BIOL240 Lecture Notes - Lecture 10: Great Salt Lake, Soda Lake, Halobacterium
13 Mar 2017
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Document Summary
Characteristics: only recently have been recognized as a group of organisms. Tend to inhibit extreme environments (ie. high temps, acidic, alkaline, high [salt]: many of these organisms actually require these extreme conditions to grow and reproduce, pathogenic examples of these organisms do not seem to exist. Phylogenic overview (3 we will look at): halophilic aracheae, methanogens, thermoplasmateles, from aracheae this divides into euryarchaeota, crenarchaeota, korarchaeota. Examples of the genera: halobacterium: morphology = rods, # of species = 1, dna = 66- Intra- and extracellular concentrations of ions: high na+ outside the and low k+ outside, low na+ inside, and high k+ inside the cell. Methanogens: physiology s dependent on the methane produced by the methanogens metabolism, obligate anaerobes, and are phylogenetically diverse. Unlike the mycoplasmas, thermoplasmatales do not have sterols to stabilize their membranes. Overview: crenachaeota sulfur, thermophiles, grow in acidic ph, euryarchaeota methanogens, hyperthermophiles, no cell walled organisms, halophiles, marine euryarcheaota/crenarchaeota.
