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Disc diffusion assay- inhibition zone formed against the growth of (a) E. coli and (b) S. aureus: 1- Z1, 2- ZA1, 3-Z2, 4-ZA2; (c) Bacterial viability by TTC assay for E. coli and S. aureus. The data represent the mean ± SD of three replicates. * denotes the statistical significant difference compared with controls (p < 0.001).
