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*CIL – Cell Image Library accession number. Please use this to reference an image.

CIL:36706*  Cite 

The cytopharynx in cross section showing the cytopharyngeal microtubular ribbons lying in the plane of the section. Some discoidal vesicles, some containing HRP label, are also seen in planar view. Acidosomes also accumulate near the growing nascent digestive vacuole. The lower ribbon has 10 microtubules showing while, what are probably two ribbons lying side by side, show 22 microtubules in the upper ribbon. A normal sized discoidal vesicle lying flat against a ribbon will overlap with at least 6 microtubules. A strong association of a tubular vesicle with several microtubules probably spreads the tubule into the very regular discoidal shape. The arrow points to the sharp bend in the accessory microtubules coming from the edge of the quadrulus where they contact the filamentous reticulum. TEM taken on 4/18/79 by R. Allen with Hitachi HU11A operating at 75kV. Neg. 14,750X. Bar = 0.25µm.

Technical Details

Standard glutaraldehyde fixation followed by osmium tetroxide, dehydrated in alcohol and embedded in an epoxy resin. Microtome sections prepared at approximately 75nm thickness. The negative was printed to paper and the image was scanned to Photoshop. This digitized image is available for qualitative analysis. Additional information available at (

Biological Sources
NCBI Organism Classification
Paramecium multimicronucleatum
Cell Type
cell by organism
eukaryotic cell
Eukaryotic Protist
Ciliated Protist
Cellular Component
oral apparatus
microtubule associated complex
Biological Context
Biological Process
oral apparatus organization
Richard Allen (University of Hawaii)
Digital Object Identifier (DOI)
Archival Resource Key (ARK)
Image Type
transmission electron microscopy (TEM)
illumination by electrons
Image Mode
detection of electrons
Parameters Imaged
electron density
Source of Contrast
stain with broad specificity
Visualization Methods
stain with broad specificity
osmium tetroxide
uranyl salt
lead salt
Processing History
recorded image
Print from negative scanned for Photoshop.
Data Qualifiers
processed data
Spatial Axis Image Size Pixel Size
X 3100px ——
Y 3616px ——