Current Affiliation Organization 【 display / non-display 】

Current Affiliation Organization 【 display / non-display 】

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Study abroad experiences 【 display / non-display 】

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External Career 【 display / non-display 】

Research Interests 【 display / non-display 】

Research Interests 【 display / non-display 】

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Research Areas 【 display / non-display 】

Published Papers 【 display / non-display 】

Published Papers 【 display / non-display 】

• Comprehensive characterization of the interaction between prototypical drug-site markers and multiple sites on human serum albumin by microbore frontal gel chromatography

  Yamauchi, M; Tojo, H; Arakaki, T; Ishida, T

  JOURNAL OF BIOCHEMISTRY ( Journal of Biochemistry )  178 ( 5 ) 325 - 339   2025.11 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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• Improved Frontal Gel Filtration Chromatography to Examine the Interaction between Small Molecules and a Protein with Multiple Specific Binding Sites

  Yamauchi, M; Tojo, H; Arakaki, T; Ishida, T

  ACS OMEGA ( ACS Omega )  10 ( 16 ) 15979 - 15988   2025.04 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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• Source apportionment of black carbon aerosols by isotopes (¹⁴C and ¹³C) and Bayesian modeling from two remote islands in east Asian outflow region

  Uchida, M., K. Mantoku, H. Kumata, N. Kaneyasu, D. Handa, T. Arakaki, T. Kobayashi, S. Hatakeyama, Y. Shibata, K. Kawamura

  Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms ( Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms )  538   64 - 74   2023.05 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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• Aerosol Proteinaceous Matter in Coastal Okinawa, Japan: Influence of Long-Range Transport and Photochemical Degradation.

  Li X, Zhang Y, Shi L, Kawamura K, Kunwar B, Takami A, Arakaki T, Lai S

  Environmental Science & Technology ( Environmental Science and Technology )  56 ( 8 ) 5256 - 5265   2022.04 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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• Heterogeneity and potential aquatic toxicity of hydrogen peroxide concentrations in selected rivers across Japan.

  Sunday MO, Jadoon WA, Ayeni TT, Iwamoto Y, Takeda K, Imaizumi Y, Arakaki T, Sakugawa H

  Science of the Total Environment ( Science of the Total Environment )  733   139349   2020.09 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

  　View Summary

  Hydrogen peroxide (H2O2) is a reactive oxygen species formed in natural water. It is reportedly toxic to aquatic organisms with a predicted no-effect concentration (PNEC) of about 380 nM. In this study, a countrywide investigation of H2O2 concentrations in selected rivers across Japan was conducted to identify rivers that pose toxicity concerns. Twelve rivers with a total catchment area of 13,646 km(2) were selected from different prefectures. Spatial and temporal variation studies showed that the H2O2 concentrations (avg. 320 nM, n = 111) varied by two orders of magnitude (range 212929 nM) across the rivers. The Yamato River in Osaka and Nara prefectures and the Kokubu River in Chiba Prefecture had the highest concentrations at 276669 nM and 2362929 nM, respectively. >75% of the data from the two rivers were either close to or exceeded the PNEC. Most of the results for the other rivers were less than the PNEC. There was a clear seasonal variation in the H2O2 concentrations, with the highest values obtained in summer because of high solar irradiation. The H2O2 concentration had the highest positive correlation (r = 0.61, p < 0.01, n = 111) with the product of dissolved organic carbon and solar radiation intensity, which suggests that these two factors in combination are important in determining the H2O2 concentrations in river water. It was also observed that bigger rivers had lower H2O2 concentration and vice-versa. This shows that the size of a river may influence its H2O2 concentration. This study is the first countrywide survey of H2O2 concentrations in different rivers and evaluation of their relationship with the PNEC. The data provide insight on the factors influencing the concentrations of H2O2 in river water.

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Books 【 display / non-display 】

Books 【 display / non-display 】

• Nature in the Ryukyu archipelago : coral reefs, biodiversity, and the natural environment

  Fujita Kazuhiko, 新垣 雄光, 傳田 哲郎, 日高 道雄 , 広瀬 裕一, Reimer James Davis ( Part: Single Author )

  International Research Hub Project for Climate Change and Coral Reef/Island Dynamics Faculty of Science, University of the Ryukyus  2015

Academic Awards 【 display / non-display 】

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• Excellence in Reviewing

  2016.07   Elsevior (Chemosphere)  

  Winner: Arakaki Takemitsu

Grant-in-Aid for Scientific Research 【 display / non-display 】

Grant-in-Aid for Scientific Research 【 display / non-display 】

• Grant-in-Aid for Scientific Research(C)

  Project Year: 2023.04  -  2026.03 

  Direct: 3,700,000 (YEN)  Overheads: 1,110,000 (YEN)  Total: 4,810,000 (YEN)

• Grant-in-Aid for Scientific Research(C)

  Project Year: 2020.04  -  2023.03 

  Direct: 3,400,000 (YEN)  Overheads: 1,020,000 (YEN)  Total: 4,420,000 (YEN)

• Dynamical, thermodynamical and cloud-microphysical studies of violent wind and heavy rain-producing tropical cyclones: Quantitative improvement of intensity estimations/forecasts

  Grant-in-Aid for Scientific Research(S)

  Project Year: 2016.05  -  2021.03 

  Investigator(s): Tsuboki Kazuhisa 

  Direct: 136,600,000 (YEN)  Overheads: 40,980,000 (YEN)  Total: 177,580,000 (YEN)

  　View Summary

  There is a large error in estimates and forecasts of typhoon intensity. To solve this problem, in situ observations of typhoons using aircraft were conducted. First, a new dropsonde for the measurement was developed. Next, supertyphoons, which is the strongest category of typhoons, were observed using this system: for Typhoon No. 21 in 2017 and Typhoon No. 24 in 2018. In the obsevations, penetrating observations into the eye were conducted at high altitude. The central pressure and maximum wind speed were successfully observed directly using the developed dropsonde system. As a result, typhoon intensity was measured with high precision, and the dynamic and thermodynamic structure of the eye that controls intensity was clarified. Furthermore, dropsonde observations were also made outside the eyewall, and it was shown that assimilation of these data into the forecast model improves typhoon forecasts.

• Grant-in-Aid for challenging Exploratory Research

  Project Year: 2015.04  -  2018.03 

  Direct: 2,900,000 (YEN)  Overheads: 870,000 (YEN)  Total: 3,770,000 (YEN)

• Grant-in-Aid for challenging Exploratory Research

  Project Year: 2012.04  -  2015.03 

  Direct: 3,000,000 (YEN)  Overheads: 900,000 (YEN)  Total: 3,900,000 (YEN)

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SDGs 【 display / non-display 】

SDGs 【 display / non-display 】