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6 Cards in this Set
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Nitrogen fixation
N2->NH3 |
converts gaseous nitrogen (N2) into ammnonia (NH3. aerobic and anaerobic species carry out conversion.
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Nitrification
Nitrosomonas bacteria and Nitrobacter bacteria |
only nitrifying bacteria can use NH3 as an energy source, then rxn occurs in 2 steps:
1) Nitrosomonas bacteria converts ammonia (NH3) into nitrite (NO2-) 2) Nitrobacter bacteria converts nitrite (NO2-) into nitrate (N03-) |
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Denitrification
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bacteria that can respire anaerobically will convert Nitrate (NO3-) to Nitrite (NO2-)->> electron acceptor, some anaerobic respirers can also use nitrite (NO3-) and also convert further into Gaseous nitrogen(NO)->N2O->N2
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Assimilation
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ammonia can be directly assimilated into organic compounds inside cells producing -NH2
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Excretion
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fermentation, other catabolic processes, -NH2 are released producing ammonia (NH3)
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Assimilatory Nitrate Reduction
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Nitrate (NO3-)is MORE COMMON than Ammonia (NH3), so many organisms can only aquire Nitrogen in the form of Nitrate. The organisms must reduce nitrate to form amino groups for metabolism.
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