Lec1_Basic_Overview_of_Microbiology

Lec1_Basic_Overview_of_Microbiology - Basic Overview of...

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Basic Overview of Microbiology
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Microbiological Classification of Infectious Diseases Disease is a disturbance in the state of health Microbes cause disease in the course of stealing space, nutrients, and/or living tissue from their symbiotic hosts (e.g., us) To do this, microbes do most of the following: Gain access to the host (contamination) Adhere to the host (adherence) Replicate on the host (colonization) Invade tissues (invasion) And produce toxins or other agents that cause host harm (damage)
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Microbiological Classification of Infectious Diseases Viral Single or Double Stranded DNA or RNA Bacterial Gram positive Gram negative Fungal Parasitic Helminth Protozoa Prions
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Microbiological Classification of Infectious Diseases
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Comparison of Eukaryotes and Prokaryotes Characteristic Eukaryotes Prokaryotes Form Multicellular Single cells Nucleus Nuclear membrane DNA in contact with cytoplasm Organelles Membrane-bound organelles present No organelles Sterols Always Only in Mycoplasma Ribosomes 80s = 40s + 60s 70s = 30s + 50s Cell wall Absent or cellulose/chitin Peptidoglycan Mitosis Yes No
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Size Comparison of Microbes
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Size Comparison of Microbes
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Bacterial Cell Structure James D. Dick, PhD, Johns Hopkins University
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Microbiological Classification of Infectious Diseases Bacteria can be: Chemoheterotrophs Organisms that obtain energy by the oxidation of electron donors in their environment but are unable to fix carbon and form their own organic compounds Photoheterotrophs Organisms that carry out photosynthesis to acquire energy but use organic compounds to build structures. Chemoautotrophs Organisms that derive energy from chemical reactions and synthesize all necessary organic compounds from carbon dioxide Photoautotrophs Organisms that carry out photosynthesis to acquire energy and can fix carbon
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Strain O157:H7 Taxonomy of Bacteria
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Microbiological Classification of Infectious Diseases Bacteria are classified by their Gram stain characteristics. Gram staining is the application of a crystal violet dye to a culture of bacteria. Bacteria that retain the color of the dye are called Gram positive; bacteria that don't are Gram negative. The Gram stain attaches to peptidoglycan in the bacterial cell wall. In Gram-negative bacteria, the peptidoglycan layer is protected by an outer membrane.
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Microbiological Classification of Infectious Diseases
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Microbiological Classification of Infectious Diseases
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Microbiological Classification of Infectious Diseases The second criteria used to classify bacteria is their shape.
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  • Fall '10
  • A
  • Bacteria, Microbiological Classification, Diagnostic Microbiology

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