Figure 2

Cell viability and proliferation measured with a MTT assay on surfaces with defined surface chemistries transfected with (a) Lipofectamine 2000 and (b) PEI. The resulting absorbance was read at λ = 570 nm and results are reported as mean +/− standard error of the mean. The slope of the lines connecting each set of consecutive timepoints is indicative of the rates of cell proliferation as evidenced by the rate equation ((Δ absorbance/surface area)/Δ time).