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Mycoplasma pneumoniae and Mycoplasma salivarium: electron microscopy of colony growth in agar
Abstract:
Colonies of Mycoplasma pneumoniae and Mycoplasma salivarium grown in PPLO agar were examined by light and electron microscopy. The main objective of the investigation was to attempt in situ fixation and minimize tonic changes in the organisms. Microscopy revealed that both organisms grew both in and upon the agar. The agar and surface growths of M. pneumoniae exhibited similar profiles, whereas those of M. salivarium differed strikingly. Both organisms are highly pleomorphic, but their matrix was denser and appeared more intact than in previously reported profiles. Cells which resemble the commonly reported mycoplasma were occasionally observed. The significance of these discrepant profiles remains unanswered. It is suggested that they may represent aged or osmotically damaged cells.
Insights
Microscopy of Mycoplasma pneumoniae and Mycoplasma salivarium revealed distinct growth patterns within PPLO agar. Differences in M. salivarium morphology suggest potential aging or osmotic damage in these pleomorphic bacteria.
Area of Science:
- Microbiology
- Cell Biology
Background:
- Mycoplasma pneumoniae and Mycoplasma salivarium are common human pathogens.
- Understanding their morphology and growth is crucial for diagnostics and treatment.
Purpose of the Study:
- To examine the in situ morphology of Mycoplasma pneumoniae and Mycoplasma salivarium.
- To minimize artifactual changes during sample preparation.
Main Methods:
- Light and electron microscopy were used to study colonies grown on PPLO agar.
- In situ fixation techniques were employed to preserve cellular integrity.
Main Results:
- Both Mycoplasma species were observed growing within and on the surface of the agar.
- Mycoplasma pneumoniae showed similar morphology in both locations, unlike Mycoplasma salivarium.
- Organisms presented a denser, more intact matrix than previously described, with occasional typical mycoplasma forms observed.
Conclusions:
- Observed morphological differences in Mycoplasma salivarium may indicate variations due to aging or osmotic stress.
- Further research is needed to elucidate the significance of these discrepant profiles in Mycoplasma species.
