Fig. 6.

Effect of salt, pH, and temperature on protease activity of halophilic strains AT2RP4, HL1RS13, NRS4HaP9, and LK3HaP7. Specific protease activity (U/mg) was plotted against different concentrations of NaCl (0–2.5 M) (a), pH 6–11 (b), and temperature 4–45 °C (c). For each strains, the data represent an average of three independent experiments with standard error