Figure 4.

Fluorescence images of A549 cells stained by the LipidTOX dye after a 48-h incubation. (A) Untreated control cell; (B) cell treated with 20 µg·mL⁻¹ γ-Fe₂O₃+SiO₂-COOH; (C) cell treated with 20 µg·mL⁻¹ γ-Fe₂O₃+SiO₂-NH₂; (D) cell treated with 20 µg·mL⁻¹ γ-Fe₂O₃+SiO₂. Green fluorescence represents phospholipid rich organelles. Blue fluorescence represents cell nuclei. Scale bar = 10 µm.