Download CHAPTER 7 BACTERIA

CHAPTER 7 BACTERIA
SECTION 2
BACTERIA IN YOUR LIFE
BACTERIA THAT HELP YOU
 Some in digestive system
 Lots in your large intestine
 Help you stay healthy
 Some produce antibiotics
BACTERIA AND THE ENVIRONMENT
 Some are consumer bacteria called saprophytes – eat dead things
 Help recycle nutrients
 Saprophytes are used in sewage treatment plants
 Plants and animals need nitrogen
 Nitrogen-fixing bacteria (n-fb) change nitrogen into form they can use
 Some plants have nodules that contain n-fb – peanuts, peas
 N-fb save farmers millions of dollars each year in fertilizer
BIOREMEDIATION
 Using organisms to clean up environmental pollution (oil spills ) and break down
waste
BACTERIA AND FOOD
 Use bacteria for making food – yogurt, cheese, sauerkraut, vinegar, pickles, etc.
BACTERIA IN INDUSTRY
 Are grown in bioreactors
 Make medicines, enzymes, cleansers, and adhesives
 Break down plant and animal waste in landfills
 Bacteria produce large amounts of methane gas to produce fuel
HARMFUL BACTERIA
 Some are pathogens that cause diseases like strep, tetanus, and whooping cough
HOW PATHOGENS MAKE YOU SICK
 Can enter body through a cut
 Can inhale them
 They multiply in your body
 Produce poisonous toxins, such as botulism in food
 Some are protected in endospores and can be dormant for hundreds of years
PASTEURIZATION
 Food needs to be pasteurized to kill bacteria
 Food heated to sterilizing temp.
 Ex. Milk and some juices
TREATING BACTERIAL DISEASES
 Use antibiotics, such as penicillin
 Vaccines from bacteria cell walls can prevent some diseases
 Injected into the body