3. Results

We have classified the levels of Colonies in Petri Dishes according to the scale below
1- No growth at all
2- Little, barely visible signs of growth
3- Colony easily spotted
4- Almost half plate has colonies
5- Plate full of colonies

Results for Bacillus Subtilise are as follows

Petri dishes with B.subtilis colonies
Results for E.coli

Fig 10: Petri dishes with E.coli colonies
As we did not find our results accurate, we did another test but removed the 60 minute of petri dish as we found that both our bacteria could not grow after UV exposure longer than that.

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