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

Microbial metabolic processes that control the dynamics of high-molecular-weight dissolved organic matter in the ocean

Research Project

Project/Area Number 06680489
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Environmental dynamic analysis
Research InstitutionOcean Research Institute, University of Tokyo (1995)
Nagoya University (1994)

Principal Investigator

NAGATA Toshi  Ocean Research Institute, University of Tokyo, Associate Professor, 海洋研究所, 助教授 (40183892)

Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 1995: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1994: ¥1,500,000 (Direct Cost: ¥1,500,000)
KeywordsOceanic Carbon Cycling / Microbes / Dissolved organic matter / Colloids / Protein / Degradation / Bacteria / Submicron Particles / 海洋物質循環 / 高分子溶存有機物 / 微生物分解 / 細胞外酵素
Research Abstract

This study tested the hypothesis that protein adsorbed to submicron particles in seawater is more slowly degraded than the same protein freely dissolved. Bacterial hydrolysis of methyl-^3H-bovine serum albumin (^3H-BSA) dissolved or adsorbed to particles (polystirene latex beads, diameters 0.126-1.5mum) was examined. Mixed bacterial assemblages cultured on BSA media, two bacterial isolates, and a natural marine bacterial assemblage hydrolyzed adsorbed ^3H-BSA at much slower rates (1/10-<1/200) than free 3H-BSA.The measured hydrolysis rates were compared with the predicted collision probabilities between bacteira and ^3H-BSA freely dissolved or adsorbed to beads of different diameters. These comparisons suggest that the hydrolysis rate is influenced primarily by the transport rate of ^3H-BSA to bacteria. Hydrolysis of adsorbed ^3H-BSA differed greatly between two bactirial strains, which appears to be explained by differences in the affinity of bacterial proteases to ^3H-BSA.The results of this study support the hypothesis that adsorption onto submicron particles greatly reduces degradation rate of proteins and suggest that the adsorption of dissolved organic matter (DOM) may be a mechanism that temporarily stores labile DOM in a slowly-degrading, "semi-labile" pool, which makes it available for export and further modification by geochemical processes.

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] Toshi Nagata: "Bacterial degradation of protein adsorbed to model submicron particles in seawater" Marine Ecology Progress Series. (in press).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Toshi Nagata: "Biogeochemical Processes and Ocean Flux in the Western Pacific(分担執筆)" Terra Scientific Publishing Company, 672 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 永田 俊: "大気水圏科学からみた地球温暖化(分担執筆)" 名古屋大学出版会(印刷中),

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Toshi Nagata: "Bacterial degradation of protein adsorbed to model submicron particles in seawater." Marine Ecology Progress Series. (in Press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Toshi Nagata, Marine colloids: "Their roles in food webs and biogeochemical fluxes, In : Biogeochemical Processes and Ocean Flux in the Western Pacific (eds.Sakai, H.and Nozaki, Y.)" Terra Sceintific Publishing Company. 275-292

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Toshi Nagata: "Ecological network of marine biota within the "Greenhouse", In : Global Warming (ed.Handa, N.)" Nagoya University Press. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Toshi Nagata: "Bacterial degradation of protein adsorbed to model submicron particles in seawater" Marine Ecology Progress Series. (印刷中).

    • Related Report
      1995 Annual Research Report
  • [Publications] Toshi Nagata: "Biogeochemical Processes and Ocean Flux in the Western Pacific(分担執筆)" Terra Scientific Publishing Company, 672 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 永田俊: "大気水圏科学からみた地球温暖化(分担執筆)" 名古屋大学出版会(印刷中),

    • Related Report
      1995 Annual Research Report
  • [Publications] 永田 俊: "海洋微生物の捕食過程における有機物代謝に関する研究" 海の研究. 3. 427-436 (1994)

    • Related Report
      1994 Annual Research Report

URL: 

Published: 1994-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi