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Fig. 4 | Respiratory Research

Fig. 4

From: Electronic cigarette vapor alters the lateral structure but not tensiometric properties of calf lung surfactant

Fig. 4

Features of the Infasurf® surface structures at various surface pressure values before and after exposure to e-cigarette vapor (unflavored) and cigarette smoke as determined by atomic force microscopy: (a) average height and (b) average surface area covered by the structures. Cigarette smoke resulted in an increase in area fraction, which was significantly increased compared to control (shown by *), and in some cases to surfactant exposed to e-cigarettes vapor (shown by $). A p-value of 0.05 was used for all analysis

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