1. The Effect of Three Surface Disinfectants on Four Types of Bacteria Done By: Fatimah Al Bazron Undergraduate Student (Microbiology Concentration) Department of Biology, Tennessee Tech University Cookeville, Tennessee 38505 falbazron42@students.tntech.edu

2. Introduction The end zone: measuring antimicrobial effectiveness with zones of inhibition (Olson 2007). Effect of antecedent growth conditions on sensitivity of Escherichia coli to chlorine dioxide (Berg et al 1982). Effectiveness of disinfectants in killing Enterobacter sakazakii in suspension, dried on the surface of stainless steel, and in a biofilm (Kim and Beuchat 2006). Antibacterial activity of hydroalcoholic extract of Terminalia chebula Retz. on different gram-positive and gram-negative bacteria (Agrawal et al 2010).

3. Objective/Hypothesis Objectives: To determine the efficiency of some disinfectants on bacterial growth. Hypothesis: The resistance of bacterial growth will vary depending on bacterial type and disinfectant used. Null-Hypothesis: There will be no difference on bacterial growth.

4. Methods and Materials Materials:

5. Methods and Materials Cont. Procedure:

6. Methods and Materials Cont.

7. Methods and Materials Cont.

8. Results

9. Results Cont. NMean Std. Deviation Std. Error Vesphene249.04177.281.486 Bleach2424.833310.00722.0427 95% Ethanol249.04175.69121.1617 Water24000

10. Results Cont.

11. Discussion Hypothesis accepted and Null-Hypothesis rejected Bleach showed the best results as in previous experiment

12. Conclusion What makes a good disinfectant?!!

13. Thank You Very Much