Science Fair Projects

Bacteria Affected by Ultra-Violet Light

Abstract

The objective: My objective was to see what the affect was of ultra-violet light on bacteria. I hoped that the bacteria would get killed, and wanted to see a decrease in bacteria colonies.

Methods/Materials

I first collected water samples at Arroyo Burro Creek. I immediately took the first sample with the water untouched by the UV light. I exposed the water sources to the light for 24 hours, taking samples of bacteria at 1 hour, 6 hours, 12 hours, and 24 hours. When completed, I took the samples to the microbiology lab of Cottage Hospital. My bacteria samples were incubated for 24 hours. I was then able to count colonies and record my data.

Results

The results I recieved weren't exactly what I wanted. After the first trials, there was a slight decrease in colonies, and then the numbers went back to even higher than the original sample. I repeated the experiment with a higher intensity lamp, and realized that now the colonies continued to decrease throughout the entire experiment.

Conclusions/Discussion

After being unsatisfied with my results, I decided to look on the Internet to find any information about the methods the city was proposing to use. I found exactly what I was looking for. I knew that I needed to have a higher intensity lamp, and my light was only 15 watts. I knew that Energy = Watts / Distance squared, (E=W/D^2), so I decreased the distance between the UV lamp and the water source. I learned that even the slightest difference in methods could prove devestating.

This project is about the affect of ultra-violet light on bacteria of Arroyo Burro Creek.

Science Fair Project done By Lesley M. Anderson

 

Related Projects : Which Ground Beef Has the Least Bacteria, Do Different Dilutions of Disinfectants,Isolation of Staphylococcus aureus, Is Garlic Antibacteria, How Much Bacteria Is on Your Retainer, What Is the Best Way to Clean Your Toothbrush, Study of Bacteria Growth in Varying Acidic Environments, Which Acne Medications Are Most Effective, Beleaguered Beef, Study of the Health Benefits of Spicy Cooking, What Are the Effects of Ultraviolet Light on Bacteria Mortality, The Five Second Rule, Bacteria Affected by Ultra-Violet Light

 

<<Back To Topics Page........................................................................................>> Next Topic

 

 

Copyright © sciencefairprojects.co.in 2013 through 2015