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Microbiology first lecture- jan 20

Microbiology first lecture- jan 20 -...

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Overview of the Microbial World
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What are we studying?  . . . The unseen world From McKane & Kandel, Microbiology: Essentials & Applications (2 nd ed), McGraw-Hill, 1996
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Humans and Microbes . . . We inhabit ‘their’ world. . .   N-fixing bacteria on root tip Bacteria in soil Bacteria in water
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Humans and Microbes They inhabit our bodies –  colonization begins at birth. Normal microbiota, mouth Normal microbiota, ileum Bacteria on skin
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Microbes are essential to ALL life  forms on planet Earth Oxygen production - Photosynthetic prokaryotes, cyanobacteria - Photosynthetic eukaryotes, single-cell algae Bacteria “fix” atmospheric nitrogen - N 2  not usable by plants or animals - NH 3  used by plants >> animals Decomposition / recycling of organic matter
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Other Roles of Microorganisms Cellulose degradation allows ruminant animals (and termites) to derive energy from wood Production of: Fermented foods Cheese, yogurt etc Industrial chemicals acetone Pharmaceuticals Antibiotics Biofuels
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First Reported Sighting Antoni van Leeuwenhoek [late 17 th century]
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