Figure 2
From: Bacterial bioburden and community structure of potable water used in the International Space Station
Bacterial count in the PWD water after 1:100 dilution by a biofluorescent particle counter with deep UV irradiation at 185 + 254 nm (a, d), at 254 nm (b, e) and without deep UV irradiation (c, f). Horizontal axis indicate the intracellular flavin-derived autofluorescence intensity of the measured particles (a–c). The histograms (d–f) show the number of particles with autofluorescence intensity exceeding 133 mV on the vertical axis. The total numbers of particles counted as autofluorescent particles were the cumulative total of the number of particles on the vertical axis from 133 to 1200 mV on the horizontal axis, 1.1 × 105 particles/mL (d), 1.1 × 105 particles/mL (e), and 1.7 × 103 cell/mL (f).
