Figure 7

TEM results of Chlorella vulgaris exposed to different nanoparticles at 100 μg ml ⁻¹ for 48 hours. C. vulgaris cell cultured with Bold’s basal (BB) culture medium only (A), C. vulgaris cell cultured with Multi-walled carbon nanotubes (MWCNTs) in BB culture medium (B), C. vulgaris cell cultured with cotton cellulose nanofibers (CNFs) in BB culture medium (C); C. vulgaris cell cultured with Seine river water only (D), C. vulgaris cell cultured with MWCNT in Seine river water (E), C. vulgaris cell cultured with cotton CNFs in Seine river water (F). MWCNTs (small black tubes) are inside the cell (B) while there is no evidence of cotton CNFs was found inside the cells. Black arrows: extracellular MWCNTs or cotton CNF; white arrows: intracellular MWCNTs.