BIO 105 Lecture Notes - Lecture 4: Petri Dish, Microbiological Culture, Archaea
5 Feb 2017
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Document Summary
Domains -- all life on earth can be categorized in 3 domains. They are everywhere we are in constant contact with prokaryotes. The good outnumber the bad (the pathogens that make us sick) Microbiome -- prokaryotes make up structure for normal bodily processes and functions. Robert koch -- 1800s - germ theory of disease. Studied organisms isolated with diseases took a sample and grew the microorganism on a petri dish injected microorganism into healthy organisms to find the cause of the disease. Four postulates for judging whether a given bacteria is the cause of a disease: The bacteria must be present in every case of the disease. The bacteria must be isolated from the host with the disease and grown in pure culture. The specific disease must be reproduced when a pure culture of the bacteria is inoculated into a healthy susceptible host. The bacteria must be recoverable from the experimentally infected host.
