Organic Analysis of Peridotite Rocks from the Ashadze and Logatchev Hydrothermal Sites

by Naohiko Ohkouchi, Yoshinori Takano, Marie-Paule Bassez
Published 2009-07-01

Free-Radical Polymerization of Acrylic Acid under Extreme Reaction Conditions Mimicking Deep-Sea Hydrothermal Vents

by Keigo Kinoshita, Yoshinori Takano, Naohiko Ohkouchi, Shigeru Deguchi
Published 2017-06-01

The Influence of Weathering, Water Sources, and Hydrological Cycles on Lithium Isotopic Compositions in River Water and Groundwater of the Ganges–Brahmaputra–Meghna River System in...

by Toshihiro Yoshimura, Daisuke Araoka, Hodaka Kawahata, H. M. Zakir Hossain, Naohiko Ohkouchi
Published 2021-07-01

Compound‐specific isotope analysis of benthic foraminifer amino acids suggests microhabitat variability in rocky‐shore environments

by Masashi Tsuchiya, Yoshito Chikaraishi, Hidetaka Nomaki, Yoko Sasaki, Akihiro Tame, Katsuyuki Uematsu, Naohiko Ohkouchi
Published 2018-08-01

A Systematic Assessment of Stable Sr Isotopic Compositions of Vent Fluids in Arc/Back-Arc Hydrothermal Systems: Effects of Host Rock Type, Phase Separation, and Overlying Sediment

by Toshihiro Yoshimura, Shigeyuki Wakaki, Tsuyoshi Ishikawa, Toshitaka Gamo, Daisuke Araoka, Naohiko Ohkouchi, Hodaka Kawahata
Published 2020-12-01

A new insight into isotopic fractionation associated with decarboxylation in organisms: implications for amino acid isotope approaches in biogeoscience

by Yuko Takizawa, Yoshinori Takano, Bohyung Choi, Prarthana S. Dharampal, Shawn A. Steffan, Nanako O. Ogawa, Naohiko Ohkouchi, Yoshito Chikaraishi
Published 2020-09-01

Amino acids on witness coupons collected from the ISAS/JAXA curation facility for the assessment and quality control of the Hayabusa2 sampling procedure

by Haruna Sugahara, Yoshinori Takano, Yuzuru Karouji, Kazuya Kumagai, Toru Yada, Naohiko Ohkouchi, Masanao Abe, Hayabusa2 project team
Published 2018-12-01

Stable Strontium Isotopic Compositions of River Water, Groundwater and Sediments From the Ganges–Brahmaputra–Meghna River System in Bangladesh

by Toshihiro Yoshimura, Shigeyuki Wakaki, Hodaka Kawahata, Hodaka Kawahata, H. M. Zakir Hossain, Takuya Manaka, Atsushi Suzuki, Tsuyoshi Ishikawa, Naohiko Ohkouchi
Published 2021-02-01

X-ray fluorescence core scanning, magnetic signatures, and organic geochemistry analyses of Ryukyu Trench sediments: turbidites and hemipelagites

by Kan-Hsi Hsiung, Toshiya Kanamatsu, Ken Ikehara, Kazuko Usami, Chorng-Shern Horng, Naohiko Ohkouchi, Nanako O. Ogawa, Saneatsu Saito, Masafumi Murayama
Published 2021-01-01

Trophic hierarchies illuminated via amino acid isotopic analysis.

by Shawn A Steffan, Yoshito Chikaraishi, David R Horton, Naohiko Ohkouchi, Merritt E Singleton, Eugene Miliczky, David B Hogg, Vincent P Jones
Published 2013-01-01

Diazotrophy Drives Primary Production in the Organic-Rich Shales Deposited Under a Stratified Environment During the Messinian Salinity Crisis (Vena del Gesso, Italy)

by Yuta Isaji, Hodaka Kawahata, Yoshinori Takano, Nanako O. Ogawa, Junichiro Kuroda, Toshihiro Yoshimura, Stefano Lugli, Vinicio Manzi, Marco Roveri, Naohiko Ohkouchi
Published 2019-05-01

Biomarker records and mineral compositions of the Messinian halite and K–Mg salts from Sicily

by Yuta Isaji, Toshihiro Yoshimura, Junichiro Kuroda, Yusuke Tamenori, Francisco J. Jiménez-Espejo, Stefano Lugli, Vinicio Manzi, Marco Roveri, Hodaka Kawahata, Naohiko Ohkouchi
Published 2019-08-01

Redox-Controlled Ammonium Storage and Overturn in Ediacaran Oceans

by Christian Hallmann, Emmanuelle Grosjean, Nathan D. Shapiro, Yuichiro Kashiyama, Yuichiro Kashiyama, Yoshito Chikaraishi, Yoshito Chikaraishi, David A. Fike, Naohiko Ohkouchi, Roger E. Summons
Published 2021-09-01

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

by Naoto F. Ishikawa, Nanako O. Ogawa, Yoshito Chikaraishi, Yoshito Chikaraishi, Moto-omi Yamaguchi, Katsunori Fujikura, Yosuke Miyairi, Yusuke Yokoyama, Yusuke Yokoyama, Toshi Nagata, Naohiko Ohkouchi
Published 2021-05-01

Integrated trophic position decreases in more diverse communities of stream food webs

by Naoto F. Ishikawa, Yoshito Chikaraishi, Naohiko Ohkouchi, Aya R. Murakami, Ichiro Tayasu, Hiroyuki Togashi, Jun-ichi Okano, Yoichiro Sakai, Tomoya Iwata, Michio Kondoh, Noboru Okuda
Published 2017-05-01

Isotopic analyses suggest mammoth and plant in the diet of the oldest anatomically modern humans from far southeast Europe

by Dorothée G. Drucker, Yuichi I. Naito, Stéphane Péan, Sandrine Prat, Laurent Crépin, Yoshito Chikaraishi, Naohiko Ohkouchi, Simon Puaud, Martina Lázničková-Galetová, Marylène Patou-Mathis, Aleksandr Yanevich, Hervé Bocherens
Published 2017-07-01

Discovery of a colossal slickhead (Alepocephaliformes: Alepocephalidae): an active-swimming top predator in the deep waters of Suruga Bay, Japan

by Yoshihiro Fujiwara, Masaru Kawato, Jan Yde Poulsen, Hitoshi Ida, Yoshito Chikaraishi, Naohiko Ohkouchi, Kazumasa Oguri, Shinpei Gotoh, Genki Ozawa, Sho Tanaka, Masaki Miya, Tetsuya Sado, Katsunori Kimoto, Takashi Toyofuku, Shinji Tsuchida
Published 2021-01-01