Resistant fungi isolated from contaminated uranium mine in Brazil shows a high capacity to uptake uranium from water
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2020
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Chemosphere
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The Osamu Utsumi uranium mine occupies a 20 km2 area in the city of Caldas, which is located in the
state of Minas Gerais, Brazil. Since mining activities ended at Osamu Utsumi 24 years ago, the surrounding
area has become contaminated by acid effluents containing high concentrations of uranium.
Thus, the aim of this study was to assess the uranium bioremediation capacity of 57 fungi isolated from
the mine area. In tolerance tests, 38% (22) of the fungal isolates were considered tolerant to uranium,
including 10 Penicillium species. At a uranium concentration of 2000 mg L 1 48 fungi did not exhibit
mycelial growth index inhibition. Minimal inhibitory concentration (MIC) analysis showed growth of 25
fungi above a uranium concentration of 8000 mg L 1. At high uranium concentrations, some fungi (i.e.,
Talaromyces amestolkiae and Penicillium citrinum) showed morphological changes and pigment (melanin)
production. Among the fungal isolates, those considered to be more tolerant to uranium were isolated
from soil and sediment samples containing higher concentrations of heavy metal. When comparing the
results of resistance/tolerance tests with those for uranium biosorption capacity, we concluded that the
fungi isolated from the Osamu Utsumi mine with the best potential for uranium bioremediation were
Gongronella butleri, Penicillium piscarium, Penicillium citrinum, Penicillium ludwigii, and Talaromyces
amestolkiae. Biosorption tests with live fungal biomass showed that 11 species had a high potential for
uranium uptake from contaminated water.
Como referenciar
COELHO, EDNEI; REIS, TATIANA A.; COTRIM, MARYCEL; MULLAN, THOMAS K.; CORREA, BENEDITO. Resistant fungi isolated from contaminated uranium mine in Brazil shows a high capacity to uptake uranium from water. Chemosphere, v. 248, p. 1-9, 2020. DOI: 10.1016/j.chemosphere.2020.126068. Disponível em: http://repositorio.ipen.br/handle/123456789/31358. Acesso em: 26 Apr 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.