Abstract
This article reviews the mechanism of biological nitrogen fixation, its bacterial transformation 
to nitrate anion, and atmospheric pollution by nitrogen oxides. The history of its synthesis and that of its 
extraction as a mineral, as well as its use as a fertilizer and explosive, are briefly described.

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Copyright (c) 2022 Francisco Lloret Pastor

