Fundamental research on biotransformation of actinides during intake of bacteria by Protozoa

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It was found that the representative of protozoa, Paramecium sp., may have a function to prevent adsorption of heavy elements on the cell membranes. When cells of Paramecium sp. were cultured with yeast cells as food source, the heavy elements pre-fixed on the yeast cells were hardly leached in the culture medium and excreted from paramecium cells as phosphates with indigestible residue of the yeast cells. This finding implies that functions of microorganism such as yeast and bacteria to immobilize heavy elements on the cells can be expected in the actual ecological system.