1. Harmful Micro-organisms Ecosystems Unit, March 1, 2005

2. Ideal Growth Environment for Micro-organisms Micro-organisms prefer environments that are: Warm Moist (have water) Dark Have lots of air

3. Harmful Effects of Some Micro- organisms 1. Rot (food, plants…)

4. Harmful Effects of Some Micro- organisms 2. Illness (diarrhea, food poisoning)

5. Harmful Effects of Some Micro- organisms 3. Disease (Cholera, Tuberculosis) Bacteria that cause choleraBacteria that cause tuberculosis

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

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

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

9. How Do Micro-organisms Get Inside Us? 2. Water 3. Insects 4. Food: ­ Not cooked properly ­ Not stored properly 1. Person to Person: -Blood (sharing needles) -Saliva (kissing) -Air (coughing and sneezing)

10. 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

11. 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

12. 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

13. Food Spoilage Lab: Which sample had the most mold? Why? Which sample had the least mold? Why?

14. Bread Mold