| Project/Area Number |
05554012
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Geology
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| Research Institution | Kanazawa University |
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Principal Investigator |
TAZAKI Kazue KANAZAWA Univ. Graduate School, Prof., 自然科学研究科, 教授 (80211358)
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| Co-Investigator(Kenkyū-buntansha) |
IIZUMI Shigeru Shimane Univ., Faculty Sci., Prof., 理工学部, 教授 (80032639)
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| Project Period (FY) |
1993 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥14,300,000 (Direct Cost: ¥14,300,000)
Fiscal Year 1995: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1994: ¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1993: ¥11,200,000 (Direct Cost: ¥11,200,000)
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| Keywords | LV-Wet SEM-EDX / Microbial Mats / Bacteria / Biominerals / T.E.M. / Fe, Mn, Zn, U,As / Mining / Sediments / バイマット / 活性汚泥 / 微生物腐食 / ジャロサイト / アンモニオジャロサイト / トルコ石 / 低真空走査型電顕 |
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| Research Abstract |
Abstract : Metal sorption and biomineralization largely reflect the availability of dissolved metals in hydrosphere systems. The metal-loaded bacteria has profound implications for the transfer of metals from the hydrosphere to the sediments. Microorganisms will have playd an important role in metal deposition under various temperature conditions. The microorganisms concentrate aqueous dissolved metals onto cell walls and at intracellular sites, during the life cycle, and strongly bind metals during early diagenesis. A sequence is observed in which amorphous cations concentrated at cell walls are progressively transformed to microcrystalline aggregates of carbonate, silicate, Mn-Fe oxides, and clay minerals. The bioprecipitated oxides and oxyhydroxides act as scavengers for heavy metals such as Cu, Pb, Zn, Cd, Sr, and U,in the aqueous toxic-metal dispersion environment. The biomineralization of bacterial cells has been followed in a laboratory simulation by electron microscopy and energy-dispersive X-ray spectroscopy. Several kinds of bacteria were examined for the ability to remove heavy metals from solution. SEM-EDX,TEM,XRF and XRD results indicated that most of metals accumulated at the cell surface as crystalline precipitates after several days of aging.
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