| Budget Amount *help |
¥16,250,000 (Direct Cost: ¥12,500,000、Indirect Cost: ¥3,750,000)
Fiscal Year 2016: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2015: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2014: ¥6,760,000 (Direct Cost: ¥5,200,000、Indirect Cost: ¥1,560,000)
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| Outline of Final Research Achievements |
Because of the persistent characteristics of humic substances in the environment, they are not considered as active material in biological metabolic systems. However, humic substances are now understood as external electron mediators for microbes. This study aims to investigate the formation and degradation of humic substances as external electron mediators in natural environment. To examine the function of external electron mediator, we have used the humin-dependent anaerobic pentachlorophenol-dechlorinating culture. The results showed that the freeze-dried powder of some bacteria and fungi functioned as external electron mediators, and that some products of humic acids and metals showed the external electron mediators. These suggested the formation and degradation of external electron mediators in natural environment.
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