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Bacteria in your life

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Help absorption of vitamin K. Lactobacillus digest lactose ... Used to kill organisms caused tuberculosis, typhoid. Sterilization. Uses high heat and pressure ... – PowerPoint PPT presentation

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Title: Bacteria in your life


1
Section 2
  • Bacteria in your life

2
Beneficial Bacteria
  • Intestinal bacteria
  • Help digest food
  • Help absorption of vitamin K
  • Lactobacillus digest lactose
  • E coli most harmless

3
Antibiotics
  • Limit growth of bacteria
  • Some bacteria produce antibiotics
  • Streptomycin produced by soil microbes

4
saprophytes
  • Consumes dead organisms
  • Clean earth
  • Break down sewage waste

5
Bioremediation
  • Use of microorganisms clean up environmental
    pollutants
  • Oil spills
  • Use pollutants as food source

6
Nitrogen fixing bacteria
  • Changes nitrogen in air to form useful to plants
  • Pg 197
  • Bacteria enters roots of plants
  • Nodules full of bacteria
  • Bacteria fixes nitrogen and plant supplies food

7
Nitrogen fixing bacteria
  • Saves farmers money
  • Use as fertilizer
  • Cyanobacteria provides nitrogen to aquatic
    organisms

8
Foods
  • Yogurt cheese
  • Bacteria breaks milk proteins
  • Curds and whey
  • Type of cheese depends on type of bacteria
  • http//www.science-projects.com/favicon.ico

9
Harmful bacteria
  • Pathogen cause disease
  • Produce poisonous substances - toxins

10
Botulism
  • Food poisoning
  • Causes paralysis or death
  • Produce toxins in sealed cans
  • Produce endospores survive harsh conditions

11
Pasteurization
  • Louis Pasteur used wine
  • Heating food to high temp 71.6 C held for 15
    seconds quickly cooled
  • Doesnt kill all microbes
  • Used to kill organisms caused tuberculosis,
    typhoid

12
Sterilization
  • Uses high heat and pressure
  • Kills all bacteria

13
Treating disease
  • Penicillin prevents bacteria making cell wall
  • Inhibits protein synthesis
  • Broad spectrum- kills many organisms
  • Vaccines prevent disease
  • Made from dead bacteria or parts of cell walls
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