Fig. 7
From: Screening and identification of an Enterobacter ludwigii strain expressing an active β-xylosidase
Effects of different metal ions on enzyme activity. White: 2 mmol/L (His-Xyl62), light upward diagonal line: 10 mmol/L (His-Xyl62), dotted diamond:2 mmol/L (Xyl62-His), light downward diagonal line: 10 mmol/L (Xyl62-His). The figure demonstrated that six metal ions represented divergent effects to the enzymatic activity, and Ca2+ improves the enzymatic activity while Mg2+ inhibits the enzymatic activity