Fixative Instillation
Fixative Instillation - Related Videos
06:57
Instillation and Fixation Methods Useful in Mouse Lung Cancer Research
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Cited by 48 •
2015
The goal of this paper is to describe simple methods that will greatly aid in the setup and analysis of mouse lungs with lung cancer or other pathologies. We present 3 protocols to simply and reliably carry out lung instillations, fixation, and lung volume measurements.
05:35
Lung Instillation and Fixation: Introducing Liquid into the Trachea and Fixing Lungs to Measure the Fixed Lung Volume
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2023
This video describes a simple and reliable method of introducing liquid into the trachea for lung instillation, fixation, and lung volume measurement.
04:50
Direct Tracheal Instillation of Solutes into Mouse Lung
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Cited by 54 •
2010
Intratracheal instillations deliver solutes directly into the lungs. This procedure targets the delivery of the instillate into the distal regions of the lung, and is therefore often incorporated in studies aimed at studying alveoli. We provide a detailed survival protocol for performing intratracheal instillations in mice.
04:46
Intrabronchial Instillation of Streptococcus pneumoniae in Immunocompetent Rodent Models
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2025
This video demonstrates the establishment of lung infection in an immunocompetent rodent model via intubation and installation of bacterial suspensions into lung lobes. This model enables antibacterial efficacy studies in immunocompetent animals.
08:53
Whole Animal Perfusion Fixation for Rodents
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Cited by 531 •
2012
Here we describe a low-cost, rapid, controlled and uniform fixation procedure using 4% paraformaldehyde perfused via the vascular system: through the heart of the rat to obtain the best possible preservation of the brain.
FAQs
The fixative stabilizes biological material by chemically modifying macromolecules, commonly through protein cross-linking or precipitation. These reactions reduce structural movement and help maintain the relationships among cells and tissue components. Preserving those relationships is important because microscopy and histological examination depend on recognizable architecture rather than isolated cellular remnants.
Penetration determines whether internal regions receive enough solution to stabilize their components before degradation alters them. When the fixative reaches internal surfaces and tissue compartments, preservation becomes more uniform across the specimen. This supports anatomical and microscopic observations that might otherwise be distorted by differences between exposed areas and poorly reached regions.
Chemical fixation stabilizes macromolecules and reduces the biological activity that can break down tissue after collection. By limiting enzymatic degradation and microbial decay, it helps preserve cellular detail long enough for examination and processing. The result is a specimen whose morphology more closely reflects its original organization than one undergoing uncontrolled deterioration.
A general workflow identifies the specimen or compartment requiring preservation, introduces the chemical fixative into that target region, and permits the solution to reach relevant internal surfaces and structures. The preserved material can then undergo histological processing, anatomical study, or microscopy. The central procedural goal is consistent exposure rather than preservation only at the outer surface.
Instillation is particularly relevant when preservation must extend into an organ, tissue compartment, or hollow structure whose internal surfaces are important to the study. Introducing the solution into the target region can support more even preservation than exposure limited to the exterior. This makes the approach useful for morphology-focused investigations requiring internal architectural detail.
Successfully preserved specimens can retain tissue architecture and cellular detail for histological processing, anatomical examination, and microscopy. These observations may support analysis of how structures are arranged within a specimen and provide material for downstream analyses. Reliable preservation improves interpretation because observed morphology is less likely to reflect post-collection degradation.