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Scanning Electron Microscopy01:07

Scanning Electron Microscopy

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A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
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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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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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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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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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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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Preparation and Observation of Thick Biological Samples by Scanning Transmission Electron Tomography
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Preparation and Observation of Thick Biological Samples by Scanning Transmission Electron Tomography

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イベント対応スキャニング伝送電子顕微鏡

Jonathan J P Peters1,2,3, Bryan W Reed4, Yu Jimbo5

  • 1Advanced Microscopy Laboratory, CRANN, Trinity College Dublin, The University of Dublin, Dublin, Ireland.

Science (New York, N.Y.)
|August 1, 2024
PubMed
まとめ
この要約は機械生成です。

この研究は,サンプルからの情報回収を強化するイベント対応電子顕微鏡技術を導入しています. リアルタイムのイベントに基づいて 電子の量を調整することで 放射線に敏感な材料の損傷を最小限にします

さらに関連する動画

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Large-scale Scanning Transmission Electron Microscopy Nanotomy of Healthy and Injured Zebrafish Brain
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関連する実験動画

Last Updated: Jun 18, 2025

Preparation and Observation of Thick Biological Samples by Scanning Transmission Electron Tomography
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Preparation and Observation of Thick Biological Samples by Scanning Transmission Electron Tomography

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Array Tomography Workflow for the Targeted Acquisition of Volume Information using Scanning Electron Microscopy
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Large-scale Scanning Transmission Electron Microscopy Nanotomy of Healthy and Injured Zebrafish Brain
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Large-scale Scanning Transmission Electron Microscopy Nanotomy of Healthy and Injured Zebrafish Brain

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科学分野:

  • 材料科学
  • 顕微鏡検査
  • 物理学

背景:

  • 伝送電子顕微鏡 (TEM) の高エネルギー電子はサンプル損傷を引き起こし,イメージング能力を制限する.
  • 現在のTEM方法は,特定のピクセルまたはサンプルにとって最適なレベルを超えた固定された電子用量をしばしば提供します.

研究 の 目的:

  • 電子顕微鏡のためのイベント対応画像アプローチを開発する.
  • 電子毎の情報を取得し,全体的な放射線量を減らすために.
  • ビームに敏感な材料への適用性を実証する.

主な方法:

  • 電子数値の値に達するまでの時間を測定することで,イベント対応イメージング戦略を実装した.
  • 電子ビームを動的に遮断した
  • 目標のシグナル対ノイズ比率を達成するために,電子の量を適応的に配分する.

主要な成果:

  • イベント対応アプローチは,従来の固定用量方法と比較して,電子あたりより多くの情報を得ます.
  • 望ましいシグナル/ノイズ比率を達成するには,全体的な電子用量を減らす必要があります.
  • 放射線に敏感な生物組織とゼオライト構造を 画像化しました

結論:

  • イベント応答性電子顕微鏡は,用量効率の良いイメージングソリューションを提供します.
  • この方法は,特に繊細なサンプルの場合,放射線による損傷を大幅に軽減します.
  • この技術は,顕微鏡における様々なビーム感受性物質に広く適用できます.