Table 3. Concentrations of catalase and superoxide dismutase increase in response to DC.

Organism	Catalase(nmol/min/ml)				Superoxide dismutase(units/ml)
	0 μA	Std. Dev.	200 μA	Std. Dev.	0 μA	Std. Dev.	200 μA	Std. Dev.	P value
S. aureus	0	0	20.04	3.06	0	0	1.02	0.27	0.004
S. epidermidis	0.96	0.43	26.27	1.13	0	0	1.52	0.26	0.0021
P. aeruginosa	0.17	0.25	16.59	2.79	0	0	0.76	0.11	0.0019

Mean concentration of catalase and superoxide dismutase produced after 24 hours of exposure to200 μA direct current. For catalase assay; n = 2, for SOD assay; n = 6 for S. epidermidis and P. aeruginosa, n = 5 for S. aureus. Samples not exposed to DC are shown as 0 μA. Std. Dev., standard deviation.