Figure 3.

Cell adhesion of human keratinocyte HaCaT cells on glass coverslips (control) (a,b) and on calcium alginate films without carbon nanomaterials (negative control) (c,d) by optical microscopy in transmission light mode and fluorescence microscopy (DAPI and Phalloidin-FITC staining). The magnification of the utilized objective lens is indicated for each image. Cell adhesion on the glass coverslips is observed by either optical or fluorescence microscopy. Nevertheless, no cell adhesion is observed by neither optical nor fluorescence microscopy on calcium alginate.