BIOL240 Lecture Notes - Lecture 7: Mycelium, Micrococcus, Spore
21 Dec 2017
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Document Summary
Many of the most commonly encountered bacteria. 5 groups: alpha beta gamma delta epsilon purple due to pigments used to capture light energy. Photosynethis inhibited by o2. (some are aerobically) Oxidize h2s to s0 during photosynthetic co2 reduction in axonic lakewater. Stored in periplasm or outside cells, disappears when oxidized to sulfate. Bottom to top: sulfate reducers, green bacteria (not a proteobacteria, purple sulfur bacteria (chromatium, purple non sulfur bacteria (rhodomicrobium, cyanobacteria. Methylotrophs: oxidize c1 compounds (no c-c bonds) Methanotrops are methylotrophs capable of oxidizing methane (ch4) to methanol. Found between anoxic (methane is formed) and oxic (needed for respiration) zones. Nitrobacter and nitrospira: nitrite oxidizers and oxidase. Aerobic chemoorganoheterotrophs (polar flagella, used to distinguish from enterics) Free living, n2 fixing bacteria (uses a lot of atp) Nitrogenase (n2 to nh3) is irreversibly inactivated by o2. Members of the alphaproteobacteria gram negative aerobic rods. Agrobacterium crown gall disease, causes tumors in plants. Rhizobium, sinorhizobium, azorhizobium, mesorhizobium, bradyrhizobium symbiotic nitrogen fixers.
