Table 1.

The mean±SD of the counted number of colonies in various groups in intervals of 0, 2, 4, 6 and 24 hours

Group	Time (hour)	Mean (CFU)	SD	No. of Samples
ZnO	0	140.84	65.79	19
	2	96.78	46.19	19
	4	96.10	75.64	19
	6	55.89	51.95	19
	24	219.32	304.53	19
CuO	0	145.20	65.77	20
	2	8.80	22.76	20
	4	0	0	20
	6	0	0	20
	24	0	0	20
ZnO-CuO	0	134.10	69.78	20
	2	0	0	20
	4	0	0	20
	6	0	0	20
	24	0	0	20
Control	0	165.91	53.19	12
	2	139.33	43.71	12
	4	135.08	68.93	12
	6	117.75	66.68	12
	24	921.25	823.68	12