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Biology Extended Essay

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I'm doing my biology EE on the effect of either blueberries/cranberries on inhibiting growth of E. coli.

I know it doesn't sound very special or unique, so I've made some variations and I was wondering if anyone could give me some advice? 


1) Effect of different processing of blueberries on antimicrobial effect (eg fresh/raw, frozen, juice, canned) - but the main problem with this it's hard to find materials without added sugar or preservatives


2) Comparing antimicrobial effect of cranberry juice, dried cranberries, frozen cranberries with processed cranberry pills (for UTI)? - the problem with this one is I can't find any natural cranberries so I'm not sure if that's a bad thing??


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For (1), you can look into Organic Blueberries/ Cranberries, which should be available at a nearby supermarket/ farm. They contain almost no additives such as preservatives and sugars.

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