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

CIL:24842*  Cite 

Scanning electron micrograph showing the tip of a Hydra viridis tentacle. A meshwork of triggered nematocyst cells is visible. When hooked cnidocytes on the surface of the tentacle come in contact with prey, they release a coiled nematocyst. Extension of the nematocyst thread allows the tentacle to latch onto the prey, and this signals the hypostome, or mouth, to open. Specimens were fixed in Aldehyde-osmium fixative 0.75% glutaraldehyde, 0.75% formaldehyde and 1.0% OsO4 prepared in 0.05M sodium cacodylate buffer. Fixative was buffered to pH 7.4-7.5. H. viridis were critical point dried and sputter coated with gold. Images were taken on a FEI Quanta 200 ESEM scanning electron micrograph. This sample was photographed as a montage at a magnification of 5662x and an accelerating voltage of 15kV with a 9.7mm working distance.

Biological Sources
NCBI Organism Classification
Hydra viridis
Cell Type
Marian Rice
Allison Miller
Digital Object Identifier (DOI)
Archival Resource Key (ARK)
Grouping This image is part of a group.
Image Type
scanning electron microscopy (SEM)
Image Mode
scanning electron microscopy (SEM)
Parameters Imaged
secondary electron generation
Data Qualifiers
raw, unprocessed data
suitable for spatial measurements
Spatial Axis Image Size Pixel Size
X 1024px 2.12nm
Y 943px 2.12nm