Latest Update：2020/06/30 18:24:26

IMAI Akio

Researcher Name: IMAI Akio

Div (Section) name/title: Planning Department／Fellow

Research Subject: Characteristics, origin, cycling, funcitons, and effects of organic matter in water environments

Degree(s): Ph.D. in Civil Engineering, University of Texas at Austin

Professional Qualification(s): Engineering,Chemistry,Civil Engineering

Environmental Speciality Field: water environment,lake

Keyword(s): dissolved organic matter,recalcitrant dissolved organic matter,aquatic humic substances,DOM fractionation method,size exclusion chromatography with TOC detection,three-dimensional lake model,determination of iron speciation,metal speciation,algal growth potential test

Brief Description of Research: I have been studying dissolved organic matter (DOM) in water environments since around 1995. Research topics are wide in variety: characteritics and orignis of DOM in lake and river, effects of DOM on algal blooming cyanobacteria, trihalomethane formation potential of DOM, characterization of DOM in effluent from wastewater treatment plants, voltammetric determination of iron speciation in freshwaters, growth characteristics of water-bloom forming cyanobacteria, stable and radioactive carbon isotopic ratios of lake and river DOM, iron speciation in river and lake, dissolved carbohydrates and their composition in lake water, characterization of DOM using three-dimensional excitation-emission matrix fluorescence spectra, quantification of Microcystis in lakewater by Real-time PCR, molecular size determination of DOM by size exclusion chromatograpy with TOC detection, and so on.

Career: Research Assistant, 1982-1988, Unversity of Texas at Austin, USA
Researcher, National Institute for Environmental Studies (NIES), Japan, 1988-1992
Senior Researcher, NIES, Japan, 1992-1997
Section Leader, NIES, Japan, 1997-2011
Deputy Director, Center for Regional Environmental Research, NIES, Japan 2012-2013
Director, Center for Regional Environmental Research, NIES, Japan, 2014-2016
Head, Lake Biwa Branch Office, NIES, Japan, 2017-Present

Membership of Academic Society: Japan Society on Water Environment (JSWE),The Japanese Society of Limnology,American Chemical Society,American Society of Limnology and Oceanography

Research Subject

Fiscal Year: 2019
- 24703 : Regional Environmental Research
- 24753 : Long-term Monitoring Projects of Freshwater Ecosystems
- 24794 : Study on water quality and lake-bottom environment for protection of the soundness of water environment
- 24983 : Continuous operation system of microalgae production optimized for sustainable tropical aquaculture
Fiscal Year: 2018
- 24323 : Long-term monitoring projects of freshwater ecosystems
- 24346 : Regional Environmental Research
- 24438 : Continuous operation system of microalgae production optimized for sustainable tropical aquaculture
- 24518 : Evaluation of organic carbon budgets in Lake Biwa for management of water quality and ecosystem
- 24528 : Study on water quality and lake-bottom environment for protection of the soundness of water environment
Fiscal Year: 2017
- 23853 : Regional Environmental Research
- 23885 : Long-term monitoring projects of freshwater ecosystems
- 24020 : Evaluation of organic carbon budgets in Lake Biwa for management of water quality and ecosystem
- 24069 : Continuous operation system of microalgae production optimized for sustainable tropical aquaculture
- 24176 : Study on water quality and lake-bottom environment for protection of the soundness of water environment
Fiscal Year: 2016
- 23394 : Regional Environmental Research
- 23478 : Long-term monitoring projects of freshwater ecosystems
- 23599 : Continuous operation system of microalgae production optimized for sustainable tropical aquaculture
- 23601 : Evaluation of organic carbon budgets in Lake Biwa for management of water quality and ecosystem
- 23736 : Novel lake ecosystem management by sustainable harvesting and effective utilization of aquatic weed biomass
Fiscal Year: 2015
- 23010 : Assessment of functions and integrity of basin ecosystems
- 23011 : Evaluation on linkage between ecosystem function and environmental factor in river basin
- 23034 : Monitoring projects and database management of biodiversity and ecosystem
- 23313 : Study on linkages between molecular size, chemical composition and reactivity of dissolved organic matter in aquatic environments
- 23314 : Study on quantitative evaluation of a black-box-type autochthonous loading in lake environments−Benthic fluxes from sediments to the water column
- 23334 : Novel lake ecosystem management by sustainable harvesting and effective utilization of aquatic weed biomass
Fiscal Year: 2014
- 22598 : Assessment of functions and integrity of basin ecosystems
- 22599 : Evaluation on linkage between ecosystem function and environmental factor in river basin
- 22622 : Monitoring projects and database management of biodiversity and ecosystem
- 22751 : Study on linkages between molecular size, chemical composition and reactivity of dissolved organic matter in aquatic environments
- 22753 : Development of nonradioactive method for the measurement of bacterial secondary produciton rate
- 22754 : Study on quantitative evaluation of a black-box-type autochthonous loading in lake environments−Benthic fluxes from sediments to the water column
- 22798 : Flux estimation from sediment in nutrients and global warming gas by MRI and stable isotope analysis
- 22968 : Novel lake ecosystem management by sustainable harvesting and effective utilization of aquatic weed biomass
Fiscal Year: 2013
- 22182 : Assessment of functions and integrity of basin ecosystems
- 22183 : Evaluation on linkage between ecosystem function and environmental factor in river basin
- 22206 : Monitoring projects and database management of biodiversity and ecosystem
- 22275 : Study on linkages between molecular size, chemical composition and reactivity of dissolved organic matter in aquatic environments
- 22276 : Development of nonradioactive method for the measurement of bacterial secondary produciton rate
- 22293 : Study on quantitative evaluation of a black-box-type autochthonous loading in lake environments−Benthic fluxes from sediments to the water column
- 22449 : Regional environmental assessment of radioactive materials based on the multimedia modelling and strategic monitoring
- 22472 : Flux estimation from sediment in nutrients and global warming gas by MRI and stable isotope analysis
Fiscal Year: 2012
- 21753 : Assessment of functions and integrity of basin ecosystems
- 21754 : Evaluation on linkage between ecosystem function and environmental factor in river basin
- 21777 : Monitoring projects and database management of biodiversity and ecosystem
- 21827 : Flux estimation from sediment in nutrients and global warming gas by MRI and stable isotope analysis
- 21913 : Regional environmental assessment of radioactive materials based on the multimedia modelling and strategic monitoring
Fiscal Year: 2011
- 21278 : Cycling of organic matter and its interactivity with microbial ecosystem in lake
- 21279 : Origin, characteristics and mass balance of recalcitrant dissolved organic matter in lake
- 21311 : Assessment of functions and integrity of basin ecosystems
- 21312 : Evaluation on linkage between ecosystem function and environmental factor in river basin
- 21335 : Monitoring projects and database management of biodiversity and ecosystem
- 21513 : Development of a technique for calculating algal-derived organic carbon level in lake
- 21647 : Study on multimedia modeling and long-term monitoring for radioactive substance
- 21678 : Studies of carbon cycling within river watershed by the analysis of 13C natural abundance of dissolved inorganic carbon (DIC) in lotic environments
- 21689 : The analysis of nitrogen loading and discharge within watershed by nitrogen and oxygen isotope measurement of nitrate, dissolved or suspended organic matter
Fiscal Year: 2010
- 20868 : Studies on dissolved organic matter in aquatic environments
- 20872 : Cycling of organic matter and its interactivity with microbial ecosystem in lake
- 20873 : Origin, characteristics and mass balance of recalcitrant dissolved organic matter in lake
- 21025 : Terrestrial Monitoring
- 21241 : Development of Watershed Environmental Impact Assessment Procedure
Fiscal Year: 2009
- 20472 : Studies on origin and dynamics of recalcitrant organic matter in oligotrophic Lake Towada
- 20473 : Cycling of organic matter and its interactivity with microbial ecosystem in lake
- 20474 : Origin, characteristics and mass balance of recalcitrant dissolved organic matter in lake
- 20650 : Terrestrial Monitoring
- 20669 : Studies on dissolved organic matter in aquatic environments
- 20695 : Development of Watershed Environmental Impact Assessment Procedure
Fiscal Year: 2008
- 20059 : Cycling of organic matter and its interactivity with microbial ecosystem in lake
- 20097 : Development of Watershed Environmental Impact Assessment Procedure
- 20160 : Terrestrial Monitoring
- 20342 : Studies on dissolved organic matter in aquatic environments
- 20343 : Studies on origin and dynamics of recalcitrant organic matter in oligotrophic Lake Towada
- 20345 : Determination of origins of dissolved organic matter using enantiomers of amino acids
- 20392 : Examination on Environmental Quality Standards for Conservation of the Living Environment in F.Y. 2008 (field observation and mechanism study)
Fiscal Year: 2007
- 10380 : Biological community and material recycling monitoring of the ecotone inLake Kasumigaura
- 10441 : Determination of iron specition in lake and its effects through iron availability on algal blooming
- 10490 : Development of chromatograhy system with organic cabon detection for evaluating characteristics and reactivity of dissolved organic matter in aquatic systems
- 10588 : Development of Watershed Environmental Impact Assessment Procedure
- 10595 : Terrestrial Monitoring
- 10606 : Studies on dissolved organic matter in aquatic environments
- 10690 : Determination of origins of dissolved organic matter using enantiomers of amino acids
- 10713 : Studies on origin and dynamics of recalcitrant organic matter in oligotrophic Lake Towada
Fiscal Year: 2006
- 10027 : Biological community and material recycling monitoring of the ecotone inLake Kasumigaura
- 10051 : Evaluation and restoration of lake environment based on linkages among the bioreactivity and chemical composition of organic matter
- 10077 : Pilot Project on Mekong River Ecosystem Monitoring
- 10165 : Determination of iron specition in lake and its effects through iron availability on algal blooming
- 10234 : Development of chromatograhy system with organic cabon detection for evaluating characteristics and reactivity of dissolved organic matter in aquatic systems
- 10321 : Development of Watershed Environmental Impact Assessment Procedure
- 10328 : Terrestrial Monitoring
- 10339 : Studies on dissolved organic matter in aquatic environments
Fiscal Year: 2005
- 9328 : Global Environmental Monitoring
- 9353 : Research project on integrated environmental management aided by modelling of eco-system functions through the basin in East Asia(4) Studies on the environmental management in coastal zones
- 9394 : Study on aquatic humic substances in the aquatic environment
- 9448 : Studies on assessment of restration technology of wetland ecosystem
- 9475 : Biological community and material recycling monitoring of the ecotone inLake Kasumigaura
- 9522 : Evaluation and restoration of lake environment based on linkages among the bioreactivity and chemical composition of organic matter
- 9548 : Pilot Project on Mekong River Ecosystem Monitoring
- 9661 : Determination of iron specition in lake and its effects through iron availability on algal blooming
Fiscal Year: 2004
- 8935 : Global Environmental Monitoring
- 8989 : Research project on integrated environmental management aided by modelling of eco-system functions through the basin in East Asia(4) Studies on the environmental management in coastal zones
- 9028 : Study on aquatic humic substances in the aquatic environment
- 9093 : Evaluation and monitoring of lake-water quality as drinking water source by using DOM frationation methods
- 9165 : Studies on assessment of restration technology of wetland ecosystem
- 9193 : Biological community and material recycling monitoring of the ecotone inLake Kasumigaura
- 9273 : Evaluation and restoration of lake environment based on linkages among the bioreactivity and chemical composition of organic matter
- 9299 : Pilot Project on Mekong River Ecosystem Monitoring
Fiscal Year: 2003
- 8599 : Global Environmental Monitoring
- 8649 : Studies on mass balance of dissolved organic matter in lake and its functions and effects on lacustrine ecosystems and water quality
- 8658 : Study on development of assesment methods for water pollultion and monitoring methods for toxic cyanobacteria in water resource regions in Asia
- 8706 : Research project on integrated environmental management aided by modelling of eco-system functions through the basin in East Asia(4) Studies on the environmental management in coastal zones
- 8746 : Study on aquatic humic substances in the aquatic environment
- 8813 : Evaluation and monitoring of lake-water quality as drinking water source by using DOM frationation methods
- 8900 : Studies on assessment of restration technology of wetland ecosystem
- 8923 : Biological community and material recycling monitoring of the ecotone inLake Kasumigaura
Fiscal Year: 2002
- 8306 : Global Environmental Monitoring
- 8367 : The research about the analysis of water environment ecosystem and the evaluation of the restoration effect based on the organic and nutrient salts in lakes and marshes
- 8377 : Evaluation on dynamics and trihalomethane formation potential of recalcitrant dissolved organic matter in lake water
- 8401 : Research project on integrated environmental management aided by modelling of eco-system functions through the basin in East Asia (4) Studies on the environmental management in coastal zones
- 8431 : Studies on mass balance of dissolved organic matter in lake and its functions and effects on lacustrine ecosystems and water quality
- 8441 : Study on development of assesment methods for water pollultion and monitoring methods for toxic cyanobacteria in water resource regions in Asia
- 8528 : Study on aquatic humic substances in the aquatic environment
Fiscal Year: 2001
- 8000 : Global Environmental Monitoring
- 8121 : The research about the analysis of water ecosystem and the evaluation of the restoration effect based on the organic and nutrient salts in lakes and marshes
- 8131 : Evaluation on dynamics and trihalomethanes formation potential of recalcitrant dissolved organic matter in lake water
- 8154 : Research project on integrated environmental management aided by modelling of eco-system functions through the basin in East Asia (4) Studies on the environmental management in coastal zones
- 8215 : Studies on mass balance of dissolved organic carbon in lake and its effects on lake ecosystems and water quality
- 8225 : O-1 Study on development of assesment methods for water pollultion and monitoring methods for toxic cyanobacteria in water resource regions in Asia
- 8291 : Study on aquatic humic substances in the aquatic environment

