Journal
BIOCHEMICAL SOCIETY TRANSACTIONS
Volume 39, Issue -, Pages 175-178Publisher
PORTLAND PRESS LTD
DOI: 10.1042/BST0390175
Keywords
ammonium; nitrate; nitric oxide; nitrite; nitrogen cycle; nitrous oxide
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The nitrogen cycle describes the processes through which nitrogen is converted between its various chemical forms. These transformations involve both biological and abiotic redox processes. The principal processes involved in the nitrogen cycle are nitrogen fixation, nitrification, nitrate assimilation, respiratory reduction of nitrate to ammonia, anaerobic ammonia oxidation (anammox) and denitrification. All of these are carried out by micro-organisms, including bacteria, archaea and some specialized fungi. In the present article, we provide a brief introduction to both the biochemical and ecological aspects of these processes and consider how human activity over the last 100 years has changed the historic balance of the global nitrogen cycle.
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