Fig. 3
From: Application of impedance measurement to investigate in vitro inhalation toxicity of bacteria
Viability of the NuLi-1 cells in the presence of bacterial culture supernatants. The collected bacterial supernatants of E.faecalis (a), A.radioresistens (b), S.pneumoniae (c), A.viridans (d) and A.hydrophila (e) were applied at four different concentrations (percentage of the culture supernatant in 100 μl sample) and their effects were measured at 24 (black bars) and 48 h (grey bars). Cells treated with bacterial growth medium THY were used as controls reflecting 100% cell viability. The results are shown as a percentage of viable cells. The asterisk indicates statistically significant differences compared to the control (* = p < 0.05, ** = p < 0.01, *** = p < 0.001)