Figure 4
From: Antitumor activity of colloidal silver on MCF-7 human breast cancer cells
![Figure 4](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2F1756-9966-29-148/MediaObjects/13046_2010_Article_395_Fig4_HTML.jpg)
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.