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chapter+19 - Chapter 19 Archaeal Diversity Archaeal Traits...

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Chapter 19 Archaeal Diversity Archaeal Traits and Diversity Widest temperature range 2°C–121°C Widest range of environments pH 0, high pressure, anaerobic Unique biochemistry Methane production No peptidoglycan Differences in glycolytic pathways Differences in lipids and membranes 4 Phyla of Archaea- (2 major, 2 minor) Phylum 1: Euryarchaeota 4 groups of Euryarchaeota Extreme halophiles Methanogens Thermoplasmatales Hyperthermophiles Phylum Euryarchaeota Extreme halophiles Require at least 9% NaCl for growth – most require 12 – 23% Common in salt lakes and salterns (ponds used to prepare solar salt by evaporation of sea water) Give red color to water Ex. Halobacterium salinarium To prevent water loss in hypertonic environment: pump inorganic ions (K+) into the cell make or concentrate an organic solute in the cell Light-mediated energy production: Some extreme halophiles use light to produce energy
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This note was uploaded on 08/04/2009 for the course BIOL 2051 taught by Professor Brininstool during the Fall '07 term at LSU.

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chapter+19 - Chapter 19 Archaeal Diversity Archaeal Traits...

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