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...

The macronucleus, one micronucleus, and the cytoplasm of Conchophthirus. The negative magnification is 6,800X. The raw film was scanned with an Epson Perfection V750 Pro. This image is best used for q...

The deep fiber is associated with the cytopharyngeal membrane (see Smith and Bunse, Trans. Am. Microsc. Soc. 102:264-271, 1983). This membrane has acidosome-like vesicles docked at its cytosolic surfa...

The contractile vacuole, an organelle used by many protists for osmoregulation of water and some ions, such as calcium, is connected to the cell surface in Tetrahymena usually by two “pores," indent...

The contractile vacuole pore is coated on its cytosolic side by helically wound microtubules. Other microtubules abut this helix and extend out to the surface of the contractile vacuole where they are...

During division new basal bodies develop accessory fibers and begin to move apart to take up a position equidistant between the older complexes. The new kinetodesmal fiber seems to be associated with ...

High resolution of a daughter micronucleus in anaphase of a dividing cell of Didinium nasutum. The chromosomes are compacted into one large heterochromatic body. Remnants of the mitotic division spind...

High resolution image of the decorated ER tubules and 'rails' on the surface of the ER next to the myonemal sheet. Dense rods accompany the surface ridges adjacent to the myonemes. Pellicular pores ar...

A high resolution image of the micronucleus and macronucleus of Opercularia coarctata. The nuclear envelope has numerous pores, at least as many per unit length as in the macronucleus. Some areas of t...

A high resolution image of the extensive layer of cortical microtubules which lie under the pellicle and many other microtubules and mitochondria that form a mass in the cytosol. Standard glutaraldehy...