L7W10_MIC105_HiddenMajority

L7W10_MIC105_HiddenMajority - MIC105 Lecture 8 The Hidden...

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MIC105 Lecture 8: The Hidden Majority Dealing with more uncertainty known knowns, known unknowns, unknown unknowns. ... Cultivation-independent methods to identify and quantify diversity Tuesday, January 19, 2010
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Bacterial groups with cultivated representatives (based on 16S rRNA) * Tuesday, January 19, 2010
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Bacterial Diversity Bacterial divisions/phyla Bacterial “species” or operational taxonomic units (OTUs) How to defne these species and divisions? * Tuesday, January 19, 2010
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Use phylogeny to defne Monophyletic groups supported by bootstrap Bacterial division (<85% 16S rRNA identity) Bacterial “species” or OTU = (<97% 16S rRNA) Sequence “type”= “phylotype” “candidate divisions”: those groups only known by sequence (not by isolated organisms) * *** more on species defnitions later… Tuesday, January 19, 2010
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Bacterial groups with cultivated representatives (based on 16S rRNA) * Tuesday, January 19, 2010
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Remember- We expect evolutionarily related organisms (share a common ancestor) to share some common biological features Caution: phylotype doesn’t necessarily predict phenotype (esp. respiration or metabolism) Gamma proteobacteria example * Tuesday, January 19, 2010
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* Tuesday, January 19, 2010
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Various phenotypes of Proteobacteria Purple phototrophic Bacteria The nitrifying Bacteria Sulfur and iron oxidizing Bacteria Hydrogen oxidizing Bacteria Methanotrophs and methylotrophs Pseudomonas and the Pseudomonads Acetic acid Bacteria Free living aerobic nitrogen ±xing Bacteria Neisseria and Chromobacterium Enteric Bacteria Vibrio and photobacterium Rickettsia Spirilla Sheathed proteobacteria
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This note was uploaded on 02/16/2011 for the course MIC 105 taught by Professor Wheelis during the Spring '08 term at UC Davis.

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L7W10_MIC105_HiddenMajority - MIC105 Lecture 8 The Hidden...

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