For example, some cyanobacteria have structures called heterocysts that provide a low-oxygen environment for the enzyme and serves as the site where all the nitrogen fixation occurs in these ...

Another example is the symbiosis between actinorhizal ... above play an important role in the worldwide ecology of nitrogen fixation, by far the most important nitrogen-fixing symbiotic ...

Living organisms need nitrogen as a central building block for protein formation, for example. However ... Earth was therefore dependent on nitrogen fixation by microbes. In other words, on ...