HAMASAKI Koji

J-GLOBAL         Last updated: Oct 10, 2019 at 12:38
 
Avatar
Name
HAMASAKI Koji
Affiliation
The University of Tokyo
Section
Atmosphere and Ocean Research Institute
Job title
Assistant Professor
ORCID ID
0000-0002-8514-506X

Research Interests

 
 

Research Areas

 
 

Academic & Professional Experience

 
Jul 2018
 - 
Today
Professor, Atmosphere and Ocean Research Institute, The University of Tokyo
 
Apr 2006
 - 
Jun 2018
Associate Professor, Atmosphere and Ocean Research Institute, The University of Tokyo
 
2011
 - 
2015
Technical Advisor, Desearch and Development Bureau, Ocean and Earth Division, Ministry of Education, Culture, Sports, Science and Technologies
 
Apr 2002
 - 
Mar 2006
Assistant Professor, Graduate School of Biosphere Science, Hiroshima University
 
Feb 1997
 - 
Mar 2002
Assistant Professor, Faculty of Applied Biological Science, Hiroshima University
 

Education

 
Apr 1990
 - 
Mar 1995
Department of Fisheries Science, Graduate School of Agricultural and Life Sciences, The University of Tokyo
 
Apr 1986
 - 
Mar 1990
Department of Fisheries Science, Faculty of Agriculture, The University of Tokyo
 