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Research Result (Publication)

all
Original Paper
Other Publications

Original Paper
Characterization of dissolved organic matter in wastewater during aerobic, anaerobic, and anoxic treatment processes by molecular size and fluorescence analyses

Presenter : Komatsu K., Onodera T., Kohzu A., Syutsubo K., Imai A.
Title : , Water Research, 171: (2020)
Original Paper
Incorporation characteristics of exogenous 15N-labeled thymidine, deoxyadenosine, deoxyguanosine and deoxycytidine into bacterial DNA

Presenter : Tsuchiya K., Sano T., Tomioka N., Kohzu A., Komatsu K., Shinohara R., Shimode S., Toda T., Imai A.
Title : , PLoS ONE, 15(2)(e0229740): (2020)
Original Paper
Comparison between humic-like peaks in excitation-emission matrix spectra and resin-fractionated humic substances in aquatic environments

Presenter : Komatsu K., Imai A., kawasaki N.
Title : , Limnology, 20(1):109-120 (2019)
Original Paper
Long-term observations of the vertical distributions of mineral elements and phosphorus dynamics in sediments in a shallow eutrophic lake in Japan

Presenter : Shimotori K., Imai A., Kohzu A., Komatsu K., Koshikawa-K.M., Hayashi S., Watanabe Mirai.
Title : , Journal of Soils and Sediments, 19(3):1566-1575 (2019)
Original Paper
Vertical variation of bulk and metabolically active prokaryotic community in sediment of a hypereutrophic freshwater lake

Presenter : Tsuboi S., Kohzu A., Imai A., Iwasaki K., Yamamura S.
Title : , Environmental Science and Pollution Research, 26:9379-9389 (2019)
Original Paper
Decrease in bacterial production over the past three decades in the north basin of Lake Biwa, Japan

Presenter : Tsuchiya K., Tomioka N., Sano T., Kohzu A., Komatsu K., Imai A., Hayakawa K., Nagata T., Okamoto T., Hirose Y.
Title : , Limnology (2019)
Original Paper
Seasonal variability and regulation of bacterial production in a shallow eutrophic lake

Presenter : Tsuchiya K., Sano T., Tomioka N., Kohzu A., Komatsu K., Shinohara R., Takamura N., Nakagawa M., Sugai Y., Kuwahara V. S. , Toda T., Fukuda H., Imai A.
Title : , Limnology and Oceanography (2019)
Original Paper
Coniferous coverage as well as catchment steepness influences local stream nitrate concentrations within a nitrogen-saturated forest in central Japan

Presenter : Watanabe Mirai., Miura S., Hasegawa S., Koshikawa-K.M., Takamatsu T., Kohzu A., Imai A.
Title : , Science of the Total Environment, 636:539-546 (2018)
Original Paper
Effects of macrophyte harvesting on the water quality and bottom environment of Lake Biwa,Japan

Presenter : Kohzu A., Shimotori K., Imai A.
Title : , Limnology (2018)
Original Paper
Changes in the composition of phosphorus (P) compound groups in sediment and P in sediment pore water in a shallow eutrophic lake: a 31P NMR study

Presenter : Shinohara R., Imai A., Kawasaki N., Komatsu K., Kohzu A., Miura S., Sano T., Sato T., Tomioka N., Shimotori K.
Title : , Limnology, 18(1):141-151 (2017)
Original Paper
Role of organic phosphorus in sediment in a shallow eutrophic lake

Presenter : Shinohara R., Hiroki M., Kohzu A., Imai A., Inoue T., Furusato E., Komatsu K., Sato T., Tomioka N., Shimotori K., Miura S.
Title : , Water Resources Research, 53:7175-7189 (2017)
Original Paper
The dynamics of pico-sized and bloom-forming cyanobacteria in large water bodies in the Mekong River Basin

Presenter : Fukushima M., Tomioka N., Jutagate T., Hiroki M., Murata T., Preecha C., Avakul P., Phomikong P., Imai A.
Title : , PLOS ONE (2017)
Original Paper
Growth rates and tolerance to low water temperature of freshwater bacterioplankton strains: ecological insights from shallow hypereutrophic lakes in Japan

Presenter : Watanabe K., Ishii Y., Komatsu N., Kitamura T., Watanabe Mirai., Yamamura S., Imai A., Hayashi S.
Title : , Hydrobiologia, 792(1):67-81 (2017)
Original Paper
Unexpected diversity of pepA genes encoding leucine aminopeptidases in sediments from a freshwater lake

Presenter : Tsuboi S., Yamamura S., Imai A., Iwasaki K.
Title : , Microbes and Environments, 31(1):49-55 (2016)
Original Paper
Dynamics of particulate phosphorus in a shallow eutrophic lake

Presenter : Shinohara R., Imai A., Kohzu A., Tomioka N., Furusato E., Sato T., Sano T., Komatsu K., Miura S., Shimotori K.
Title : , Science of the Total Environment, 563-564(1):413-423 (2016)
Original Paper
Release of Nitrogen and Phosphorus from Aquaculture Farms to Selangor River, Malaysia

Presenter : Kawasaki N., Kushairi M.R.M., Nagao N., Yusoff F., Imai A., Kohzu A.
Title : , International Journal of Environmental Science and Development, 7(2):113-116 (2016)
Original Paper
Seasonal Changes of Nutrient Distributions along Selangor River, Malaysia

Presenter : Kawasaki N., Kushairi M.R.M., Nagao N., Yusoff F., Imai A., Kohzu A.
Title : , Int, 3(1):113-116 (2016)
Original Paper
Quantification and characterization of coastal dissolved organic matter by high-performance size exclusion chromatography with ultraviolet absorption, fluorescence, and total organic carbon analyses

Presenter : Shimotori K., Satou T., Imai A., Kawasaki N., Komatsu K., Kohzu A., Tomioka N., Shinohara R., Miura S.
Title : , Limnology and Oceanography: Methods, 14(10):637-648 (2016)
Other Publications
Spatial and temporal variations in sediment enzyme activities and their relationship with the trophic status of Erhai Lake

Presenter : Zhang L., Wang S., Imai A.
Title : , Ecological Engineering, 75:365-369 (2015)
Original Paper
New radioisotope-free method for measuring bacterial production using [15N5]-2'-deoxyadenosine and liquid chromatography mass spectrometry (LC-MS) in aquatic environments

Presenter : Tsuchiya K., Sano T., Kawasaki N., Fukuda H., Tomioka N., Hamasaki K., Tada Y., Shimode S., Toda T., Imai A.
Title : , Journal of Oceanography, 71:675-683 (2015)
Original Paper
Typhoon-induced response of phytoplankton and bacteria in temperate coastal waters

Presenter : Tsuchiya K., Kuwahara V.S., Hamasaki K., Tada Y., Ichikawa T., Yoshiki T., Nakajima R., Imai A., Shimoda S.
Title : , Estuarine, Coastal and Shelf Science, 167:458-465 (2015)
Original Paper
Paleoclimatic changes on the southern Tibetan Plateau over the past 19,000 years recoreded in Lake Pumoyum Co, and their implications for the southwest monsoon evolution

Presenter : Nishimura M., Matsunaka T., Morita Y., Watanabe T., Nakamura T., Zhu L., Nara F.W., Imai A., Izutsu Y., Hasuike K.
Title : , Palaeogeography, Palaeoclimatology, Palaeoecolgy, 396:75-92 (2014)
Original Paper
Biological nitrate utilization in south Siberian lakes (Baikal and Hovsgol) during the last Glacial period: the influence of climate change on primary productivity

Presenter : Nara F.W., Watanabe T., Kakegaw T., Minoura K., Fagel N., Horiuchi K., Nakamura T., Kawai T., Imai A.
Title : , Quaternary Science Reviews, 90:69-79 (2014)
Original Paper
Linking Temporal Changes in Bacterial Community Structures with the Detection and Phylogenetic Analysis of Neutral Metalloprotease Genes in the Sediments of a Hypereutrophic Lake

Presenter : Tsuboi S., Yamamura S., Imai A., Satou T., Iwasaki K.
Title : , Microbes and Environments, 29(3):314-321 (2014)
Original Paper
Bacterial contribution to dissolved organic matter in eutrophic lake Kasumigaura, Japan

Presenter : Kawasaki N., Komatsu K., Kohzu A., Tomioka N., Shinohara R. , Satou T., Nara Watanabe F., Tada Y., Hamasaki K., Kushairi M. R. M., Imai A.
Title : , Applied and Environmental Microbiology, 79(23):7160-7168 (2013)
Original Paper
Parameterization of chlorophyll a-specific absorption coefficients and effects of their variations in a highly eutrophic lake: a case study at Lake Kasumigaura, Japan

