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Evaluation of the sensitivity to zinc of ciliates Euplotes vannus and Euplotes crassus and their naturally associated bacteria isolated from a polluted tropical bay
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Evaluation of the sensitivity to zinc of ciliates Euplotes vannus and Euplotes crassus and their naturally associated bacteria isolated from a polluted tropical bay
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Evaluation of the sensitivity to zinc of ciliates Euplotes vannus and Euplotes crassus and their naturally associated bacteria isolated from a polluted tropical bay
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Journal Article
Evaluation of the sensitivity to zinc of ciliates Euplotes vannus and Euplotes crassus and their naturally associated bacteria isolated from a polluted tropical bay
2015
Overview
The aim of this study was to evaluate the Zn sensitivity of Euplotes vannus, Euplotes crassus, and their naturally associated bacteria sampled from sediments in the northwest and east regions of Guanabara Bay. The unexposed ciliates and bacteria did not appear to be negatively affected by 96 h of assay. In the control group, E. vannus exhibited an increase in the biomass content from 2.3 × 10²to 2.3 × 10³ μg C cm⁻³between 0 and 96 h, and E. crassus increased up to 7.07 × 10² μg C cm⁻³at 48 h. The maximum biomass was pointed by E. crassus (1.33 × 10³ μg C cm⁻³) in the presence of 0.005 mg Zn L⁻¹and E. vannus was naturally associated bacteria (2.40 × 10⁻¹ μg C cm⁻³) in the presence of 1.0 mg Zn L⁻¹(96 h). The growth of E. vannus from the northwest region showed concentration-dependent manners, and it is more sensitive to zinc than E. crassus from the southeast. Naturally associated bacteria showed better adaptation to increasing concentrations of Zn, and the Dunnett test showed that previous environmental selection is important. These results show that new bioremediation tools are necessary.
Publisher
Springer-Verlag,Springer Berlin Heidelberg,Springer Nature B.V
