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了具有高度铀积累能力的微生物。通过视频测微计对这些微生物进行鉴定，确定它们为乳酸杆菌属、节杆菌属和芽孢杆菌属。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，人们发现，植物生物质，如固定化柿子单宁和树皮，可用于回收铀和金的水体系中。此外，人们认识到，通过使用电子自旋共振方法可以获得微生物的铜积累机制的信息。今后将对这些微生物和植物生物量富集重金属的机理进行进一步研究，并提出一些实用的方法。

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.