bacteriologyToPost-2 - Lecture 2 January 11 Todays Outline...

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Lecture 2: January 11 Today’s Outline Bacteriology What are germs Defenses against disease Bacterial vs human cells Announcements 1st Discussions this week Quiz on DF p. 1-64 Overrides this week
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What Causes Typhoid Fever Rod-shaped bacterium- salmonella typhi Grows in the small intestine Fecal contamination responsible for transmission Closely related to salmonella enterica Causes food poisoning
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What are Bacteria?
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Three Basic Forms of Life Bacteria Germs and decomposers Archaea Less well known--usually in extreme places Eukarya Plants, animals, algae, fungi, amebas, etc.
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Amazing Facts about Microbes (Bacteria & Archaea) More than 5,000 species described but likely that tens of millions exist Number of bacteria that live in and on you vastly outnumbers the total cells in your body Dominant life form on earth may be a species of bacterial plankton (at surface of sea water) Found everywhere, in extreme habitats
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Bacterial size variety, but typical ca. 1µm long 1µm = 10 -6 m = 0.000004inches 25,400 end to end per inch! feces is ca. 50% bacteria ca. 10,000,000,000 bacteria per gram (sugar cube size)
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Good Germs Nitrogen fixation Oxygen production Decompose organic material for recycling Otherwise it all ends up in the ocean Normal flora are protective Cleansing, digestive, protective Probiotics--heard of them?
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Are Good Germs Located Everywhere in the Human Body?
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Where are human germs? On the skin On (in) the GI tract On (in) the urogenital tracts Rarely inside internal organs, blood, lymph, or nervous system
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Defining some terms
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