How are organisms like Pseudomonas and Thiobacillus of great significance in nitrogen cycle?
In biological nitrogen fixation, the atmospheric N2 gets reduced to NH3 by nitrogenase reductase present in some prokaryotes. NH3 is then oxidises to NO2 and NO3 by some other bacteria (Nitrosomonas and Nitrobacter). Various steps involved in nitrogenfixation are as follows
Pseudomonas and Thiobacillus are involved in the process of denitrification. They convert nitrate (NO3-) and nitrite (NO2- ) into free nitrogen (N2), which is released into the atmosphere.
