BIOS 2210 Lecture Notes - Lecture 7: Bacteroides, Deep Sea, Gram-Negative Bacteria
14 Sep 2018
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Document Summary
25-70 major phyla in bacteria in air, soil, water, ice, and animal tissue. 2 major phyla in archaea, various physiologies and thermophiles. We don"t know much about archaea because they live in places that are difficult for us to study (ex: edges of volcanoes) Spheres with much peptidoglycan can resist osmotic pressure very well. Spheres with much peptidoglycan can resist osmotic pressure very well: cellular morphology. There are exceptions to the typical shapes/sizes: shape and arrangement. Ancient bacteria that don"t fit the typical mold of bacteria now. Forms of life produces by evolution some 3. 5 billion years ago: archaea. Cell membrane - chemical structure different, bilayer or monolayer. Thrives at 70 degrees c, but can survive at temperatures of 50. Method called pcr can withstand super high temperatures and: deep sea vents still build enzymes. Deep sea thermal vent communities depend on symbiotic bacteria that live in the tubeworms. Bacteria metabolize hydrogen sulfide (rotten egg smell) and feed tube worms.
