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...

Like other cells Paramecium has peroxisomes. These organelles are usually smaller than mitochondria and have a granular appearance and contain a few tubular-like inclusions. These tubules have not bee...

The cytoproct is the site of spent vacuole defecation on the surface of Paramecium. When closed the cytoproct forms a long narrow wavy ridge along the posterior suture. At its apex the ridge is about ...

The highest concentration of parasomal sacs is found in the oral region associated with the three ciliary membranelles, called in Paramecium, the ventral amd dorsal peniculi and the quadrulus. This mi...

Toxicysts in the cytoplasm of cross sectioned non-dividing Didinium. Toxicysts (extrusomes) are multilayered cylinders that are discharged from the cytopharynx region during capture of prey such as Pa...

High resolution image of the macronucleus which contains microtubules that lie inside a seemingly intact nuclear envelope. Microtubules orient along the axis of macronuclear elongation in the form of ...

Collecting canal of the contractile vacuole complex. Normally the collecting canal is expanded when the CV is in systole. In this micrograph the collecting canal is empty so that its two sides are fla...

The cytoproct ridge at higher magnification. The unique system of thick fibers extends from each side of the ridge toward the center of the ridge. These thickened fibers are not found in any other par...

In a cell treated with trifluoperizine (TFP), all stages of endocytosis and movement to the early endosomes and out of the early endosomes can be found. These steps begin at the parasomal sac and endi...

Single microtubules extend into the cytoplasm from the tips of the cytoproct ridge. These are thought to come to lie along the surface of the approaching DV-IV and to pull the ridge down against the D...