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Azotobacter salinestris is a Gram-negative, nitrogen-fixing bacterium; its specific name, salinestris, comes from the Latin words salinus meaning saline and estris which means "living in". It can be found living in soil or marine habitats as single cells or in chains of six to eight cells. This organism is motile at younger stages, but loses its flagella at older stages. This species is known for its potential use in bioremediation.