Like other ciliates P. multimicronucleatum has two morphologically and functionally different nuclei. Shown here is the tiny micronucleus, of which there are four, during interphase of this cell. This...

The cytosol of Paramecium contains many vesicles of various sizes, shapes and contents as well as complex particles such as ribosomes and glycogen granules. The rough endoplasmic reticulum exists as m...

A high magnification view of the tubulated CV membrane attached to ampullae 2, 3, 4 and 5 of the CVC. The tubules lie against the ribbon of microtubules as well as form a large mat lying inward (centr...

High resolution image of the interphase micronucleus with only a small amount of b-tubulin in its matrix or on its nuclear envelope. Segments of microtubules are scattered in the cytosol. Immunogold l...

The interphase micronucleus has only a small amount of b-tubulin in its matrix or on its nuclear envelope. Segments of microtubules are scattered in the cytosol. Immunogold labeled for anti-b-tubulin....

Cross fracture of cilia of the quadrulus. The basal body/cilium complexes are a little less tightly packed than in the peniculus. There are four or five rows of parasomal sacs interspersed with basal...

Dictyosomal elements of the Golgi complex consist of a layer of coated transition vesicles next to a specialized area of ER called the transition zone and two or three highly fenestrated layers of cis...

Acidosomes originate from the biosynthetic pathway that includes the ER, the Golgi stack and the trans-Golgi network (TGN). Flattened vesicles from the TGN round up into spherical vesicles and bind to...

Nucleoli in a macronucleus of a cell undergoing micronuclear division. The nucleolus appears to have an organized surface layer composed of parallel threads of subunits. These may be developing riboso...

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....