5 Questions
Which type of bacteria are pseudomonads?
Gram-negative rods
What distinguishes pseudomonads from members of the Enterobacteriaceae?
They are strict aerobes
What is the significance of pseudomonads not fermenting glucose?
They are called non-fermenters
What favors the persistence of pseudomonads in the hospital environment?
Being able to grow in water containing only traces of nutrients
What pigments are produced by Pseudomonas aeruginosa?
Pyocyanin and pyoverdin (fluorescein)
Study Notes
Pseudomonads
- Pseudomonads are a type of Gram-negative, aerobic bacteria.
Distinction from Enterobacteriaceae
- Pseudomonads are distinguished from members of the Enterobacteriaceae family by their ability to oxidize carbohydrates rather than ferment them.
Glucose Non-Fermentation
- Pseudomonads do not ferment glucose, which signifies their ability to thrive in environments with limited nutrients.
- This characteristic is significant because it allows pseudomonads to persist in environments where other bacteria may not survive.
Persistence in Hospital Environment
- The persistence of pseudomonads in the hospital environment is favored by the presence of moist environments, such as sinks and humidifiers, and the use of broad-spectrum antibiotics.
Pseudomonas aeruginosa Pigments
- Pseudomonas aeruginosa produces two pigments: pyocyanin (blue-green) and pyoverdin (yellow-green).
- These pigments contribute to the bacterium's ability to colonize and cause infection in the human body.
Learn about the pathogenic species of Pseudomonas in medical microbiology and their characteristics such as being gram-negative rods and strict aerobes. Explore the differences between Pseudomonas and Enterobacteriaceae.
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