Study on the heavy metal accumulation by biomass, and the developmernt of new adsorbents for heavy metals utilizing bio-accumulation mechanism.

从位于日本、美利坚合众国、加拿大和澳大利亚的铀矿床中分离出具有高富集能力的微生物。根据这些微生物的特征，用视频千分尺鉴定为乳杆菌、节杆菌和芽孢杆菌。这些细菌也有能力积累钍和钚（核反应堆的重要放射性废物）。另一方面，发现固定化柿子单宁和树皮等植物生物量可用于水体系中铀和金的回收。此外，还认识到利用电子自旋共振方法可以获得微生物铜积累机制的信息。今后，将进一步研究这些微生物和蔬菜生物量对重金属积累的机理和一些切实可行的方法。

Microorganisms having high abilities to accumulate uranium were separated from uranium deposits located in Japan, United States of America, Canada and Australia. These microorganisms were identified as Lactobacillus, Arthrobacter and Bacillus from their characteristics using a video micrometer. These bacteria have also abilities to accumulate thorium and plutonium (important radioactive waste from nuclear reactor). On the other hand, it was found that vegetable biomass, such as immobilized persimmon tannin and barks, could be used for the recovery of uranium and gold in aqueous systems. Furthermore, it was recognized that information on copper accumulation mechanisms of microorganisms could be obtained by using the electron spin resonance method. In future, further study on the mechanisms of heavy metal accumulation by these microbial and vegetable biomass and some practical approach will be conducted.