Presenter : Imai A., Yoshimura K., Zaitsu N., Sekimura Y., Matsushita B., Fukushima T.
Title : , Hydrobiologia, 691(1):157-169 (2012)
Original Paper
Ecological niche separation in the Polynucleobacter subclusters linked to quality of dissolved organic matter: a demonstration using a high sensitivity cultivation-based approach

Presenter : Watanabe K., Komatsu N., Kitamura T., Ishii Y., Park H-D., Miyata R., Noda N., Sekiguchi Y., Satou T., Watanabe Mirai., Yamamura S., Imai A., Hayashi S.
Title : , Environmental Microbiology, 14(9):2511-2525 (2012)
Original Paper
Biogenic Phosphorus Compounds in Sediment and Suspended Particles in a Shallow Eutrophic Lake: A 31P-Nuclear Magnetic Resonance (31P NMR) Study

Presenter : Shinohara R. , Imai A., Kawasaki N., Komatsu K., Kohzu A., Miura S., Sano T., Satou T., Tomioka N.
Title : , Environmental Science & Technology, 46(19):10572-10578 (2012)
Original Paper
Analysis of stream water quality and estimation of nutrient load with the aid of Quick Bird remote sensing imagery

Presenter : He B., Oki K., Wang Y., Oki T., Yamashiki Y., Takara K., Miura S., Imai A., Komatsu K., Kawasaki N.
Title : , Hydrological Sciences Journal, 57(5):850-860 (2012)
Original Paper
Long-term light environment variability in Lake Biwa and Lake Kasaumigaura, Japan: modeling approach

Presenter : Terrel M.M., Fukushima T., Matsushita B., Imai A.
Title : , Limnology, 13:237-252 (2012)
Original Paper
Direct evidence for nitrogen isotope discrimination during sedimentation and early diagenesis in Lake Kasumigaura, Japan

Presenter : Kohzu A., Imai A., Miyajima T., Fukushima T., Matsushige K., Komatsu K., Kawasaki N., Miura S., Satou T.
Title : , Org.Geochem., 42(2):173-183 (2011)
Original Paper
Effect of light availability on Microcystis aeruginosa blooms in shallow hypereutrophic Lake Kasumigaura

Presenter : Tomioka N., Imai A., Komatsu K.
Title : , Journal of Plankton Research, 33(8):1263-1273 (2011)
Original Paper
Fast and precise method for HPLC-size exclusion chromatography with UV and TOC (NDIR) detection: Importance of multiple detectors to evaluate the characteristics of dissolved ortanic matter

Presenter : Kawasaki N., Matsushige K., Komatsu K., Kohzu A., Nara F.W., Ogishi F., Yahata M., Mikami H., Goto T., Imai A.
Title : , Water Research, 45:6240-6248 (2011)
Original Paper
Direct evidence for the alteration of 13C natural abundances during early diagenesis in Lake Kasumigaura, Japan

Presenter : Kohzu A., Imai A., Ohkouchi N., Fukushima T., Kamiya K., Komatsu K., Tomioka N., Kawasaki N., Miura S., Satou T.
Title : , Geochemistry Geophysics Geosystems, 12(10): (2011)
Original Paper
In-situ growth rate of Microcystis spp. and their growth-limiting factors: use of cellular RNA content

Presenter : Nagai T. , Tomioka N., Imai A., Matsushige K.
Title : , Limnology, 12(3):235-243 (2011)
Original Paper
Radiocarbon measurements of dissolved organic carbon in sewage-treatment-plant effluent and domestic sewage

Presenter : Watanabe Nara F. , Imai A., Matsushige K., Komatsu K., Kawasaki N., Shibata Y.
Title : , Nucl.Instrum.Methods Phys.Res.,B, 268(7/8):1142-1145 (2010)
Original Paper
High contribution of recalcitrant organic matter to DOC in a Japanese oligotrophic lake revealed by 14C measurements

Presenter : Nara F,, Imai A., Uchida M., Matsushige K., Komatsu K., Kawasaki N., Shibata Y., Amano K., Mikami H., Hanaishi R.
Title : , Radiocarbon, 52(3):1078-1083 (2010)
Original Paper
Testing the spectral decomposition algorithm(SDA)for different phytoplankton species by a simulation based on tank experiments

Presenter : Oyama Y., Matsushita B., Fukushima T., Chen J., Nagai T., Imai A.
Title : , Int.J.Remote Sens., 31(6):1605-1623 (2010)
Original Paper
Climate control of sulfate influx to Lake Hovsgol, northwest Mongolia, during the last glacial-postglacial transition: Constraints from sulfur geochemistry

Presenter : Nara F. W., Watanabe T., Kakegawa T., Seyama H., Horiuchi K., Nakamura T., Imai A., Kawasaki N., Kawai T.
Title : , Palaeogeogr., Palaeoclimatol., Palaeoecol., 298(3/4):278-285 (2010)
Original Paper
Long-term changes in lake sediments and their influences on lake water quality in Japanese shallow lakes

Presenter : Fukushima T., Kamiya K., Onda Y., Imai A., Matsushige K.
Title : , Fundam.Appl.Limnol.,Arch.Hydrobiol., 177(3):177-188 (2010)
Original Paper
Application of spectral decomposition algorithm for mapping water quality in a turbid lake(Lake Kasumigaura, Japan) from Landsat TM data

Presenter : Oyama Y., Matsushita B., Fukushima.T, Matsushige K., Imai A.
Title : , ISPRS J.Photogramm.Remote Sensing, 64:73-85 (2009)
Original Paper
Stable carbon isotopic characterization of DOC and its humic fraction in Lake kasumigaura,Japan

Presenter : Nara F., Imai A., Matsushige K., Komatsu K.
Title : , Verh.Internat.Verein.Limnol., 30(8):1307-1309 (2009)
Original Paper
Quantification of microcystis in a eutrophic lake by simple DNA extraction and SYBR green real-time PCR

Presenter : Tomioka N., Nagai T., Kawasaki T., Imai A., Matsushige K., Kohata K.
Title : , Microbes Environ., 23(4):306-312 (2008)
Original Paper
Short-term temporal variations in iron concentration and speciation in a canal during a summer algal bloom

Presenter : Nagai T., Imai A., Matsushige K., Yokoi K., Fukushima T.
Title : , Aquat.Sci., 70:388-396 (2008)
Original Paper
A new algorithm for estimating chlorophyll-a concentration from multi-spectral satellite data in case II waters: a simulation based on a controlled laboratory experiment

Presenter : Oyama Y., Matsushita B., Fukushima T., Nagai T., Imai A.
Title : , Int.J.Remote Sensing, 28(7):1437-1453 (2007)
Dissolved iron and its speciation in a shallow eutrophic lake and its inflowing rivers

Presenter : , Imai A.
Title : , Water Res., 41:775-784 (2007)
Seasonal variation in spieces of dissolved organic carbon in a lacustrine environment revealed by paired isotopic measurements(Δ(14)C and δ(13)C)

Presenter : Imai A., Nara F., Imai A., Yoneda M., Matsushige K., Komatsu K., Nagai T., Shibata Y., Watanabe T., , , KAZUHIRO Komatsu
Title : , Radiocarbon, 49(2):767-773 (2007)
Budgets of major ionic species and nutrients on a damreservoir in forested watershed

Presenter : Imai A.
Title : , Water Sci.Technol., 56(1):287-293 (2007)
Growth characteristics and growth modeling of Microcystis aeruginosa and Planktothrix agardhii under iron limitation

Presenter : , Imai A.
Title : , Limnology, 8:261-270 (2007)
Effect of iron complexation with dissolved organic matter on the growth of cyanobacteria in a eutrophic lake

Presenter : , Imai A.
Title : , Aquat.Microb.Ecol., 44:231-239 (2006)
Runoff and loads of nutrients and heavy metals from an urbanized area

Presenter : , Imai A.
Title : , Water Sci.Technol., 53(2):203-213 (2006)
Application of (14)C measurements for isotopic characterization of dissolved organic carbon(DOC) in lake water

Presenter : , , KAZUHIRO Komatsu, Imai A.
Title : , 9th Symp.Jpn.AMS Soc.(Grad.Sch.Univ.Tokyo,Jpn.Soc.AMS Res. eds.,140p.)(第9回AMSシンポジウム東京大学大学院 AMS研究協会) (2006)
Limiting nutrients on the growth of bloom-forming cyanobacteria with special focus on iron speciation

Presenter : , Imai A.
Title : , Verh.Int.Ver.Limnol., 29:949-952 (2005)
Why has Lake Kasumigaura become turbid?

Presenter : , Imai A.
Title : , Verh.Int.Ver.Limnol., 29:732-737 (2005)
Voltammetric determination of dissolved iron and its speciation in freshwater

Presenter : , Imai A.
Title : , Limnology, 5:87-94 (2004)
Photoalteration of dissolved organic matter(DOM) released from Microcystis aeruginosa in different growth phases: DOM-fraction distribution and biodegradability

Presenter : Imai A.
Title : , Arch.Hydrobiol., 159(2):271-286 (2004)
Trihalomethane formation potential of dissolved organic matter in a shallow eutrophic lake

Presenter : , Imai A.
Title : , Water Res., 37(17):4284-4294 (2003)
Photoalteration in biodegradability and chemical compositions of algae-derived dissolved organic matter

Presenter : , Imai A.
Title : , Korean J.Limnol., 36(3):235-241 (2003)
Vertical distribution and fractionation of dissolved organic carbon in a deep Korean reservoir,Lake Soyang

Presenter : , Imai A.
Title : , Arch.Hydrobiol., 155(2):333-352 (2002)
Characterization of dissolved organic matter in effluents from wastewater treatment plants

Presenter : , Imai A.
Title : , Water Res., 36:859-870 (2002)
Fractionation and characterization of dissolved organic matter in a shallow eutrophic lake,its inflowing rivers,and other organic matter sources

Presenter : , Imai A.
Title : , Water Res., 35(17):4019-4028 (2001)
Chemical characterization of dissolved organic matter in Hiroshima Bay,Japan

Presenter : Imai A.
Title : , Estuarine,Coastal Shelf Sci., 53(1):51-62 (2001)
Properties of dissolved organic carbon(DOC)released by three species of blue-green algae

Presenter : , Imai A.
Title : , Korean J.Lim., 34(1):20-29 (2001)
Effects of iron limitation and aquqtic humic substances on the growth of Microcystis aeruginosa

Presenter : , Imai A.
Title : , Can.J.Aquat.Sci., 56:1929‐1937 (1999)
Effects of Pre-Ozonation in Refractory Leachate Treatment by the Biological Activated Carbon Fluidized Bed Process

Presenter : , Imai A.
Title : , Environ.Technol., 19:213‐221 (1998)
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Presenter : Imai A.,
Title : , 地球の危機的状況(海老瀬潜一・今井章雄・今井秀樹共訳,森北出版,256p.) (1996)
Speciation of chromium (III) in activated sludge

