Academic investigation of hot spring's microbial mats included high concentration of heavy metals (Au,Ag,Hg,Sr).

2002年和2003年，对俄罗斯堪察加半岛地热区和温泉中的生物进行了实地调查。我们观察到细菌在所有情况下都会沉淀大量的各种重金属。2004年，在台湾北东温泉和日本多摩川温泉进行了集中生物生物的实地研究。这两个温泉都以沉淀有放射性的重晶石而闻名。本研究观测到^<226>Ra （42.2 Bq/g）和^<228>Ra （1.35 Bq/g）的γ射线放射性，表明铀系以^<226>Ra为主。2005年，与坦桑尼亚达累斯萨拉姆大学muhongo教授小组进行了一项合作研究，目标是坦桑尼亚维多利亚湖南岸Geita附近的小规模金矿所造成的汞污染。在10个小型矿区附近采集了水、沉积物、土壤、生物生物和空中尘埃样品，并进行了矿物鉴定、化学成分分析等观察。光学显微镜和电子显微镜分析了汞在微生物细胞和黏土矿物颗粒周围的集中分布。这些在地热区、温泉和金属矿山中发现的生物生物的野外研究和实验室工作阐明了大气-水-土壤-微生物的相互作用和生物矿化作用。在纳米尺度上利用电子显微镜阐明了微生物在重金属矿物形成中的重要作用和机制。这些结果为重金属污染地区生物修复的应用提供了有价值的基础数据。

In 2002 and 2003,field researches were carried out to investigate biomats in geothermal area and in hot springs in Kamchatka, Russia. We have observed bacteria in all cases which precipitate a significant amount of various heavy metals. In 2004,filed studies were achieved focusing biomats in Hokuto Hot Springs, Taiwan, and Tamagawa Hot Springs, Japan. The both hot springs are famous of precipitation of hokutolite, radioactive barite. In this study we observed γ-ray radioactivity of ^<226>Ra (42.2 Bq/g) and ^<228>Ra (1.35 Bq/g), and this indicate that ^<226>Ra of uranium series is predominant. In 2005,a collaborative research with the group of Prof.Muhongo, Dar Es Salaam University, Tanzania, was carried out targeting a mercury-pollution caused by the small-scale gold mining around Geita, on the south coast of Lake Victoria, Tanzania. Samples of water, sediments, soil, biomats and aerial dusts were collected around ten small-scale mining sites, and many observations were made such as mineral identification, analyses of chemical compositions, etc. Optical microscopy and electron microscopy elucidated mercury distribution concentrated around the cell of microorganisms and clay mineral particles. All these field researches and laboratory works on biomats found in geothermal area, hot springs and metal mines elucidated atmosphere-water-soil-microorganisms interactions and biomineralization. An important role of microorganisms and mechanisms in formation of heavy metal minerals were clarified in nanometer-scale using electron microscopes. These results are fundamental data valuable for application of bioremediation in heavy metal-polluted area.