Pseudomonas

Definition

Pseudomonas is a genus of Gram-negative, rod-shaped bacteria known for their metabolic diversity and ability to thrive in various environments. They are often opportunistic pathogens, particularly Pseudomonas aeruginosa, which can cause infections in humans.

5 Must Know Facts For Your Next Test

1. Pseudomonas species are commonly found in soil, water, and on plant surfaces.
2. Pseudomonas aeruginosa is a major cause of hospital-acquired infections and is particularly dangerous for immunocompromised individuals.
3. This bacterium is known for its resistance to many antibiotics due to its robust efflux pumps and biofilm formation.
4. Pseudomonas can perform denitrification, playing a significant role in the nitrogen cycle by converting nitrate to nitrogen gas.
5. They possess versatile metabolic pathways allowing them to degrade a wide range of organic compounds, making them useful in bioremediation.

Review Questions

• What environments are Pseudomonas species commonly found in?
• Why is Pseudomonas aeruginosa particularly concerning in healthcare settings?
• How do Pseudomonas species contribute to the nitrogen cycle?

Related terms

Proteobacteria:

A major phylum of Gram-negative bacteria that includes a wide variety of pathogens.

Biofilm:

A structured community of microbial cells surrounded by a self-produced polymeric matrix and adherent to an inert or living surface.

Denitrification:

The microbial process of reducing nitrate and nitrite to gaseous forms of nitrogen such as N2 or N2O.