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Table 2 β-galactosidase activity results of ARSA after treatment with ampicillin, SSE alone or in combination

From: Synergistic activity and mechanism of action of Stephania suberosa Forman extract and ampicillin combination against ampicillin-resistant Staphylococcus aureus

Time Control (no drug) Amp (256) SSE (2) Amp + SSE (0.11 + 1.5) NIS (8) (positive control)
0 Neg Neg Neg Neg Neg
1 Neg Neg Neg Pos Pos
2 Neg Neg Neg Pos Pos
3 Neg Neg Neg Pos Pos
4 Neg Neg Neg Pos Pos
5 Neg Neg Neg Pos Pos
  1. Neg, no evidence of activity; Pos, have evidence of activity; Amp (256), ampicillin at 256 μg/ml; SSE (2), Stephania suberosa extract at 2 mg/ml; Amp + SSE (0.11 + 1.5) = Ampicillin 0.11 μg/ml plus SSE 1.5 mg/ml; NIS (8), Nisin at 8 μg/ml was used as a positive control. The experiment was carried out in triplicate observations.