SUZUKI Yoshihiro




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Graduating School 【 display / non-display


    Hokkaido University   Faculty of Fisheries   Graduated

Graduate School 【 display / non-display


    Hokkaido University  Graduate School, Division of Fisheries  Doctor's Course  Completed

Degree 【 display / non-display

  • Hokkaido University -  Doctor (Fisheries Science)

  • University of Miyazaki -  Doctor (Engineering)


Papers 【 display / non-display

  • Optimum Condition for Valuable Seaweed Growth to Utilize Treated Sewage as a Nutrient Source

    Suzuki, Y., Nakada, K., Nukazawa, K., Yamanishi, H.

    Journal of Environmental Science and Technology   12   17 - 25   2019.01  [Refereed]

    Joint Work


  • A highly efficient method for concentrating DNA from river water by combined coagulation and foam separation

    Suzuki, Y., Imafuku, Y., Nishiyama, M., Teranishi, K., Nukazawa, K., Ogura, Y.

    Separation Science and Technology     2019.01  [Refereed]

    Joint Work


  • Simulating the advection and degradation of the environmental DNA of common carp along a river

    Suzuki, Y., Teranishi, K., Matsuwaki, T., Nukazawa, K., Ogura, Y.

    Environmental Science and Technology   52   10562 - 10570   2018.09  [Refereed]

    Joint Work

  • Investigation of <i><b>Escherichia coli</b></i> in Urban Steam with Inflow of Treated Wastewater

    SUZUKI Yoshihiro, NISHIYAMA Masateru, NUKAZAWA Kei, ISHII Satoshi

    Journal of Japan Society on Water Environment   41   19 - 26   2018.03  [Refereed]

    Joint Work

     View Summary

    <p>There is growing concern for the applicability of <i>Escherichia</i> <i>coli</i> as a fecal indicator bacterium in the water environment because <i>E.</i> <i>coli</i> has been reported to regrow in a variety of environments. We investigated longitudinal variation in <i>E.</i> <i>coli</i> counts along a small channel which receives the effluent of treated wastewater. The two fecal indicator bacteria, <i>E.</i> <i>coli</i> and Enterococci, were enumerated, and these bacterial fluxes were calculated from bacteria counts and river flow. As a result, the flux of <i>E.</i> <i>coli</i> was larger downstream of the effluent site than the sum of the fluxes upstream and in the effluent. A high <i>E.</i> <i>coli</i> count was detected in the riverbed sediment of a downstream site. In addition, pulsed-field gel electrophoresis revealed that the genotypes of <i>E.</i> <i>coli</i> isolated from the upstream water, periphyton, and riverbed sediment samples were concordant (similarity = 1.0) . These results indicate that <i>E.</i> <i>coli</i> survived and accumulated in riverbed periphyton and sediment and that <i>E.</i> <i>coli</i> may regrow in a small stream that is strongly affected by treated wastewater. When we assess the fecal pollution in rivers, it is necessary to consider the possibility of <i>E.</i> <i>coli</i> regrowth.</p>

    DOI CiNii

  • Bacterial flora analysis of coliforms in sewage, river water, and ground water using MALDI-TOF mass spectrometry

    Suzuki Y., Niina K., Matsuwaki T., Nukazawa K., Iguchi A.

    Journal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering   53   160 - 173   2018.01  [Refereed]

    Joint Work

     View Summary

    © 2018 Taylor & Francis Group, LLC. The aim of this study was to rapidly and effectively analyze coliforms, which are the most fundamental indicators of water quality for fecal pollution, using matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS). Coliform bacteria were isolated from municipal sewage, river water, and groundwater. For each sample, 100 isolates were determined by MALDI-TOF MS. In addition, these same 100 isolates were also identified via 16S rRNA gene sequence analysis. Obtained MALDI-TOF MS data were compared with the 16S rRNA sequencing analysis, and the validity of MALDI-TOF MS for classification of coliform bacteria was examined. The concordance rate of bacterial identification for the 100 isolates obtained by MALDI-TOF MS analysis and 16S rRNA gene sequence analysis for sewage, river water, and ground water were 96%, 74%, and 62% at the genus level, respectively. Among the sewage, river water, and ground water samples, the coliform bacterial flora were distinct. The dominant genus of coliforms in sewage, river water, and groundwater were Klebsiella spp., Enterobacter spp., and Serratia spp., respectively. We determined that MALDI-TOF MS is a rapid and accurate tool that can be used to identify coliforms. Therefore, without using conventional 16S rRNA sequencing, it is possible to rapidly and effectively classify coliforms in water using MALDI-TOF MS.


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Books 【 display / non-display

Academic Awards Received 【 display / non-display

  • Environmental Technology/Project Award, Environmental Engineering Forum


Presentations 【 display / non-display

  • Antibiotic resistance profiles of regrowth Escherichia coli in urban rivers inflowing treated wastewater

    Xie, H., Hashimoto, R., Nukazawa, K., Suzuki, Y.

    第53回日本水環境学会年会  2019.03  -  2019.03  日本水環境学会

  • 自然河川の最上流域から検出される薬剤耐性菌の供給源の推定

    西村恵美, 糠澤桂, 鈴木祥広

    第53回日本水環境学会年会  2019.03  -  2019.03  日本水環境学会

  • 宮崎県耳川水系における流況改変が河川生態系に及ぼす影響

    白坂厚大, 糠澤桂, 鈴木祥広

    土木学会 平成30年度 西部支部研究発表会  2019.03  -  2019.03  土木学会

  • Changes in phylogroups and antibiotic-resistant profiles of Escherichia coli in municipal wastewater under aerobic condition

    Xie, H., Nukazawa, K., Suzuki, Y.

    第55回環境工学研究フォーラム  2018.12  -  2018.12  土木学会

  • Development of high efficiency concentration method of DNA from river water by combined process of coagulation and form separation

    Jikumaru, A., Imafuku, Y., Teranishi, K., Nukazawa, K., Ogura, Y., Suzuki, Y.

    Water Environment Technology Conference 2018 (WET2018)  2018.07  -  2018.07 

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