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Light Color and Yeast Growth Science Fair Projects

Color Therapy for Yeast - Light Color and Yeast Growth Science Fair Projects
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Science fair projects go New Age with color therapy for yeasts...

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Unusually Pairing of Variables

It is important to develop a unique science fair project. One way to do this is to pair unusual variables in your hypothesis.

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Test bacteria on any surface with the Surface Microbes Science Fair Projects Kit: after hand sanitizer, hands, disinfectant.. for example. You can use antibiotics to test the bacteria too.

Anytime you want to test how many bacteria are On Top of a surface like a desk, skin, chicken, computer keyboard, bread dough, a hard piece of chocolate, cheese, inside of an animal's cheek, etc. then use the surface experimenter kit. The kit will let you calculate how many bacteria there are per unit surface area on the object. You can also test for e-coli, however, only the microbe water kit will let you distinguish e. coli from other coliforms and bacteria.

 

Objectives/Goals

The purpose of this experiment is to find the effect of different colored gradient-coated sunglass lenses on yeast growth after exposure to UVA rays for ten minutes. The objective is to eventually identify the gradient-coating color that most effectively blocks out UVA rays.

Methods/Materials

Ten Petri dishes containing yeast extract dextrose (YED) medium were streaked with a special UV sensitive yeast strain (G948-1C/U). The Petri dishes were divided into quadrants, three of which contained a different colored lenses while the fourth quadrant had no lens(control group). The Petri dishes were then exposed to UVA rays via a black light for ten minutes and incubated at 30 degrees Celsius for 72 hours. After this period, the dishes were removed from the incubator and the area of the regions lacking yeast growth were found and analyzed.

Results

The quadrants containing the pink gradient-coated sunglass lenses, on average, had the largest ratio of the area of the regions lacking yeast growth to the area of the sunglass lenses. On the other hand, the black gradient-coated sunglass lenses had the smallest ratio. The green gradient-coated lenses had a ratio greater than that of the black lenses yet less than that of the pink lenses. The control quadrant had absolutely no yeast growth, confirming that yeast cannot grow after exposure to UVA rays for ten minutes.

Conclusions/Discussion

Areas lacking yeast growth indicate that UVA rays were able to penetrate the lenses. Thus, the colored lens with the largest ratio is the least effective in blocking out UVA rays. Therefore, the pink-gradient coating sunglass lenses were the least effective. In contrast, the black gradient-coated lenses had the smallest ratio thereby being the most effective. This validated our hypothesis that if black gradient-coated lenses are placed on top of the Petri dish containing yeast, then there will be a smaller region lacking yeast growth after being exposed to UVA rays for ten minutes. The results also show that more opaque lenses tend to be more effective in protecting against UVA rays. 3rd party contributor


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Experiments tackle unusually questions.