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The Nitrogen Cycle

The Nitrogen Cycle. Vinny Hageman and Kevin Lombardo. Found in animal waste and minerals Present in all living organisms. Nitrogen. Biological Atmospheric nitrogen is converted to ammonia Nitrogenase (enzyme) Cyanobacteria Chemical Haber process Requires high pressures/temperatures

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The Nitrogen Cycle

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  1. The Nitrogen Cycle Vinny Hageman and Kevin Lombardo

  2. Found in animal waste and minerals • Present in all living organisms Nitrogen

  3. Biological • Atmospheric nitrogen is converted to ammonia • Nitrogenase (enzyme) • Cyanobacteria • Chemical • Haber process • Requires high pressures/temperatures • Uses natural gas as a hydrogen source/ air as a nitrogen source Nitrogen Fixation

  4. Nitrogen Cycle

  5. Process of making nitrogen compounds in the air available to plants • Nitrogenase, cyanobacteria • Molecular nitrogen (N2) -> ammonia, nitrates, nitrites (NH4, NH3) Nitrogen Fixation

  6. Conversion of ammonia to nitrates and nitrites • Nitrifying bacteria • Ammonia -> nitrates, nitrites Nitrification

  7. Process during which decomposers convert organic nitrogen of dead plants into inorganic forms • Ex. Earthworms, bacteria, fungi Ammonification (Mineralization)

  8. Process of reduction of nitrate to nitrogen • Microorganisms • Can lead to intermediates • Ex. Nitrous oxide Denitrification

  9. Emissions of NO/NO2 from technical combustion processes • Ex. Car engines • High concentrations can lead to ozone smog • Nitrogen oxides -> nitric acid in atmosphere • Contributes to acid rain • Too much nitrogen-containing fertilizer in the soil • Ammonia and nitrate end up in water bodies and coastal areas and cause plant growth • Plant decomposition can fatally reduce oxygen content in water • Denitrification is enhanced and more nitrous oxide is produced • Increases greenhouse effect Human Intervention

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