Nitrogen assimilation:

The next step in the nitrogen cycle is the assimilation of inorganic nitrogen in the type of ammonia into organic nitrogen-containing compounds. Whole organisms assimilate  ammonia  through two major reactions  catalyzed  through glutamate  dehydrogenase  and glutamine  synthetase  giving increase to the amino acids glutamate (Glu)  and  glutamine  (Gln),  correspondingly.  The amino nitrogen in Glu and the amide nitrogen in Gln are then used in additional biosynthetic reactions to provide increment to other compounds.