Monera Halophiles Halophiles are phototrophs (producing their energy from light) that use a purple version of chlorophyll called bacteriorhodosin. They live in extremely salty conditions such as those found in the Great Salt Lake and the Dead Sea. Such environments present two challenges. First, the difference in salt concentration inside and outside the cell is tremendous, creating huge osmotic pressure. While other organisms would rapidly lose all of their water and die, halophiles have adapted to survive within such a difference in water gradient. Second, the salty environments are very alkaline, some having a pH of up to 11.5. Beyond simply surviving within these inhospitable environments, halophiles have incorporated the conditions into their unique photosynthetic pathway. Most halophiles are aerobes. Sulfur Reducers Like methanogens, sulfur reducers live near volcanic vents and pools. As their name suggests, they use the abundant inorganic sulfur found near these vents, along with hydrogen, as food.
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This note was uploaded on 01/27/2012 for the course BIOLOGY BSC1005 taught by Professor Rodriguez during the Winter '09 term at Broward College.