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. 2018 Sep 28;19(10):2966. doi: 10.3390/ijms19102966

Figure 1.

Figure 1

NAI generation by UV lighting. The experiment was carried out in a growth chamber with dimensions of 80 cm length, 80 cm width and 80 cm height. A 30 watts of UV light (UV-C, 100–280 nm) was provided by Safer Electric Ltd., Singapore. NAI concentration was measured by the DLY-4G-232 air ion counter (Kilter Electronic Institute Co., Ltd., Zhangzhou, Fujian Province, China). (A) The average NAI concentrations of control (CK, no UV light) and UV lighting. The NAI concentration under UV light was significantly higher than the control as indicated by Mann–Whitney U test at p < 0.00001. (B–D) Graphs to show the curves of NAI concentrations among three different replicates. The star “*” indicated that the NAI concentration under UV lighting was statistically higher than that in CK by Mann–Whitney U test at p < 0.00001. NAI: negative air ions.