Published Papers

 
Ijichi M, Itoh H, Hamasaki K
Archives of microbiology   201(8) 1141-1146   Oct 2019   [Refereed]
Hashihama Fuminori, Suwa Shuhei, Kanda Jota, Ehama Makoto, Sakuraba Ryousuke, Kinouchi Shinko, Sato Mitsuhide, Yamaguchi Tamaha, Saito Hiroaki, Ogura Yoshitoshi, Hayashi Tetsuya, Mori Hiroshi, Kurokawa Ken, Suzuki Shotaro, Hamasaki Koji
PROGRESS IN OCEANOGRAPHY   176    Sep 2019   [Refereed]
Song J, Kang I, Joung Y, Yoshizawa S, Kaneko R, Oshima K, Hattori M, Hamasaki K, Kogure K, Kim S, Lee K, Cho JC
Journal of microbiology (Seoul, Korea)      Feb 2019   [Refereed]
Takuhei Shiozaki, Takuhei Shiozaki, Amane Fujiwara, Minoru Ijichi, Naomi Harada, Shigeto Nishino, Shinro Nishi, Toshi Nagata, Koji Hamasaki
Limnology and Oceanography   63 2191-2205   Sep 2018   [Refereed]
© 2018 The Authors Limnology and Oceanography published by Wiley Periodicals, Inc. on behalf of Association for the Sciences of Limnology and Oceanography Marine nitrogen fixation occurs not only in subtropical and tropical regions but also in col...
Wong SK, Yoshizawa S, Nakajima Y, Cuadra MJ, Nogi Y, Nakamura K, Takami H, Ogura Y, Hayashi T, Chiura HX, Hamasaki K
International journal of systematic and evolutionary microbiology   68(9) 2872-2877   Sep 2018   [Refereed]
Guillemette R, Kaneko R, Blanton J, Tan J, Witt M, Hamilton S, Allen EE, Medina M, Hamasaki K, Koch BP, Azam F
The ISME journal   12(9) 2238-2251   Sep 2018   [Refereed]
Takuhei Shiozaki, Takuhei Shiozaki, Takuhei Shiozaki, Deniz Bombar, Lasse Riemann, Mitsuhide Sato, Mitsuhide Sato, Fuminori Hashihama, Taketoshi Kodama, Taketoshi Kodama, Iwao Tanita, Iwao Tanita, Shigenobu Takeda, Hiroaki Saito, Koji Hamasaki, Ken Furuya
Global Biogeochemical Cycles   32 1028-1044   Jul 2018
©2018. The Authors. The import of nitrogen via dinitrogen fixation supports primary production, particularly in the oligotrophic ocean; however, to what extent dinitrogen fixation influences primary production, and the role of specific types of di...
Sato-Takabe Y, Hamasaki K, Suzuki S
MicrobiologyOpen   e00710   Jul 2018   [Refereed]
Ippei Nagao, Young Joon Eum, Koji Suzuki, Yoko Iwamoto, Yuya Tada, Atsushi Tsuda, Koji Hamasaki, Mitsuo Uematsu, Yoko Iwamoto, Yuya Tada, Mitsuhiro Toratani
Progress in Oceanography   165 145-157   Jul 2018
© 2018 Elsevier Ltd The distributions of seawater dimethylsulfide (DMS) and its precursor dimethylsulfoniopropionate (DMSP) in and around a phytoplankton bloom off the east coast of northern Japan were investigated using seawater samples collected...
Wong SK, Ijichi M, Kaneko R, Kogure K, Hamasaki K
PloS one   13(8) e0202636   2018   [Refereed]
Makio C. Honda, Masahide Wakita, Kazuhiko Matsumoto, Tetsuichi Fujiki, Eko Siswanto, Kosei Sasaoka, Hajime Kawakami, Yoshihisa Mino, Chiho Sukigara, Minoru Kitamura, Yoshikazu Sasai, Sherwood L. Smith, Taketo Hashioka, Chisato Yoshikawa, Katsunori Kimoto, Shuichi Watanabe, Toru Kobari, Toshi Nagata, Koji Hamasaki, Ryo Kaneko, Mario Uchimiya, Hideki Fukuda, Osamu Abe, Toshiro Saino
Journal of Oceanography   73 647-667   Oct 2017
© 2017, The Oceanographic Society of Japan and Springer Japan. A comparative study of ecosystems and biogeochemistry at time-series stations in the subarctic gyre (K2) and subtropical region (S1) of the western North Pacific Ocean (K2S1 project) w...
Wong SK, Park S, Lee JS, Lee KC, Ogura Y, Hayashi T, Chiura HX, Yoshizawa S, Hamasaki K
International journal of systematic and evolutionary microbiology   67(7) 2199-2204   Jul 2017   [Refereed]
Shotaro Suzuki, Ryo Kaneko, Taketoshi Kodama, Taketoshi Kodama, Fuminori Hashihama, Shuhei Suwa, Iwao Tanita, Ken Furuya, Koji Hamasaki
Journal of Oceanography   73 383-395   Jun 2017
© 2017, The Oceanographic Society of Japan and Springer Japan. The subtropical and tropical regions of the Pacific Ocean are less productive than other oceanic regions. Although particle association should be an important strategy for heterotrophi...
Takuhei Shiozaki, Takuhei Shiozaki, Deniz Bombar, Lasse Riemann, Fuminori Hashihama, Shigenobu Takeda, Tamaha Yamaguchi, Makoto Ehama, Koji Hamasaki, Ken Furuya
Global Biogeochemical Cycles   31 996-1009   Jun 2017
©2017. American Geophysical Union. All Rights Reserved. Nitrogen-fixing microorganisms (diazotrophs) provide biologically available nitrogen to plankton communities and thereby greatly influence the productivity in many marine regions. Various cya...
Koji Hamasaki, Ryuki Shishikura, Shotaro Suzuki, Takuhei Shiozaki, Takuhei Shiozaki, Hiroshi Ogawa, Tomotaka Nakamura, Yuichi Suwa
Deep-Sea Research Part II: Topical Studies in Oceanography      Jan 2017
