harmful micro-organisms ecosystems unit, march 1, 2005
TRANSCRIPT
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Harmful Micro-organisms
Ecosystems Unit, March 1, 2005
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Ideal Growth Environment for Micro-organisms
Micro-organisms prefer environments that are:
• Warm• Moist (have water)• Dark• Have lots of air
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Harmful Effects of Some Micro-organisms
1. Rot (food, plants…)
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Harmful Effects of Some Micro-organisms
2. Illness (diarrhea, food poisoning)
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Harmful Effects of Some Micro-organisms
3. Disease (Cholera, Tuberculosis)
Bacteria that cause cholera Bacteria that cause tuberculosis
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Harmful Effects of Some Micro-organisms
4.Infect wounds
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Harmful Effects of Some Micro-organisms
5. Fungal growth (athlete’s foot)
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Harmful Effects of Some Micro-organisms
6. Bad odour (smelly feet)
Micrococci bacteria
Corynebacterium
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How Do Micro-organisms Get Inside Us?
2. Water3. Insects4. Food:
Not cooked properly Not stored properly
1. Person to Person:-Blood (sharing
needles)-Saliva (kissing)-Air (coughing and
sneezing)
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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
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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
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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
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Food Spoilage Lab:
•Which sample had the most mold?
Why?
•Which sample had the least mold?
Why?
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Bread Mold