Diversity, metal resistance and uranium sequestration abilities of bacteria from uranium ore deposit in deep earth stratum

Ecotoxicology and Environmental Safety
Ekramul Islam, Pinaki Sar

Abstract

Metal resistance and uranium (U) sequestration abilities of bacteria residing in subsurface U ore was investigated using 122 pure culture strains isolated through enrichment. The cumulative frequencies of isolates resistant to each metal tested were as follows: As(V), 74%; Zn, 58%; Ni, 53%; Cd, 47%; Cr(VI), 41%; Co, 40%; Cu, 20%; and Hg, 4%. 16S rRNA gene analysis revealed that isolated bacteria belonged to 14 genera with abundance of Arthrobacter, Microbacterium, Acinetobacter and Stenotrophomonas. Cobalt did not interfere with the growth of most of the bacterial isolates belonging to different groups while U allowed growth of four different genera of which Stenotrophomonas and Microbacterium showed high U tolerance. Interestingly, tolerance to Ni, Zn, Cu, and Hg was observed only in Microbacterium, Arthrobacter, Paenibacillus¸ and Acinetobacter, respectively. However, Microbacterium was found to be dominant when isolated from other five different metal enrichments including U. Uranium removal study showed that 84% of the test bacteria could remove more than 50mgUg(-1) dry weight from 80 or 160mgL(-1) U within 48h. In general, Microbacterium, Arthrobacter and Acinetobacter could remove a higher amount of U. High resolution tra...Continue Reading

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Citations

Mar 20, 2019·Environmental Science and Pollution Research International·Kiron BhakatEkramul Islam
Jan 7, 2019·Environmental Science and Pollution Research International·Taotao ZengShuibo Xie
Jan 17, 2021·Journal of Hazardous Materials·Uday Kumar BanalaSubba Rao Toleti
Feb 23, 2021·Microbial Biotechnology·Margarita Lopez-FernandezMohamed L Merroun
Jul 30, 2021·The Science of the Total Environment·Wenbo YouMaosheng Zheng

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