A particularly large accumulation of peroxisomes each surrounded by a single membrane and containing a few short tubules in an otherwise granular matrix. TEM taken on 8/9/65 by R. Allen with RCA EMU3F...

A cell with a flat alveolar sac system. It is not clear why some cells have expanded alveoli and others have flattened alveoli. Cacodylate buffered fixative. TEM taken on 2/3/69 by R. Allen with Phil...

In quick-freeze deep-etch micrographs it is not easy to distinguish peroxisomes from surrounding organelles. The organelle at the top of this micrograph may be a peroxisome based on its finely granula...

This micrograph shows a crystal surrounded with secondary lysosomes. This was taken from a cell returned to growth medium following starvation for several days (0 day of rejuvenation). This could repr...

Mitochondria are organelles enclosed by two membranes in which the inner membrane invaginates to form tubular cristae. The mitochondria shown here are typical of cells in late log phase of growth. Thi...

A view of the cytopharynx and its nascent food vacuole forming region. The flattened pharyngeal vesicles that may contain monolayers or bilayers of lipids seem to be equivalent to the discoidal vesicl...

A contractile vacuole in systole. The CV has collapsed into vesicles and tubules. Three CV pores can be seen where the CV meets the pellicle. Smooth membrane cisterna surrounds some cytoplasm, possibl...

Detail of CV pore. Microtubules encircle the pore wall and other microtubules radiate out from the pore toward the CV membrane. TEM taken on 3/27/69 by R. Allen with Philips 300 operating at 60kV. Neg...

11 micrographs are views of a serially-sectioned contracted Vorticella convallaria cell that show the main features of this cell. This figure shows 5 food vacuoles; 3 segments of the macronucleus; per...