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This article suggests a theme for future nitrogen studies, involving the functioning and evolution of the biosphere, together with certain aspects of human biology. It is hoped that this theme could be developed into a multi-authored book at some point in the future, although numerous new case studies may be required.The biosphere can be considered to be a single interactive system, comprised of numerous...
The following article assesses the potential of ammonium as a biomarker in Precambrian metasediments. A modern marine environment is considered to highlight the processes that contribute to the isotopic composition of organic nitrogen, notably the roles played by nitrogen-fixing organisms (cyanobacteria) and denitrifying bacteria. The carbon and nitrogen biogeochemical cycles are compared and contrasted...
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