Figure 4
From: Antitumor activity of colloidal silver on MCF-7 human breast cancer cells
Effect of colloidal silver on LDH activity in MCF-7 cells and PBMC. LDH activity was measured by changes in optical densities due to NAD+reduction which were monitored at 490 nm, as described in the text, using the Cytotoxicity Detection Lactate Dehydrogenase kit. The experiments were performed in triplicates; data shown represent mean + SD of three independent experiments. *P < 0.05 as compared with untreated cells.