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Membranous inclusions of Pseudomonas aeruginosa
Abstract:
Electron microscopy of sectioned cells of Pseudomonas aeruginosa treated with a double fixative in N-2-hydroxyethylpiperazine-N-2-ethanesulfonic acid revealed a number of membranous inclusions varying in size and morphology. One round, electron transparent form was frequently observed which did not routinely appear to be attached to the cytoplasmic membrane and varied in size from 120 to 300 nm in diameter. However, in one case, several tubular structures between an inclusion and the cytoplasmic membrane was observed. On rare occasions, a large and unusual multilayered inclusion consisting of three thick and distinct layers was also encountered. In addition, two small mesosomal structures were singly observed in cells and were situated proximal to the cytoplasmic membrane. One type appeared to consist of a single thin membrane, whereas the other type consisted of a delicate, multilayered structure.
Insights
Electron microscopy revealed novel membranous inclusions in Pseudomonas aeruginosa. These structures, including round and multilayered forms, offer new insights into bacterial cell biology and ultrastructure.
Area of Science:
- Microbiology
- Cell Biology
- Microscopy
Background:
- Pseudomonas aeruginosa is an opportunistic pathogen known for its complex cellular structures.
- Understanding bacterial ultrastructure is crucial for developing targeted antimicrobial strategies.
Purpose of the Study:
- To investigate the morphology and characteristics of membranous inclusions in Pseudomonas aeruginosa.
- To document previously unobserved or rare intracellular structures within the bacterium.
Main Methods:
- Transmission electron microscopy was employed to examine sectioned Pseudomonas aeruginosa cells.
- Cells were treated with a double fixative solution based on N-2-hydroxyethylpiperazine-N-2-ethanesulfonic acid (HEPES).
Main Results:
- Multiple membranous inclusions of varying size and morphology were identified.
- A common finding was a round, electron-transparent inclusion (120-300 nm) not typically attached to the cytoplasmic membrane.
- Rare observations included tubular structures linking inclusions to the membrane and a large, multilayered inclusion.
Conclusions:
- The study identified diverse and previously undescribed membranous inclusions in Pseudomonas aeruginosa.
- These findings contribute to a deeper understanding of the bacterium's internal organization and potential functional roles of these structures.