The Cytoproct of Paramecium Caudatum: Structure and Function, Microtubules, and Fate of Food Vacuole Membranes

摘要: The cytoproct or cell anus of Paramecium caudatum was studied, using light optics and electron microscopy, at known times before, during following food vacuole egestion. This accomplished by microscopically observing single cells, fixing these cells specific finally serial sectioning individually processed cells. cytoproct, rest, is a long narrow ridge along the posterior suture. It contains 2 uniquely positioned components which identify this structure as cytoproct: piles fibres inside surfaces ridge, microtubules passing from epiplasm summit down into cytoplasm. plasma membrane continuous over top ridge. cortical basal bodies adjacent to have bundles cytoplasm an opaque plaque their proximal ends. These sets may function in guiding vacuoles cytoproct. A model presented motive forces generated between bring and, addition, pull lips apart so that come contact fuse together, thus opening outside. increases area parting lips, possibly, result intercalation vesicles Immediately after formed changes smooth topography highly convoluted one. engulfed through process endocytosis resulting accumulation membranous fragments below endocytic probably about restitution pulling back together engulfed. filamentous meshwork underlying be active process.