Uranium and thorium were found to be accumulated extracellularly on the surface of Aspergillus flavus. The rate and the extent of accumulation were subjected to variations in environmental parameters such as pH, temperature and the interference of certain anions and cations. The rates of uranium and thorium uptake by Aspergillus flavus were increased by chemical pretreatment of the cells. Accumulated uranium and thorium were removed chemically from Aspergillus flavus cells. The rate of uptake of uranium and thorium at 25°C±3°C was found to be extremely rapid at pH values of 4·5±0·2 and 2·5±0·2 respectively. Electron microscopic examinations showed that uranium and thorium were accumulated in a dense layer around the surface of Aspergillus flavus cells. © 1997 SCI.

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: Uranium and thorium were found to be accumulated extracellularly on the surface of Aspergillus Ñavus. The rate and the extent of accumulation were subjected to variations in environmental parameters such as pH, temperature and the interference of certain anions and cations. The rates of uranium and thorium uptake by Aspergillus Ñavus were increased by chemical pretreatment of the cells. Accumulated uranium and thorium were removed chemically from Aspergillus Ñavus cells. The rate of uptake of uranium and thorium at 25¡C^3¡C was found to be extremely rapid at pH values of 4É5^0É2 and 2É5^0É2 respectively. Electron microscopic examinations showed that uranium and thorium were accumulated in a dense layer around the surface of Aspergillus Ñavus cells.

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