Biogeosciences

Carbon isotopic changes of 16 proteinogenic amino acids during trophic transfer in a cultured marine consumer

Yuchen Sun, Naoto F. Ishikawa, Nanako O. Ogawa, Yoshinori Takano, Naohiko Ohkouchi

Dynamics of sulfate and nitrate in a temperate stream network: combining multi-isotope analysis and generalized linear mixed-effects models for precautionary conservation

Lei Fujiyoshi, Ichiro Tayasu, Shiho Yabusaki, Takashi F. Haraguchi, Chikage Yoshimizu, Ken’ichi Ohkushi, Fumiko Furukawa, Masayuki Itoh, Tadashi Yokoyama, Hiromune Mitsuhashi

Enhancing nitrogen status evaluation using qualitative indicators: a case study in Matsushima Bay, Japan

Mengqi Jiang, Tetsuroh Ishikawa, Keisuke Takatsudo, Ken’ichi Osaka, Nay Lin Maung, Hirotsugu Arai, Akiko Makabe, Naoko Tokuchi, Kentaro Hayashi, Keisuke Koba

Estimation of methane emissions from inundated areas in northern Eurasia using a process-based model and remotely sensed inundation dynamics data

Akihiko Ito, Hirokli Mizuochi, Tetsuya Hiyama

Working standards and analytical framework for CSIA: isotopic composition (δ¹³C, δ¹⁵N, and δ³⁴S) of 21 amino acids and 7 nucleobases

Nanako O OGAWA, Yoshinori Takano, Yu Itahashi, Naoto F Ishikawa, Naohiko Ohkouchi

Nitrogen and carbon flows in a microbial mat involving anaerobic oxidation of methane in northwestern Black Sea: Perspectives from nitrogen and carbon isotopic composition of coenzyme F430 and its biosynthetic pathway

Masanori Kaneko; Yoshinori Takano; Yuta Isaji; Nanako O Ogawa; Yoshito Chikaraishi; Naoto F. Ishikawa; Hiroyuki Imachi; Yoshihiro Takaki; Miyuki Ogawara; Fumie Kabashima; Martin Krüger; Naohiko Ohkouchi

An Improved Narrower-Diameter EA/IRMS Method with a Built-in Desulfurization Reactor: Optimization for Nitrogen and Carbon Measurement without Sulfur Matrix Interference

Yohei Matsui, Wataru Fujisaki, Takahiro Aze, Toshihiro Miyajima, Shinsuke Kawagucci, Eiji Tasumi, Masahiro Yamamoto, Yoshinori Takano, Tomohiro Toki

Diel and daily changes of water mass structure and biogeochemical processes in early spring in the western subtropical North Pacific

Chiho Sukigara, Taichi Yokokawa, Akiko Makabe, Kaho Mori, Yu Nakajima, Shinya Kouketsu, Eiji Tasumi, Masumi Hasegawa-Takano, Naoto F Ishikawa, Chunqi Jiang, Siyu Jiang, Riku Miyase, Satoshi Nishino, Youta Sugai, Kento Tominaga, Hiroshi Uchida, Yu Yoshida, Susumu Yoshizawa, Shinsuke kawagucci

Biogeochemical properties of shallow-water CO₂ seeps on Himeshima Island and Showa Iwojima Island, Japan

Masahiko Fujii, Tsuneo Ono, Makoto Yamada, Manabu Ooue, Takeru Ito, Jen-Han Yang, Yu Horiuchi, Hisashi Oiwane, Masahide Wakita, Shigeki Wada

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