Page:Bacteria, why do they make me sick?.pdf/54



Materials: • Three 17 oz clean plastic bottles • 3 cups of warm boiled water • 1 beef bouillon cube • Bowl to dissolve the bouillon cube • 1 spoon (15 mL) • Vinegar • Salt • Permanent marker

Dissolve the beef bouillon cube in 3 cups of water. Distribute the content in the three bottles (1 cup per bottle). In the first bottle, add 5 tablespoons of salt. In the second one, add 5 spoons of vinegar. And in the third one, do not add anything. The third one will be the control bottle. Label each bottle to easily distinguish them and place them in a warm place. Incubate for five days. After the incubation period, analyze the bottles and compare their turbidity or lack of transparency. Higher turbidity levels indicate greater growth of microorganisms.