Slides_N-Cycle_1

Slides_N-Cycle_1 - Outline – N-Cycle •  Oxidation...

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Unformatted text preview: Outline – N-Cycle •  Oxidation states of nitrogen •  Nitrogen fixation –  Nitrogenase –  Rizobium & Plants •  Ammonia oxidation –  Dead Zones and Red Tides •  Denitrification Oxidation States of Nitrogen NH3 = R-NH2 = AA CMP Oxidation State NH3+ -3 NH2OH -1 N2 0 N2O +1 NO +2 NO2- +3 NO3- +5 Accessible N2 Fixation 90% of N is Biol. Inaccessible! Accessible or Ferrodoxin HCOOH H2 CO2 2H+ Ferrodoxin Pyruvate Nitrogenase Reduced quinones, cytochromes Oxidized quinones cytochromes Acetyl-CoA PSI NAD(P)H NAD(P)+ 19.58 Oxidation States of Nitrogen NH3 = R-NH2 = AA NADH + O2 CMP Oxidation State NH3+ -3 AMO H2O + e- -1 N2 0 N2O +1 NO +2 NO2- e- NH2OH +3 NO3- +5 pmf/NRG e- N2 Fixation 90% of N is Biol. Inaccessible! Gas = “lost” to atmosphere (“Denitrification”) 17.32 17.33 Oxidation States of Nitrogen NH3 = R-NH2 = AA NADH + O2 CMP Oxidation State NH3+ -3 AMO H2O + e- NH2OH -1 N2 0 N2O e- e- +1 eNO pmf/NRG +2 e- NO2e- NO3- +3 e- +5 N2 Fixation 90% of N is Biol. Inaccessible! Gas = “lost” to atmosphere (“Denitrification”) 17.31c ...
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This note was uploaded on 03/06/2012 for the course MIMG 100 taught by Professor Lazazzera during the Summer '10 term at UCLA.

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