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. 2017 Feb 25;9(3):82. doi: 10.3390/polym9030082

Figure 12.

Figure 12

SEM images of cells on PET surfaces treated in various SO2 + O2 mixtures after 24 h of incubation: (a) 100% SO2; (b) 90% SO2 + 10% O2; (c) 60% SO2 + 40% O2; and (d) 10% SO2 + 90% O2.