Articles on SPEPS

Purification of hydroxyproline for small-scale radiocarbon dating verified using archaeological bone collagen

Yu Itahashi, Yoshinori Takano, Yoshito Chikaraishi, Nanako O. Ogawa, Naoto F. Ishikawa, Naohiko Ohkouchi, Masako Yamane, Yusuke Yokoyama, Minoru Yoneda

Application of Microsublimation for Sample Purification in Compound-Specific Radiocarbon Analysis

Christian Heusser, Caroline Welte, Lukas Wacker, Kai Sebastian Nakajima, Thomas Blattmann, Negar Haghipour, Timothy Ian Eglinton

Nanomolar-scale Sulfate Sulfur Isotope Analysis Using a Combined Ion Chromatography-Barite Precipitation and nano-EA/IRMS

Nanako O OGAWA, Toshihiro Yoshimura, Takeru Kochi, Junichiro Kuroda, Yoshinori Takano, Naohiko Ohkouchi

Challenges in extraction and quantification of cellulose from deep-sea sediments

Noriyuki Isobe, Sachiko Kawada, Yuto Kaku, Kiyohiko Igarashi

Fatty Acids as the Main Energy Source in Polyps of the Jellyfish (Cnidaria: Aurelia aurita) for Survival Strategy under Overpopulation: Insights from Compound-Specific Isotope Analysis

Nayeon Park, Hyuntae Choi, Yuko Takizawa,Yoshito Chikaraishi

Nitrogen isotopic composition of amino acids reveals a variety of trophic ecology of organisms inhabiting chemosynthesis-based ecosystems

Masashi Tsuchiya, Takao Yoshida, Yoshito Chikaraishi, Nanako O Ogawa, Hidetaka Nomaki, Yoshihiro Fujiwara, Yasuhiko T Yamaguchi, Yohei Tada, Robert G Jenkins, Yoko Sasaki, Katsunori Fujikura, Naohiko Ohkouchi

Elucidating the isotopic dynamics of nitrate and ammonium in the Fuji River using a Lagrangian approach: stable nitrate and fractionating ammonium

Công Thuận Nguyễn, Tomoya Iwata, Yuta Ikeda, Midori Yano, Akiko Makabe, Keisuke Koba

Methane- and hydrogen-dependent prokaryotic deep biosphere at the Suwa Basin, Japan: impacts of hydrogeological processes on subsurface prokaryotic ecology at the boundary between the North American and the Eurasian Plates

Hiroki Nishimura, Atsushi Urai, Yohei Matsui, Toshihiro Yoshimura, Miyuki Ogawara, Hiroyuki Imachi, Yosuke Miyairi, Yusuke Yokoyama, Yuichi Miyabara, Yoshio Takahashi, Yoshinori Takano

Fractionation of nitrogen isotopes in the enzymatic deamination of alanine: an insight into the quantitative evaluation of anaerobic metabolism in ecosystems

Yuko Takizawa, Hyuntae Choi, Mio Shibuya, Nayeon Park, Prarthana S. Dharampal, Shawn A. Steffan, Yoshito Chikaraishi

A compound-specific method for measuring the stable carbon isotopic composition of amino acids: elimination of the effect of isotopic fractionation during derivatization

Yoshito Chikaraishi, Hyuntae Choi, Nayeon Park,Yuko Takizawa

Reconstructing the body temperature of extinct marine reptiles

Takashi Sambuichi, Urumu Tsunogai, Fumiko Nakagawa

Chromatographic isolation for performing enantiomer-specific radiocarbon analysis (ESRA): first method development for individual L- and D-amino acids

Thomas M. Blattmann, Yuchen Sun, Nanako O. Ogawa, Yoshinori Takano, Negar Haghipour, Naoto F. Ishikawa, Timothy I. Eglinton, Naohiko Ohkouchi

Gleaning of δ15N in ecosystems and its animal-organ isotope data: perspectives for the construction of the isotopically ordered world

