and their influence on climate change based on cosmogenic nuclides, Proceedings of CAWSES-II Kick-Off Symposium, 1, 18-19.

1. Miyahara, H., Yokoyama Y., and Yamaguchi Y. T. (2009) Influence of the Schwabe/Hale solar cycles on climate change during the Maunder Minimum, Proceedings of the International Astronomical Union, 5, 427-433. (2009)

4. Yamaguchi, Y. T., and McCarthy M. D., Distinct sources of dissolved and particulate organic nitrogen in a California upwelling system indicated by compound-specific δ15N analysis of amino acids.

3. Yamaguchi, Y. T., Broek T. A. B., and McCarthy M. D., Precise compound-specific δ15N analysis of amino acids in dissolved organic matter in seawater by coupling HPLC purification and GC-IRMS.

2. Yamaguchi, Y. T., Takano Y., Suga H., Chikaraishi Y., Ogawa N. O,, Yokoyama Y., and Ohkouchi N., Bacterial contribution to dissolved hydrolyzable amino acids in deep-subseafloor marine sediments: Insights from compound-specific δ15N signatures and enantiomer ratio.

1. Yamaguchi, Y. T., Suga H., Chikaraishi Y., Takano Y., Ogawa N. O., Yokoyama Y., and Ohkouchi N., Diagenesis of organic matter in late Quaternary marine sediments inferred from compound-specific δ15N analysis of amino acids and a chlorin pigment.

(First-authored presentations)

2021

22. Yamaguchi, Y. T., Shimotori, K., Imai, A., Okazaki, Y., Ohara, T., Nakamura, M., Hichiri, S., Okamoto, T., and Hayakawa K., Biodegradation kinetics of different molecular-size classes of freshwater dissolved organic matter during long-term incubations, SIL 2021: 35th Congress of the International Society of Limnology (Virtual, 2021.8) Online presentation.

21. Yamaguchi, Y. T., Shimotori, K., Imai, A., Okazaki, Y., Ohara, T., Nakamura, M., Hichiri, S., Okamoto, T., and Hayakawa K., Biodegradation kinetics and molecular-size distribution of freshwater dissolved organic matter during long-term incubations, ASLO 2021 Aquatic Sciences Meeting (Virtual, 2021.6) Online presentation.

2020

20. Yamaguchi, Y. T., McCarthy M. D., Yoshimizu C., Tayasu I., Koba K., and Hayakawa K., Distribution of “minor” amino acids enantiomers in dissolved organic matter in marine vs. inland waters, Goldschmidt2020 (Virtual, 2020.6) Online presentation.

2018

19. Yamaguchi, Y. T., Nobata S., Kawakami T., Shirai K., Honda K., Miyairi Y., Yokoyama Y., and Nagata T., Radiocarbon as an indicator of animal migration in the ocean: An application to the breeding ecology of Japanese chum salmon, 2018 Ocean Sciences Meeting (Portland, US, 2018.2) Poster.

2017

18. Yamaguchi, Y. T., and McCarthy M. D., The microbial nitrogen pump in the ocean: Role of heterotrophic bacteria in the ocean DON pool indicated by compound-specific δ15N analysis of amino acids, JpGU-AGU Joint Meeting 2017 (Makuhari, Japan, 2017.5) Oral.

2016

17. Yamaguchi, Y. T., and McCarthy M. D., Heterotrophic sources for dissolved organic nitrogen in the oligotrophic ocean indicated by nitrogen isotopic analysis of individual amino acids, Goldschmidt2016 (Yokohama, Japan, 2016.6) Poster.

16. Yamaguchi, Y. T., and McCarthy M. D., Sources, Transformation, and Linkage of Dissolved and Particulate Organic Nitrogen in the Oligotrophic Ocean Indicated by Compound-Specific Nitrogen Isotope Analysis of Amino Acids, IsoEcol 2016 (Tokyo, Japan, 2016.4) Oral.

15. Yamaguchi, Y. T., and McCarthy M. D., Sources and Transformation of Dissolved and Particulate Organic Nitrogen in the North Pacific Subtropical Gyre Indicated by Compound-Specific Nitrogen Isotope Analysis of Amino Acids, 2016 Ocean Science Meeting (New Orlens, USA, 2016.2) Poster.

2014

14. Yamaguchi, Y. T., Broek T. A. B., and McCarthy M. D., Enantiomer-specific (D/L) nitrogen isotopic composition of amino acids in high molecular weight dissolved organic matter in seawater, Goldschmidt2014 (Sacramento, USA, 2014.6) Oral.

