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The Sweet Smell of.....E.coli?

We tried to get our device to work by using both UV light and fluorecent light. We used times of 10 sec, 1 min and 5 minutes. We repeated the exposure after 1 hour. We performed a smell test and pH test: before the initial light treatment, at 30 mins, 1 hour, and 2 hours. We performed each time test in triplicate. In all tests, no wintergreen smell was detected and the pH did not go up as predicted from our earlier pH tests with the original wintergreen part with TetR promoter. We will do a smell check and UV check in the morning and again in the afternoon tomorrow to see if wintergreen smell is detectable or a pH change has occured.