AI Article Synopsis
- The study investigates the uranium absorption abilities of Bacillus pantothenticus and Bacillus megaterium, which were sourced from the environment near a gamma radiation source, comparing them with Pseudomonas putida and Pseudomonas chlororaphis as reference species.
- It concludes that the local species have a superior ability to uptake uranium, with Bacillus megaterium and Pseudomonas chlororaphis reaching maximum uptake at 20 microg U mL(-1) and Bacillus pantothenticus at 30 microg U mL(-1).
- Additionally, environmental factors like pH and temperature significantly influence uranium absorption, with B. pantothenticus showing consistent uptake regardless of metabolic activity in dead
Article Abstract
In the present study, uranium absorption capacity of Bacillus pantothenticus and Bacillus megaterium, previously isolated from the environmental air surrounding the 60Co gamma source, is reported. Pseudomonas putida and Pseudomonas chlororaphis were used as reference species. Concerning uranium uptake, the local species were more efficient than the reference ones. The maximum uptake of uranium was achieved by B. megaterium and P. chlororaphis at 20 microg U mL(-1) and by B. pantothenticus at 30 microg U mL(-1). The transmission electron microscope examination indicated that uranium was absorbed onto the cell surface of the studied isolates. Furthermore, the increase in biomass concentration has shown an increase in the total amount of uranium removed. Dead cells exhibited uranium uptake to the same or greater extent than living cells. B. pantothenticus, P. putida, and P. chlororaphis achieved maximum uptake at pH 4.0, whereas for B. megaterium it was at pH 6.0. Temperature had an important role in uranium absorption of all the studied species except B. pantothenticus. Metabolic inhibitors did not affect the uptake.
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