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Summary for Chapter 10

Summary for Chapter 10. Taxonomy Identification and classification of microbes Dichotomous keys Cladograms. Scientific names and meanings. Organisms within a genus share 93% similar rRNA Organisms within a species share 97% similar rRNA. Hierarchy of classification.

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Summary for Chapter 10

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  1. Summary for Chapter 10 • Taxonomy • Identification and classification • of microbes • Dichotomous keys • Cladograms

  2. Scientific names and meanings Organisms within a genus share 93% similar rRNA Organisms within a species share 97% similar rRNA

  3. Hierarchy of classification Figure 10.5 (2 of 3)

  4. Species defined Eukaryotic species: A group of closely related organisms that breed among themselves Prokaryotic species: A population of cells with similar characteristics Clone: A population of cells derived from a single cell Strain: A subgroup within a species with one or more characteristics that distinguish it from other subgroups in the species Viruses: A population of viruses with similar characteristics that occupy a particular ecological niche

  5. Species identification and classification methods General 1. Morphological characteristics Additional tests 1. Differential staining 2. Biochemical tests- determine presence of enzymes - Numerical identification 4. Genetic homology (similarity of DNA) - Base composition - DNA and RNA sequencing (16s rRNA gene) - DNA hybridization 5. Protein and amino acid homology (similarity of proteins) - Western blots - Amino acid sequences 6. Immunological methods - ELISA (enzyme linked immunosorbent assay) - Western blots

  6. Figure 10.9 One type of rapid identification method for bacteria: EnteroPluri test from BD Diagnostics. One tube containing media for 15 biochemical tests is inoculated with an unknown enteric bacterium. Numerical identification: the Enterotube After incubation, the tube is observed for results. Phenylalanine Arabinose Ornithine Adonitol Glucose Sorbitol Lactose Dulcitol Urease Citrate Lysine Indole V–P Gas H2S The value for each positive test is circled, and the numbers from each group of tests are added to give the code number. 4 Comparing the resultant code number with a computerized listing shows that the organism in the tube is Citrobacter freundii. Code Number Microorganism Atypical Test Results 62342 Citrobacter freundii Citrate Citrobacter freundii None 62343 Figure 10.9 - Overview (1 of 3)

  7. Species identification and classification methods General 1. Morphological characteristics Additional tests 1. Differential staining 2. Biochemical tests- determine presence of enzymes - Numerical identification 4. Genetic homology (similarity of DNA) - Base composition - DNA and RNA sequencing (16s rRNA gene) - DNA hybridization 5. Protein and amino acid homology (similarity of proteins) - Western blots - Amino acid sequences 6. Immunological methods - ELISA (enzyme linked immunosorbent assay) - Western blots

  8. Enzyme Linked Immunosorbent Assay (ELISA) bbc.co.uk

  9. Criteria for classifying/ identifying bacteria Table 10.5

  10. Classification and identification references

  11. Tools of identification: the dichotomous key Figure 10.8

  12. Tools of identification: the dichotomous key

  13. Figure 10.19 Building a cladogram.

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