|
Ciliates such as Paramecium have specialized sites for
endocytosis and exocytosis. Most of their surface is not available for
internalization of membrane because of the underlying alveolar sac
system. However to the right of each basal body or pair of basal
bodies is an indentation of the plasma membrane called the parasomal
sac (ps). This penetrates through the septum and ends as a
coated pit. This micrograph also illustrates the normal view of
mitochondria (m) in P. caudatum which are filled with
tubular cristae. In cacodylate-buffered fixations the cytosol contains
abundant electron-opaque glycogen storage granules which seem to be
removed during collidine-buffered fixations (e.g. Figure 11). EM taken
on 5/28/69 by R. Allen with Philips 300 TEM. Neg. 14,800X. Bar =
0.5µm.
|
