Yū Komatsu

National Astronomical Observatory of Japan

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Takayoshi Sasaki

National Institute for Materials Science

Yujiro Watanabe

Hosei University

Yoshinori Fujiki

National Institute for Materials Science

Geoffrey W. Stevens

University of Melbourne

Hirohisa Yamada

National Institute of Technology, Nara College

Syunichi Oshima

Kanazawa Institute of Technology

Kaoru Fujinaga

Kanazawa Institute of Technology

Junzo Tanaka

Tokyo Institute of Technology

Yusuke Moriyoshi

Hosei University

Masayuki Umemura

University of Tsukuba

Cooperative Institutions

The University of Tokyo

University of Tsukuba

Kanazawa Institute of Technology

National Institute for Materials Science

Kyoto University

Tokyo Institute of Technology

Osaka University

Tokyo University of Pharmacy and Life Sciences

Tokyo University of Science

Astrobiology Center

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Air Classification of Korean Natural Zeolite to Improve Adsorption of Ammonium Ion

Journal of Ion Exchange (2007)

Yujiro Watanabe Hirohisa Yamada Shingo Yokoyama Jun-ichi Minato Yun-Jong Kim

Korean natural zeolite with feldspar and illite as impurities was purified by air classification to improve the ammonium adsorption capacities. The treated zeolite was classified into 5 fractions with different amounts of zeolite minerals and impurities. Ammonium adsorptions on the air-classified samples in ammonium chloride solution were compared with that of unclassified zeolite. The highest capacity for ammonium adsorption was obtained for the air-classified sample operated at 12000 rpm with the largest amount of zeolite and the smallest amount of feldspar. The maximum adsorption capacity was 0.93 mmol/g, which was 1.2 times the unclassified sample.

Ammonium chloride

Clinoptilolite

10.5182/jaie.18.530

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Analysis of the histone protein tail and DNA in nucleosome using molecular dynamics simulation

AIP conference proceedings (2013)

Ryoko Fujimori Yū Komatsu Masafumi Fukuda Tokichi Miyakawa Ryota Morikawa

We study the effect of the tails of H3 and H4 histones in the nucleosomes, where DNA and histones are packed in the form of chromatin. We perform molecular dynamics simulations of the complex of DNA and histones and calculate the mean square displacement and the gyration radius of the complex of DNA and histones for the cases with tails intact and the cases with tails missing. Our results show that the H3 tails are important for the motion of the histones. We also find that the motion of one tail is affected by other tails, although the tails are distanced apart, suggesting the correlated motion in biological systems.

Radius of gyration

Mean squared displacement

Molecular biophysics

10.1063/1.4794641

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Light Harvesting and Energy Transfer in Photosystem: Implication for Biosignatures

勇小松雅之梅村光男庄司賢二白石愛栢沼

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Chemiluminescence Detection of Five-membered Heteroaromatic Compounds Using Electrogenerated Tris(2,2′-bipyridine)-ruthenium(III)

Analytical Sciences (2007)

Hitoshi Kodamatani Yū Komatsu Shigeo Yamazaki Keiitsu Saito

Bipyridine

2,2'-Bipyridine

10.2116/analsci.23.407

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Toward extending photosynthetic biosignatures: quantum dynamics calculation of light harvesting complexes

40th COSPAR Scientific Assembly (2014)

Yū Komatsu Masayuki Umemura Mitsuo Shoji Megumi Kayanuma Kazuhiro Yabana

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Highly sensitive and simple method for measurement of pipecolic acid using reverse-phase ion-pair high performance liquid chromatography with tris(2,2′-bipyridine)ruthenium(III) chemiluminescence detection

Journal of Chromatography A (2006)

Hitoshi Kodamatani Yū Komatsu Shigeo Yamazaki Keiitsu Saito

Pipecolic acid

10.1016/j.chroma.2006.11.059

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Distribution coefficients of alkaline earth metal ions and their possible applications on crystalline hydrous titanium dioxide fibers.

BUNSEKI KAGAKU (1983)

Yū Komatsu Yoshinori Fujiki Takayoshi Sasaki

The distribution coefficients of alkaline earth metal ions were measured on crystalline hydrous titanium dioxide fibers at 298K. The adsorption behavior of these ions was well explained by their ion-exchange reaction with hydrogen-ions in the fibers. The distribution coefficients of alkaline earth metals were determined as a function of pH. Separation of strontium(II) from barium(II) was achieved by using a column of this ion-exchanger with hydrochloric acid solutions as an eluent.

Alkaline earth metal

Hydrochloric acid

Barium

Titanium Dioxide

10.2116/bunsekikagaku.32.2_e33

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Adsorption of Cobalt(II) Ions on Crystalline Hydrous Titanium Dioxide Fibers at 298 to 423 K

Bulletin of the Chemical Society of Japan (1986)

Yū Komatsu Yoshinori Fujiki Takayoshi Sasaki

The distribution of cobalt(II) ions between crystalline hydrous titanium dioxide fibers and aqueous solutions has been investigated. The adsorption behavior of cobalt(II) ions is explained in terms of their ion exchange with hydrogen-ions in the fibers. The distribution coefficients of cobalt(II) ions, Kd, increased with increasing temperature at 298–373 K. Slopes of the plots of logKd vs. pH for 398–423 K were ca. +1.6, which was somewhat lower than those for 298–373 K: +2.0. X-Ray powder diffraction patterns indicate that the fibers hold a layer structure up to 373 K but change to anatase or its precursor above this temperature.

Titanium Dioxide

10.1246/bcsj.59.49

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Separation of Chromium(III) and Chromium(VI) by the Combination of Solvent and Ion Exchange Methods

Analytical Sciences/Supplements Proceedings of IUPAC International Congress on Analytical Sciences 2001 (ICAS 2001) (2002)

Junji Noro Kouji Maruyama Yū Komatsu

10.14891/analscisp.17icas.0.i1333.0

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ChemInform Abstract: Na+/H+ Ion‐exchange Process on Layered Hydrous Titanium Dioxide.

Chemischer Informationsdienst (1986)

Takayoshi Sasaki M. Watanabe Yū Komatsu Y. Fujiki

Abstract The Na+/ H+ ion‐exchange on layered hydrous titanium dioxide (H 2 Ti 4 O 9 ‐ l.2‐ 1.3 H 2 O) proceeds stepwise through two stages (O‐50% and 50‐72% conversion).

Titanium Dioxide

10.1002/chin.198614029

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Citations (2)