• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Micro-scale analysis of the environmental factors in the bottom sediments of Lake Biwa

Research Project

Project/Area Number 07680566
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Environmental dynamic analysis
Research InstitutionRitsumeikan University

Principal Investigator

MORISAKI Hisao  Ritsumeikan Univ., Depart.Sci.Engineering, Associate Professor, 理工学部, 助教授 (50125671)

Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1996: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1995: ¥1,200,000 (Direct Cost: ¥1,200,000)
KeywordsLake Biwa / Bottom sediment / Microbial flora / Oligotrophs / Minerilization activity / Growth rate / Aerobes / Facultative anaerobes / 微生物 / 環境因子 / 環境浄化
Research Abstract

The bottom sediments, sampled at several sites in Northern and Southrn basin of Lake Biwa, were separated according to their depth (0-1,2-3,5-6,9-10cm) from its surface. The microbial flora in the sediments were investigated by counting colonies formed on agar plates of a nutrient broth and a diluted nutrient broth agar medium. The activity of the sediments to decompose organic substances (minerilization activity), supposed to relate a remediation activity of the sediments, were investigated by measuring the ^<14>CO_2 production when ^<14>C-labeled glucose was added to the sediments.
Followings were observed concerning the microbial flora, 1) the number of oligotrophic microbes were greater than that of eutrophic ones, 2) In the deeper sediments less aerobes were found (especially in summer), 3) in the Northern basin slow-growing microbes were major, contrary to this 4) in the Southern basin fast-growing microbes were major.
The activity to decompose organic substance (glucose) were similar between the sediments in the Northern basin and that in the Southern basin, despite the difference in the number of microbes. Many more facultative anaerobes in the Northern basin compared with the Southern basin seemed to produce much more CO_2.
In the layr of sediments from 0 to 10mm deep, almost all the microbes were aerobes. The number of microbes in the layr from 0 to 1mm changed greatly in different seasons.
In a related research, the number of microbes resistant to various antibiotics were investigated. The ratio of the resistant microbes were greater in the deeper sediments. Some progress was made in the relevant studies such as the development of a system to measure the microbial attachment force, the analysis of the polymer structure at microbial cells and its relation with the cell attachment.

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] 森崎久雄: "微生物の住み場所-界面" 表面. 33. 622-627 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Hisao Morisaki: "Biofilm in Microbial Ecology-Early Stage of Biofilm Formation-" Microbes and Environments. 11. 25-32 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Shinichi Takashima: "Surface characteristics of the microbial cell of Pseudomonas syringae and its relevance with cell attachment" Colloids and Surfaces B:Biointerfaces. (accepted). (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Hisao Morisaki: "Microbial habitats-Interfaces" Hyoumen (Surfaces). 33. 622-627 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Hisao Morisaki: "Biofilm in Microbial Ecology-Early Stage of Biofilm Formation-" Microbes and Environments. 11. 25-32 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Shinichi Takashima and Hisao Morisaki: "Surface Characteristics of the microbial cell of Pseudomonas syringae and its relevance with cell attachment" Colloids and Surfaces B : Biointerfaces. (accepted). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 森崎 久雄: "微生物の住み場所-界面" 表面. 33(10). 622-627 (1995)

    • Related Report
      1996 Annual Research Report
  • [Publications] Hisao Morisaki: "Biofilm in Microbial Ecology-Early Stage of Biofilm Formation-" Microbes and Environments. 11(1). 25-32 (1996)

    • Related Report
      1996 Annual Research Report

URL: 

Published: 1995-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi