MBIO 3280 Lecture Notes - Lecture 18: Microaerophile, Phospholipid, Magnetotaxis
25 Oct 2017
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In oxic environments po4-3 binds to iron: more available in anoxic environments, fertilizer application can lead to cyanobacterial blooms (ex. Microcystis, producing microcystin, a liver toxin at sufficient concentration): good example to wash produce you buy from farmers (could have been washed in water with cyanobacteria -> you get sick) Abundance (reservoirs: lithosphere, fourth (cid:373)ost a(cid:271)u(cid:374)da(cid:374)t ele(cid:373)e(cid:374)t i(cid:374) earth"s (cid:272)rust, tiny amounts in water bodies (no free iron, none in atmosphere (or close to none, no ions are volatile enough. Fluxes between reservoirs: very small, microbes liberate iron from rocks (slowly) Aerobes need iron (a lot more than anaerobes: cytochromes, e- transfer carrier. Included in middle of the structure: uptake of iron inside the cell from cytoplasm, active transport uses 1 atp, ferric reducates inside the cell breaks fe2+ from siderophore. Several bacteria precipitate iron as crystals of a mineral called magnetite (fe3o4: crystals are located inside of a membrane called a magnetosome, aligned in a row, ex.
