Figure 4

Retention of P. aeruginosa LPS assessed by determining LPS concentrations (EU/ml) with the LAL test.
New ultrafilter (NUF); Reference ultrafilter (RUF); Challenge solutions (black bars); Filtrates (white bar); LOD = 0.005 EU/ml; **P < 0.001; *P < 0.01 versus buffer and °°P < 0.001; °P < 0.01 versus corresponding challenge solution; n = 3.