Betaproteobacteria are a class that has a gram-negative structure and is involved in nitrogen fixation, which plays an important role in many plants. It supports the formation of nitrite (NO2−), which is an important nitrogen source for plants, through the oxidation of ammonium (NH4+). Creatures belonging to this class mostly live in wastewater or soil. They can be aerobic (containing oxygen) or facultative anaerobic (both containing and not containing oxygen). It contains a wide variety of organisms and has approximately 75 genera and 400 species of bacteria. There are also pathogenic species such as Burkholderia pseudomallei, which causes melioidosis.
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