Fig. 2From: Improving the thermostability and stress tolerance of an archaeon hyperthermophilic superoxide dismutase by fusion with a unique N-terminal domainEffects of temperature (a) and pH (b) on SOD activity. The optimal temperatures were determined by assaying the activity of purified SOD at temperatures ranging from 20 to 100 °C, and the optimal pH values were determined in buffers ranging from pH 3–10. The activity at the optimal temperature or pH was defined as 100 %. Each point represents the mean (n = 3) ± the standard deviationBack to article page