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Electron Microscope Tomography and Single-particle Reconstruction01:07

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Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
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Electron tomography can be performed either in TEM or STEM (scanning transmission...
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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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Determination of Crystal Structures01:29

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In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
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Transmission Electron Microscopy01:15

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In 1931, physicist Ernst Ruska—building on the idea that magnetic fields can direct an electron beam just as lenses can direct a beam of light in an optical microscope—developed the first prototype of the electron microscope. This development led to the development of the field of electron microscopy. In the transmission electron microscope (TEM), electrons are produced by a hot tungsten element and accelerated by a potential difference in an electron gun, which gives them up to 400...
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Video Experimental Relacionado

Updated: Mar 14, 2026

Visualization of ATP Synthase Dimers in Mitochondria by Electron Cryo-tomography
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Tomografía de electrones atómicos: estructuras 3D sin cristales

Jianwei Miao1, Peter Ercius2, Simon J L Billinge3

  • 1Department of Physics and Astronomy and California NanoSystems Institute, University of California, Los Angeles, CA 90095, USA. miao@physics.ucla.edu.

Science (New York, N.Y.)
|October 7, 2016
PubMed
Resumen
Este resumen es generado por máquina.

La tomografía electrónica atómica revela la estructura atómica 3D de los materiales, superando las limitaciones de la cristalografía para los defectos y la materia no cristalina. Esta avanzada técnica de imagen permite la localización atómica precisa y el análisis de defectos.

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Área de la Ciencia:

  • Ciencias de los materiales
  • La física
  • Química

Sus antecedentes:

  • La cristalografía está limitada en el análisis de materiales con defectos y desorden.
  • La ciencia moderna requiere comprender la estructura atómica 3D de los materiales imperfectos.

Conclusiones:

  • La tomografía electrónica atómica es una herramienta poderosa para la investigación de la ciencia de los materiales.
  • Los avances adicionales abordarán problemas de larga data en las ciencias físicas.
  • Esta metodología interdisciplinaria abre nuevas vías para el descubrimiento científico.