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25-Extremophiles - Extremophiles:LifeontheEdge...

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Extremophiles: Life on the Edge D J H ld Dr. James Holden Department of Microbiology
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Summary of bacteria and archaea • They are small (1/1000 th of a millimeter) and unicellular • Most do not cause diseases • They are highly abundant (~ ½ the total biomass on Earth) • They may live mostly inside the crust of the Earth • They are very metabolically versatile • They metabolize a lot of material for their small size
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Extremophiles: lovers of the ‘extreme’ Thermophiles = love of heat Extreme halophiles = love of salt Psychrophiles = love of cold Psychrophiles love of cold Acidophiles = love of acidic environments Alkaliphiles love of basic environments Alkaliphiles = love of basic environments Xerophiles = love of dry environments Barophiles = love of pressure Radioresistant organisms = withstand extreme radiation
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What are hyperthermophiles? 110 ˚ C Based on optimal growth temperatures 80 ˚ C Hyperthermophiles 50 ˚ C Thermophiles 50 C Mesophiles 20 ˚ C Psychrophiles 0 ˚ C Stetter (2006)
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Salterns and evaporative ponds
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