@misc{oai:repo.qst.go.jp:00067761,
 author = {Ishii, Nobuyoshi and Tagami, Keiko and 石井 伸昌 and 田上 恵子},
 month = {Oct},
 note = {Bioaccumulation of technetium (Tc) by bacterial community in water body covering a rice paddy field soil is studied to gain insight on the behavior of Tc in agricultural ecosystem. The radioactive tracer, pertechnetate (95mTcO4-), was added to aqueous solution collected from a waterlogged paddy field soil. The solution was incubated statically at 25 under dark conditions. Up to 80% of the total 95mTc was removed from the solution for 4 days. However, little 95mTc was removed;
from both a cell-free filtrate solution and a filtrate mixed with autoclaved cell particles at day 4. The maximum removal of the 95mTc, about 85%, was achieved
by addition of nutrients to the solution. When activities of bacteria inhibited
by addition of antibiotics, only 23% of the 95mTc was removed. Addition of cycloheximide, however, did not affect on the removal of the 95mTc. These results indicate that the bacterial community living in water body accumulates Tc. In order to determine the effects of oxygen level on Tc removal, bacterial communities were incubated under aerobic and anaerobic conditions. It is reasonable that the
bacterial community cultured under anaerobic conditions removed 80% of Tc from the solution, however, interestingly, the bacterial community grown under aerobic conditions also showed Tc removal of 30%. The result implies that aerobic bacterial communities have a potential for removing Tc from aqueous solutions., International Conference on Protection of the Environment from the Effects of Ionizing Radiation},
 title = {Bioaccumulation of technetium by bacterial community in water covering a rice paddy field soil},
 year = {2003}
}