1. Swab the surface of each plate with microorganism strains; to ensure complete covering.
2. Remove the lid of an inoculated plate and cover one half of the plate with an aluminum foil. Keep one each as controls.
3. Place each plate directly under the UV lamp about 30 cm from the UV light for 15 and 60 min. Incubate all plates at 37oC for 24-48 hrs.
4. Examine all plates and record your results by comparing the cell growth of bacteria and fungi either cover or uncover with foil. Place two sterile Petri plates, lid side up, in front of you. CAUTION: Do not open the lids until you have read the entire procedure