| Project/Area Number |
04660111
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
応用微生物学・発酵学
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| Research Institution | Gifu University |
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Principal Investigator |
KAWAI Keiichi Gifu University, Professor, 農学部, 教授 (00002064)
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| Co-Investigator(Kenkyū-buntansha) |
SUZUKI Tohru Gifu University, Associate Professor, 農学部, 助教授 (20235972)
TAKAMIZAWA Kazuhiro Gifu University, Professor, 農学部, 教授 (00159005)
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| Project Period (FY) |
1992 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1994: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1993: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1992: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Keywords | Rare Earths Accumulating Bacteria / Yttrium / Oligotrophic Bacteria / Rare Earths / Ytterbium / Yttrium Accumulating Bacteria / Ytterbium Accumulating Bacteria / 有用微量元素 / 貧栄養細菌 / オリゴトローフ / 希土類元素 / Comamonas acidovorans / Variovorax paradoxus / 希土類元素集積菌 / レアメタル / 低栄養微生物 / 希土元素集積菌 / 微量元素集積微生物 / 希土元素 |
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| Research Abstract |
We established the screening system for rare earth elements accumulating bacteria. Oligotrophic bacteria which are able to grow on al/100 diluted nutrient agar were isolated. Each isolant was cultured in yttrium (Y,5 ppm) containing diluted nutrient broth. We obtained 7 strains (A-G) which could decrease Y below 2.5ppm.
Strains B and D were identified as Comamonas acidovorans, and strain F was Variovorax paradoxus. The spectra of rare earth element accumulation were diferent each other among these isolants. There are two patterns on the mode of rare earth element accumulation. The one is the bacteria which accumulate from La to Nd, and the other is the bacteria which accumulate Tb, Dy, Ho and Er in addition of the above elements.
Next, we screened Yb accumulating bacteria, which was used as a representative of heavy rare earths. We obtained 5 strains, in which 3 strains were actinomycetes. Strain 3-1 accumulated Yb specifically.
These isolants are applicable to accumulation, separation and purification of rare earth elements.
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