Nitrogen Fixation

In the nitrification process, Nitrosomonas converts ammonia to nitrite , and Nitrobacter then converts nitrite to nitrate . This is a sequential oxidation process essential in the nitrogen cycle.

Beijerinckia is an aerobic nitrogen-fixing bacterium, while Rhodospirillum is anaerobic and photosynthetic. They represent typical examples of free-living nitrogen-fixers adapted to different oxygen conditions.