The Effect of H2O2 on Tetrahymena Thermophila Population Growth Rates

Abstract

Tetrahymena thermophila is a unicellular eukaryote that is commonly present in freshwater environments and has a relatively quick growth rate making it an ideal organism to utilize in laboratory settings. This study investigates the impact of hydrogen peroxide (H₂O₂) concentrations on Tetrahymena thermophila growth considering the higher H₂O₂ levels in freshwater compared to marine environments. Samples with H₂O₂ concentrations of 0mM, 0.1mM, and 0.3mM were prepared, and Tetrahymena thermophila growth was monitored by cell counting using a hemocytometer every three hours. Linear regression, one-way ANOVA, and Tukey-Kramer analysis were employed for data analysis. The study revealed a concentration-dependent decrease in Tetrahymena thermophila growth with increasing H₂O₂ concentrations. Significant differences were observed between the control (0mM) and 0.1mM (p = 0.0334), as well as 0.3mM concentrations (p = 0.01). However, no significant difference was found between the 0.1mM and 0.3mM concentrations (p = 0.5611), suggesting a potential threshold effect. The findings align with existing literature, indicating a concentration-dependent response in Tetrahymena thermophila growth. Our findings confirm our hypothesis that increasing hydrogen peroxide concentrations leads to a decrease in Tetrahymena thermophila growth rates, further research may be conducted to explore the complex cellular mechanisms affected by exposure to H₂O₂.