SUZUKI Yoshihiro

写真a

Title

Professor

Date of Birth

1965

Research Fields, Keywords

Environment

Mail Address

E-mail address

Laboratory Phone number

+81-985-58-7339

Laboratory Fax number

+81-985-58-7344

Graduating School 【 display / non-display

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    1989.03

    Hokkaido University   Faculty of Fisheries   Graduated

Graduate School 【 display / non-display

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    1994.03

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

 

Papers 【 display / non-display

  • 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]

    Multiple Authorship

     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.

    DOI

  • Negligible contribution of reservoir dams to organic and inorganic transport in the lower Mimi River, Japan

    Nukazawa K., Kihara K., Suzuki Y.

    Journal of Hydrology   555   288 - 297   2017.12  [Refereed]

    Multiple Authorship

     View Summary

    © 2017 Elsevier B.V. Rivers fulfill an essential ecological role by forming networks for material transport from upland forests to coastal areas. The way in which dams affect the organic and inorganic cycles in such systems is not well understood. Herein, we investigated the longitudinal profiles of the various components of the water chemistry across three cascade dams in Japan: the Yamasubaru Dam, Saigou Dam, and Ohuchibaru Dam, which are situated along the sediment-productive Mimi River in different flow conditions. We analyzed the following water quality components: suspended solids (SS), turbidity, total iron (TFe), dissolved iron (DFe), total organic carbon (TOC), total nitrogen (TN), total phosphorus (TP), humic substance (HS), and major ionic components (Na + , Mg 2+ , Ca 2+ , Cl − , NO 3− , and SO 4 2− ) in the downstream channels of the three dams during the low–intermediate-flow and high-flow events from 2012 to 2014. We estimated hourly loads of each component using hourly turbidity data and discharge data (i.e., L–Q model) separately, and the results are integrated to estimate the annual fluxes. The annual fluxes between the methods were compared to verify predictability of the conventional L–Q models. Annual flux of TOC, TN, DFe, and HS estimated by the turbidity displayed similar values, whereas the flux of SS, TFe, and TP tended to increase downstream of the dams. Among the dams, estimated flux proportions for TP and TFe were higher during high-flow events (74%–94%). Considering geographic conditions (e.g., absence of major tributary between the dams), the result implies that accumulated TP and TFe in the reservoirs may be flushed and transported downstream with SS over the short height dams during flood events. Assuming this process, the reservoir dams probably make only a fractional contribution to the organic and inorganic transport in the catchment studied. The percent flux errors for SS, TFe, and TP fluxes ranged from −7.2% to −97% (except for the TP flux in 2013), which highlights the risk of underestimating these components when using an L–Q model.

    DOI

  • Antibiotic resistance profiling and genotyping of vancomycin-resistant enterococci collected from an urban river basin in the provincial city of Miyazaki, Japan

    Nishiyama M, Ogura Y, Hayashi T, Suzuki Y

    Water   9   2017.01  [Refereed]

    Multiple Authorship

    DOI

  • Distribution of antimicrobial resistant Salmonella in an urban river that flows through the provincial city of Miyazaki, Japan

    Suzuki Y, Ushijima M.

    Water and Environment Journal   30   290 - 297   2016.12  [Refereed]

    Multiple Authorship

    DOI

  • Temporal variability in genetic patterns and antibiotic resistance profiles of enterococci isolated from human faeces

    Nishiyama M, Shimauchi H, Suzuki Y

    Microbes and Environments   31   182 - 185   2016.07  [Refereed]

    Multiple Authorship

     View Summary

    Temporal variabilities in the genetic patterns and antibiotic resistance profiles of enterococci were monitored over a 7-month period. Enterococcus faecalis isolates (103 strains) collected from feces showed only one genetic pattern and antibiotic resistance profile within 0 d and 30 d. In contrast, after 60 d and 90 d, the genetic patterns and antibiotic resistance profiles of all E. faecalis isolates (8 strains) clearly differed within 30 d. These results indicate that the genetic patterns and antibiotic resistance profiles of E. faecalis in human feces changed to completely dissimilar patterns between 1 and 2 months.

    DOI

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Books 【 display / non-display

Academic Awards Received 【 display / non-display

  • Environmental Technology/Project Award, Environmental Engineering Forum

    2012.11.30    

Presentations 【 display / non-display

  • A study on removal and recovery of heavy metals from industrial wastewater by precipitation and foam separation

    M. Byambaa, E. Dolgor, K. Shiomori, Y. Suzuki

    日本水環境学会 H29年度九州沖縄支部研究発表会  2018.03  -  2018.03  日本水環境学会九州沖縄支部

  • Recovery of heavy metals from wastewater by precipitation and foam separation using lime and casein

    M. Byambaa, E. Dolgor, Y. Suzuki

    第54回環境工学研究フォーラム  2017.11  -  2017.11  土木学会環境工学委員会

  • Conjugative transfer of sntibiotic resistance from vancomycin- resistance Enterococci to Enterococcus genus in water environment

    Nishiyama M, Suzuki Y

    Water Environment Technology Conference 2016  2016.08  -  2016.08  Japan Society on Water Environment

  • Fate of vancomycin-resistant bacteria and corresponding resistance genes in a sewage treatment plant

    Hashimoto R, Furukawa T, Suzuki Y

    Water Environment Technology Conference 2016  2016.08  -  2016.08  Japan Society on Water Environment

  • Qualitative characterization of coastal sand distribution in Miyazaki Coast along Hyuganada by mineralogical Aanalysis

    Itakiyo T, Suzuki Y

    Water Environment Technology Conference 2016  2016.08  -  2016.08  Japan Society on Water Environment

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