| 摘要 |
PROBLEM TO BE SOLVED: To obtain a new microorganism belonging to the genus Streptomyces and capable of accumulating rare earth element in high efficiency. SOLUTION: This microorganism is capable of accumulating rare earth elements and belongs to the genus Streptomyces, e.g. Streptomyces exfoliatus 27-1 strain (FERM P-15212). The microorganism can be produced by adding agar to a diluted broth medium having a nutrient content of 1/100, sterilizing under high pressure, culturing a soil-based specimen collected from a moss grown in the farm of the Gifu University in the obtained agar medium for primary screening to obtain oligotrophic bacteria, culturing the bacteria in a liquid medium for secondary screening having an ytterbium(Yb) concentration of 5ppm and selecting a strain capable of decreasing the Yb concentration in the culture liquid. The cultivation of the microorganism is preferably carried out at 25-40 deg.C and pH 6-8. It is preferable to add a rare earth element such as Yb and scandium to the medium for accumulating rare earth elements in the microorganism in high efficiency. |
