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Related Concept Videos

Overview of Microscopy Techniques01:22

Overview of Microscopy Techniques

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The early pioneers of microscopy opened a window into the invisible world of microorganisms. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes that leveraged nonvisible light, such as fluorescence microscopy that uses an ultraviolet light source and electron microscopy that uses short-wavelength electron beams. These advances significantly improved magnification, image resolution, and contrast. By comparison, the...
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Immunoelectron microscopy utilizes immunogold labeling of endogenous proteins with specific antibodies to detect and localize these proteins in cells and tissues. The procedure provides insights into the distribution and quantification of protein under different stimulation conditions offering clues about their functions. Conjugating highly electron-dense gold particles with primary or secondary antibodies allow antigen detection on and within cells, with high resolution and specificity.
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Conventional electron microscopy (EM) involves dehydration, fixation, and staining of biological samples, which distorts the native state of biological molecules and results in several artifacts. Also, the high-energy electron beam damages the sample and makes it difficult to obtain high-resolution images. These issues can be addressed using cryo-EM, which uses frozen samples and gentler electron beams. The technique was developed by Jacques Dubochet, Joachim Frank, and Richard Henderson, for...
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Overview of Electron Microscopy01:25

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The wavelengths of visible light ultimately limit the maximum theoretical resolution of images created by light microscopes. Most light microscopes can only magnify 1000X, and a few can magnify up to 1500X. Electrons, like electromagnetic radiation, can behave like waves, but with wavelengths of 0.005 nm, they produce significantly greater resolution up to 0.05 nm as compared to 500 nm for visible light. An electron microscope (EM) can create a sharp image that is magnified up to 2,000,000X.
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Updated: May 15, 2025

Nano-fEM: Protein Localization Using Photo-activated Localization Microscopy and Electron Microscopy
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Platinum Nanozyme Probes for Cellular Imaging by Electron Microscopy.

Elisa De Luca1,2,3, Deborah Pedone1, Anna Scarsi1

  • 1Nanobiointeractions&Nanodiagnostics Istituto Italiano di Tecnologia via Morego 30 16163 Genova Italy.

Small Science
|April 11, 2025
PubMed
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Platinum nanozymes offer a 10-fold signal boost for transmission electron microscopy (TEM) imaging. This breakthrough enables sensitive detection of nanoparticles in complex cellular environments, advancing electron microscopy techniques.

Keywords:
cellular imagingnanozyme probesplatinum nanoparticlestransmission electron microscopy

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Area of Science:

  • Nanotechnology
  • Biotechnology
  • Materials Science

Background:

  • Traditional amplification methods in transmission electron microscopy (TEM) face limitations in complex cellular environments.
  • Detecting small nanoparticles (3-20 nm) within cells using TEM can be challenging.

Purpose of the Study:

  • To leverage the peroxidase-like activity of platinum nanozymes for enhanced signal amplification in TEM.
  • To demonstrate the utility of platinum nanozymes as a superior alternative to conventional amplification strategies in cellular imaging.

Main Methods:

  • Utilized platinum nanozymes (3-20 nm) with inherent peroxidase-like activity.
  • Catalyzed the oxidation of 3,3'-diaminobenzidine (DAB) substrate, leading to an electron-dense precipitate around nanozymes.
  • Employed osmium staining for enhanced signal visualization.
  • Applied the method to immuno-electron microscopy (immuno-EM) and protein trafficking studies.

Main Results:

  • Achieved up to a 10-fold catalytic signal enhancement.
  • Enabled rapid detection of even 3 nm platinum particles at low TEM magnification across wide fields of view.
  • Demonstrated versatility in tracking subcellular localization of biomolecules in immuno-EM and protein trafficking.

Conclusions:

  • Platinum nanozymes provide a powerful amplification strategy for TEM, surpassing gold or silver enhancements.
  • This nanozyme-based approach represents a paradigm shift in electron microscopy for cellular analysis.
  • Offers enhanced imaging capabilities for precise subcellular localization and biomolecular tracking.