1. Bacteria in the World Around Us
Bacteria and Us!!
Bacteria in the World Around Us

2. Good for the Environment
Most bacteria are harmless/helpful to humans
Bacteria are involved in
Nitrogen Fixation
Environmental recycling
Environmental Cleanup

3. The Role of Bacteria in Nature
Environmental Recycling
Heterotrophic Decomposers
Organisms that break down large chemicals in dead organisms into small chemicals
“Natures Recyclers”
Bacteria break down leaves on ground
Nitrogen Fixing Bacteria
Live in soil and swellings on the roots of plants
Convert nitrogenous gas from air into nitrogen products plants need
Called Nitrogen Fixation

4. The Role of Bacteria in Nature
Environmental Clean-up
Bioremediation
Convert poisonous chemicals in oil into harmless substances
Oil eating bacteria
Used in oil spills and gas leaks
Chemical spills
farmers

5. Good for People Food Production
Bacteria help make
Cheese
Sauerkraut
Yogurt
Pickles!!!!!!
Breaks down lactose into lactic acid
Makes food taste better!!!
Milk and other foods goes through pasteurization-
Food is heated up to temperature that is high enough to kill harmful bacteria without changing the taste of that food
Named after Louis Pasteur

6. Good for People Makes medicine Insulin Genetic Engineering Antibiotics
1970’s genes were put in bacteria
Makes insulin and then given to diabetics
Genetic Engineering
Changing genes
Insecticides
Cleansers
Adhesives

7. Good in your Body Bacteria in your digestive system Digest food
Make vitamins
Compete with disease causing organisms preventing harmful bacteria

8. Harmful Bacteria Humans Plants Pathogenic bacteria
Cause disease
Get in host and take nutrients
Protected by vaccinations
Antibiotics
Plants
Damage to grain crops
Damage to trees

9. Bacteria How can you kill bacteria?
What are the three shapes of bacteria?
What is one way bacteria helps us?