ELECTRON MICROSCOPE OBSERVATIONS OF THE TRICHOCYSTS AND CILIA OF PARAMECIUM

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Abstract
Electron micrographs of shadow-cast trichocysts of Paramecium show that the dried trichocyst shaft is flattened on the supporting film, while the pointed tip is apparently more resistant to collapse on dehydration. Accentuation, by the metal, of the previously observed cross striation in the shaft indicates that the periodicity is accompanied by corrugation of the dried surface, the elevations corresponding to the darker bands. A cross striation in the tip is also visible in some micrographs of shadow-cast specimens. In electron micrographs of shadow-cast cilia, the component fibrils (about 11 in number and 300 to 500 A. in width) are seen with increased clarity.

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