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Intracytoplasmic membrane structures in Vibrio marinus.

R A Felter, S F Kennedy, R R Colwell

    Journal of Bacteriology
    |May 1, 1970
    PubMed
    Summary
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    Electron microscopy revealed unique intracellular membrane structures in Vibrio marinus psychrophilic bacteria. These complex membrane formations, termed "myelemma," varied with culture age and strain, offering insights into bacterial cell biology.

    Area of Science:

    • Microbiology
    • Cell Biology
    • Electron Microscopy

    Background:

    • Vibrio marinus are marine bacteria adapted to cold environments.
    • Understanding bacterial intracellular structures is crucial for cell biology.
    • Psychrophilic bacteria exhibit unique adaptations to low temperatures.

    Purpose of the Study:

    • To investigate and characterize intracellular membranous structures in Vibrio marinus strains MP-1 and PS-207 using electron microscopy.
    • To correlate the occurrence and complexity of these structures with bacterial growth phase and strain type.

    Main Methods:

    • Transmission electron microscopy was employed to examine Vibrio marinus strains MP-1 (obligate psychrophile) and PS-207 (moderate psychrophile).
    • Cellular structures were analyzed across different growth phases (early logarithmic, late logarithmic, and stationary).

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    Main Results:

    • Numerous intracellular membranous structures were observed in both strains, with higher frequency in MP-1.
    • Early logarithmic phase cells showed plasma membrane invaginations.
    • Late logarithmic and stationary phase cells exhibited complex membrane forms, including myelin-like sheaths (proposed term: myelemma) and randomly arranged membranes, not directly connected to the plasma membrane but often associated with vacuoles.

    Conclusions:

    • Vibrio marinus possesses complex intracellular membrane systems, particularly in older cultures.
    • The proposed term 'myelemma' describes novel myelin-like structures found in these bacteria.
    • These findings contribute to understanding the structural diversity and adaptation of psychrophilic bacteria.