Pseudomonadota is a major phylum of gram-negative bacteria. They include both pathogenic and free-living genera. The phylum comprises six classes: Acidithiobacillia, Alphaproteobacteria, Betaproteobac

Gram-negative bacteria are bacteria that, unlike gram-positive bacteria, do not retain the crystal violet stain used in the Gram staining method of bacterial differentiation. Their defining characteri