Introductory Microbiology

Nitrogen and sulphur requirement

• Nitrogen and sulphur taken up as NO_3- and SO_4-by most organisms and are subsequently reduced within the cell and utilized in other biosynthetic processes. Some microorganisms use N as NH₄₊ salts and some use N and S as organic nutrients in reduced and organic combinations such as amino acids. A few organisms can reduce element N to NH₃ this process of N assimilation is biological nitrogen fixation(BNF).