Osmium Tetroxide
Osmium Tetroxide - Related Videos
02:44
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
0 Views •
2025
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry. Syn Dihydroxylation Mechanism The reaction comprises a two-step mechanism. It begins with the addition of osmium tetroxide across the alkene double bond in a concerted manner forming a...
08:22
Utilization of Capsules for Negative Staining of Viral Samples within Biocontainment
0 Views •
Cited by 3 •
2017
This protocol provides instruction for negative staining virus samples which can easily be used in BSL-2, -3, or -4 laboratories. It includes the use of an innovative processing capsule, which protects the transmission electron microscopy grid and provides the user easier handling in the more turbulent environments within biocontainment.
10:52
Correlative Light and Electron Microscopy to Study Microglial Interactions with β-Amyloid Plaques
0 Views •
Cited by 30 •
2016
This article describes a protocol for visualizing amyloid Aβ plaques in Alzheimer's disease mouse models using methoxy-X04, which crosses the blood-brain barrier and selectively binds to β-pleated sheets found in dense core Aβ plaques. It allows pre-screening of plaque-containing tissue sections prior to immunostaining and processing for electron microscopy.
04:05
Safe Viral Specimen Preparation for Transmission Electron Microscopy
0 Views •
2026
Source: Blancett, C. D., et al. Utilization of Capsules for Negative Staining of Viral Samples within Biocontainment. J. Vis. Exp. (2017).This video demonstrates the safe viral specimen preparation for transmission electron microscopy. The viral particles are fixed with glutaraldehyde, stained with an electron-dense agent, and subjected to vapor fixation with osmium tetroxide to stabilize structures and ensure complete inactivation, ensuring safe handling of viral samples while improving...
02:53
Ultrastructural Analysis of a Mouse Brain Section Using Transmission Electron Microscopy
0 Views •
2025
Source: Lutz, D., et.al. Assessment of Ultrastructural Neuroplasticity Parameters After In Utero Transduction of the Developing Mouse Brain and Spinal Cord. J. Vis. Exp. (2019).This video demonstrates the preparation and transmission electron microscopy (TEM) analysis of a brain section from a mouse pup. The protocol starts with osmium tetroxide-fixed tissue embedded in resin, followed by precise trimming to isolate the region of interest and ultramicrotomy to produce semithin and ultrathin...
FAQs
Osmium tetroxide reacts with unsaturated lipids in biological tissue, generating electron-dense osmium deposits. These deposits both stabilize lipid-rich structures and increase their contrast under electron microscopy. As a result, membranes become easier to distinguish from surrounding cellular material, allowing researchers to examine fine organization in neuronal tissue at a resolution beyond routine light microscopy.
Unsaturated lipids provide the chemical sites with which osmium tetroxide reacts. Because neuronal membranes and myelin contain lipid-rich material, this reaction preferentially emphasizes those structures and preserves their organization for ultrastructural analysis. The resulting deposits make membrane boundaries, myelin architecture, and other lipid-associated features more conspicuous in electron micrographs.
The treatment particularly highlights membrane-rich components, including neuronal membranes, myelin, and synaptic vesicles. It can also reveal broader cellular organization within neural tissue by combining structural stabilization with electron density. This emphasis is valuable when the research question concerns fine membrane architecture or changes that may not be resolved through light microscopy alone.
Light microscopy may not resolve the ultrastructural organization of neuronal membranes, myelin, or synaptic vesicles. Osmium tetroxide preparation adds electron-dense contrast and stabilizes these features for electron microscopy, enabling higher-resolution examination. The approaches therefore answer different structural questions: light microscopy provides broader visualization, whereas osmium-enhanced electron microscopy exposes finer cellular details and membrane-associated changes.
In neural specimen preparation, osmium tetroxide penetrates the tissue and reacts with unsaturated lipids before electron-microscopic examination. This chemical treatment preserves membrane-rich structures while creating the contrast needed to distinguish them in the final image. Its role is therefore preparative as well as visual, supporting both structural stability and interpretation of ultrastructural organization.
It is especially useful when researchers need to investigate membrane-rich neural structures at high resolution, such as myelin, neuronal membranes, and synaptic vesicles. The method can also support analysis of pathological changes by revealing cellular organization that light microscopy may miss. Its value is greatest when ultrastructural detail is central to the research question.
Osmium tetroxide is volatile, toxic, and corrosive, so its use requires controlled laboratory conditions and careful handling. These hazards make preparation and application inseparable from safety practices. Researchers must treat containment and controlled handling as essential parts of the workflow, rather than as optional precautions, even though the compound provides valuable contrast for neural ultrastructure.
The resulting electron micrographs can show the organization and condition of neuronal membranes, myelin, synaptic vesicles, and related membrane-rich features. Because the deposits stabilize and contrast these structures, researchers can assess fine cellular architecture and identify pathological changes that remain unresolved with light microscopy. Interpretation focuses on ultrastructural patterns rather than on general tissue appearance alone.