Presenter : Imai A.
Title : , Water Environ.Res., 68(3):301‐310 (1996)
Freshwater DOC measurements by high-temperature combustion:comparison of differential (DTC-DIC) and DIC purging methods

Presenter : , Imai A.
Title : , Water Res., 30(11):2717‐2722 (1996)
Dissolved organic carbon in a eutrophic lake;dynamics,biodegradability and origin

Presenter : , Imai A.
Title : , Aquatic Sci., 58(2):139‐157 (1996)
Biodegradation and adsorption in refractory leachate treatment by the biological activated carbon fluidized bed process

Presenter : , Imai A.
Title : , Water Res., 29(2):687‐694 (1995)
Treatment of landfill leachate with the microorganism-attached activated carbon fluidized bed process

Presenter : , , Imai A.
Title : , Int.J.Environ.Stud., 41:51‐63 (1993)
Cr(III) in activated sludge

Presenter : Imai A.
Title : , J.Environ.Eng.ASCE, 119(1):137‐158 (1993)
Removal of refractory organics and nitrogen from landfill leachate by the microorganism-attached activated carbon fluidized bed process

Presenter : , , , Imai A.
Title : , Water Res., 27(1):143‐145 (1993)
Treatment of a landfill leachate containing refractory organics and ammonium nitrogen by the microorganism-attached activated carbon fluidized bed process

Presenter : , , Imai A.
Title : , Water Sci.Technol., 26(9-11):1999‐2002 (1992)
Dynamic behavior of Cr(III) in activated sludge

Presenter : Imai A.
Title : , Water Sci.Technol., 23:1047‐1056 (1991)
Effects of pH and oxidation state of chromium on the behavior of chromium in the activated sludge process

Presenter : Imai A.
Title : , Water Res., 24:1143‐1150 (1990)
The behavior of chromium in the activated sludge process

Presenter : Imai A.
Title : , Tech.Rep., CRWR-226:188 (1988)

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Characterization of dissolved organic matter in wastewater during aerobic, anaerobic, and anoxic treatment processes by molecular size and fluorescence analyses

Presenter : Komatsu K., Onodera T., Kohzu A., Syutsubo K., Imai A.
Title : , Water Research, 171: (2020)
Incorporation characteristics of exogenous 15N-labeled thymidine, deoxyadenosine, deoxyguanosine and deoxycytidine into bacterial DNA

Presenter : Tsuchiya K., Sano T., Tomioka N., Kohzu A., Komatsu K., Shinohara R., Shimode S., Toda T., Imai A.
Title : , PLoS ONE, 15(2)(e0229740): (2020)
Comparison between humic-like peaks in excitation-emission matrix spectra and resin-fractionated humic substances in aquatic environments

Presenter : Komatsu K., Imai A., kawasaki N.
Title : , Limnology, 20(1):109-120 (2019)
Long-term observations of the vertical distributions of mineral elements and phosphorus dynamics in sediments in a shallow eutrophic lake in Japan

Presenter : Shimotori K., Imai A., Kohzu A., Komatsu K., Koshikawa-K.M., Hayashi S., Watanabe Mirai.
Title : , Journal of Soils and Sediments, 19(3):1566-1575 (2019)
Vertical variation of bulk and metabolically active prokaryotic community in sediment of a hypereutrophic freshwater lake

Presenter : Tsuboi S., Kohzu A., Imai A., Iwasaki K., Yamamura S.
Title : , Environmental Science and Pollution Research, 26:9379-9389 (2019)
Decrease in bacterial production over the past three decades in the north basin of Lake Biwa, Japan

Presenter : Tsuchiya K., Tomioka N., Sano T., Kohzu A., Komatsu K., Imai A., Hayakawa K., Nagata T., Okamoto T., Hirose Y.
Title : , Limnology (2019)
Seasonal variability and regulation of bacterial production in a shallow eutrophic lake

Presenter : Tsuchiya K., Sano T., Tomioka N., Kohzu A., Komatsu K., Shinohara R., Takamura N., Nakagawa M., Sugai Y., Kuwahara V. S. , Toda T., Fukuda H., Imai A.
Title : , Limnology and Oceanography (2019)
Coniferous coverage as well as catchment steepness influences local stream nitrate concentrations within a nitrogen-saturated forest in central Japan

Presenter : Watanabe Mirai., Miura S., Hasegawa S., Koshikawa-K.M., Takamatsu T., Kohzu A., Imai A.
Title : , Science of the Total Environment, 636:539-546 (2018)
Effects of macrophyte harvesting on the water quality and bottom environment of Lake Biwa,Japan

Presenter : Kohzu A., Shimotori K., Imai A.
Title : , Limnology (2018)
Changes in the composition of phosphorus (P) compound groups in sediment and P in sediment pore water in a shallow eutrophic lake: a 31P NMR study

Presenter : Shinohara R., Imai A., Kawasaki N., Komatsu K., Kohzu A., Miura S., Sano T., Sato T., Tomioka N., Shimotori K.
Title : , Limnology, 18(1):141-151 (2017)
Role of organic phosphorus in sediment in a shallow eutrophic lake

Presenter : Shinohara R., Hiroki M., Kohzu A., Imai A., Inoue T., Furusato E., Komatsu K., Sato T., Tomioka N., Shimotori K., Miura S.
Title : , Water Resources Research, 53:7175-7189 (2017)
The dynamics of pico-sized and bloom-forming cyanobacteria in large water bodies in the Mekong River Basin

Presenter : Fukushima M., Tomioka N., Jutagate T., Hiroki M., Murata T., Preecha C., Avakul P., Phomikong P., Imai A.
Title : , PLOS ONE (2017)
Growth rates and tolerance to low water temperature of freshwater bacterioplankton strains: ecological insights from shallow hypereutrophic lakes in Japan

Presenter : Watanabe K., Ishii Y., Komatsu N., Kitamura T., Watanabe Mirai., Yamamura S., Imai A., Hayashi S.
Title : , Hydrobiologia, 792(1):67-81 (2017)
Unexpected diversity of pepA genes encoding leucine aminopeptidases in sediments from a freshwater lake

Presenter : Tsuboi S., Yamamura S., Imai A., Iwasaki K.
Title : , Microbes and Environments, 31(1):49-55 (2016)
Dynamics of particulate phosphorus in a shallow eutrophic lake

Presenter : Shinohara R., Imai A., Kohzu A., Tomioka N., Furusato E., Sato T., Sano T., Komatsu K., Miura S., Shimotori K.
Title : , Science of the Total Environment, 563-564(1):413-423 (2016)
Release of Nitrogen and Phosphorus from Aquaculture Farms to Selangor River, Malaysia

Presenter : Kawasaki N., Kushairi M.R.M., Nagao N., Yusoff F., Imai A., Kohzu A.
Title : , International Journal of Environmental Science and Development, 7(2):113-116 (2016)
Seasonal Changes of Nutrient Distributions along Selangor River, Malaysia

Presenter : Kawasaki N., Kushairi M.R.M., Nagao N., Yusoff F., Imai A., Kohzu A.
Title : , Int, 3(1):113-116 (2016)
Quantification and characterization of coastal dissolved organic matter by high-performance size exclusion chromatography with ultraviolet absorption, fluorescence, and total organic carbon analyses

Presenter : Shimotori K., Satou T., Imai A., Kawasaki N., Komatsu K., Kohzu A., Tomioka N., Shinohara R., Miura S.
Title : , Limnology and Oceanography: Methods, 14(10):637-648 (2016)
New radioisotope-free method for measuring bacterial production using [15N5]-2'-deoxyadenosine and liquid chromatography mass spectrometry (LC-MS) in aquatic environments

Presenter : Tsuchiya K., Sano T., Kawasaki N., Fukuda H., Tomioka N., Hamasaki K., Tada Y., Shimode S., Toda T., Imai A.
Title : , Journal of Oceanography, 71:675-683 (2015)
Typhoon-induced response of phytoplankton and bacteria in temperate coastal waters

Presenter : Tsuchiya K., Kuwahara V.S., Hamasaki K., Tada Y., Ichikawa T., Yoshiki T., Nakajima R., Imai A., Shimoda S.
Title : , Estuarine, Coastal and Shelf Science, 167:458-465 (2015)
Paleoclimatic changes on the southern Tibetan Plateau over the past 19,000 years recoreded in Lake Pumoyum Co, and their implications for the southwest monsoon evolution

Presenter : Nishimura M., Matsunaka T., Morita Y., Watanabe T., Nakamura T., Zhu L., Nara F.W., Imai A., Izutsu Y., Hasuike K.
Title : , Palaeogeography, Palaeoclimatology, Palaeoecolgy, 396:75-92 (2014)
Biological nitrate utilization in south Siberian lakes (Baikal and Hovsgol) during the last Glacial period: the influence of climate change on primary productivity

Presenter : Nara F.W., Watanabe T., Kakegaw T., Minoura K., Fagel N., Horiuchi K., Nakamura T., Kawai T., Imai A.
Title : , Quaternary Science Reviews, 90:69-79 (2014)
Linking Temporal Changes in Bacterial Community Structures with the Detection and Phylogenetic Analysis of Neutral Metalloprotease Genes in the Sediments of a Hypereutrophic Lake

Presenter : Tsuboi S., Yamamura S., Imai A., Satou T., Iwasaki K.
Title : , Microbes and Environments, 29(3):314-321 (2014)
Bacterial contribution to dissolved organic matter in eutrophic lake Kasumigaura, Japan

Presenter : Kawasaki N., Komatsu K., Kohzu A., Tomioka N., Shinohara R. , Satou T., Nara Watanabe F., Tada Y., Hamasaki K., Kushairi M. R. M., Imai A.
Title : , Applied and Environmental Microbiology, 79(23):7160-7168 (2013)
Parameterization of chlorophyll a-specific absorption coefficients and effects of their variations in a highly eutrophic lake: a case study at Lake Kasumigaura, Japan

Presenter : Imai A., Yoshimura K., Zaitsu N., Sekimura Y., Matsushita B., Fukushima T.
Title : , Hydrobiologia, 691(1):157-169 (2012)
Ecological niche separation in the Polynucleobacter subclusters linked to quality of dissolved organic matter: a demonstration using a high sensitivity cultivation-based approach

Presenter : Watanabe K., Komatsu N., Kitamura T., Ishii Y., Park H-D., Miyata R., Noda N., Sekiguchi Y., Satou T., Watanabe Mirai., Yamamura S., Imai A., Hayashi S.
Title : , Environmental Microbiology, 14(9):2511-2525 (2012)
Biogenic Phosphorus Compounds in Sediment and Suspended Particles in a Shallow Eutrophic Lake: A 31P-Nuclear Magnetic Resonance (31P NMR) Study

Presenter : Shinohara R. , Imai A., Kawasaki N., Komatsu K., Kohzu A., Miura S., Sano T., Satou T., Tomioka N.
Title : , Environmental Science & Technology, 46(19):10572-10578 (2012)
Analysis of stream water quality and estimation of nutrient load with the aid of Quick Bird remote sensing imagery

