Lecture 6 spring 09

Lecture 6 spring 09 - Microbial metabolic diversity and...

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Click to edit Master subtitle style Microbial metabolic diversity and global
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Microbes balance and maintain Earth’s environment Microbial ecology
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Everywhere and abundant 1030 prokaryotes on earth Are we more microbe than
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Microbes are able to squeeze every bit of energy from a chemical compound With a little help from their friends Community members scavenge reaction products which shifts the reaction equilibrium and makes it favorable i.e., butyrate-degrading bacteria when co-cultured with a methanogen can grow with a reaction that yields only -4.5 kilojoules per mole of free energy, takes 33 kilojoules per mole to convert ADP to ATP
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Earth’s garbage disposals Degrade plants and
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Biogeochemical Major bioelements
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Carbon cycle methane Anaerobic sediments
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There are no naturally occurring organic compounds that cannot be Some are slow to break down, like lignin-rich humus
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Human impact on the carbon cycle Facts: • the concentration of carbon dioxide in Earth’s atmosphere is increasing
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Methanogenic archaea are crucial Degradable organic compounds trapped in anaerobic environments, sediments of oceans and lakes
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CH 4 + SO 4 > CO 2 + H 2 S + 2OH- Archaeal ANME-1 rods visualized with the ANME1-862 probe labeled with fluorescein (in green), and Desulfosarcina spp. stained with the DSS_658 probe labeled with Cy-3 (in red).
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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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Lecture 6 spring 09 - Microbial metabolic diversity and...

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