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Related Concept Videos

Cryo-electron Microscopy01:28

Cryo-electron Microscopy

3.2K
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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Preparation of Samples for Electron Microscopy01:20

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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...
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Correlative Light- and Electron Microscopy Using Quantum Dot Nanoparticles
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Microfluidic cryofixation for correlative microscopy.

Yara X Mejia1, Holger Feindt, Dongfeng Zhang

  • 1Max Planck Institute for Biophysical Chemistry, 37077 Goettingen, Germany. tburg@mpibpc.mpg.de.

Lab on a Chip
|July 10, 2014
PubMed
Summary
This summary is machine-generated.

We developed a microfluidic method for rapid cell cryofixation within a light microscope. This technique preserves cellular structure for advanced microscopy without disrupting live cell imaging.

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Area of Science:

  • Cell biology
  • Microscopy techniques
  • Biophysics

Background:

  • Cryofixation is crucial for high-quality ultrastructural preservation in electron microscopy.
  • Existing cryofixation methods are incompatible with live cell imaging, limiting correlative studies.
  • There is a need for techniques that bridge live cell dynamics with ultrastructural analysis.

Purpose of the Study:

  • To develop a microfluidic system for cryofixation compatible with light microscopy.
  • To enable high-resolution imaging of live cells immediately prior to ultrastructural preservation.
  • To link dynamic live cell processes with subsequent correlative microscopy.

Main Methods:

  • A novel microfluidic device was engineered for rapid sample manipulation.
  • Cryofixation was performed directly within the field of view of a light microscope.
  • The system operates at atmospheric pressure, facilitating integration with standard microscopes.

Main Results:

  • The microfluidic approach achieved cryofixation with millisecond time resolution.
  • Outstanding ultrastructural preservation was demonstrated, suitable for electron microscopy.
  • The method preserves the ability to image and stimulate live cells prior to fixation.

Conclusions:

  • This microfluidic cryofixation technique bridges the gap between live cell imaging and ultrastructural analysis.
  • It enables correlative light and electron microscopy with unprecedented temporal resolution.
  • The method opens new avenues for studying dynamic cellular processes at the ultrastructural level.