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Tetrahymena pyriformis (= thermophila), strain W
(obtained from Dr. I.R. Gibbons, Harvard) in cross section.
Tetrahymena is a ciliated protozoan used in a wide variety of
studies on eukaryotic cells in part because of its ease of culture and
short life cycle. As in all ciliates it is bordered by a plasma
membrane (pm) and a mosaic of underlying alveoli (al).
This section has 17 longitudinal surface corrugations from which cilia
(c) extend. A longitudinal row of cilia is called a kinety. The
cytoplasm is filled with structural elements including ribosomes,
mitochondria (m) and lipid bodies (lip) as well as the
membranes of the endoplasmic reticulum (er) and endosome system
(ee). EM taken on 8/11/65 by R. Allen with RCA EMU3F TEM. Neg.
5,500X. Bar = 1µm. Published in J. Protozool. 14:553-565, 1967.
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