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Electron microscopic observations of amoeba proteus in growth and inanition
Abstract:
Electron microscopic observations have been made on growing and dividing specimens of Amoeba proteus and also on starving animals. Structures presumably corresponding to the mitochondria, alpha particles, vacuoles, and Golgi material are described. A new entity, designated as a foamy particle, is noted. Descriptions are given of the cytoplasmic and nuclear membranes. During division the inner, thick nuclear membrane component is seen to vanish and the outer membrane persist. Measurements suggest a gradual reappearance of the inner component with growth. Starving animals show a loss of cytoplasmic granularity and an increase in the electron density of mitochondria, presumably due to lipide accumulation.
Insights
Electron microscopy reveals new foamy particles in Amoeba proteus. Nuclear membrane dynamics during cell division and starvation effects on mitochondria are detailed.
Area of Science:
- Cell Biology
- Microscopy
- Protozoology
Background:
- Amoeba proteus serves as a model organism for studying cellular processes.
- Understanding organelle structure and dynamics is crucial for cell biology.
Purpose of the Study:
- To describe the ultrastructure of Amoeba proteus during growth, division, and starvation using electron microscopy.
- To identify and characterize novel cellular components and membrane behaviors.
Main Methods:
- Transmission electron microscopy was employed to examine ultrathin sections of Amoeba proteus.
- Specimens were observed during active growth, cell division, and periods of starvation.
Main Results:
- Detailed descriptions of mitochondria, alpha particles, vacuoles, and Golgi material were provided.
- A previously undescribed structure, termed a 'foamy particle,' was identified.
- Dynamic changes in the nuclear membrane during cell division were observed, with the inner component vanishing and reappearing.
- Starvation led to decreased cytoplasmic granularity and increased mitochondrial electron density, indicative of lipid accumulation.
Conclusions:
- Electron microscopy provides valuable insights into the ultrastructure and dynamic changes within Amoeba proteus.
- The identification of foamy particles and the characterization of nuclear membrane behavior during division represent significant findings.
- Cellular responses to starvation, including mitochondrial alterations, highlight adaptive mechanisms in Amoeba proteus.
