Fig. 2From: Endothelial responses of the alveolar barrier in vitro in a dose-controlled exposure to diesel exhaust particulate matterSize distribution of the DEPM aerosol that was produced with the PALAS powder aerosol generator and analyzed using particle counters (optical GRIMM Aerosol counter and SMPS + C counter by GRIMM Aerosol). Particle counts were registered for one minute with the rotating steel brush at 1200 rpm and the piston at 30 mm/h. Data represents the mean of three independent experiments ± SEM. a) measurement of the nano-range from 250 nm to 2 μm performed on an optical particle counter by GRIMM Aerosol b) measurement of the nano-range from 5 nm to 300 nm performed on a Sequential Mobility Particle Sizer and Counter (SMPS + C) by GRIMM AerosolBack to article page