Presenter : He B., Oki K., Wang Y., Oki T., Yamashiki Y., Takara K., Miura S., Imai A., Komatsu K., Kawasaki N.
Title : , Hydrological Sciences Journal, 57(5):850-860 (2012)
Long-term light environment variability in Lake Biwa and Lake Kasaumigaura, Japan: modeling approach

Presenter : Terrel M.M., Fukushima T., Matsushita B., Imai A.
Title : , Limnology, 13:237-252 (2012)
Direct evidence for nitrogen isotope discrimination during sedimentation and early diagenesis in Lake Kasumigaura, Japan

Presenter : Kohzu A., Imai A., Miyajima T., Fukushima T., Matsushige K., Komatsu K., Kawasaki N., Miura S., Satou T.
Title : , Org.Geochem., 42(2):173-183 (2011)
Effect of light availability on Microcystis aeruginosa blooms in shallow hypereutrophic Lake Kasumigaura

Presenter : Tomioka N., Imai A., Komatsu K.
Title : , Journal of Plankton Research, 33(8):1263-1273 (2011)
Fast and precise method for HPLC-size exclusion chromatography with UV and TOC (NDIR) detection: Importance of multiple detectors to evaluate the characteristics of dissolved ortanic matter

Presenter : Kawasaki N., Matsushige K., Komatsu K., Kohzu A., Nara F.W., Ogishi F., Yahata M., Mikami H., Goto T., Imai A.
Title : , Water Research, 45:6240-6248 (2011)
Direct evidence for the alteration of 13C natural abundances during early diagenesis in Lake Kasumigaura, Japan

Presenter : Kohzu A., Imai A., Ohkouchi N., Fukushima T., Kamiya K., Komatsu K., Tomioka N., Kawasaki N., Miura S., Satou T.
Title : , Geochemistry Geophysics Geosystems, 12(10): (2011)
In-situ growth rate of Microcystis spp. and their growth-limiting factors: use of cellular RNA content

Presenter : Nagai T. , Tomioka N., Imai A., Matsushige K.
Title : , Limnology, 12(3):235-243 (2011)
Radiocarbon measurements of dissolved organic carbon in sewage-treatment-plant effluent and domestic sewage

Presenter : Watanabe Nara F. , Imai A., Matsushige K., Komatsu K., Kawasaki N., Shibata Y.
Title : , Nucl.Instrum.Methods Phys.Res.,B, 268(7/8):1142-1145 (2010)
High contribution of recalcitrant organic matter to DOC in a Japanese oligotrophic lake revealed by 14C measurements

Presenter : Nara F,, Imai A., Uchida M., Matsushige K., Komatsu K., Kawasaki N., Shibata Y., Amano K., Mikami H., Hanaishi R.
Title : , Radiocarbon, 52(3):1078-1083 (2010)
Testing the spectral decomposition algorithm(SDA)for different phytoplankton species by a simulation based on tank experiments

Presenter : Oyama Y., Matsushita B., Fukushima T., Chen J., Nagai T., Imai A.
Title : , Int.J.Remote Sens., 31(6):1605-1623 (2010)
Climate control of sulfate influx to Lake Hovsgol, northwest Mongolia, during the last glacial-postglacial transition: Constraints from sulfur geochemistry

Presenter : Nara F. W., Watanabe T., Kakegawa T., Seyama H., Horiuchi K., Nakamura T., Imai A., Kawasaki N., Kawai T.
Title : , Palaeogeogr., Palaeoclimatol., Palaeoecol., 298(3/4):278-285 (2010)
Long-term changes in lake sediments and their influences on lake water quality in Japanese shallow lakes

Presenter : Fukushima T., Kamiya K., Onda Y., Imai A., Matsushige K.
Title : , Fundam.Appl.Limnol.,Arch.Hydrobiol., 177(3):177-188 (2010)
Application of spectral decomposition algorithm for mapping water quality in a turbid lake(Lake Kasumigaura, Japan) from Landsat TM data

Presenter : Oyama Y., Matsushita B., Fukushima.T, Matsushige K., Imai A.
Title : , ISPRS J.Photogramm.Remote Sensing, 64:73-85 (2009)
Stable carbon isotopic characterization of DOC and its humic fraction in Lake kasumigaura,Japan

Presenter : Nara F., Imai A., Matsushige K., Komatsu K.
Title : , Verh.Internat.Verein.Limnol., 30(8):1307-1309 (2009)
Quantification of microcystis in a eutrophic lake by simple DNA extraction and SYBR green real-time PCR

Presenter : Tomioka N., Nagai T., Kawasaki T., Imai A., Matsushige K., Kohata K.
Title : , Microbes Environ., 23(4):306-312 (2008)
Short-term temporal variations in iron concentration and speciation in a canal during a summer algal bloom

Presenter : Nagai T., Imai A., Matsushige K., Yokoi K., Fukushima T.
Title : , Aquat.Sci., 70:388-396 (2008)
A new algorithm for estimating chlorophyll-a concentration from multi-spectral satellite data in case II waters: a simulation based on a controlled laboratory experiment

Presenter : Oyama Y., Matsushita B., Fukushima T., Nagai T., Imai A.
Title : , Int.J.Remote Sensing, 28(7):1437-1453 (2007)

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Spatial and temporal variations in sediment enzyme activities and their relationship with the trophic status of Erhai Lake

Presenter : Zhang L., Wang S., Imai A.
Title : , Ecological Engineering, 75:365-369 (2015)

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Research Result (Presentation)

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Research Presentation
Research Lecture

Research Presentation
Effectiveness of soil extract and its fractions in enhancing the growth of marine microalgae

Presenter : Emi F.H., Komatsu K., Imai A., Onouchi H., Ikram W.M.W.M.Z., Toda T.
Name of Society : 第54回日本水環境学会年会 (2020)
Name of Proceedings : 同予稿集, 309
Research Presentation
Evaluation of the growth promoting effect of dissolved organic matter extracted from soils on microalgae

Presenter : Onouchi H., Komatsu K., Imai A., Hashim E. F., Kawasaki N., Toda T.
Name of Society : IWA Conference on Algal Technologies and Stabilization Ponds for Wastewater Treatment and Resource Recovery IWAlgae 2019 (2019)
Name of Proceedings : Abstracts
Research Presentation
Spatial variations in contributions of methane-derived carbon to chironomid larvae and oligochaeta in a shallow, eutrophic Lake Kasumigaura, Japan

Presenter : Tsuchiya K., Komatsu K., Shinohara R., Imai A., Matsuzaki S., Kohzu A.
Name of Society : ASLO 2019 Aquatic Sciences Meeting (2019)
Name of Proceedings : Abstracts, 75
Research Presentation
Quantification and characterization of dissolved organic matter in natural environments by size exclusion chromatography with total organic carbon detector

Presenter : Shimotori K., Imai A., Sato T., Komatsu K., Kohzu A., Kawasaki N.
Name of Society : NOM7 IWA Specialist Conference on Natural Organic Matter 2019 (2019)
Name of Proceedings : Abstracts
Research Presentation
Changes in Characteristics of NOM During Wastewater Treatment Processes

Presenter : Komatsu K., Onodera T., Kohzu A., Syutsubo K., Imai A.
Name of Society : IWA Specialist Conference on Natural Organic Matter in Water 2019 (2019)
Name of Proceedings : Abstracts
Research Presentation
Characterization of dissolved organic matter (DOM) in domestic wastewaters: DOM-fraction distribution, biodegradability and molecular size distribution

Presenter : Imai A., Satou T., Komatsu K., Kawasaki N., Shimotori K.
Name of Society : IWA Specialist Conference on Natural Organic Matter in Water 2019 (NOM7) (2019)
Name of Proceedings : Abstacts
Research Presentation
Survey of Natural Growth-promoting Substances for High-value Indigenous Microalgae

Presenter : Komatsu K., Kushairi M.R.M., Imai A., Kawasaki N., Onouchi H., Fadzli A., Emi F.H., Sulaiman A.H.H., Zulhairie M.R., Anis Amalina M.A., Ikram W.M.W.M.Z.
Name of Society : 4TH INTERNATIONAL POSTGRADUATE CONFERENCE ON BIOTECHNOLOGY (IPCB 2018) (2018)
Name of Proceedings : Abstracts, 4
Research Presentation
Application of EEM-PARAFAC for characterizing dissolved organic matter in a wastewater treatment plant having four types of advanced treatment processes

Presenter : Komatsu K., Onodera T., Kohzu A., Syutsubo K., Imai A.
Name of Society : International Workshop on Organic Matter Spectroscopy 2018 (2018)
Name of Proceedings : Abstracts
Research Presentation
Bacterial production and carbon budget at the center of Lake Kasumigaura, Japan

Presenter : Tsuchiya K., Sano T., Tomioka N., Takamura N., Nakagawa M., Kohzu A., Komatsu K., Shinohara R., Imai A.
Name of Society : 17th World Lake Conference (2018)
Name of Proceedings : Proceedings, 74-75
Research Presentation
Characterization of dissolved organic matter (DOM) during the processes of advanced wastewater treatment plant and evaluation of the effect of its effluent on river water quality

Presenter : Komatsu K., Onodera T., Kohzu A., Syutsubo K., Imai A., Kawasaki N.
Name of Society : 7th IWA-ASPIRE Conference 2017 (2017)
Name of Proceedings : Abstracts, 20
Research Presentation
Long-term monitoring of Lake Kasumigaura, Japan: a 40 year legacy and looking to the future

Presenter : Matsuzaki S., Komatsu K., Kohzu A., Tomioka N., Shinohara R., Shimotori K., Ueno R., Kondo N., Yamaguchi H., Kadoya T., Ando H., Nakagawa M., Totsu K., Imai A., Takamura N.
Name of Society : Global Lake Ecological Observatory Network (GLEON) 19 (2017)
Name of Proceedings : Abstracts
Research Presentation
Comparison n nutrient and mineral elution between sediment covered with and without macrophyte litter in Lake Biwa, Japan

Presenter : Kohzu A., Imai A., Shimotori K., Sato T., Ishikawa K., Komatsu K., Ban S.
Name of Society : SIL2016 (2016)
Name of Proceedings : Abstracts, 381-382
Research Presentation
Comparison between [15N]-deoxyadenosine method and [3H]-thymidine method for measuring bacterial production in aquatic environments

Presenter : Tsuchiya K., Toda T., Sano T., Tomioka N., Imai A., Kawasaki N., Fukuda H., Hamasaki K., Tada Y., Shimode S.
Name of Society : SIL XXXIII Congress (2016)
Name of Proceedings : Abstracts, 110-111
Research Presentation
Characterization of extracellular dissolved organic matter released by cyanobacteria dominant in a shallow eutrophic lake

Presenter : Imai A., Komatsu K., Sato T., Kawasaki N., Kohzu A., Shimotori K.
Name of Society : SIL XXXIII Congress (2016)
Name of Proceedings : Book of Abstracts, 111-112
Research Presentation
Estimation of primary production in Lake Kasumigaura by using in situ measurement by fast repetition rate fluorometry (FRRF)

Presenter : Komatsu K., Imai A., Tomioka N., Takamura N., Nakagawa M., Sato T., Shimotori K., Kohzu A., Shinohara R.
Name of Society : SIL XXXIII Congress (2016)
Name of Proceedings : Abstracts, 107-108
Research Presentation
Novel lake ecosystem management by sustainable harvesting and effective utilization of aquatic macrophytes biomass; overview for the concept of our on-going project

