Publications by authors named "Kei Okamura"

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In-situ analysis of sub-nanomolar level of Fe(II) in open-ocean waters.
Hajime Obata, Akira Mase, Toshitaka Gamo, Jun Nishioka, Kei Okamura

Anal Sci· November 2024

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Deep-sea in situ determination of sulfide using a sensitized chemiluminescent terbium complex.
Keiichi Fujimori, Akira Izutani, Kenta Tsujimoto, Masanari Hirahara, Takayo Moriuchi-Kawakami, Kei Okamura

Anal Sci· July 2023

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Adenosine Triphosphate Measurement in Deep Sea Using a Microfluidic Device.
Tatsuhiro Fukuba, Takuroh Noguchi, Kei Okamura, Teruo Fujii

Micromachines (Basel)· July 2018

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from the Subseafloor Sedimentary Biosphere Disperse to the Hydrosphere through Submarine Mud Volcanoes.
Tatsuhiko Hoshino, Tomohiro Toki, Akira Ijiri, Yuki Morono, Hideaki Machiyama, Kei Okamura

Front Microbiol· June 2017

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Colorimetric pH Measurement of Pressurized Groundwater Containing CO2.
Saeko Mito, Kei Okamura, Hideshi Kimoto

Anal Sci· August 2016

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Effect of sulfide, osmotic, and thermal stresses on taurine transporter mRNA levels in the gills of the hydrothermal vent-specific mussel Bathymodiolus septemdierum.
Ikumi Nakamura-Kusakabe, Toshihiro Nagasaki, Azusa Kinjo, Mieko Sassa, Tomoko Koito, Kei Okamura

Comp Biochem Physiol A Mol Integr Physiol· January 2016

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Evaluation of the Effect on Temperature Conversion of pHT at 25°C in the Temperature Range 0 - 40°C Due to Incorrect Estimations of Salinity, Alkalinity, and Phosphate and Silicate Concentrations.
Kei Okamura, Takuroh Noguchi

Anal Sci· October 2015

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Colorimetric pH measurement for seawater samples using a three light-emitting diodes detector and a calibration method for temperature dependence.
Kei Okamura, Hideshi Kimoto, Takuroh Noguchi, Mayumi Hatta, Hiroaki Kawakami

Anal Sci· August 2015

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Dilute nitric or nitrous acid solution containing halide ions as effective media for pure gold dissolution.
Masashi Hojo, Masahiko Yamamoto, Kei Okamura

Phys Chem Chem Phys· August 2015

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Effects of acidic functional groups on dielectric properties of sodium alginates and carrageenans in water.
Shuntaro Tsubaki, Masanori Hiraoka, Shingo Hadano, Kei Okamura, Tadaharu Ueda

Carbohydr Polym· January 2015

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Fast measurement of dissolved inorganic carbon concentration for small-volume interstitial water by acid extraction and nondispersive infrared gas analysis.
Takuroh Noguchi, Mayumi Hatta, Toshiro Yamanaka, Kei Okamura

Anal Sci· June 2013

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Characteristics of microbial communities in crustal fluids in a deep-sea hydrothermal field of the suiyo seamount.
Shingo Kato, Michiyuki Nakawake, Junko Kita, Toshiro Yamanaka, Motoo Utsumi, Kei Okamura

Front Microbiol· April 2013

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Disturbance of deep-sea environments induced by the M9.0 Tohoku Earthquake.
Shinsuke Kawagucci, Yukari T Yoshida, Takuroh Noguchi, Makio C Honda, Hiroshi Uchida, Kei Okamura

Sci Rep· September 2012

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Discovery of new hydrothermal activity and chemosynthetic fauna on the Central Indian Ridge at 18°-20° S.
Kentaro Nakamura, Hiromi Watanabe, Junichi Miyazaki, Ken Takai, Shinsuke Kawagucci, Kei Okamura

PLoS One· July 2012

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Determination of sulfide with acidic permanganate chemiluminescence for development of deep-sea in-situ analyzers.
Keiichi Fujimori, Kenta Tsujimoto, Takayo Moriuchi-Kawakami, Yasuhiko Shibutani, Masato Ueda, Kei Okamura

Anal Sci· July 2011

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Open-cell titration of seawater for alkalinity measurements by colorimetry using bromophenol blue combined with a non-linear least-squares method.
Kei Okamura, Hideshi Kimoto, Takashi Kimoto

Anal Sci· September 2010

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Tectonic pumping: earthquake-induced chemical flux detected in situ by a submarine cable experiment in Sagami Bay, Japan.
Toshitaka Gamo, Kei Okamura, Kyohiko Mitsuzawa, Kenichi Asakawa

Proc Jpn Acad Ser B Phys Biol Sci· November 2007

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Simultaneous determination of suspended particulate trace metals (Co, Ni, Cu, Zn, Cd and Pb) in seawater with small volume filtration assisted by microwave digestion and flow injection inductively coupled plasma mass spectrometer.
Seiji Nakatsuka, Kei Okamura, Kazuhiro Norisuye, Yoshiki Sohrin

Anal Chim Acta· June 2007

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Interference-based electrochemical biosensor for the measurement of the concentration and isomer ratio of urocanic acid.
Tetsu Tatsuma, Kei Okamura, Kikuo Komori, Akira Fujishima

Anal Chem· October 2002

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