1. The Good, the Bad and the Ugly
Micro-Organisms
The Good, the Bad and the Ugly

2. Micro-Organisms
Micro-organisms can be both beneficial and harmful to humans
They play an important role in our daily lives and our food supply

3. Molds: Penicillin
Antibacterial Activity (clear area indicates Penicillin is “killing” the bacteria)
Bacteria (Brown Slime)
Penicillin Mold (While Circle)

4. Discovered in 1928 by Scottish born, Sir Alexander Fleming
While growing bacteria in his lab, he noticed that one of his samples had a fungus mold growing in it that was killing the bacteria.
This mold (Penicillin) was able to kill the cell walls of bacteria.

5. Mold is added to blue cheese to give it its unique flavour, colour and smell!

6. Soy Sauce production uses mold to ferment a soybean/ wheat mixture to give it a unique taste, deep brown colour, and intense aroma.

7. Yeast and Baking
When yeast is given sugar (sugar, wheat, grain…) it begins to ferment and produce CO2 and ethanol (alcohol).
Fermentation:
Yeast + C6H12O6  2C2H5OH + 2CO2
Baking (Rising Bread)
Yeast + Sugar = Ethanol + Carbon Dioxide

8. Bacteria and Yogurt
A special bacteria called Lactobacillus bulgaricus are able to turn milk into a thick creamy yogurt.
The bacteria found in yogurt are very good for your health. (Activia Challenge-probiotics)
Bacteria is used to make cheese.

9. Algae
Algae are used in ice cream, milkshakes, puddings, salad dressings, Jello®, peanut butter, toothpaste etc. to help thicken the mixture.
Look for these algae ingredients: carrageenan, alginate, and beta carotene.

10. Harmful Effects of Some Micro-organisms
Rot (food, plants…)

11. Harmful Effects of Some Micro-organisms
Illness (diarrhea, food poisoning)

12. Harmful Effects of Some Micro-organisms
Disease (Cholera, Tuberculosis)
Bacteria that cause cholera
Bacteria that cause tuberculosis

13. Harmful Effects of Some Micro-organisms
4.Infect wounds

14. Harmful Effects of Some Micro-organisms
5. Fungal growth (athlete’s foot)

15. Harmful Effects of Some Micro-organisms
6. Bad odour (smelly feet)
Micrococci bacteria
Corynebacterium

16. Protecting Ourselves Against Harmful Micro-organisms
Person to Person:
Wash your hands often
Cover your nose and mouth when you cough or sneeze
Avoid kissing people if you are sick

17. Protecting Ourselves Against Harmful Micro-organisms
Water:
Filter the water
Disinfect Water (e.g. chlorine, UV radiation)
Avoid drinking from unknown water sources
Insects:
Wear bug spray
Wear protective clothing
Avoid scented products

18. Protecting Ourselves Against Harmful Micro-organisms
Food:
Wash and clean food
Cook food properly
Reheat at high temperature
**Store food properly
Dispose of old food