Presenter : Ban S., Toda T., Ishikawa K., Imai A.
Name of Society : SIL XXXII Congress (2016)
Name of Proceedings : Abstracts, 110
Research Lecture
Long-term changes in nitrogen cycles, water quality and isotopic composition in Lake Kasumigaura, Japan

Presenter : Kohzu A., Komatsu K., Imai A.
Name of Society : ILTER-Nitrogen Initiative International Training Course (2016)
Name of Proceedings : Abstracts
Research Lecture
Characterization of autochthonous dissolved organic matter (DOM) in shallow eutrophic Lake Kasumigaura, Japan: Cyanobacteria-released and sediment-porewater DOMs

Presenter : Imai A.
Name of Society : International Symposium for the 24th Anniversary of World Water Days 2016, Mechanism of Cyanobacterial Bloom Formation and Management Strategies (2016)
Name of Proceedings : Abstracts, 31
Research Presentation
Dynamics of Phosphorus in suspended particles in a shallow eutrophic lake: a 31P NMR study

Presenter : Shinohara R., Imai A., Kohzu A., Tomioka N., Furusato E., Sato T., Sano T., Komatsu K., Miura S., Shimotori K.
Name of Society : American Geophysical Union Fall Meeting 2016 (2016)
Name of Proceedings : -
Research Presentation
Study of soil extracts which may enhance microalgal growth

Presenter : Kawasaki N., Kushairi M., Rajuddin M., Harmin S. A., Ibrahim A. L., Imai A., Komatsu K.
Name of Society : International Conference on Life Sciences Revolution 2016 (2016)
Name of Proceedings : Abstracts, 29-30
Research Presentation
Phosphorus (P) speciation in aquatic macrophytes around Lake Kasumigaura: A 31P NMR study.

Presenter : Shinohara R., Imai A., Komatsu K., Kohzu A., Miura S., Sano T., Sato T., Tomioka N., Shimotori K.
Name of Society : Water and Environment Technology Conference 2015 (2015)
Name of Proceedings : WET2015, 43
Research Presentation
Sedimentation processes observed in Nam Ngum dam reservoir of Laos -A newly generated environment on the bottom in a tropical dam reservoir of the Mekong River Basin-

Presenter : Murata T., Hiroki M., Tomioka N., Yoshida K., Komatsu K., Fukushima M., Imai A., Utsugawa T., Jutagate T., Praxaysombath B.
Name of Society : XIX INQUA (2015)
Name of Proceedings : XIX INQUA 2015
Research Presentation
Sedimentation Processes of Phosphorus in the Catena in Dam Reservoirs in the Mekong River Basin

Presenter : Murata T., Hiroki M., Tomioka N., Nohara S., Yoshida K., Fukushima M., Imai A., Jutagate T., Srean P., Praxaysombath B.
Name of Society : 20th World Congress of Soil Science (2014)
Name of Proceedings : Proceedings of 20th World Congress of Soil Science, (P1-111)
Research Presentation
Temporal and Vertical Changes in Sediment P Compounds in Lake Kasumigaura, Japan - A31 P Nuclear Magnetic Resonance Spectroscopy Study

Presenter : Shinohara R., Imai A., Kawasaki, Komatsu K., Kohzu A., Miura S., Sano T., Sato T., Tomioka N., Shimotori K.
Name of Society : Joint Aquatic Sciences Meeting 2014 (2014)
Name of Proceedings : -
Research Presentation
Characterization of DOM in shallow and deep lakes in Japan by using EEM-PARAFAC

Presenter : Komatsu K., Imai A., Shimotori K., Sato T., Shinohara R., Kohzu A., Tomioka N.
Name of Society : 8th Shallow Lakes Conference (2014)
Name of Proceedings : Abstracts, 145
Research Presentation
Long-term trends in dissolved organic matter, phosphorus and nitrogen in sediment porewater of the shallow eutrophic Lake Kasumigaura, Japan

Presenter : Imai A., Komatsu K., Sato T., Kohzu A., Shinohara R., Tomioka N., Shimotori K.
Name of Society : 8th Shallow Lakes Conference (2014)
Name of Proceedings : Abstracts, 192
Research Presentation
Comparison based on concentration, d15N, and d18O of nitrate to analyze run-off nitrate discharge processes different between two mountain streams around Mt. Tsukuba, Japan

Presenter : Kohzu A., Watanabe Mirai., Hayashi S., Miura S., Imai A.
Name of Society : 3rd International Conference on Nitrification (ICoN3) (2013)
Name of Proceedings : Abstracts, 73-73
Research Presentation
Characterization of dissolved organic matter in sediment porewater of a shallow eutrophic lake

Presenter : Imai A., Komatsu K., Sato T., Kohzu A., Shinohara R.
Name of Society : 32nd Congress of the International Society of Limnology (2013)
Name of Proceedings : Abstracts, 190
Research Presentation
Characterization of dissolved organic matter released by cyanobacteria dominant in a shallow eutrophic lake

Presenter : Imai A., Komatsu K., Sato T., Kawasaki N., Tomioka N., Kohzu A., Shinohara R.
Name of Society : 2013 International Environmental Engineering Conference and Annual Meeting of the Korean Society of Environmental Engineers (IEEC2013) (2013)
Name of Proceedings : -, 43
Research Presentation
Paleoclimatic changes on the southern Tibetan Plateau after the Last Glacial Maximum recorded in Lake Pumoyun Co, and its implication for the Southwest monsoon evolution

Presenter : Matsunaka T., Nishimura M., Watanabe T., Nakamura T., Zhu L., Nara F.W., Imai A., Sasa K., Sueki K., Izutsu Y.
Name of Society : 5th East Asia AMS Symposium (2013)
Name of Proceedings : Abstracts
Research Presentation
Bacterial contribution of organic matter to aquatic environments

Presenter : Imai A., Kawasaki N., Komatsu K., Kohzu A., Sato T., Hamasaki K., Tada Y., Kushairi M.R.
Name of Society : 2012 ASLO Aquatic Sciences Meeting (2012)
Name of Proceedings : -
Research Presentation
Parameterization of chlorophyll a-specific absorption coefficient and effects of their variations in a highly eutrophic lake: A case study of Lake Kasumigaura, Japan

Presenter : Imai A., Yoshimura K., Zaitsu N., Sekimura Y., Matsushita B., Fukushima T.
Name of Society : 2012 ASLO Aquatic Sciences Meeting (2012)
Name of Proceedings : -
Research Presentation
Fast response to bacteria to Typhoon Malou passage in the coastal waters of Sagami Bay, Japan

Presenter : Imai A., Tsuchiya K., Nakajima R., Kuwahara V.S., Hamasaki K., Tada Y., Kikuchi T., Toda T.
Name of Society : 2012 ASLO Aquatic Sciences Meeting (2012)
Name of Proceedings : -
Research Presentation
Metabolism in forest ecosystems from the analysis of nitrate 15N and 18O natural abundances in mountaion streams around Mt. Tsukuba, Japan

Presenter : Kohzu A., Watanabe Mirai., Hayashi S., Imai A., Nakajima Y., Osaka K., Miura S.
Name of Society : Voyages of Discovery (2012)
Name of Proceedings : Abstracts, 65
Research Presentation
Ecological niche separation in the Polynucleobacter subclusters linked to quality of dissolved organic matter

Presenter : Watanabe K. , Imai A., Watanabe Mirai., Yamamura S., Hayashi S.
Name of Society : 2012 ASLO Aquatic Science Meeting (2012)
Name of Proceedings : Abstracts, 42
Research Presentation
Phosphorus compounds of suspended particles and sediment in Lake Kasumigaura —A 31P NMR study

Presenter : Shinohara R. , Imai A., Kawasaki N., Komatsu K., Kohzu A., Miura S., Sato T., Tomioka N.
Name of Society : 2012 ASLO Aquatic Sciences Meeting (2012)
Name of Proceedings : Abstracts
Research Presentation
An analysis of temporal dynamics of Microcystis aeruginosa in eutrophic Lake Kasumigaura by real-time PCR

Presenter : Tomioka N., Imai A., Komatsu K., Fukushima M.
Name of Society : International Symposium on Microcystis Studies from Asia (2011)
Name of Proceedings : Abstract of International Symposium on Microcystis Studies from Asia, 35
Research Presentation
The introduction of the denitrifier method for the analysis of nitrate delta15N and delta18O and their variation in the surface water of Lake Kasumigaura from 2000 to 2005

Presenter : Kohzu A., Imai A., Nakajima Y., Osaka K., Komatsu K., Kawasaki N., Miura S., Sato T.
Name of Society : The 4th IWA-ASPIRE Conference & Exhibition (2011)
Name of Proceedings : Abstract of The 4th IWA-ASPIRE Conference & Exhibition Toward sustainable water supply and recycling systems, 256
Research Presentation
Seasonal Dynamics of Microcystis aeruginosa in Eutrophic Lake Kasumigaura

Presenter : Tomioka N., Imai A., Komatsu K.
Name of Society : The 4th IWA-ASPIRE Conference & Exhibition (2011)
Name of Proceedings : Abstracts of The 4th IWA-ASPIRE Conference & Exhibition Toward sustainable water supply and recycling systems, 522-523
Research Presentation
Distribution Patterns of Dissloved Carbohydrates in Eutrophic Lake Kasumigaura

Presenter : Sato T., Kawasaki N., Komatsu K., Imai A., Kohzu A., Miura S.
Name of Society : The 4th IWA-ASPIRE Conference and Exhibition Toward sustainable water supply and recycling systems (2011)
Name of Proceedings : Abstract of The 4th IWA-ASPIRE Conference and Exhibition Toward sustainable water supply and recycling systems, 466
Research Presentation
Characterization of dissolved organic matter in water reclamation process

Presenter : Komatsu K., Imai A., Yonekawa H., Hashimoto T., Kawasaki N., Sato T., Kohzu A.
Name of Society : The 4th IWA-ASPIRE Conference and exhibition (2011)
Name of Proceedings : Abstracts, 192-193
Research Presentation
Seasonal changes of dissolved organic matter properties in Lake Kasumigaura and its sediment pore water using size-exclusion chromatography with both UV and TOC detectors

Presenter : Kawasaki N., Imai A., Komatsu K., Kohzu A., Sato T., Miura S.
Name of Society : The 4th IWA-ASPIRE Conference and exhibition (2011)
Name of Proceedings : Abstracts of The 4th IWA-ASPIRE Conference and exhibition, 120-121
Research Presentation
Historical change in nitrogen isotope ratios of sediments in Lake Kasumigaura during 1979-2007

Presenter : Kohzu A., Imai A., Matsushige K., Kazuhiro K., Kawasaki N., Fukushima T.
Name of Society : 7th Int.Symp.Subsurface Microbiol. (2008)
Name of Proceedings : Abstracts, 93
Research Presentation
Stable corbon isotopic characterization of DOC and its humic fraction in Lake Kasumigaura,Japan

