, Volume 130, Issue 1, pp 41–50 | Cite as

Ultrastructural aspects of a glycerinated model ofAmoeba proteus

  • S. Sonobe
  • K. Kuroda


Two types of filamentous structures were observed by electron microscopy in both non-glycerinated cell and glycerinated model ofAmoeba proteus. One was a thin filament 6–8 nm in diameter and the other was a thick rod-shaped filament 30 nm in diameter and 0.6 μm long. Upon addition of Mg-ATP at all Ca2+ concentration examined, these filaments in the glycerinated model aggregated around the nucleus, forming thick filament clusters from which thin filaments radiated. After that, at 10−8 M Ca2+, the filament layer containing thick and thin filaments separated from the plasma membrane, surrounded the granular cytoplasm and contracted centripetally. At 10−6 M Ca2+, a thin filament meshwork containing thick filaments was seen in the area where streaming occurred. At 10−4 M Ca2+, the filament aggregates formed by the initial contraction around the nucleus disappeared, and few thin filaments were observed in the cytoplasm 10 minutes after the reactivation.


Amoeba Filament system Glycerinated model Ultrastructures 


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Copyright information

© Springer-Verlag 1986

Authors and Affiliations

  • S. Sonobe
    • 1
  • K. Kuroda
    • 1
  1. 1.Department of Biology, Faculty of ScienceOsaka UniversityOsakaJapan

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