Transcript Bacteriology

Why do
we care?
Pathology
Hansen’s Disease
Bubonic Plague
Pathology
PLAGUE CURES
HOW THEY WORK
The smells would help
Carry flowers or wear
to ward away the
a strong perfume
disease
WHAT THEY REALLY DID
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
Fermented Foods
Medical Research
Medications
 Vaccines
 Restriction
enzymes

Environmental Issues
 Decomposition
 Ethanol
 Insecticides
 Nitrogen
fixation
Genetic Recombination
 Transformation
Bacterium
Plasmid with
ampicillin
resistance
absorbs DNA from environment
Genetic Recombination
 Conjugation
 Pilus
extends between cells
 Copy of a plasmid is donated
Plasmid with
ampicillin
resistance
Plasmid with
ampicillin
resistance
Genetic Recombination
 Transduction
Virus
carries host DNA to next host
Gene with
ampicillin
resistance
Gene with
ampicillin
resistance
Oxygen Tolerance
Obligate
Anaerobes
Facultative Anaerobes
Obligate Aerobes
Bacterial Size
Bacterial Morphology
Bacterial Morphology
Coccus
Diplococcus
Streptococcus
Staphylococcus
Outer Coverings
 Cell
Membrane
 Wall (peptidoglycan)
 Gram+
•Simple, thick wall
 Gram
•Thin wall
•Outer membrane
 Capsule
 Adheres
cell to food
 Disguises against host
immune system
+
-
A
C
B
E
D
H
F
G
I
Endospores
 DNA,
ribosomes, and some
cytoplasm encased
 Bacterial defense against
temperature, pH, chemicals,
and aridity
When Bacteria Attack
 Invasion
Cells
consume host tissues
Streptococcus mutans
•Cells live on surface of teeth
•Exposure to sugar enables
production of…
•Plaque
•Acid
When Bacteria Attack
Exotoxins
 Poisons released
to weaken host
 Clostridium botulinum
 Clostridium tetani
 Vibrio cholerae
When Bacteria Attack
Endotoxins
Poisons
located in outer membrane
Escherichia coli, Salmonella