nester01 - Chapter 1: Humans and the Microbial World...

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Chapter 1: Humans and the Microbial World
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Nosocomial Infections A Nosocomial Infection is a hospital- or clinic- acquired Infectious Disease . Nobody goes into medicine in order to prevent Nosocomial Infections . Nevertheless, to practice medicine you must be able to prevent Nosocomial Infections . To prevent Nosomial Infections you need to have some understanding of microbiology. Oh yes, and Infectious Disease , in general, is kind of important to medicine, too. At the very least, you should be striving to Do No Harm ! And avoiding harming by infection requires some reasonable knowledge of microbiology.
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Microbiology, b. 1674 Microscope of Antony van Leeuwenhoek (1632-1723)
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Microbiology, b. 1674 Microscope of Antony van Leeuwenhoek (1632-1723) Note that images will dissolve in if you are responsible for them and/or I’ll circle or “square” in blue the parts of these images you are particularly responsible for). Note that blue text you are very responsible for, “black” less so, and red only in the form of bonus questions.
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What is Microbiology? Microbiology is the Science that studies Microorganisms. Microorganisms, roughly, are those living things that are too small to be seen with the naked eye. Microorganisms cannot be distinguished Phylogenetically from “Macroorganisms” For example, many fungi are microorganisms, as well as all bacteria, all viruses, and most protists. Microbiology is more a collection of techniques: Aseptic technique Pure culture technique Microscopic observation of whole organisms A microbiologist usually first isolates a specific microorganism from a population and then cultures it (i.e., in pure culture).
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Microbiology b. >3 billion BC “It is generally believed that microorganisms have existed on earth for several billion years, and over time, plants and animals have evolved from microorganisms.” Above is a fossil cyanobacterium that is 950 million years old. “Microorganisms are… very diverse in all their aspects: appearance, metabolism, physiology, and genetics. They are far more diverse [in these terms] than plants and animals.”
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Origin of Microbes: Redi’s Exp.
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Origin of Microbes: Spontaneous Generation Myths Snakes from horse hairs in stagnant water Mice from grain and cheese wrapped in a sweater Maggots from rotting meat Fleas from hair Flies from fresh and rotting fruit Mosquitoes from stagnant pondwater Eels from slimy mud at the bottom of the ocean Locusts from green leaves Raccoons from hollow tree trunks Termites are generated from rotting wood
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Pastuer (1861) Refuted Spont. Gen.
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nester01 - Chapter 1: Humans and the Microbial World...

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