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41.
Galun M Siegel SM Cannon MI Siegel BZ Galun E 《Environmental pollution (Barking, Essex : 1987)》1987,43(3):209-218
When Penicillium digitatum Saccardo cultures are exposed to aqueous solutions containing soluble uranium salts, considerable amounts of this element are accumulated in the fungal mycelium. The accumulated uranium is retained after thorough rinsing with distilled water but is removed by alkali carbonate solutions. Analysis of thick sections (0.5 microm) of the fungal hyphae with TEM, after incubation in UO(2)Cl(2) solutions of varying concentrations under both light and dark conditions, revealed conspicuous crystal-like deposits in UO(2)Cl(2)-exposed hyphae, but none in the control hyphae. Thick sections were necessary for crystal visualization. Using energy-dispersive X-ray analysis, uranium was detected as the only heavy element in these crystals. Uranium crystal biosorption was localized on the outside surface of the hyphal cell wall (following short exposures to relatively low uranium concentrations) or inside the cell wall (following long exposure to relatively high uranium concentrations). In some cases, crystal-like deposits of uranium salts were located on the outside surface as well as inside the cell. 相似文献