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自然产出的纳米二氧化硅、结晶型二氧化硅和工业生产的纳米二氧化硅（50 nm）刺激24 h-72 h后，BEAS-2B细胞DCF荧光强度的变化。数值采用Mean±SD表示，*代表DCF荧光强度增加组间比较有差异（P < 0.05），**代表DCF荧光强度增加组间比较有明显差异（P < 0.01）
The DCF-fluorescence increase of BEAS-2B cells after 24 h-72 h exposed to naturally occurring silica nanoparticles (Xuan Wei group), 50 nm silica nanoparticles (industrially produced) and crystalline silica. Values are Mean±SD from three independent experiments, *indicated the DCF-fluorescence increase differently (P < 0.05), ** (P < 0.01)
