BIOL240 Lecture Notes - Lecture 1: Alphaproteobacteria, Nitrobacter, Purple Sulfur Bacteria
Document Summary
Proteobacteria: many of the most commonly encountered bacteria, related to mitochondria, metabolically diverse. Phototrophs: morphologically diverse, five phylogenetic groups: Alpha beta, gamma, delta, epsilon ( , , , , ) Anoxygenic photosynthesis: photosynthesis inhibited by o2, wavelengths determined by specific bacteriochlorophylls and carotenoids. Purple sulfur bacteria blooms: photoautotrophs of the gammaproteobacteria. Oxidize h2s to s0 during photosynthetic co2 reduction in anoxic. Stored in periplasm or outside cells, disappears when oxidized to lakewater sulphate. Recall waterbottle + fire explosion in bio lecture. Recall he walked around with this in bio lec: photoautotrophs of the gammaproteobacteria. High sulfur preferred by chromatium (purple sulfur bacteria) Low sulfur preferred by rhodomicrobium (purple non- sulfur bacteria) H2s source due to anaerobic respiration with. Methylotrophs oxidize c1 compounds: no c-c bonds (non-organic) Methanotroph environments oxic (needed for respiration) zones. Example: lake: found in cattle rumen, swamps. Although high ch4, o2 is often too low. Use reduced n compounds as energy sources (e- donors)
