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

从日本、美国、加拿大和澳大利亚的铀矿床中分离出具有高积累铀能力的微生物。这些微生物通过视频测微仪鉴定为乳杆菌、节杆菌和芽孢杆菌。这些细菌还具有积累钍和钚(核反应堆产生的重要放射性废物)的能力。另一方面，研究发现，植物生物量，如固定化的柿单宁和树皮，可以用于水体系中铀和金的回收。此外，人们认识到，可以通过电子自旋共振方法获得关于微生物铜积累机制的信息。今后将对这些微生物和蔬菜生物量积累重金属的机理进行进一步的研究，并提出一些实用的途径。

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.