© 2017 Elsevier Ltd. Anaerobic ammonium-oxidizing (anammox) bacteria produce dinitrogen gas from nitrite and ammonium under anoxic conditions and significantly contribute nitrogen removal processes in marine environments. Distribution and activity...
Minoru Ijichi, Koji Hamasaki
Plankton and Benthos Research   12 259-265   Jan 2017
© The Plankton Society of Japan. Ammonia-oxidizing marine archaea (mAOA) have been divided into two groups based on ammonia monooxygenase subunit A gene (amoA) phylogeny and they link to preferred habitat (depth in the water column); one is the Sh...
Azimuddin KM, Hirai J, Suzuki S, Haider MN, Tachibana A, Watanabe K, Kitamura M, Hashihama F, Takahashi K, Hamasaki K
MicrobiologyOpen   5(6) 1016-1026   Dec 2016   [Refereed]
Kaneko R, Wong SK, Ogura Y, Hayashi T, Yoshizawa S, Hamasaki K
Genome announcements   4(6)    Dec 2016   [Refereed]
Shiozaki T, Ijichi M, Isobe K, Hashihama F, Nakamura K, Ehama M, Hayashizaki K, Takahashi K, Hamasaki K, Furuya K
The ISME journal   10(9) 2184-2197   Sep 2016   [Refereed]
Wong SK, Yoshizawa S, Nakajima Y, Ogura Y, Hayashi T, Hamasaki K
Genome announcements   4(4)    Jul 2016   [Refereed]
Ryo Kaneko, Toshi Nagata, Shotaro Suzuki, Koji Hamasaki
Journal of Oceanography   72 427-438   Jun 2016
© 2016, The Oceanographic Society of Japan and Springer Japan. Archaea represent an important component of marine picoplankton. Marine archaeal communities are generally dominated by Marine Group I (MGI) and Marine Group II (MGII), which are affil...
Hamasaki K, Taniguchi A, Tada Y, Kaneko R, Miki T
Gene   576(2 Pt 1) 650-656   Feb 2016   [Refereed]
Sato-Takabe Y, Nakao H, Kataoka T, Yokokawa T, Hamasaki K, Ohta K, Suzuki S
Frontiers in microbiology   7 1996   2016   [Refereed]
Kenji Tsuchiya, Victor S. Kuwahara, Koji Hamasaki, Yuya Tada, Yuya Tada, Tadafumi Ichikawa, Tomoko Yoshiki, Ryota Nakajima, Akio Imai, Shinji Shimode, Tatsuki Toda
Estuarine, Coastal and Shelf Science   167 458-465   Dec 2015
© 2015 Elsevier Ltd. After the passage of typhoon Malou in 2010, daily field samplings were conducted at both inshore (Sta. A) and offshore (Sta. M) stations in Sagami Bay, Japan, to evaluate responses of bacteria and phytoplankton to variations o...
Kenji Tsuchiya, Tomoharu Sano, Nobuyuki Kawasaki, Nobuyuki Kawasaki, Hideki Fukuda, Noriko Tomioka, Koji Hamasaki, Yuya Tada, Yuya Tada, Shinji Shimode, Tatsuki Toda, Akio Imai
Journal of Oceanography   71 675-683   Dec 2015
© 2015, The Oceanographic Society of Japan and Springer Japan. This study proposed a non-radioactive quantitative measurement of bacterial production using stable isotope nitrogen-15-labeled deoxyadenosine ([15N5]-2′-deoxyadenosine; 15N-dA) by liq...
Wong SK, Park S, Lee JS, Lee KC, Chiura HX, Kogure K, Hamasaki K
International journal of systematic and evolutionary microbiology   65(10) 3276-3280   Oct 2015   [Refereed]
Cui Y, Suzuki S, Omori Y, Wong SK, Ijichi M, Kaneko R, Kameyama S, Tanimoto H, Hamasaki K
Applied and environmental microbiology   81(12) 4184-4194   Jun 2015   [Refereed]
Yuki Sato-Takabe, Shotaro Suzuki, Ryuki Shishikura, Koji Hamasaki, Yuya Tada, Takafumi Kataoka, Takafumi Kataoka, Taichi Yokokawa, Naoki Yoshie, Satoru Suzuki
Journal of Oceanography   71 151-159   Jan 2015
© 2014, The Oceanographic Society of Japan and Springer Japan. Aerobic anoxygenic phototrophic bacteria (AAnPB) are bacteriochlorophyll a-containing photoheterotrophic organisms that rely on phototrophy and heterotrophy processes for energy acquis...
Tanaka K, Kuma K, Hamasaki K, Yamashita Y
Scientific reports   4 5292   Jul 2014   [Refereed]
Tomaru A, Sasaki R, Miyahara H, Okino A, Ogawa N, Hamasaki K
PloS one   9(1) e85569   2014   [Refereed]
Sato-Takabe Y, Hamasaki K, Suzuki K
Microbes and environments   29(1) 100-103   2014   [Refereed]
Kawasaki N, Komatsu K, Kohzu A, Tomioka N, Shinohara R, Satou T, Watanabe FN, Tada Y, Hamasaki K, Kushairi MR, Imai A
Applied and environmental microbiology   79(23) 7160-7168   Dec 2013   [Refereed]
Koji Hamasaki, Joji Ishizaka, Hiroaki Saito, Hiroya Sugisaki, Koji Suzuki, Kazutaka Takahashi, Sanae Chiba, Atmosphere and Ocean Research Institute The University of Tokyo, Hydrospheric Atmospheric Research Center Nagoya University, Tohoku National Fisheries Research Institute Fisheries Research Agency, Headquarters Fisheries Research Agency, Graduate School of Environmental Science Hokkaido University, Graduate School of Agricultural and Life Sciences The University of Tokyo, Research Institute for Global Change Japan Agency of Marine-Earth Science and Technology