Presenter : IMAI Akio,
Name of Society : 30th Congr.Int.Assoc.Theor.Appl.Limnol. (2007)
Name of Proceedings : Program, (42)
Research Presentation
Change of sulfur accumulation in Lake Hovsgol sediments(cores X104 and X106) during the last 23,000 years

Presenter : Nara F., Watanabe T.(*1), Horiuchi K.(*2), Imai A., Seyama H., Nakamura T.(*1), Kawai T.(*1)
Name of Society : 5th Int.Symp.Terr.Environ.Changes East Eurasia Adjacent Areas (2007)
Name of Proceedings : Abstracts
Research Presentation
Seasonal variation of dissolved organic carbon in a lacustirne environment(Lake Kasumigaura,Japan),revealed by dual isotopic(delta14C and delta13C) measurements

Presenter : , IMAI Akio,
Name of Society : 19th Int.Radiocarbon Conf.(Poster Session) (2006)
Name of Proceedings : Abstracts
Research Presentation
Application of 14C measurements for isotopic characterization of dissolved organic carbon(DOC) in lake water

Presenter : Nara F., Imai A., Matsushige K., Komatsu K., Shibata Y.
Name of Society : 9th Symp.Jpn.AMS Soc. (2006)
Name of Proceedings : Abstracts
Research Presentation
Application of 14C measurements for isotopic characterization of dissolved organic carbon in lake water

Presenter : Nara F., Imai A., Matsushige K., Komatsu K., Shibata Y.
Name of Society : 9th Symp.Jpn.AMS Soc.Prospects New Front.Earth Environ.Sci. (2006)
Name of Proceedings : Abstracts
Research Presentation
Change of carbon and nitrogen isotopic compositions in an AMS 14C dated sediemnt of Lake Hovsgol(Mongolia)

Presenter : IMAI Akio
Name of Society : 10th Int.Conf.Accel.Mass Spectrom. (2005)
Name of Proceedings : Abstracts
Research Presentation
Limiting nurtients on the growth of bloom-forming Cyanobacteria with special focus on iron speciation

Presenter : IMAI Akio,
Name of Society : Int.Assoc.Theor.Appl.Limnol.(SIL) 29 Congr. (2004)
Name of Proceedings : Abstracts
Research Presentation
Why has Lake Kasumigaura changed to such a turbid Lake-

Presenter : Fukushima T.(*1), Kawamura S.(*1), Seki T.(*1), Onda Y.(*1), Imai A., Matsushige K.
Name of Society : Int.Assoc.Theor.Appl.Limnol.(SIL) 29 Congr. (2004)
Name of Proceedings : Abstracts
Research Presentation
Characterization of dissolved organic matter in shallow eutrophic Lake Kasumigaura

Presenter : Imai A., Matsushige K.
Name of Society : 2nd Int.Workshop Water Dynamics (2004)
Name of Proceedings : Proceedings
Research Presentation
Characterization of dissolved organic matter in shallow eutrophic Lake Kasumigaura

Presenter : IMAI Akio,
Name of Society : ASLO 2002 Summer Meet.:Inter-disciplinary Linkages Aquat.Sci.Beyond (2002)
Name of Proceedings : Abstracts, 59

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Effectiveness of soil extract and its fractions in enhancing the growth of marine microalgae

Presenter : Emi F.H., Komatsu K., Imai A., Onouchi H., Ikram W.M.W.M.Z., Toda T.
Name of Society : 第54回日本水環境学会年会 (2020)
Name of Proceedings : 同予稿集, 309
Evaluation of the growth promoting effect of dissolved organic matter extracted from soils on microalgae

Presenter : Onouchi H., Komatsu K., Imai A., Hashim E. F., Kawasaki N., Toda T.
Name of Society : IWA Conference on Algal Technologies and Stabilization Ponds for Wastewater Treatment and Resource Recovery IWAlgae 2019 (2019)
Name of Proceedings : Abstracts
Changes in Characteristics of NOM During Wastewater Treatment Processes

Presenter : Komatsu K., Onodera T., Kohzu A., Syutsubo K., Imai A.
Name of Society : IWA Specialist Conference on Natural Organic Matter in Water 2019 (2019)
Name of Proceedings : Abstracts
Characterization of dissolved organic matter (DOM) in domestic wastewaters: DOM-fraction distribution, biodegradability and molecular size distribution

Presenter : Imai A., Satou T., Komatsu K., Kawasaki N., Shimotori K.
Name of Society : IWA Specialist Conference on Natural Organic Matter in Water 2019 (NOM7) (2019)
Name of Proceedings : Abstacts
Survey of Natural Growth-promoting Substances for High-value Indigenous Microalgae

Presenter : Komatsu K., Kushairi M.R.M., Imai A., Kawasaki N., Onouchi H., Fadzli A., Emi F.H., Sulaiman A.H.H., Zulhairie M.R., Anis Amalina M.A., Ikram W.M.W.M.Z.
Name of Society : 4TH INTERNATIONAL POSTGRADUATE CONFERENCE ON BIOTECHNOLOGY (IPCB 2018) (2018)
Name of Proceedings : Abstracts, 4
Application of EEM-PARAFAC for characterizing dissolved organic matter in a wastewater treatment plant having four types of advanced treatment processes

Presenter : Komatsu K., Onodera T., Kohzu A., Syutsubo K., Imai A.
Name of Society : International Workshop on Organic Matter Spectroscopy 2018 (2018)
Name of Proceedings : Abstracts
Characterization of dissolved organic matter (DOM) during the processes of advanced wastewater treatment plant and evaluation of the effect of its effluent on river water quality

Presenter : Komatsu K., Onodera T., Kohzu A., Syutsubo K., Imai A., Kawasaki N.
Name of Society : 7th IWA-ASPIRE Conference 2017 (2017)
Name of Proceedings : Abstracts, 20
Comparison n nutrient and mineral elution between sediment covered with and without macrophyte litter in Lake Biwa, Japan

Presenter : Kohzu A., Imai A., Shimotori K., Sato T., Ishikawa K., Komatsu K., Ban S.
Name of Society : SIL2016 (2016)
Name of Proceedings : Abstracts, 381-382
Comparison between [15N]-deoxyadenosine method and [3H]-thymidine method for measuring bacterial production in aquatic environments

Presenter : Tsuchiya K., Toda T., Sano T., Tomioka N., Imai A., Kawasaki N., Fukuda H., Hamasaki K., Tada Y., Shimode S.
Name of Society : SIL XXXIII Congress (2016)
Name of Proceedings : Abstracts, 110-111
Characterization of extracellular dissolved organic matter released by cyanobacteria dominant in a shallow eutrophic lake

Presenter : Imai A., Komatsu K., Sato T., Kawasaki N., Kohzu A., Shimotori K.
Name of Society : SIL XXXIII Congress (2016)
Name of Proceedings : Book of Abstracts, 111-112
Estimation of primary production in Lake Kasumigaura by using in situ measurement by fast repetition rate fluorometry (FRRF)

Presenter : Komatsu K., Imai A., Tomioka N., Takamura N., Nakagawa M., Sato T., Shimotori K., Kohzu A., Shinohara R.
Name of Society : SIL XXXIII Congress (2016)
Name of Proceedings : Abstracts, 107-108
Novel lake ecosystem management by sustainable harvesting and effective utilization of aquatic macrophytes biomass; overview for the concept of our on-going project

Presenter : Ban S., Toda T., Ishikawa K., Imai A.
Name of Society : SIL XXXII Congress (2016)
Name of Proceedings : Abstracts, 110
Study of soil extracts which may enhance microalgal growth

Presenter : Kawasaki N., Kushairi M., Rajuddin M., Harmin S. A., Ibrahim A. L., Imai A., Komatsu K.
Name of Society : International Conference on Life Sciences Revolution 2016 (2016)
Name of Proceedings : Abstracts, 29-30
Characterization of DOM in shallow and deep lakes in Japan by using EEM-PARAFAC

Presenter : Komatsu K., Imai A., Shimotori K., Sato T., Shinohara R., Kohzu A., Tomioka N.
Name of Society : 8th Shallow Lakes Conference (2014)
Name of Proceedings : Abstracts, 145
Characterization of dissolved organic matter in sediment porewater of a shallow eutrophic lake

Presenter : Imai A., Komatsu K., Sato T., Kohzu A., Shinohara R.
Name of Society : 32nd Congress of the International Society of Limnology (2013)
Name of Proceedings : Abstracts, 190
Characterization of dissolved organic matter released by cyanobacteria dominant in a shallow eutrophic lake

Presenter : Imai A., Komatsu K., Sato T., Kawasaki N., Tomioka N., Kohzu A., Shinohara R.
Name of Society : 2013 International Environmental Engineering Conference and Annual Meeting of the Korean Society of Environmental Engineers (IEEC2013) (2013)
Name of Proceedings : -, 43
Paleoclimatic changes on the southern Tibetan Plateau after the Last Glacial Maximum recorded in Lake Pumoyun Co, and its implication for the Southwest monsoon evolution

Presenter : Matsunaka T., Nishimura M., Watanabe T., Nakamura T., Zhu L., Nara F.W., Imai A., Sasa K., Sueki K., Izutsu Y.
Name of Society : 5th East Asia AMS Symposium (2013)
Name of Proceedings : Abstracts
Bacterial contribution of organic matter to aquatic environments

Presenter : Imai A., Kawasaki N., Komatsu K., Kohzu A., Sato T., Hamasaki K., Tada Y., Kushairi M.R.
Name of Society : 2012 ASLO Aquatic Sciences Meeting (2012)
Name of Proceedings : -
Fast response to bacteria to Typhoon Malou passage in the coastal waters of Sagami Bay, Japan

Presenter : Imai A., Tsuchiya K., Nakajima R., Kuwahara V.S., Hamasaki K., Tada Y., Kikuchi T., Toda T.
Name of Society : 2012 ASLO Aquatic Sciences Meeting (2012)
Name of Proceedings : -
Phosphorus compounds of suspended particles and sediment in Lake Kasumigaura —A 31P NMR study

Presenter : Shinohara R. , Imai A., Kawasaki N., Komatsu K., Kohzu A., Miura S., Sato T., Tomioka N.
Name of Society : 2012 ASLO Aquatic Sciences Meeting (2012)
Name of Proceedings : Abstracts
The introduction of the denitrifier method for the analysis of nitrate delta15N and delta18O and their variation in the surface water of Lake Kasumigaura from 2000 to 2005

Presenter : Kohzu A., Imai A., Nakajima Y., Osaka K., Komatsu K., Kawasaki N., Miura S., Sato T.
Name of Society : The 4th IWA-ASPIRE Conference & Exhibition (2011)
Name of Proceedings : Abstract of The 4th IWA-ASPIRE Conference & Exhibition Toward sustainable water supply and recycling systems, 256
Characterization of dissolved organic matter in water reclamation process

Presenter : Komatsu K., Imai A., Yonekawa H., Hashimoto T., Kawasaki N., Sato T., Kohzu A.
Name of Society : The 4th IWA-ASPIRE Conference and exhibition (2011)
Name of Proceedings : Abstracts, 192-193
Seasonal changes of dissolved organic matter properties in Lake Kasumigaura and its sediment pore water using size-exclusion chromatography with both UV and TOC detectors

