class24_w08

class24_w08 - Nitrogen Fixation(diazotrophy Nitrification...

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Acid mine drainage FeS 2 + 7/2 O 2 + H 2 O Fe 2+ + 2 HSO 4 - Sulfur oxidation under aerobic conditions by thiobacillus ferrooxidans , from disulfide S 2 2- [FeS 2 is pyrite, found in underground coal seams] Next reactions: 4 Fe 2+ + O 2 + 2 H 2 O 4 Fe 3+ + 4 OH - (general to Fe 2+ -laden groundwater) 3+ 2 3 +
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4 reactions constitute the nitrogen cycle:
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Unformatted text preview: Nitrogen Fixation (diazotrophy) Nitrification Nitrate Assimilation Denitrification All are catalyzed by enzymes in microorganisms Favorable free energy changes are exploited for growth and metabolism of the microorganism-3-1 +3 +5 +3 +3 +2 +1...
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class24_w08 - Nitrogen Fixation(diazotrophy Nitrification...

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