Heavy Metals Affect the Antioxidant Defences in the Soil Ciliate <i>Rigidohymena tetracirrata</i>.

ABSTRACT: In this study, we evaluated the cytotoxicity and antioxidant activity of the soil ciliate Rigidohymena tetracirrata (Gellért, 1942) Berger 2011, exposed to single and bimetallic mixtures of heavy metals (HMs) for 24 h. Ecotoxicological tests showed LC₂₀ values of 0.16, 19.86 and 0.68 mg L^-1 to Copper (Cu), Zinc (Zn), and Cadmium (Cd), respectively, and LC₅₀ values of 0.25, 44.12 and 1.12 mg L^-1, respectively. Furthermore, it was observed that the mixture of Cd and Zn exhibited antagonism in comparison to other mixtures, (Cd + Cu and Cu + Zn). In the total phenolic content (TPC) assay, a higher phenolic content was observed for the LC₂₀ of extracellular Cu (p ≤ 0.01) and the LC₂₀ of intracellular Cd (p ≤

SUBMITTER: Varatharajan GR 

PROVIDER: S-EPMC12565027 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature