Let us make an in-depth study of the mechanism of biological nitrogen fixation. The biological nitrogen fixation is carried out by some bacteria, cyanobacteria and symbiotic bacteria. In symbiotic association, the bacterium provides fixed nitrogen (NH3) to the host and derives carbohydrates and other nutrients from the latter. Biological nitrogen fixation occurs in the presence of the enzyme nitrogenase which [...]
The following points highlight the four factors controlling the biological nitrogen fixation. The factors are: 1. Environmental Factor 2. Stage of Plant Growth 3. Fertilizers in the Soil and 4. Genetic Factors. Factor # 1. Environmental Factor: Usually, the factors which favour photosynthesis such as adequate moisture, warm temperatures, bright sunlight and higher CO2 levels, also enhance biological nitrogen fixation. [...]
Biosynthesis of amino acids. The ways are: 1. Ammonium Assimilation 2. Transamination and 3. Other Methods. Way # 1. Ammonium Assimilation: (A) Reductive Ammination: Inorganic nitrogen in the form of NH3 or ammonium (NH4+) produced as a result of reduction of nitrates or biological nitrogen fixation or obtained from the soil, react with a-ketoglutaric acid (an intermediate of Krebs' Cycle) [...]