海の研究 = Umi no Kenkyu (Oceanography in Japan)   22(6) 253-272   Nov 2013
海洋生物を中心とする視点から,海洋学の過去10年程度の研究の進展を総括するとともに,今後10年間でわが国として取り組むべき研究の方向性と必要とされる研究基盤について論じた。特に,「生物多様性」を生物海洋学,海洋生物学を特徴づけるに最もふさわしい言葉として,その解明ならびに地球システムとの関係について重要と考えられる課題毎に論じた。生物多様性の解明においては,動植物プランクトン及び微生物群集多様性の解明,鍵種の生物学,非優占種の役割,多様性と生物間相互作用を重要課題とした。生物多様性と地球シ...
Kazutaka Takahashi, Kazutaka Takahashi, Tadafumi Ichikawa, Hiroaki Saito, Shigeho Kakehi, Yasunori Sugimoto, Kiyotaka Hidaka, Koji Hamasaki
Limnology and Oceanography   58 1972-1984   Sep 2013
We investigated predatory behavior of sapphirinid copepods on doliolids around the Kuroshio Extension at stations experiencing blooms of Dolioletta gegenbauri. Onboard observations showed that adult Sapphirina nigromaculata was an active predator ...
Ryota Nakajima, Kenji Tsuchiya, Nobuyuki Nakatomi, Teruaki Yoshida, Yuya Tada, Fumie Konno, Tatsuki Toda, Victor S. Kuwahara, Koji Hamasaki, Bin Haji Ross Othman, Thirukanthan C. Segaran, Abdul Wahid Mohd Effendy
Marine Ecology Progress Series   490 11-22   Sep 2013
In order to test the hypothesis that the microbial enrichment in the sea-surface microlayer (SML) over coral reefs is significant, we investigated the abundance and production of the microbial community in the SML and sub-surface water (SSW) at a ...
Hamasaki K, Eguchi S, Soyama A, Hidaka M, Takatsuki M, Fujita F, Kanetaka K, Minami S, Kuroki T
World journal of gastroenterology   19(34) 5700-5705   Sep 2013   [Refereed]
Yuya Tada, Ryosuke Makabe, Nobue Kasamatsu-Takazawa, Akito Taniguchi, Koji Hamasaki
Polar Biology   36 691-704   Feb 2013
Roseobacter/Rhodobacter and SAR11, affiliated with Alphaproteobacteria, and the phylum Bacteroidetes constitute a large proportion of marine planktonic bacteria, but information about their growth and distribution patterns in the Southern Ocean is...
Inokuma T, Yamanouchi K, Tomonaga T, Miyazaki K, Hamasaki K, Hidaka M, Takatsuki M, Kanematsu T, Eguchi S
Hepato-gastroenterology   59(119) 2243-2247   Oct 2012   [Refereed]
Yuya Tada, Akito Taniguchi, Yuki Sato-Takabe, Koji Hamasaki
Journal of Oceanography   68 509-519   Aug 2012
Our objective was to track microbial processes associated with serial degradation of organic matter derived from algal blooms. To do this, we analyzed population fluctuations and growth responses of major phylogenetic groups of free-living marine ...
Sato-Takabe Y, Hamasaki K, Suzuki K
Archives of microbiology   194(5) 331-341   May 2012   [Refereed]
Masaru Fujinoki, Masaru Fujinoki, Tomoko Koito, Tomoko Koito, Tomoko Koito, Yoshihiro Fujiwara, Masaru Kawato, Yuya Tada, Koji Hamasaki, Mitsuru Jimbo, Koji Inoue, Koji Inoue
Aquatic Biology   14 135-140   Jan 2012
Fluorescence in situ hybridization (FISH) is a technique used to visualize the distribution of specific nucleotide sequences. For the purpose of detecting symbiotic bacteria in the tissues of host organisms, FISH is usually performed on paraffin o...
Minoru Ijichi, Minoru Ijichi, Koji Hamasaki
Journal of Oceanography   67 739-745   Dec 2011
We analyzed the community structure of marine ammonia-oxidizing archaea (AOA) by sequencing the ammonia monooxygenase subunit A (amoA) gene. Cells were grown in ammonium-enriched seawater at various temperatures. Most amoA clones retrieved prior t...
Tada Y, Taniguchi A, Nagao I, Miki T, Uematsu M, Tsuda A, Hamasaki K
Applied and environmental microbiology   77(12) 4055-4065   Jun 2011   [Refereed]
Taniguchi A, Tada Y, Hamasaki K
Microbes and environments   26(4) 339-346   2011   [Refereed]
Yuya Tada, Akito Taniguchi, Koji Hamasaki
Aquatic Microbial Ecology   59 229-238   Jul 2010
To explore the possibility of calculating phylotype-specific growth rates of marine bacteria, we optimized a protocol that combines bromodeoxyuridine (BrdU) immunocytochemistry with fluorescence in situ hybridization (FISH). The protocol worked we...
Park S, Yoshizawa S, Hamasaki K, Kogure K, Yokota A
The Journal of general and applied microbiology   56(6) 475-480   2010   [Refereed]
Takashi Kamiyama, Hiroyuki Yamauchi, Takuro Iwai, Koji Hamasaki
Plankton and Benthos Research   4 62-71   Sep 2009
We investigated seasonal variations in abundance and cell volume of picoplankton (heterotrophic bacteria and phycoerythrin-rich cyanobacteria) along with environmental conditions at a coastal site in an oyster-farming area in northern Japan. Sampl...
Yoshida N, Nishimura M, Inoue K, Yoshizawa S, Kamiya E, Taniguchi A, Hamasaki K, Kogure K
Microbes and environments   24(4) 297-304   2009   [Refereed]
Taniguchi A, Hamasaki K
Environmental microbiology   10(4) 1007-1017   Apr 2008   [Refereed]

