Alternate header for print version

Public Domain: This image is in the public domain and thus free of any copyright restrictions. However, as is the norm in scientific publishing and as a matter of courtesy, any user should credit the content provider for any public or private use of this image whenever possible. Learn more
*CIL – Cell Image Library accession number. Please use this to reference an image.

CIL:36288*  Cite 

This freeze fracture view of the pellicle of V. microstoma near the aboral end of the zooid shows the region where the width of each circumferential alveolus is narrower and thus the strings of fractured pits are closer together. In this case the E-fracture face of the outer alveolar membrane is shown which has fewer IMPs than the P-face of the outer alveolar membrane as seen in the previous figure. Here the connections are indentations rather than fractured necks. In a few areas the P-fracture face of the plasma membrane is viewed where it was pinched into the folds between rings that surround the cell. The plasma membrane, like a similar view in figure 23, demonstrates the large number of prominent IMPs on this face of the plasma membrane. large arrow, direction of shadowing of freeze fracture replica. EM taken on 11/11/75 by R. Allen with JEM 100B operating at 80kV. Neg. 21,578X. Bar = 0.20µm. 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:39326) 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
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 3678px ——