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Özkan, Seben (2014) INVESTIGATING THE CHANGE IN GRAM NEGATIVE AND POSITIVE BACTERIA NUMBER PRESENT ON TOP OF THE BEVERAGE CANS BEFORE AND AFTER CLEANING THE REGION AND COMPARING THE NUMBERS WITHIN THE CLEANING METHODS WHICH ARE CLEANING WITH TISSUE, WET WIPE, TAP WATER AND SOAPY WATER. Other thesis, TED ANKARA KOLEJİ.