Fig. 3
Impacts of physico-chemical stress exposure on eDNA release by S. epidermidis biofilm and planktonic cells. The percentage change in eDNA yield by pairs of S. epidermidis biofilm and planktonic cultures exposed to sub-lethal heat (50 °C) (a), 0.8 M NaCl (b), 5 mM NaOCl (c) and 50 μM H2O2 (d) for 60 min. The horizontal line across the box is the median percentage change in eDNA yield, the lower and upper ends of the box are the 25th and 75th percentiles. The whiskers represent the minimum and maximum percentage changes in eDNA yield. Values for ATCC 29213 are for three independent experiments. Statistical significance between S. epidermidis biofilm and planktonic cultures were determined by Wilcoxon matched-pairs signed rank test (NS, p > 0.05; *, p < 0.05; **, p < 0.01)