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Unit 5
Pseudomonas Fluorescent Group
Question | Answer |
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Which of the following is not a fluorescent Pseudomonas species? Pseudomonas putida, Pseudomonas mendocina, Pseudomonas aeruginosa, or Pseudomonas fluorescens? | Pseudomonas mendocina is not a fluoresecent Pseudomonas. It is non-fluorescent and usually considered a contaminant. |
What test can be used to differentiate Pseudomonas fluorescens from Pseudomonas putida? | The gel test can be used to differentiate the two because Pseudomonas fluorescens is gel positive, while Pseudomonas putida is gel negative. |
Which fluorescent species of Pseudomonas grows at 42 degrees Celsius? | Pseudomonas aeruginosa is the only fluorescent Pseudomonas species that grows at 42C. Both Pseudomonas fluorescens and putida will not. |
What antibiotics are best used to treat Pseudomonas aeruginosa? | Pseudomonas aeruginosa is resistant to most antibiotics except the aminoglycosides. It is also susceptible to Colistin, Polymixin B, Piperacillin, Ticarcillin, Ceftazidime, Cefepime, Imipenem, Meropenem, and Ciprofloxacin. |
What color is the fluorescein or pyoverdin pigment? | This pigment is yellow green. The other three pigments produced by P. aeruginosa are pyocyanin (turquoise blue-green), pyorubin (red), and pyomelanin (black/brown). |