| Project/Area Number |
07651144
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
資源開発工学
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| Research Institution | TOHOKU UNIVERSITY |
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Principal Investigator |
CHIDA Tadashi Tohoku Univ., Fac. of Eng., Professor, 工学部, 教授 (10005499)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1996: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1995: ¥1,700,000 (Direct Cost: ¥1,700,000)
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| Keywords | Iron-oxidizing Bacteria / Oxidation / Productive Inhibition / Ferreous Sulfate / Mathematical Model |
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| Research Abstract |
This study is investigated to reduce the inhibition of Fe^<3+> produced by the bacteria. The results are as follows ;
1. the oxidation rate by the iron-oxidizing bacteria in enrichment culture under the no growth condition reduces with increasing Fe^<3+> concentration, and competitive inhibition reported until now cann't explain this inhibition ; 2. as a result of the experiment used strain T23-3 of Thiobacillus ferrooxidans isolated from enrichment culture, the effect and mechanism of productive inhibition are the same in pure culture as in enrichment culture ; 3. as a result of the experiment used strain ATCC23270 and strain E-15 isolated from Kosaka smelter, the effect and mechanism of productive inhibition are the same as in enrichment culture ; 4. in new inhibition model, Fe^<3+> competes against iron oxidation enzyme 2 to 1, and this model can explain the results of ATCC23270, E-15, T23-3 and the iron-oxidizing bacteria in enrichment culture ; 5. the mechanism of Fe^<3+> inhibition is the same but the degree of the effect is different every strains. So it is possible to reduce productive inhibition, if you select a strain according to Fe^<3+> concentration where the iron-oxidizing bacteria used. And in case of selection the model can be useful ; 6. at every strains the mechanism of productive inhibition of iron-oxidizing bacteria is the same under the no growth condition.
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