Archive | Nitrogen Cycle

All molecules of biological importance, except water, carbohydrates and fats, contain nitrogen. Proteins, amino acids, chlorophyll etc. all contain nitrogen. Of total body dry weight, nitrogen makes up almost 13%, which is the third-most abundant element after carbon (48%) and oxygen (24%). The atmosphere contains approximately 78 per-cent nitrogen, mostly in gaseous form (N2), and thus forms the greatest reservoir [...]