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

CIL:36744*  Cite 

As with acidosome fusion with the DV-I, lysosome fusion with the DV-II also seems to occur nearly all at once resulting in a phagolysosome (DV-III) with a highly irregular surface. However, unlike the transformation of DV-I into DV-II where the DV-I membrane is removed by immunogold-labeled tubules we have very little immunological evidence that the DV-II membrane is removed during the transition from phagoacidosome to phagolysosome. Although there is some morphological indication for tubular and vesicular formation around these early phagolysosomes that might indicate a similar transformation. The vacuole contents seen here are thought to be the lipid micelles of the axenic medium. TEM taken on 2/27/80 by R. Allen with Hitachi HU11A operating at 75kV. Neg. 7,000X. Bar = 1µm.

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
food vacuole
Biological Context
Biological Process
digestive system process
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 2280px ——
Y 2424px ——