Eitaro Wada, Yoshihisa Kudo, Hiroshi Mizutani, Hiroshi Minami, Kenji Matsubara, Yoshihiro Yamada, Nanako O. Ogawa, Yukihiro Kohmatsu, Naoko Nishizawa, Isamu Shimizu, Reiichiro Ishii, Fujio Hyodo, Maki N. Aita, Wataru Sakamoto, Naohiko Ohkouchi

Nitrogen and carbon isotopic relationships in the diet and eye lenses of chub mackerel revealed in a laboratory rearing experiment

Chisato Yoshikawa, Nanako O. Ogawa, Naoto F. Ishikawa, Michio Yoneda, Ryuji Yukami, Shin-ichi Ito, Naohiko Ohkouchi

Carnivorous plants: unveiling trophic identity and advanced nitrogen acquisition strategies

Rong Fan, Yuko Takizawa, Prarthana S. Dharampal, Shawn A. Steffan and Yoshito Chikaraishi

Evidence of methanogenic activity associated with past fish farming in Lake Soyang, South Korea

Dong-Hun Lee, Jung-Hyun Kim, Sujin Kang, Dahae Kim, Kyung-Hoon Shin

Magnesium isotopic variation in marine fish organs

Toshihiro Yoshimura, Naoto F. Ishikawa, Nanako O. Ogawa, Soichiro Kusaka, Shigeyuki Wakaki, Tsuyoshi Ishikawa, Kazuya Nagaishi, Masanori Kaneko, Yuta Isaji, Yoshito Chikaraishi, Naohiko Ohkouchi

Distributions of heme B and its implications on Fe biogeochemistry in the eastern Indian Ocean and the western North Pacific Ocean

Yuta Isaji, Koji Sugie, Naoto F. Ishikawa, Nanako O. Ogawa, Kazuhiko Matsumoto, Chisato Yoshikawa, Hajime Obata, Makio C. Honda, Naohiko Ohkouchi

Highly effective energy transfer in the autotroph-heterotroph symbiosis: insights from compound-specific isotope analysis of amino acids

Jincen Li, Mio Shibuya, Yuko Takizawa, Yoshito Chikaraishi

A large elevation in 15N/14N of collagenous amino acids: an insight from starvation experiments of marine organisms

Hyuntae Choi, Yuko Takizawa, Nayeon Park, Yoshito Chikaraishi

Isotope analysis of birds’ eye lens provides early-life information

Emi A. Hasegawa, Jun Matsubayashi, Ichiro Tayasu, Tatsuhiko Goto, Haruka Inoue, Axel G. Rossberg, Chikage Yoshimizu, Masaru Hasegawa, Takumi Akasaka

Differential use of multiple food sources at a bathyal benthic ecosystem in the central Sagami Bay revealed by amino acid nitrogen isotopic compositions

Hidetaka Nomaki, Yoshito Chikaraishi, Nanako O. Ogawa, Koh Maki, Motohiro Shimanaga, Hisami Suga, Masashi Tsuchiya, Toshi Nagata, Naohiko Ohkouchi

Spatiotemporal variations in integrated trophic positions of stream macroinvertebrate communities

Naoto F. Ishikawa, Yoshitoshi Uehara, Takuya Ishida, Tohru Ikeya, Satoshi Asano, Chia-Ying Ko, Tomoya Iwata, Ichiro Tayasu, Naohiko Ohkouchi, Noboru Okuda

Dietary partitioning in sympatric Paradoxurinae civets in Borneo suggested by compound-specific nitrogen isotope analysis of amino acids

Miyabi Nakabayashi, Takumi Tsutaya, Abdul Hamid Ahmad, Yoko Sasaki, Nanako O. Ogawa, Naoto F. Ishikawa, Naohiko Ohkouchi

Natural 14C abundances and stable isotopes suggest discrete uptake routes for carbon and nitrogen in cold seep animals

Hidetaka Nomaki, Shigeaki Kojima, Yosuke Miyairi, Yusuke Yokoyama, Chong Chen

Regulation of nitrogen isotopic ratios of cellular components

Naohiko Ohkouchi, Yuta Isaji, Nanako O. Ogawa