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

CIL:35956*  Cite 
Description

The image shows the surface of the ribbon-like myofibrils, with some remnants of the SR attached mostly at the Z lines. The regular disposition of attached cross bridges is visible in many areas. Most images of this group show fractures through the outer membrane of mitochondria and SR/T tubules of dyads nestled in long grooves of the mitochondrial surface. All leaflets of the membranes appear in the images. References for the image: Loesser, K.E. and Franzini-Armstrong, C. A simple method for freeze-drying of macromolecules and macromolecular complexes. J. Struct. Biol. 103: 48-56, 1990. Bard, F., Franzini-Armstrong, C. and Ip W. Rigor cross bridges are double headed in fast muscle from crayfish. J. Cell Biol. 105: 2225-2234, 1987.

Technical Details

Negatives scanned at LBL then reduced in size for upload TEM magnifications not currently available. Scan step size is 6.3 micron, then reduced in size 4X for upload, for an effective pixel size of 25 micron. Heads and tail were removed, the thorax was bisected and immersed in 100 mM KCl, 10 mM EDTA, 10 Triton X for a few hrs, to depolarize and skin the fibers, then maintained at -20 C in 50% glycerol in the same solution for several weeks to induce rigor by eliminating ATP. The muscle was gently homogenized in a waring blender in 0.9% NaCl. The fibrils were deposited on glass and sequentially fixed in 0.1% glutaraldehyde in 0.1 M cacodylate buffer, rinsed in 100 mM ammonium acetate, treated with 1% uranyl acetate for 30 seconds, rinsed in 40% methanol and frozen in liquid nitrogen. The fibrils were freeze dried at -90 C for 30 minutes and rotary shadowed with platinum either at 25C or 45C in a Balzer’s 400 freeze fracture. The glass was dissolved in hydrofluoric acid and the replicas were mounted on copper grids and examined in a Philips 410 Microscope.

Biological Sources
NCBI Organism Classification
damselfly
Cell Type
flight muscle cell
Cellular Component
myofibril
mitochondrion
sarcoplasmic reticulum
Attribution
Names
Clara Franzini-Armstrong
Citation
Digital Object Identifier (DOI)
doi:10.7295/W9CIL35956
Archival Resource Key (ARK)
ark:/b7295/w9cil35956
Grouping This image is part of a group.
Imaging
Image Type
transmission electron microscopy (TEM)
Image Mode
transmission electron microscopy (TEM)
Parameters Imaged
electron density
Source of Contrast
differences in deposition of metal shadow
Visualization Methods
shadowing and plating
Processing History
digitized negative film
Data Qualifiers
raw, unprocessed data
suitable for spatial measurements
Sample Preparation
Methods
glutaraldehyde fixed tissue
freeze_fracture/freeze_etch
Relation To Intact Cell
unembedded tissue
Dimensions
Spatial Axis Image Size Pixel Size
X 2500px ——
Y 3465px ——