Table 3.

Optical density at 600 nm of MgO and TiO₂ nanopowders after 24 h.

Tested Nanopowder Concentration (0.5 mg/mL)	OD of Sample with S. aureus	OD of Sample without S. aureus	Real OD Caused by Microbial Growth
MgO	0.043	0.038	0.005
TiO2	0.220	0.101	0.119
Biological control of S. aureus	-	-	0.243