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Fixation and Sectioning

Fixation and Sectioning

Two basic types of preparation are used to visualize specimens with a light microscope: wet mounts and fixed specimens.
The simplest type of preparation is the wet mount, in which the specimen is placed in a drop of liquid on the slide. A liquid specimen can be directly deposited on the slide using a dropper. Solid specimens, such as skin scraping, can be placed on the slide before adding a drop of liquid to prepare the wet mount. Sometimes the liquid is simply water, but stains are often added...

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Related Experiment Video

Updated: May 23, 2026

Basic Caenorhabditis elegans Methods: Synchronization and Observation

Basic Caenorhabditis elegans Methods: Synchronization and Observation

Published on: June 10, 2012

Fixing Caenorhabditis elegans in Bouin's fixative.

Ed Harlow, David Lane

|April 10, 2012

Summary

Bouin's fixative effectively penetrates worm tissues and preserves antigens. However, it can interfere with certain antibody-antigen pairs, necessitating shorter fixation times or alternative methods like paraformaldehyde fixation.

Area of Science:

Histology and Immunohistochemistry
Parasitology
Biochemistry

Background:

Bouin's fixative is a commonly used histological fixative.
Effective tissue penetration and antigen preservation are critical for microscopic analysis.
Certain fixatives can interfere with specific antigen-antibody interactions.

Purpose of the Study:

To evaluate the suitability of Bouin's fixative for worm tissue fixation.
To identify limitations of Bouin's fixative concerning antigenicity.
To propose alternative fixation strategies when Bouin's fixative is unsuitable.

Main Methods:

Tissue fixation using Bouin's fixative.
Assessment of tissue penetration.
Evaluation of antigen preservation and antibody binding.

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Main Results:

Bouin's fixative demonstrates excellent tissue penetration in worms.
Bouin's fixative is highly effective for antigen fixation.
Potential for interference with specific antibody-antigen pairs was observed.

Conclusions:

Bouin's fixative is a valuable tool for worm histology and antigen fixation.
Adjusting fixation duration or using paraformaldehyde fixation can overcome limitations with certain antibody-antigen pairs.