MICR 221 Lecture Notes - Lecture 21: Great Salt Lake, Lake Vostok, Osmoprotectant
24 Apr 2018
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P tolerant microbes, ex mariana trench ph1-5, found in mine tailings, sulfur pools + human stomach. >1. 5m, uv and dessication resistant + survive w/o o, found in great salt lake and. Survive at high temps, hot springs + geysers, hydrothermal vents + black smokers, mines+ factories, diff planets, some are hyperthermophilic archaea. Lithotropic: bacteria use h2s, h2, nh4, co2 from vent. Uses: study life elsewhere, molecular evolution, bioremediation- breakdown pollution, industrial micrbio- rxs at higher temps=faster. Thermophiles aquaticus: survive at 70c in yellowstone park, used as taq pol in pcr. Lake vostok psychrophiles grow at 0c but killed at subzero temps. Use= sewage treatment to make snow, sewage bulbs. Survival mechanisms: mod of lipids in memb, prod of special proteins like chaperons, pigments, antifreeze proteins (afp)- lower freezi(cid:374)g poi(cid:374)t (cid:271)ut inps do(cid:374)"t allows soln to supercool, osmoprotectants to prevent dessication and to lower freezing point, biofilms. Ice nucleators: p. syringae + borealis, prevent sig supercooling.