Misc

 
HAMASAKI Koji
Japanese Society of Microbial Ecology   22(1) 5-14   2007
"The occurrence of tetrodotoxin(TTX)and TTX-producing bacteria in sinking particles from coastal waters. "
Proceedings of 7th International Symposium on Microbial Ecology   44   1995
"Isolation and characterization of Shewanella alga from human clinical specimens and emendation of the description of S. alga Shimidu et al. , 1990,335. "
International Journal of Systematic Bacteriology   42 628-634   1992
T. Iida, K. Hamasaki, H. Wakabayashi
Fish Pathology   26(2) 91-92   1991
Diel variability in chlorophyll a specific absorption coefficient of green algae Dunaliella salina.
Proceedings of 12th International Symposium on Okhotsk Sea and Sea Ice   112-116   1997

Conference Activities & Talks

 
Hamasaki Koji, Huang Shir-Ly
日本微生物生態学会講演要旨集   2012   
IJICHI MINORU, HAMASAKI KOJI
日本微生物生態学会講演要旨集   2010   

Works

 
97-10 cruise of Toyoshio-Maru, Hiroshima University : Ocean survey on the environment in Hiroshima Bay and its adjacent area.
1997
KT-96-10 cruise of Tansei-Maru, ORI, University of Tokyo : Ecological studies on marine plankton and food weds in Sagami Bay and Kuroshio area.
1996
KT-94-12 cruise of Tansei-Maru, ORI, University of Tokyo : Microbiological studies in Sagami Bay, Suruga Bay and its adjacent area.
1994
KT-93-13 cruise of Tansei-Maru, ORI, University of Tokyo : Microbiological studies in Sagami Bay, Suruga Bay and its adjacent area.
1993
KH-93-1 cruise of Kakuho-Maru, ORI, University of Tokyo : Biological studies in relation to the seamounts in the middle of North Pacific.
1993

Research Grants & Projects

 
Molecular ecological studies on microbial diversity and organic matter fluxes in marine environment
R and D on Ocean Observation
Project Year: 2000   
Studies on the relationship between harmful algae and marine bacteria
R and D on Ocean Utilization and Ecosystems
Project Year: 2002   
Application of mouse neuroblastoma assay to the detection of paralytic shellfish poisoning toxins and puffer fish toxins.
Promotion of Basic Research Activities for Innovative Biosciences
Project Year: 1994   
Studies on transfer of paralytic shellfish poisoning toxins in marine food webs
R and D on Ocean Utilization and Ecosystems
Project Year: 1998 - 2000