from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A pure form of pyroxylin in which specimens for microscopic examination are embedded.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A semisolid solution of pyroxylin in ether and alcohol. Used to embed specimens for microscopy before they are sectioned and placed on slides.
- n. A specimen embedded in celloidin.
from The Century Dictionary and Cyclopedia
- n. A pure form of pyroxylin (guncotton). Dissolved in ether and absolute alcohol in varying proportions, it is extensively used in the histological laboratory for the purpose of embedding tissues for sectioning.
Remove any gelatine from the lumen of the tube with a heated platinum needle; paint the joint between capsule and tube with moderately thick celloidin and allow to dry.
Remove the solution of gelatine from the interior of the celloidin case with a pipette.
Various grades of celloidin, thick and thin, in wide-mouthed bottles.
Dip the capsule into a beaker containing thin celloidin, beyond the junction with the glass and after removal rotate it in front of the blowpipe air blast to dry it evenly.
Apply thick celloidin to the tube-capsule joint, the opposite end of the capsule, and the line of junction of the capsule with its cap; dry thoroughly.
To overcome this, the sections might also be embedded in celloidin.
We call it vividiffusion and it depends for its action on the physical principle of osmosis, the passage of substances of a certain kind through a porous membrane, such as these tubes of celloidin.
Many of the samples fixed in celloidin also float in a liquid preservative that is probably formaldehyde or alcohol.
"The benefit of working with celloidin is that tissue shrinkage is very minimal, and you can see tissue and cell structures very clearly under the microscope," says Archie Fobbs, neuroanatomical collection manager at the museum.
Many of the samples are preserved in celloidin, a hard, rubbery and highly flammable form of cellulose.