Pseudomonadales

The Pseudomonadales are an order of Proteobacteria. They are gram-negative. Some species can cause diseases, they are pathogen. For example, "Pseudomonas aeruginosa" can cause sepsis. "Azomonas" and "Azotobacter" are able to fix nitrogen.
Systematics.
There are two families: The Moraxellaceae and Pseudomonadaceae. Some examples: