Electron Microscopy Sample Preparation
Electron Microscopy Sample Preparation - Related Videos
01:20
Preparation of Samples for Electron Microscopy
0 Views •
2023
To be visualized by an electron microscope, either transmission or scanning, biological samples need to be fixed (stabilized) so the electron beam does not destroy them and dried thoroughly (desiccated/dehydrated) so the vacuum does not affect them. Fixation needs to be done as quickly as possible because the sample properties will start changing as soon as it is removed from its natural environment. For example, in a tissue sample, the oxygen levels begin decreasing, causing an altered...
06:10
Preparation of Sample Support Films in Transmission Electron Microscopy using a Support Floatation Block
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Cited by 10 •
2021
Sample preparation for cryo-electron microscopy (cryo-EM) is a significant bottleneck in the structure determination workflow of this method. Here, we provide detailed methods for using an easy-to-use, three-dimensionally printed block for the preparation of support films to stabilize samples for transmission EM studies.
06:32
Optimizing Sample Preparation for Cryogenic Electron Microscopy
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2025
This protocol presents a practical method using Methanocaldococcus jannaschii (MjsHSP16.5) as an example to address uneven particle distribution through sample preparation optimization, providing a reference for researchers to efficiently elucidate macromolecular structures using cryogenic electron microscopy (cryo-EM).
09:04
Miniaturized Sample Preparation for Transmission Electron Microscopy
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Cited by 11 •
2018
An instrument and methods for the preparation of nanoliter-sized sample volumes for transmission electron microscopy is presented. No paper-blotting steps are required, thus avoiding the detrimental consequences this can have for proteins, significantly reducing sample loss and enabling the analysis of single cell lysate for visual proteomics.
03:48
Preparation of Retinal Samples for Volume Electron Microscopy
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2024
This protocol describes the detailed steps for preparing retinal samples for volume electron microscopy, focusing on the structural features of retinal photoreceptor terminals.
FAQs
Fixation stabilizes cellular components before later handling, helping preserve structural relationships during dehydration, embedding, sectioning, or drying. This step is therefore not merely preparative: it influences how faithfully membranes, organelles, viruses, or tissue organization remain represented. In biological studies, preservation is essential when the goal is to interpret fine ultrastructural features rather than only overall specimen shape.
Dehydration removes water before the specimen enters the microscope’s vacuum, helping it withstand that environment. It also prepares the specimen for the next route: resin embedding and ultrathin sectioning in transmission electron microscopy, or drying and conductive coating in scanning electron microscopy. Water removal therefore connects preservation to modality-specific preparation.
Transmission electron microscopy requires resin embedding and ultrathin sectioning, creating preparations for examining ultrastructural organization. Scanning electron microscopy instead uses drying and conductive coating, producing a different specimen configuration for imaging. The choice is therefore tied to the preparation route and the structural information the biological investigation seeks to examine.
A conductive coating is used in scanning electron microscopy to reduce charging under the electron beam. Charging can interfere with imaging, so the coating helps establish more stable imaging conditions for the specimen. This step belongs specifically to the dried, scanning electron microscopy route, rather than the resin-embedded and ultrathin-sectioned route used for transmission imaging.
A typical workflow begins with fixation, followed by dehydration. The preparation then branches according to the imaging method: transmission electron microscopy uses resin embedding and ultrathin sectioning, whereas scanning electron microscopy uses drying and conductive coating. Each branch creates a specimen form suited to the microscope’s operating conditions and the intended structural observation.
Electron microscopy sample preparation supports investigations in cell biology, microbiology, and pathology by enabling examination of membranes, organelles, viruses, and tissue organization. It also contributes to materials-related investigations. The resulting images can connect cellular structure with biological research questions that require ultrastructural detail beyond what overall specimen appearance can provide.