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The cytosol of Paramecium contains many vesicles of various
sizes, shapes and contents as well as complex particles such as
ribosomes and glycogen granules (arrowheads). The rough
endoplasmic reticulum (er) exists as membrane cisternae and
tubules which bear ribosomes (rib) on their cytosolic surface.
Mitochondria (m) and peroxisomes (per) both have tubular
membrane inclusions. Large vesicles with an electron transparent
center are acidosomes (ac). Lysosomes (ly) have a
heterogeneous content but always have a heavy polysaccharide lining on
their luminal membrane face. Flattened vesicles, called discoidal
vesicles (disc), form a pool of membrane from which phagosome
membrane is derived. EM taken on 10/30/68 by R. Allen with Philips 300
TEM. Neg. 20,500X. Bar = 0.5µm.
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