PLANTBI 22 Lecture Notes - Lecture 13: Crenarchaeota, Phototaxis, Cell Membrane
23 Oct 2016
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Document Summary
Ecological tness landscape is associated with nutri4on stability. Chicken/egg dilemma: poor diets shape microbiota, while microbes shape nutri4on acquisi4on. Square cells living in sal4est water = pink/purple color. Archaea are o)en associated with extreme environments acidophiles halophiles barophiles radia4on resistant thermococcus gammatolerans: most radia4on resistant organism known iden4 ed in hydrothermal vent o the coast of ca. Archaea are also abundant in mesophilic environments soil oceans one of most abundant groups almost all are unculturable abundant on sea oor & below human and ruminant gut micro ora. Bacteria and archaea have similar morphological features cell wall structures cell membranes : gram positive motility : agella & pili nucleoid : ribosomes; rna polymerase cytoplasm. Branched lipids provide stability at extreme temperatures ether bonds - chemically resistant provide thermostability some archaea; lipid bilayer replaced by monolayer membrane stability at low ph & high temp.
