Negative Stain Electron Microscopy
Negative Stain Electron Microscopy - Related Videos
03:10
Negative Staining of Purified Exosomes: A Procedure to Visualize Exosome Morphology Using Transmission Electron Microscopy
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2023
This video describes a procedure for negative staining of purified exosomes. The negatively stained exosomes are imaged using transmission electron microscopy. This technique helps visualize the morphology of exosomes.
09:37
Optimized Negative Staining: a High-throughput Protocol for Examining Small and Asymmetric Protein Structure by Electron Microscopy
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Cited by 71 •
2014
More than half of proteins are small proteins (molecular mass <200 kDa) that are challenging for both electron microscope imaging and three-dimensional reconstructions. Optimized negative staining is a robust and high-throughput protocol to obtain high contrast and relatively high resolution (~1 nm) images of small asymmetric proteins or complexes under different physiological conditions.
06:06
Variations on Negative Stain Electron Microscopy Methods: Tools for Tackling Challenging Systems
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Cited by 100 •
2018
Negative stain EM is a powerful technique for visualizing macromolecular structure, but different staining techniques can produce varying results in a sample dependent manner. Here several negative staining approaches are described in detail to provide an initial workflow for tackling the visualization of challenging systems.
08:22
Utilization of Capsules for Negative Staining of Viral Samples within Biocontainment
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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.
09:20
Microwave Assisted Rapid Diagnosis of Plant Virus Diseases by Transmission Electron Microscopy
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Cited by 16 •
2011
This study describes a method that allows the rapid and clear diagnosis of plant virus diseases in about half a day by using a combination of microwave assisted plant sample preparation for transmission electron microscopy and negative staining methods.
FAQs
Contrast comes from the different electron-scattering behavior of the specimen and the surrounding heavy-metal stain. Because the stain occupies spaces around the particle, the background appears more electron dense than regions occupied by the specimen. This contrast allows investigators to distinguish overall boundaries and surface features, supporting visual assessment of particle morphology.
Dehydration may alter the specimen before imaging, so the observed shape or surface features can differ from those in the hydrated state. This limitation matters when interpreting apparent structural details or comparing particles. The method therefore provides useful morphological information, but its images should be considered in light of possible structural distortion.
Particle size, shape, and visual uniformity provide an initial assessment of preparation quality. Similar-looking particles suggest greater homogeneity, whereas varied appearances may indicate a mixed or inconsistently assembled sample. These observations can help determine whether a biochemical preparation is suitable for further complex characterization or additional structural analysis.
The workflow begins with a purified biochemical sample, which is placed onto a support film so particles can adsorb to its surface. The preparation is then dried and embedded in a heavy-metal salt. After these steps, the surrounding stain supplies the electron-dense background needed to visualize particle boundaries and surface features.
It is particularly useful for rapidly screening purified proteins and complexes before applying higher-resolution approaches such as cryo-electron microscopy. Researchers can inspect whether particles are present, whether their appearances are broadly consistent, and whether assembly is evident. This makes the technique a practical checkpoint during protein purification and complex characterization.
Images provide structural feedback that complements biochemical preparation steps. Investigators can evaluate whether a purified sample contains particles with the expected size and shape, assess apparent homogeneity, and look for evidence of complex assembly. These observations help guide decisions about sample quality and whether the preparation merits more detailed structural investigation.