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Related Experiment Videos

Assays for testing Pneumocystis carinii viability.

E S Kaneshiro1, Y P Wu, M T Cushion

  • 1Department of Biological Sciences, University of Cincinnati, OH 45221-0006.

The Journal of Protozoology
|November 1, 1991
PubMed
Summary

Researchers evaluated vital stains for P. carinii viability. A combination of calcein AM with ethidium homodimer or propidium iodide effectively distinguished live, dead, and moribund P. carinii cells.

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Area of Science:

  • Microbiology
  • Cell Biology
  • Biotechnology

Background:

  • Pneumocystis carinii (P. carinii) is an opportunistic pathogen.
  • Accurate viability assays are crucial for studying P. carinii.
  • Traditional staining methods may lack specificity or sensitivity.

Purpose of the Study:

  • To evaluate vital stains and fluorescent indicators for P. carinii viability.
  • To identify a reliable method for distinguishing live, dead, and moribund P. carinii.

Main Methods:

  • Evaluation of classical vital stains.
  • Assessment of fluorescent indicator compounds.
  • Utilizing the acetoxymethyl ester of calcein in combination with ethidium homodimer or propidium iodide.

Main Results:

  • The combination of calcein AM and ethidium homodimer/propidium iodide effectively differentiated P. carinii viability.
  • High fluorescence intensity was achieved with the tested combination.
  • Low photobleaching allowed for high-magnification photodocumentation.

Conclusions:

  • Calcein AM combined with ethidium homodimer or propidium iodide is a robust viability assay for P. carinii.
  • This method enables precise discrimination of organism states.
  • The assay supports detailed microscopic analysis and documentation.

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