1-Microbial-Taxonomy-and-Systematics.pdf

Microbial Taxonomy and Systematics Assoc. Prof. Zeus S. Elumba, Ph.D. Notice: This material is provided to you as a study material/guide in Bio 43 (General Microbiology). You are not permitted to share this material either in electronic or printed forms including uploading it...

Microbial Taxonomy and Systematics Assoc. Prof. Zeus S. Elumba, Ph.D. Notice: This material is provided to you as a study material/guide in Bio 43 (General Microbiology). You are not permitted to share this material either in electronic or printed forms including uploading it in the public databases. Definitions: y g o identifying, Taxonomy – the theory and practice in describing, o l naming, and classifying organisms. b i r o i c Systematics – study of diversity and evolutionary U relationships of organisms through time. M C M Classification – arrangementrof l , aorganisms e B S into groups (taxa) on the n basis of their relationships. e I G 0 2 3study of reconstructing the past Phylogenetics - the systematic 4 3 evolutionary history 2 species or taxa, based on present-day of extant i data, such as omorphologies © or molecular information (sequence data). B  Modern world : enormous diversity of life forms (including microorganisms) y g l o i o o b ~ 30,000 bacterial species r ic MU formally named. There are 1 trillion estimated l M C microbial species. 99.99% of r a S, n them are still undiscovered! e I B e G 023 4 3 2 i o © B The diversity of life © Cold Spring Harbor Lab Why such great diversity? y o g Biological Evolu@on o l Earth’s age now : ̴ 4.6 B years old. b i r o i c Earth? What were the condi@ons of the primi@ve M U l M C Anoxic and reducing environment (more of CH4, CO2, N2, NH3, H2S, FeS). r a S, HoNer (> 100 °C); with frequent volcanic acTvity. n With strong radiaTon. e I B e G 023 4 3 2 i o © B  g y l o i o b o r ic MU l M C r a S, n e I B e G 023 3 2 magazine. 4 © Smithsonian Depiction of the early Earth. i o © B © Pearson Educa