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The Nitrogen Cycle!!!!

The Nitrogen Cycle!!!!. Lauren Gokey, Kat Chew, Connie Suh, Katie Husa APES, Period 5. General Information.

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The Nitrogen Cycle!!!!

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  1. The Nitrogen Cycle!!!! Lauren Gokey, Kat Chew, Connie Suh, Katie Husa APES, Period 5

  2. General Information • Purpose: The air is the major reservoir of nitrogen but organisms cannot use nitrogen in this form. The nitrogen must be in a “fixed” into organic compounds that can be taken up by the organisms.

  3. Nitrogen Fixation • Process where atmospheric nitrogen is converted to ammonia, then ammonium, which is the form organisms can utilize. • . Certain bacteria (e.g. Rhizobium) fix nitrogen through metabolic processes • Atmospheric, Industrial, & Biological Fixation

  4. Nitrification • Ammonium produced by decomposition converted to nitrate. • Bacteria gain energy & it requires O2. • Ammonium ions are positively charged; therefore, stick to negatively charged clay particles and soil organic matter.

  5. Denitrification • Oxidized forms of nitrogen (e.g. nitrate & nitrite (NO2-) are converted to N2 and, to a lesser extent, nitrous oxide gas. • Anaerobic process carried out by denitrifying bacteria • NO3- NO2- NO N2O N2.

  6. Ammonification • the conversion of organic nitrogen to ammonium (NH4+) by the action of decomposers (bacteria).

  7. Assimilation • Conversion of nitrate to nitrite • reduction to ammonia • ammonia is incorporated into glutamine and is reductively transferred to 2-oxoglutarate to form glutamate

  8. Works Cited • “The Nitrogen Cycle”. http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/N/NitrogenCycle.html (9/19/08) • “The Nitrogen Cycle: Of Microbes and Men”. http://www.visionlearning.com/library/module_viewer.php?mid=98 (9/19/08) • “The Nitrogen Cycle”. http://www.physicalgeography.net/fundamentals/9s.html (9/19/08) • “The Nitrogen Cycle”. http://www.reefscapes.net/articles/articles/2002/nitrogencycle.html (9/19/08) • “Nitrogen Cycle”. http://www.elmhurst.edu/~chm/onlcourse/chm110/outlines/nitrogencycle.html (9/19/08)

  9. http://www.uwsp.edu/geo/faculty/ritter/geog101/textbook/earth_system/nitrogen_cycle_EPA.jpg. September 22, 2008. Nitrogen cycle. http://www.enviroliteracy.org/images/page-spec/nitrogen_cycle.gif. September 22, 2008 http://www.drsfostersmith.com/images/articles/a_654_AquaNitrogenCycle.jpg. September 22, 2008. Ammonia in the Nitrogen Cycle http://earth.rice.edu/MTPE/bio/biosphere/topics/energy/nitrogen_cycle.gif. September 22, 2008. The flow of nitrogen through the environment http://kentsimmons.uwinnipeg.ca/16cm05/1116/27T-03a-Rhizobium.jpg. September 22, 2008. The Diversity of Life. http://www.mantelsaat.com/images/rhizobium.jpg. September 22, 2008. http://www.nature.com/nature/journal/v447/n7146/images/447781a-i1.0.jpg. September 22, 2008. http://www.augsburg.edu/biology/photoofmonth/nodule-sectionclosewcaption.jpg. September 22, 2008. Nitrogen Fixing Root Nodules. http://www.organicgrowingsystems.com/images/gar3.jpg. September 22, 2008/ http://www.noaanews.noaa.gov/stories2007/images/lightning_midsize.jpg. September 22, 2008. NOAA, NASA Contractor for Satellite based lightning detection instrument. http://www.itsaulplants.com/_ccLib/image/random/DETA-10.jpg. September 22, 2008

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