NaCl (% w/v)   0.5   1.0   1.5   2.0   2.5   3.0   3.5
Initial surface tension (N/m) 0.057 0.059 0.057 0.059 0.057 0.057 0.056
Final surface tension (N/m) 0.054 0.055 0.053 0.053 0.056 0.058 0.057
Table 3: The result of surface tension measurement for culture grown on different salt concentration.