Table 2.

AFM analysis of PEI–DNA complexes on SAMs

Surface	Complex N/P	Mean heighta (nm)	RMS roughnessb (nm)	Area–perimeter ratioc (nm)
0% EG	10	20	12	337 – 1270
40% EG	10	8	5	100
0% EG	25	8	2	72
40% EG	25	32	12	196 – 355

^aMean height of Fig. 8 histograms.

^bRMS roughness of Fig. 8 images.

^cArea–perimeter ratio of Fig. 8 images, ranges specify different regions of analysis.