Lecture 2-7 - Lecture 7 Microbial Diversity 3/1/2011...

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Lecture 7 Microbial Diversity 3/1/2011 © Nicola Davies 2011 Microbial Diversity Lecture 7 March 1, 2011 2 Microbial Diversity We have been studying commonalities Microbes exhibit more diversity than any other living group Most species remain to be catalogued Categorize for study and data management Originally grouped by common characteristics Now also use phylogenies Repeated reclassifications over time Microbes grouped together because of their size Does not indicate relatedness Microorganisms found in all three domains 3 4 5 Discovery of Microbial Species Microorganisms once believed to be members of one species Environment causes rapid population shifts Believed to be different developmental stages Polymorphism described the changes Work with pure cultures (started from one cell) dispelled confusion Variety of species became apparent Relatively unchanging throughout life Koch instrumental in new scientific methods 6 What is a Species? Higher taxa are human constructs
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Lecture 2-7 - Lecture 7 Microbial Diversity 3/1/2011...

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