lecture 1 overview of microbiologyeta.health.usf.edu/.../lecture1/phc6562_lecture1... · aa©2012...
TRANSCRIPT
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Lecture 1 Overview of Microbiology
Part 1 Microbiology: historical perspectives and
current microbial challenge
Part 2; A and B Classification of Microorganisms
(Part 2A)
Microscopes (Part 2B)
Chapter 1 and 3 preview (Part 2B)
(Cowan/Tolaro
Microbiology: A System’s Approach)
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Cellular Microorganisms: The Theory of Cells
Living things are made of cells
Cells arise from preexisting cells
All cells contain nucleus and cytoplasm enclosed in a semi-permeable membrane, some cell-wall
Energy & metabolism; chemical reactions convert food into energy
Cells grow & divide, respond to environment, and can mutate
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Cellular Microorganisms: Types of Cells
Prokaryotes
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Eukaryotes
Fig. 1.5: Cowan
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Eukaryote
• Fungi e.g. yeasts, moulds
Microscopic animals
• Protozoa (unicellular) e.g. amoebae, malarial parasites
• Helminthes (multicellular) e.g. tapeworms, flukes, roundworms
Microscopic plants
• Algae (all non-pathogenic)
Prokaryotes
• Bacteria
• Actinomycetes (filamentous bacteria), e.g. Streptomyces
• Rickettsias (parasitic intracellular bacteria)
• Rickettsias
• Chlamydias
• Mycoplasmas (bacteria without cell walls)
• Phototrophic bacteria (produce oxygen in sunlight)
• Cyanobacteria, e.g. blue-green algae
• Photosynthetic, e.g. purple, purple sulphur bacteria
Viruses and prions: non-cellular organisms
CLASSIFICATION OF MICROORGANISMS
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Main Types of Microorganisms: 1) Bacterium, 2) Fungus, 3) Algae 4) Virus, 5) Protozoan, 6) Helminth.
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Microorganisms vary in size –
1µm to
200 nm.
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Relative Microbial Sizes
If poliovirus (27 nm) was the size of a quarter…
Staphylococcus aureus (0.8 µm)
Escherichia coli (0.7 x 2.5 µm)
Saccharomyces cerevisiae (5 µm)
Paramecium caudatum (50 x 250 µm)
Amoeba proteus (800 µm)
McGraw-Hill 2011
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Blood agar
Mannitol salt agar
MacConkey agar
Bacterial Agar Media
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Escherichia coli
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Chlamydia Life Cycle
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Gram positive cocci Gram negative bacilli
Gram Stain
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Pathogenic Bacteria
Clostridium perfringens
Treponema pallidum
Bacillus anthracis
Mycobacterium tuberculosis
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Structures Associated with Bacteria
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Flagella
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Fimbrae
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Capsules
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Spores
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Acellular Microorganisms
Viruses
Prions
Viroids
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Principles of Molecular Virology, Cann, Alan, 2001
Viruses take over your cells!!
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Herpes Virus in Cells
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Prions
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Aspergillus fumigatus
Penicillium species
Candida albicans
Fungus and Mold
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Protozoa
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Lecture 1, Part 2A Overview of Microbiology
Microbiology: historical perspectives and current microbial challenge
Classification of microorganisms
Microscopes
Chapter 1 and 3 preview
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