2013

13. Yamaguchi, Y. T., Chikaraishi Y., Takano Y., Ogawa N. O., Suga H., Yokoyama Y., and Ohkouchi N., Biogeochemical dynamics of amino acids in deep-subsurface marine sediments: Constraints from compound-specific nitrogen isotopic composition and enantiomer ratio, AGU Fall Meeting 2013 (San Francisco, USA, 2013.12) Poster.

2012

12. Yamaguchi Y. T., Y. Chikaraishi, Y. Takano, N. O. Ogawa, N. Dubois, Y. Yokoyama, N. Ohkouchi, and the Expedition 329 Scientists, Amino acids in subsurface marine sediments in the South Pacific Gyre, IODP Exp.329 Post-cruise meeting (Hawaii, USA 2012.10) Poster.

11. Yamaguchi, Y. T., Y. Takano, Y. Chikaraishi, N. O. Ogawa, H. Suga, Y. Yokoyama, N. Ohkouchi, Constraints on biogeochemical dynamics of organic matter in marine sediments from nitrogen isotope analysis of amino acids, 2012 ALSO Aquatic Science Meeting (Otsu, Japan, 2012.7) Oral.

10. Yamaguchi, Y. T., Y. Takano, Y. Chikaraishi, N. O. Ogawa, H. Imachi, Y. Yokoyama, N. Ohkouchi, Nitrogen isotopic signature of amino acids during microbial processes, 2012 Ocean Science Meeting (Salt Lake City, USA. 2012.2) Poster.

9. Yamaguchi, Y. T., Y. Yokoyama, H. Miyahara, K. Sho and T. Nakatsuka, Synchronized Northern Hemisphere Climate Change and Solar Magnetic Cycles during the Maunder Minimum, The 2nd Nagoya Workshop on the Relationship between Solar Activity and Climate Changes (Nagoya, Japan. 2012.1) Oral.

2011

8. Yamaguchi, Y. T., Y. Takano, Y. Chikaraishi, N. O. Ogawa, H. Imachi, H. Suga, Y. Yokoyama and N. Ohkouchi, Nitrogen isotopic signatures of amino acids in microbes: culture experiments and applications to marine sediments, 25th International Meeting on Organic Geochemistry (Interlarken, Switzerland, 2011.9) Oral.

2010

7. Yamaguchi, Y. T., Y. Yokoyama, H. Miyahara, K. Sho and T. Nakatsuka, Synchronized Northern Hemisphere Climate Change and Solar Magnetic Cycles during the Maunder Minimum, PAGES - 1st Asia 2k Workshop (Nagoya, Japan, 2010.8) Poster.

2009

6. Yamaguchi, Y. T., Y. Takano, Y. Chikaraishi, Y. Yokoyama and N. Ohkouchi, Compound-specific nitrogen isotope compositions of amino acids from microorganisms as a tool for studying microbial processes, INVEST 2009 (Bremen, Germany, 2009.9) Poster.

5. Yamaguchi, Y. T., Y. Takano, Y. Chikaraishi, Y. Yokoyama and N. Ohkouchi, Nitrogen isotopic compositions of amino acids from microorganisms as a tool for studying microbial processes, 19th International Symposium on Environmental Biogeochemistry 2009 (Humburg, Germany, 2009.9) Poster.

4. Yamaguchi, Y. T., Y. Chikaraishi, N. O. Ogawa, Y. Yokoyama and N. Ohkouchi, A rapid analytical method for compound-specific nitrogen isotopic composition of amino acids via N(O,S)-ethoxycarbonyl ethyl ester derivatisation, 24th International Meeting on Organic Geochemistry (Bremen, Germany, 2009.9) Poster.

3. Yamaguchi, Y. T., Y. Chikaraishi, N. O. Ogawa, Y. Yokoyama, H. Matsuzaki, K. Fujikura, K. Oguri, H. Kitazato and N. Ohkouchi, Isotopic diagnoses of the clam and the tubeworm from oceanic chemosynthetic communities around Hatsushima, Sagami-Bay, Japan, 4th International Symposium on Chemosynthesis-Based Ecosystems (Okinawa, Japan, 2009.6) Poster.

2008

2. Yamaguchi, Y. T., Y. Yokoyama, H. Miyahara, T. Nakatsuka, Fluctuations in tree ring cellulose d18O during the Little Ice Age correlate with solar activity, AGU Fall Meeting 2008 (San Francisco, USA, 2008.12) Poster.

1. Yamaguchi, Y. T., Y. Yokoyama, Y. Chikaraishi, N. O. Ogawa, K. Fujikura, K. Oguri, H. Matsuzaki, H. Kitazato and N. Ohkouchi, Nitrogen isotopic compositions of amino acids and radiocarbon contents in oceanic chemosynthetic communities, 7th International Symposium for Subsurface Microbiology (Shizuoka, Japan, 2008.11) Poster.