Table 2.

The zone of inhibition diameters (cm) of the studied soil bacteria by the surfactant produced by the SH21 isolate.

Concentrations	SH11	SH12	SH13	SH14
1/2 × CMC	0.56 ± 0.06	0.24 ± 0.02	0.64 ± 0.02	0.25 ± 0.03
CMC	0.73 ± 0.03	0.35 ± 0.01	0.77 ± 0.03	0.27 ± 0.05
2 × CMC	1.35 ± 0.05	0.66 ± 0.02	1.58 ± 0.03	0.84 ± 0.03
4 × CMC	1.8 ± 0.06	142 ± 0.02	1.91 ± 0.06	1.6 ± 0.08