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Environmental Technology Research Network
in the Asia-Pacific Region

DB for Research Project
Category(1) : Water
Category(2) : Modeling


  1. Project Name
  2. Duration
  3. Research Catagory 1
  4. Research Catagory 2
  5. Research Field
  6. Researchers
  7. Affiliation 1
  8. Affiliation 2
  9. Address
  10. Country
  11. Phone
  12. Fax
  13. Project Summary
  14. Publications
  15. International Joint Study with

Indian Institute of Technology(IIT),India

  1. Numerical Modelling of Salinity Intrusion in the Hooghly Estuary
  2. 1993-1996
  3. pollutant dispersal, water
  4. counter measures, circulation and mixing, modeling
  5. coastal oceanography, chemistry
  6. SINHA P.C., DUBE S.K., RAO A.D.
  7. Centre for Atmospheric Sciences
  8. Indian Institute of Technology, New Delhi
  9. IIT, Hauz Khas, New Delhi-110016
  10. India
  11. 91-11-663642
  12. 91-11-6862037
  13. Numerical modelling of tidal circulation, salinity intrusion and pollutant and sediment transport are studied in a coastal water body, and their mixing processes as well as physical properties are elucidated.
  14. 1) P.C. Sinha et al., A mathematical Model & Tidal Circulation in Estuaries, Nonlinear World, 1995, 257-273.
    2) P.C. Sinha et al., Numerical Modelling of Circulation and Salinity Intrusion in Hooghly Estuary, 1996.

National Institute for Resources and Environment(NIRE), Japan

  1. Japanese Study on the Behavior of Greenhouse Gases and Aerosols
  2. 1990-1999
  3. global change, air, water, ocean
  4. counter measures, reaction mechanism, measurement, monitoring, modeling
  5. chemistry, geophysics
  6. Takashi IBUSUKI, Koji TAKEUCHI, Shuzo KUTSUNA, Kazuhide KOIKE, Hitomi KOBARA
  7. Photoenergy Application Div., Global Warming Control Dept.
  8. NIRE, AIST, MITI
  9. 16-3 Onogawa, Tsukuba, Ibaraki 305
  10. Japan
  11. 81-298-61-8168
  12. 81-298-61-8158
  13. This project aims at conducting research and observation on long-term trend of greenhouse materials and on the material circulation and quantitative analysis of natural balance in order to estimate and predict influence of anthropogenic and natural greenhouse gases.
  1. Sequence of the gene encoding a subunit of ammonia mono-oxygenase,amoa, from a (NH4)2SO4-sensitive ammonia-oxidizing bacteria isolated from activated sludge.
  2. 1994-
  3. water
  4. ammonia-oxidizing bacteria, ammonia monooxygenase, DNA, reaction mechanism, modeling
  5. engineering, microbiology, molecular biology
  6. Yuichi SUWA1, Kazuhiko NOTO2, Tatsuo SUMINO2, and Yoshikuni URUSHIGAWA1
  7. Ecological Chemistry and Microbilogy Div., Hydroshperic Environmental Protection Dept.
  8. NIRE, AIST, MITI; Hitachi Plant Engineering and Construction Co. Ltd.,
  9. 16-3 Onogawa, Tsukuba, Ibaraki, 305
  10. JAPAN, U.S.A.
  11. 81-298-61-8318
  12. 81-298-61-8309
  13. Ammonia oxidizers play a key role in the global nitrogen cycle because they are solely responsible for oxidizing ammonia to nitrite. The ammonia oxidation is due to ammonia monooxygenase, Amo. Most of the previously described ammonia oxidizers are reportedly insensitive to ammonia toxicity. However, we have shown that (NH4)2SO4-sensitive ammonia oxidizers predominate in many waste water treatment facilities. Further, growth kinetics showed that sensitive strains have lower Km value with respect to the substrate. The aim of this study is to examine thedifferences between the amoa gene in substrate-sensitive and insensitive strains. Strain JL21 was isolated from a laboratory activated sludge and shown to grow on up to 5-10 mM (NH4)2SO4, whereas four ATCC ammonia oxidizing strains, two each of Nitrosomonas and Nitrosolobus strains, tolerated 35 mM (NH4)2SO4. The 16SrDNA sequence of JL21 was more similar to Nitrosolobus and Nitrosospira spp. than Nitrosomonas spp., which might indicate a unique phylogenetic position for the strain. A whole ammonia monooxygenase a gene (amoa) from JL21 was PCR-amplified and sequenced. It was shown that 76% of the nucleotide sequence was identical to that reported for Nitrosomonas europaea. Comparing amino acid sequences from these two strains, 83% identity was found. The result indicates that the Amoa sequence could be well-conserved regardless of sensitivity to the energy source.
  14. Abstr. 96th Gen. Meet. Am. Soc. Microbiol.
  1. Behaviors of Synthetic Organic Compounds in Coastal Environment
  2. 1987-1991
  3. water, hazardous substances, others
  4. fate, modeling
  5. chemistry, biology, physics
  6. Kisaburo NAKATA, Fumio HORIGU,Shigeki MASUNAGA, Manabu FUKUI, Yoshitaka YONEZAWA,
  7. Marin Environment Div. of Environmental Assessment Dept. and Ecological Chemistry and MicrobilogyDiv. Hydroshperic Environmental Protection Dept.
  8. NIRE, AIST, MITI
  9. 16-3 Onogawa, Tsukuba, Ibaraki, 305
  10. JAPAN
  11. 81-298-61-8311
  12. 81-298-61-8309
  13. In order to develop a mnumerical model estimating the behavior of discharged pollutants to coastal environment, we survayed distributions and behaviors of chlrobenzens and butyltins in Ise Bay. Their distribution patterns in the surface sediment were explained by the following effects: the distance from the source, the horizontal transport caused by the river inflows, and the sedimentation caused by downward water flow. The transportation of the pollutants from surface water to bottom sediment was explained by the process of their absorption to suspended matter and their settling on suspended matter.
  14. 1) The distribution of chlorobenzenes in the bottom sediment of Ise Bay. 1991. Masunaga, S., Y. Yonezawa, and Y.Urushigawa. Water Res. 25:275-288.
    2) The Behavior of chlorobenzenes in Ise Bay, estimeted from their concentration in various environmental media. 1991. Masunaga, S., Y. Yonezawa and Y. Urushigawa. Water Res. 25:289-297
    3) Distribution of Butyltins in the surface sediment of Ise Bay, Japan. Yonezawa, Y., K. Nakata, Y. Miyakozawa, A. Ochi, T. Kowata, H. Fukawa, Y. Sato, S. Masunaga and Y. Urushigawa. 1993. Environ. Toxicol. and Chem. 12:1175-1184
    4) Partitioning of chlorobenzenes between suspended particulate and water in coastal waters. Masunaga, S., Yonezawa, Y., Fukui, M., Urushigawa, Y. J. Environ. Sci. & Health 1996. A31(4):887-903