lecture2 spring 09- microbe taxonomy

lecture2 spring 09- microbe taxonomy - Origins and Taxonomy...

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Origins and Taxonomy of n They’re everywhere
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Early Earth Earth is ~4.5 billion years old Chemistry Early Earth was Anoxic (no Oxygen gas) CH4, CO2, N2, NH4+, H2S, FeS, CO and H2 Temperature initially >100°C, then cooled With radiation (energy), biomolecules formed and polymerized
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Timeline of Earth cyanobacter ia oxygen arises Energy sources? Photosynthesis became predominant because it was a more efficient mode of energy generation; more biomass, development of food web. Microbes dominate the planet for 2-3 billion years.
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RNA world hypothesis Lipid vesicles in montmorillonite clay This clay is a product of the erosion of volcanic ash. Will absorb water and also encourages lipids to form vesicles. Under the right conditions it wil
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RNA world RNA can store information Can catalyze reactions like enzymes duplicate self or other molecules form peptide bonds The RNA world evolved into the DNA protein world of today with DNA taking over the function of data storage and proteins with flexible amino acid composition became specialized catalytic moleculoes. QuickTime™ and a  decompressor are needed to see this picture.
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Evolved into many shapes and sizes Azotobacter Staphylococcus aureus
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Borrelia burgdorferi (cause of Lyme’s disease) Treponema pallidum (cause of Syphilis)
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Bacillus anthracis -- first microbe grown in pure culture by Robert Koch, 1877 This media comes from the Centers for Disease Control and Prevention's Public Health Image Library (PHIL), with identification number #1792 .
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Myxobacteria-- the social microbe Myxococcus xanthus Image from GBF
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Prokaryotes are ot always small Epulopiscium fishelsoni ~0.24 mm. Original article: Mendell, J.E., Clements, K.D., Choat, J.H., Angert, E.R. (2008). Extreme polyploidy in a large bacterium. Proceedings of the National Academy of Sciences USA, 105 (18), 6730-6734. DOI: 10.1073/pnas.0707522105 Epulopiscium fishelsoni
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This note was uploaded on 04/07/2009 for the course MICROBIO 303 taught by Professor Kaspar/escalnte/downs during the Spring '09 term at Wisconsin.

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lecture2 spring 09- microbe taxonomy - Origins and Taxonomy...

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