Presenter : Kawasaki N., Imai A., Komatsu K., Kohzu A., Sato T., Miura S.
Name of Society : The 4th IWA-ASPIRE Conference and exhibition (2011)
Name of Proceedings : Abstracts of The 4th IWA-ASPIRE Conference and exhibition, 120-121
Stable corbon isotopic characterization of DOC and its humic fraction in Lake Kasumigaura,Japan

Presenter : IMAI Akio,
Name of Society : 30th Congr.Int.Assoc.Theor.Appl.Limnol. (2007)
Name of Proceedings : Program, (42)
Change of sulfur accumulation in Lake Hovsgol sediments(cores X104 and X106) during the last 23,000 years

Presenter : Nara F., Watanabe T.(*1), Horiuchi K.(*2), Imai A., Seyama H., Nakamura T.(*1), Kawai T.(*1)
Name of Society : 5th Int.Symp.Terr.Environ.Changes East Eurasia Adjacent Areas (2007)
Name of Proceedings : Abstracts
Seasonal variation of dissolved organic carbon in a lacustirne environment(Lake Kasumigaura,Japan),revealed by dual isotopic(delta14C and delta13C) measurements

Presenter : , IMAI Akio,
Name of Society : 19th Int.Radiocarbon Conf.(Poster Session) (2006)
Name of Proceedings : Abstracts
Application of 14C measurements for isotopic characterization of dissolved organic carbon(DOC) in lake water

Presenter : Nara F., Imai A., Matsushige K., Komatsu K., Shibata Y.
Name of Society : 9th Symp.Jpn.AMS Soc. (2006)
Name of Proceedings : Abstracts
Application of 14C measurements for isotopic characterization of dissolved organic carbon in lake water

Presenter : Nara F., Imai A., Matsushige K., Komatsu K., Shibata Y.
Name of Society : 9th Symp.Jpn.AMS Soc.Prospects New Front.Earth Environ.Sci. (2006)
Name of Proceedings : Abstracts
Change of carbon and nitrogen isotopic compositions in an AMS 14C dated sediemnt of Lake Hovsgol(Mongolia)

Presenter : IMAI Akio
Name of Society : 10th Int.Conf.Accel.Mass Spectrom. (2005)
Name of Proceedings : Abstracts
Limiting nurtients on the growth of bloom-forming Cyanobacteria with special focus on iron speciation

Presenter : IMAI Akio,
Name of Society : Int.Assoc.Theor.Appl.Limnol.(SIL) 29 Congr. (2004)
Name of Proceedings : Abstracts
Why has Lake Kasumigaura changed to such a turbid Lake-

Presenter : Fukushima T.(*1), Kawamura S.(*1), Seki T.(*1), Onda Y.(*1), Imai A., Matsushige K.
Name of Society : Int.Assoc.Theor.Appl.Limnol.(SIL) 29 Congr. (2004)
Name of Proceedings : Abstracts
Characterization of dissolved organic matter in shallow eutrophic Lake Kasumigaura

Presenter : Imai A., Matsushige K.
Name of Society : 2nd Int.Workshop Water Dynamics (2004)
Name of Proceedings : Proceedings
Characterization of dissolved organic matter in shallow eutrophic Lake Kasumigaura

Presenter : IMAI Akio,
Name of Society : ASLO 2002 Summer Meet.:Inter-disciplinary Linkages Aquat.Sci.Beyond (2002)
Name of Proceedings : Abstracts, 59
Spatial variations in contributions of methane-derived carbon to chironomid larvae and oligochaeta in a shallow, eutrophic Lake Kasumigaura, Japan

Presenter : Tsuchiya K., Komatsu K., Shinohara R., Imai A., Matsuzaki S., Kohzu A.
Name of Society : ASLO 2019 Aquatic Sciences Meeting (2019)
Name of Proceedings : Abstracts, 75
Quantification and characterization of dissolved organic matter in natural environments by size exclusion chromatography with total organic carbon detector

Presenter : Shimotori K., Imai A., Sato T., Komatsu K., Kohzu A., Kawasaki N.
Name of Society : NOM7 IWA Specialist Conference on Natural Organic Matter 2019 (2019)
Name of Proceedings : Abstracts
Bacterial production and carbon budget at the center of Lake Kasumigaura, Japan

Presenter : Tsuchiya K., Sano T., Tomioka N., Takamura N., Nakagawa M., Kohzu A., Komatsu K., Shinohara R., Imai A.
Name of Society : 17th World Lake Conference (2018)
Name of Proceedings : Proceedings, 74-75
Long-term monitoring of Lake Kasumigaura, Japan: a 40 year legacy and looking to the future

Presenter : Matsuzaki S., Komatsu K., Kohzu A., Tomioka N., Shinohara R., Shimotori K., Ueno R., Kondo N., Yamaguchi H., Kadoya T., Ando H., Nakagawa M., Totsu K., Imai A., Takamura N.
Name of Society : Global Lake Ecological Observatory Network (GLEON) 19 (2017)
Name of Proceedings : Abstracts
Dynamics of Phosphorus in suspended particles in a shallow eutrophic lake: a 31P NMR study

Presenter : Shinohara R., Imai A., Kohzu A., Tomioka N., Furusato E., Sato T., Sano T., Komatsu K., Miura S., Shimotori K.
Name of Society : American Geophysical Union Fall Meeting 2016 (2016)
Name of Proceedings : -
Phosphorus (P) speciation in aquatic macrophytes around Lake Kasumigaura: A 31P NMR study.

Presenter : Shinohara R., Imai A., Komatsu K., Kohzu A., Miura S., Sano T., Sato T., Tomioka N., Shimotori K.
Name of Society : Water and Environment Technology Conference 2015 (2015)
Name of Proceedings : WET2015, 43
Sedimentation processes observed in Nam Ngum dam reservoir of Laos -A newly generated environment on the bottom in a tropical dam reservoir of the Mekong River Basin-

Presenter : Murata T., Hiroki M., Tomioka N., Yoshida K., Komatsu K., Fukushima M., Imai A., Utsugawa T., Jutagate T., Praxaysombath B.
Name of Society : XIX INQUA (2015)
Name of Proceedings : XIX INQUA 2015
Sedimentation Processes of Phosphorus in the Catena in Dam Reservoirs in the Mekong River Basin

Presenter : Murata T., Hiroki M., Tomioka N., Nohara S., Yoshida K., Fukushima M., Imai A., Jutagate T., Srean P., Praxaysombath B.
Name of Society : 20th World Congress of Soil Science (2014)
Name of Proceedings : Proceedings of 20th World Congress of Soil Science, (P1-111)
Temporal and Vertical Changes in Sediment P Compounds in Lake Kasumigaura, Japan - A31 P Nuclear Magnetic Resonance Spectroscopy Study

Presenter : Shinohara R., Imai A., Kawasaki, Komatsu K., Kohzu A., Miura S., Sano T., Sato T., Tomioka N., Shimotori K.
Name of Society : Joint Aquatic Sciences Meeting 2014 (2014)
Name of Proceedings : -
Long-term trends in dissolved organic matter, phosphorus and nitrogen in sediment porewater of the shallow eutrophic Lake Kasumigaura, Japan

Presenter : Imai A., Komatsu K., Sato T., Kohzu A., Shinohara R., Tomioka N., Shimotori K.
Name of Society : 8th Shallow Lakes Conference (2014)
Name of Proceedings : Abstracts, 192
Comparison based on concentration, d15N, and d18O of nitrate to analyze run-off nitrate discharge processes different between two mountain streams around Mt. Tsukuba, Japan

Presenter : Kohzu A., Watanabe Mirai., Hayashi S., Miura S., Imai A.
Name of Society : 3rd International Conference on Nitrification (ICoN3) (2013)
Name of Proceedings : Abstracts, 73-73
Parameterization of chlorophyll a-specific absorption coefficient and effects of their variations in a highly eutrophic lake: A case study of Lake Kasumigaura, Japan

Presenter : Imai A., Yoshimura K., Zaitsu N., Sekimura Y., Matsushita B., Fukushima T.
Name of Society : 2012 ASLO Aquatic Sciences Meeting (2012)
Name of Proceedings : -
Metabolism in forest ecosystems from the analysis of nitrate 15N and 18O natural abundances in mountaion streams around Mt. Tsukuba, Japan

Presenter : Kohzu A., Watanabe Mirai., Hayashi S., Imai A., Nakajima Y., Osaka K., Miura S.
Name of Society : Voyages of Discovery (2012)
Name of Proceedings : Abstracts, 65
Ecological niche separation in the Polynucleobacter subclusters linked to quality of dissolved organic matter

Presenter : Watanabe K. , Imai A., Watanabe Mirai., Yamamura S., Hayashi S.
Name of Society : 2012 ASLO Aquatic Science Meeting (2012)
Name of Proceedings : Abstracts, 42
An analysis of temporal dynamics of Microcystis aeruginosa in eutrophic Lake Kasumigaura by real-time PCR

Presenter : Tomioka N., Imai A., Komatsu K., Fukushima M.
Name of Society : International Symposium on Microcystis Studies from Asia (2011)
Name of Proceedings : Abstract of International Symposium on Microcystis Studies from Asia, 35
Seasonal Dynamics of Microcystis aeruginosa in Eutrophic Lake Kasumigaura

Presenter : Tomioka N., Imai A., Komatsu K.
Name of Society : The 4th IWA-ASPIRE Conference & Exhibition (2011)
Name of Proceedings : Abstracts of The 4th IWA-ASPIRE Conference & Exhibition Toward sustainable water supply and recycling systems, 522-523
Distribution Patterns of Dissloved Carbohydrates in Eutrophic Lake Kasumigaura

Presenter : Sato T., Kawasaki N., Komatsu K., Imai A., Kohzu A., Miura S.
Name of Society : The 4th IWA-ASPIRE Conference and Exhibition Toward sustainable water supply and recycling systems (2011)
Name of Proceedings : Abstract of The 4th IWA-ASPIRE Conference and Exhibition Toward sustainable water supply and recycling systems, 466
Historical change in nitrogen isotope ratios of sediments in Lake Kasumigaura during 1979-2007

Presenter : Kohzu A., Imai A., Matsushige K., Kazuhiro K., Kawasaki N., Fukushima T.
Name of Society : 7th Int.Symp.Subsurface Microbiol. (2008)
Name of Proceedings : Abstracts, 93

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Long-term changes in nitrogen cycles, water quality and isotopic composition in Lake Kasumigaura, Japan

Presenter : Kohzu A., Komatsu K., Imai A.
Name of Society : ILTER-Nitrogen Initiative International Training Course (2016)
Name of Proceedings : Abstracts
Characterization of autochthonous dissolved organic matter (DOM) in shallow eutrophic Lake Kasumigaura, Japan: Cyanobacteria-released and sediment-porewater DOMs

Presenter : Imai A.
Name of Society : International Symposium for the 24th Anniversary of World Water Days 2016, Mechanism of Cyanobacterial Bloom Formation and Management Strategies (2016)
Name of Proceedings : Abstracts, 31

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IMAI Akio

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