MicrobialGroups_Spr_2010

MicrobialGroups_Spr_2010 - MICROBIAL GROUPS A....

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Unformatted text preview: MICROBIAL GROUPS A. Organizational principles (diversity, abundance, activity - Dr. Kukor) MICROBIAL GROUPS A. Organizational principles (diversity, abundance, activity - Dr. Kukor) 1. Phylogenetic groups - ordering based on evolutionary relatedness - genotypic analyses MICROBIAL GROUPS A. Organizational principles (diversity, abundance, activity - Dr. Kukor) 1. Phylogenetic groups - ordering based on evolutionary relatedness - genotypic analyses 2. Taxonomic groups - science of classification, identification, nomenclature Escherichia coli , Escherichia coli , E. coli- includes phylogeny (necessary but not sufficient) MICROBIAL GROUPS A. Organizational principles (diversity, abundance, activity - Dr. Kukor) 1. Phylogenetic groups - ordering based on evolutionary relatedness - genotypic analyses 2. Taxonomic groups - science of classification, identification, nomenclature Escherichia coli , Escherichia coli , E. coli- includes phylogeny (necessary but not sufficient) 3. Morphological groups - Gram stain, G+, G- - reflected in name Lactobacillus, Rhodospirillum, Streptococcus Cell Wall Unique structure in bacteria peptidoglycan - amino sugars e.g. muramic acid polymeric cross linked by a.a. strength and rigidity Two classes: Gram positive Gram negative -operationally defined 1884 Important structural differences G+ ~90% peptidoglycan structured in layers G- ~10% peptidoglycan MICROBIAL GROUPS A. Organizational principles (diversity, abundance, activity - Dr. Kukor) 1. Phylogenetic groups - ordering based on evolutionary relatedness - genotypic analyses 2. Taxonomic groups - science of classification, identification, nomenclature Escherichia coli , Escherichia coli , E. coli- includes phylogeny (necessary but not sufficient) 3. Morphological groups - Gram stain, G+, G- - reflected in name Lactobacillus, Rhodospirillum, Streptococcus 4. Habitat and function - marine or freshwater, gut or oral, photosynthetic or non-photosynthetic, endosymbiont or free-living MICROBIAL GROUPS A. Organizational principles (diversity, abundance, activity - Dr. Kukor) 1. Phylogenetic groups - ordering based on evolutionary relatedness - genotypic analyses 2. Taxonomic groups - science of classification, identification, nomenclature Escherichia coli , Escherichia coli , E. coli- includes phylogeny (necessary but not sufficient) 3. Morphological groups - Gram stain, G+, G- - reflected in name Lactobacillus, Rhodospirillum, Streptococcus 4. Habitat and function - marine or freshwater, gut or oral, photosynthetic or non-photosynthetic, endosymbiont or free-living 5. Oxygen utilization - aerobic, anaerobic, facultative: refers to organisms - oxic, anoxic, microaerophilic: refers to habitat MICROBIAL GROUPS A. Organizational principles (contd) 6. Carbon and Energy utilization C source Energy source Heterotrophs organic C organic C -chemoorganotrophs Autotrophs inorganic CO 2 inorganic reactions - chemosynthesis =chemolithotrophs - phtosynthesis inorganic CO 2 light O 2 no O...
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MicrobialGroups_Spr_2010 - MICROBIAL GROUPS A....

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