Table 2.

Effect of cell phone EMF-r at 2100 MHz on the specific activities of (a) SOD and (b) CAT in onion roots.

Treatment/Exposure Period (h)	SOD activity (EU mg−1 protein)	CAT activity (EU mg−1 protein)
Control	3.51 ±0.09 a	1.28 ±0.04 a
Sham Control	3.90 ±0.02 ab	1.44 ±0.08 ab
1 h	4.12 ±0.06 b	1.73 ± 0.03 b
2 h	5.21 ± 0.13 c	2.13 ± 0.06 c
4 h	8.51 ± 0.41 d	3.17 ± 0.15 d

Different letters in a column represent significant difference at p ≤ 0.05 according to Tukey's Post hoc test.