The Role of Bacteria in Infection
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The Role of Bacteria in Infection
M. Stafford
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What is a Prokaryote?
• Unicellular
• Lacks a nucleus
• Small 1-5 micrometers
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Bacteria are Examples of Prokaryotic Cells
• Two Kingdoms
• Eubacteria – found everywhere
• Archaebacteria – found in harsh environments
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Shapes of Bacteria
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Growth and Reproduction
• Binary Fission
• Conjugation• Spore Formation -
endospore
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Importance of Bacteria
• Producers• Decomposers• Many human uses
Soil bacteria
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Bacteria and Disease
• Some use cells for food
• Example Mycobacterium causes tuberculosis
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• Some release toxins
• Example – Streptococcus
• Releases a toxin that can cause a rash and scarlet fever
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• Diphtheria – Corynebacterium diphtheria infects the throat and releases toxins into the bloodstream.
• Destroys tissues can cause heart failure, paralysis and death
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Preventing Bacterial Disease
• Your first line of defense against bacterial infection is your skin
• Wash your hands
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Preventing Bacterial Disease
• Vaccine – a weakened or killed pathogen that is used to stimulate the body’s immune system
• Antibiotic – blocks the growth and reproduction of bacteria
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Fleming - penicillin
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Control of Bacteria
• Sterilization by heat• Disinfectants• Food storage and
processing
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Video – Killer microbe
• 8 minutes