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CIL:36258*  Cite 

Freeze fracture of the plasma membrane and outer alveolar membrane of the pellicle of V. microstoma. The surface of Vorticella is encircled by rings which follow the septa of underlying alveoli. In this fracture one can see the fractured necks of the continuities between the outer and inner alveolar membranes (latter not visible). The outer alveolar membrane has many prominent IMPs on its P-fracture face. Septal pores extend between the continuities, thus the alveoli are all interconnected. The E-fracture face of the plasma membrane has only a moderate number of prominent IMPs compared to its P face. TEM taken on 11/11/75 by R. Allen with JEM 100B operating at 80kV. Neg. 14,579X. Bar = 0.25µm. A print of the negative was scanned and processed in Photoshop. This image is best used for qualitative analysis. There is a high resolution version of this image in the library (CIL:39325) which is available for quantitative analysis. Additional information available at (

Biological Sources
NCBI Organism Classification
Vorticella microstoma
Cell Type
cell by organism
eukaryotic cell
Eukaryotic Protist
Ciliated Protist
Cellular Component
plasma membrane
cell cortex
cell cortex part
Biological Context
Biological Process
plasma membrane organization
Richard Allen (University of Hawaii)
Digital Object Identifier (DOI)
Archival Resource Key (ARK)
Grouping This image is part of a group.
Image Type
transmission electron microscopy (TEM)
illumination by electrons
Image Mode
electron density
Parameters Imaged
elastic scattering of electrons
electron density
Source of Contrast
differences in deposition of metal shadow
Visualization Methods
transmission electron microscopy (TEM)
Processing History
shadowing and plating
recorded image
Print of negative scanned for Photoshop
Data Qualifiers
processed data
Spatial Axis Image Size Pixel Size
X 2896px ——
Y 3688px ——