Wednesday, September 30, 2009

Wednesday, September 30, 2009 - Wednesday, September 30,...

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Announcements: Problem Set 1 I. Continue bacterial nutrition and energy metabolism II. Two compartments A. Cellular organization III. Overview A. Synthesis and assembly IV. C, N, and S are involved in both nutrition and energy metabolism a. Look at Nitrogen and Sulfur b. Bacterial nutrition and energy metabolism : 1. Biosynthesis Energy metabolism (takes place in the energy demand of the cell = much greater in term of energy metabolism than in term of biosynthesis) NH4+ > NO3-/NO2- NO3-/NO2- > urea (NH2-CO-NH2) Ureas > R-NH2 R-NH2 > N2 (dinitrogen = most stable nitrogen source in the least prefer = the most abundant because it takes a lot of energy to convert ditrogen into NH3) Nitrogen - assimilated as NH4+ - Electron donor Electron acceptor NH4 and NO2- (nitrification) - ==> Lithotroph NO3- and NO2- => NH4- (nitrate respiration => N2) - (denitrification) ==> organotroph SO4 and S 0 SO4 is dominant Sulfur component in the environment SO4 ===> H2S Sulfur - assimilated as H2S = which is very
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Wednesday, September 30, 2009 - Wednesday, September 30,...

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