Why do we care?
Pathology
PLAGUE CURES HOW THEY WORK WHAT THEY REALLY DID Carry flowers or wear a strong perfume The smells would help to ward away the disease Nothing Coat the victims with mercury and place them in oven. Combination of mercury and heat would kill disease. Mercury is poisonous and the oven caused serious burns. Give a strong dose of laxatives Disease is defecated out Strong doses of laxatives can cause death from dehydration. Pathology
Pathology
Escherichia coli Pathology
Genetic Recombination Transformation Bacterium absorbs DNA from environment Bacterium absorbs DNA from environment Plasmid with ampicillin resistance
Genetic Recombination Conjugation Pilus extends between cells Pilus extends between cells Copy of a plasmid is donated Copy of a plasmid is donated Plasmid with ampicillin resistance
Genetic Recombination Transduction Virus carries host DNA to next host Virus carries host DNA to next host Gene with ampicillin resistance
Oxygen Tolerance Obligate Anaerobes Facultative Anaerobes Obligate Aerobes
Bacterial Size
Bacterial Morphology
CoccusDiplococcusStreptococcusStaphylococcus
Outer Coverings Cell Membrane Wall (peptidoglycan) Gram + Gram + Simple, thick wallSimple, thick wall Gram - Gram - Thin wallThin wall Outer membraneOuter membraneCapsule Adheres cell to food Adheres cell to food Disguises against host immune system Disguises against host immune system
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A B C D I H G F E
DNA, ribosomes, and some cytoplasm encased Bacterial defense against temperature, pH, chemicals, and aridity
When Bacteria Attack Invasion Cells consume host tissues Cells consume host tissues Streptococcus mutans Streptococcus mutans Cells live on surface of teethCells live on surface of teeth Exposure to sugar enables production of…Exposure to sugar enables production of… PlaquePlaque AcidAcid
When Bacteria Attack Exotoxins Poisons released to weaken host Poisons released to weaken host Clostridium botulinum Clostridium botulinum Clostridium tetani Clostridium tetani Vibrio cholerae Vibrio cholerae
When Bacteria Attack Endotoxins Poisons located in outer membrane Poisons located in outer membrane Escherichia coli, Salmonella Escherichia coli, Salmonella