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Cultivation of diatoms using Tb-doped silicate minerals to characterize silicon utilized by diatoms

Research Project

Project/Area Number 12640477
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 地球化学
Research InstitutionTokyo University of Agriculture and Technology

Principal Investigator

AKAGI Tasuku  Tokyo University of Agriculture and Technology, Faculty of Agriculture, Professor, 農学部, 教授 (80184076)

Co-Investigator(Kenkyū-buntansha) OGAWA Hiroshi  Tokyo University, Marine research institute, associate professor, 海洋研究所, 助教授 (50260518)
Project Period (FY) 2000 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥2,700,000 (Direct Cost: ¥2,700,000)
Fiscal Year 2001: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2000: ¥1,500,000 (Direct Cost: ¥1,500,000)
Keywordsdiatoms / speciation of sillcon / Skeletonema / cultivation experiment / carbon geocycle / terbium / ケイ素 / 海洋化学 / テルビラム
Research Abstract

Diatoms are responsible for as much as 70% of the primary product in the ocean and play a major role of biological pump. This is because they sequester the atmospheric carbon dioxide effectively by transporting assimilated carbon into deeper layer of the ocean in capsules of relatively stable silica. However, the clear explanation for the timing of diatom bloom has not been given. We have conducted cultivation experiments of diatoms to investigate the chemical form of silicon incorporated by diatoms. So far, we have made the following achievements itemized below.
1) Cultivation and analysis
Proliferation was observed when quartz particles were exclusive source of silicon and Similar proliferation was observed in the terbium doped system. The silicon particles, diatoms and seawater were successfully separated with two filters and the determination of silicon in quartz particles and diatoms was also successful with boiling the separated samples in a sodium hydroxide solution.
2) Cultivation apparatus
A wave-generator was designed and set in a controlled cultivation box to mimic the natural environment of diatom growth.
3) The suppression of blank value of silicon in the analysis
Reference cultivations should be conducted at the comparatively small level of silicon concentration, which was made possible by selecting and washing proper equipments and plastic-ware.
4) Time and condition of the diatom cultivation
Proliferation of diatoms was suppressed with rocking and the proliferation of diatoms were observed between two weeks and one month times.
5) Incorporation of terbium in diatoms
Detectable amount of terbium was incorporated in diatoms, suggesting that the diatoms utilized silicon in quartz particles. However, it was found that some replicate expriments are required to confirm the results.

Report

(3 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • Research Products

    (18 results)

All Other

All Publications (18 results)

  • [Publications] F.-F.Fu, T.Akagi, S.Yabuki, M.Iwaki: "The variation of REE (rare earth elements) patterns in soil-grown plants : a new proxy for the source of rare earth elements and silicon in plants"Plant and Soil. 235. 53-64 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Akagi, F.-F.Fu, S.Yabuki: "Absence of Ce anomaly in the REE patterns of peat moss and peat grass in the Ozegahara peatland"Geochem.J.. 36. 113-118 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] F.-F.Fu, T.Akagi, S.Yabuki: "Origin of silica particles found in the cortex of Matteuccia roots"Soil Science Society America J.. 66. 1265-1271 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] K.IGARASHI, T.AKAGI, FU F.-F., S.YABUKI: "Determination of Rare Earth Elements in a Limestone Geological Standard using Solvent Extraction with ICP-MS Detection"Anal.Sci.. 2003. 441-445 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] F. -F. Fu, T. Akagi, S. Yabuki and M. Iwaki: "The variation of REE (rare earth elements) patterns in soil-grown plants : a new proxy for the source of rare earth elements and silicon in plants."Plant and Soil. 235. 53-64 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Akagi, F. -F. Fu and S. Yabuki: "Absence of Ce anomaly in the REE patterns of peat moss and peat grass in the Ozegahara peatland."Geochem. J.. 36. 113-118 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] F. -F. Fu, T. Akagi and S. Yabuki: "Origin of silica particles found in the cortex of Matteuccia roots."Soil Science Society America J.. 66. 1265-1271 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] K. IGARASHI, T. AKAGI, FU F. -F. and S. YABUKI: "Determination of Rare Earth Elements in a Limestone Geological Standard using Solvent Extraction with ICP-MS Detection"Anal. Sci.. 2003. 441-445 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H.Tsuno, H.Kagi, T.Akagi: "Effects of trace lanthanumion on the stability of vaterite and transformation from vaterite to calcite in an aquatic system"Bulletin Chem Soc.Japan. 74. 479-486 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] F.-F.Fu, T.Akagi, S.Yabuki, M.Iwaki: "The variation of REE patterns in soil-grown plants : a new proxy for the source of rare earth elements and silicon in plants"Plant and Soil. 235. 53-64 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.Akagi, F.-F.Fu, S.Yabuki: "Absence of Ce anomaly in the REE patterns of peat moss and peat grass in the Ozegahara peatland"Geochem.J.. (in press).

    • Related Report
      2001 Annual Research Report
  • [Publications] F.-F.Fu, T.Akagi, S.Yabuki: "Origin of silica particles found in the cortex of Matteuccia roots"Soil Science Society America J.. (in press).

    • Related Report
      2001 Annual Research Report
  • [Publications] 日高 洋, 赤木 右: "同位体比の定義と標準"ぶんせき. 2002(1). 2-8 (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] H.Ogawa, Y.Amagai, I.Koike, K.Kaiser, R.Benner: "Production of refractory dissolved organic matter by bacteria"Science. 292. 917-920 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Fu,Akagi,Yabaki,Iwaki & Ogura: "Distribution of rare earth elements in seaweed : implication for two different sources of rare earth elements and silicon in sea weed."Journal of Phycology. 36. 62-70 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 赤木右,付鳳富: "希土類元素プローブの生物圏への展開"ぶんせき. 8. 453-458 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 赤木右,津野宏: "炭素循環の鍵を握る!?バラ型バテライト結晶"ぶんせき. 1. 48-48 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] Tsuno,Kagi & Akagi: "Effects of trace lanthnum ion on the stability of vaterite and transformation from vaterite to calcite in an aquatic system."Bulletin of chemical. Society of Japan. (印刷中). (2001)

    • Related Report
      2000 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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