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       #Post#: 323--------------------------------------------------
       nite
       By: bob star5ak Date: February 9, 2011, 10:00 pm
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       Schematic representation of the flow of nitrogen through the
       environment. The importance of bacteria in the cycle is
       immediately recognized as being a key element in the cycle,
       providing different forms of nitrogen compounds assimilable by
       higher organisms.
       The nitrogen cycle is the process by which nitrogen is converted
       between its various chemical forms. This transformation can be
       carried out via both biological and non-biological processes.
       Important processes in the nitrogen cycle include fixation,
       mineralization, nitrification, and denitrification. The majority
       of Earth's atmosphere (approximately 78%) is nitrogen,[1] making
       it the largest pool of nitrogen. However, atmospheric nitrogen
       is unavailable for biological use, leading to a scarcity of
       usable nitrogen in many types of ecosystems. The nitrogen cycle
       is of particular interest to ecologists because nitrogen
       availability can affect the rate of key ecosystem processes,
       including primary production and decomposition. Human activities
       such as fossil fuel combustion, use of artificial nitrogen
       fertilizers, and release of nitrogen in wastewater have
       dramatically altered the global nitrogen cycle
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