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Fig. 8.
Antimicrobial activity of cell-free supernatant of E_ cloacae B14 against Gram-positive and Gram-negative pathogens using 30 µg/ml tetracycline as a control_ Standard deviations were calculated from the data obtained from triplicate experiments_
| Pathogenic bacteria | Inhibition zone diameter (mm) ± standard deviation | |
|---|---|---|
| Cell-free supernatant of B14 cultures | Tetracycline 30 μg/ml (control) | |
| Gram-negative bacteria | ||
| Escherichia coli | 12.3 ± 1.1 | 21.1 ± 0.5 |
| Pseudomonas aeruginosa | 17.0 ± 1.4 | 20.0 ± 0.7 |
| Serratia marcescens | 9.7 ± 1.5 | 0.0 ± 0.0 |
| Gram-positive bacteria | ||
| Bacillus cereus | 20.7 ± 2.0 | 30.0 ± 2.0 |
| Bacillus subtilis | 22.0 ± 1.8 | 20.0 ± 1.1 |
| Staphylococcus aureus | 26.7 ± 2.1 | 30.0 ± 1.8 |