A view of cortical fibers except the observer is looking at a cross-sectioned cell as though from anterior toward the posterior end of the cell; in this view the kd sections are seen on the left side ...

Protozoa, including P. multimicronucleatum, unlike most cells, have tubular cristae in their mitochondria. Tubular cristae, however, do occur occasionally in higher organisms such as in the lutein cel...

When trichocysts are triggered to discharge their contents the body of the trichocyst expands 8 or 9 times into a long needle like filament, however, the trichocyst tip does not change shape. The tric...

The postoral microtubular bundles form a track along which a newly released food vacuole rapidly migrates to the cell’s posterior end. Here the flattened cytopharyngeal membrane lies next to these b...

The finger-like alveolar extension in longitudinal view lies along the dorsal surface of the filamentous reticulum from which the cytopharyngeal microtubular ribbons originate. Whiskers of electron de...

Adapted with permission. Extensions of cytopharyngeal microtubular ribbons that pass into the endoplasm from the cytopharynx. Discoidal vesicles bind to one side only of these ribbons (the anterior si...

A circular depression on the dorsal surface of the cell marks the expulsion site of a contractile vacuole. This is referred to as the contractile vacuole “pore.". Microtubules encircle the pore. Tr...

A high magnification view of the above septum in planar view and the septal pores that connect adjacent alveoli. The pores always lie next to the junction of the septum with the outer alveolar membran...

To see if acidosomes contain hydrolases (digestive enzymes) we incubated cells in Gomori’s medium which in the presence of acid phosphatase and lead will form an electron-opaque reaction product. Ac...

High resolution overview of Coleps hirtus cell seen in this median transverse section. This barrel-shaped cell has a few rows of cilia and the cell is covered with calcified polysaccharide platelets t...