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Overview of Electron Microscopy01:25

Overview of Electron Microscopy

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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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Preparation of Samples for Electron Microscopy01:20

Preparation of Samples for Electron Microscopy

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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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Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

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Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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Electron Microscope Tomography and Single-particle Reconstruction01:07

Electron Microscope Tomography and Single-particle Reconstruction

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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.
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...
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Three-Dimensional Microscopy in Microbiology01:28

Three-Dimensional Microscopy in Microbiology

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Three-dimensional imaging techniques are essential in cell biology, allowing researchers to visualize intricate cellular structures with high resolution. Two prominent methods, Differential Interference Contrast Microscopy (DIC) and Confocal Scanning Laser Microscopy (CSLM), provide distinct advantages for imaging live and thick specimens, respectively.Differential Interference Contrast MicroscopyDIC microscopy enhances contrast in transparent, unstained samples by converting phase...
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Fixation and Sectioning01:03

Fixation and Sectioning

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Two basic types of preparation are used to visualize specimens with a light microscope: wet mounts and fixed specimens.
The simplest type of preparation is the wet mount, in which the specimen is placed in a drop of liquid on the slide. A liquid specimen can be directly deposited on the slide using a dropper. Solid specimens, such as skin scraping, can be placed on the slide before adding a drop of liquid to prepare the wet mount. Sometimes the liquid is simply water, but stains are often added...
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Updated: Sep 10, 2025

Visualization of Organelles In Situ by Cryo-STEM Tomography
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厚い生物標本における電子顕微鏡によるコントラスト

Peter Rez1, Lothar Houben2, Shahar Seifer3

  • 1Department of Physics, Arizona State University, Tempe, Arizona, USA.

Journal of microscopy
|August 26, 2025
PubMed
まとめ

この研究では,T4ファグのような厚い生物サンプルを電子顕微鏡で相と振幅のコントラストを調査しています. STEMイメージングは,ガラスの氷の生物学的構造の高解像度イメージングのTEMよりも潜在的な利点を示しています.

キーワード:
エールスモンテカルロシミュレーションSTEMについてTEMクリオ電子顕微鏡エネルギー損失イメージングマルチスライスシミュレーション

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Preparation and Observation of Thick Biological Samples by Scanning Transmission Electron Tomography
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Biological Sample Preparation by High-pressure Freezing, Microwave-assisted Contrast Enhancement, and Minimal Resin Embedding for Volume Imaging
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Biological Sample Preparation by High-pressure Freezing, Microwave-assisted Contrast Enhancement, and Minimal Resin Embedding for Volume Imaging

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関連する実験動画

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Visualization of Organelles In Situ by Cryo-STEM Tomography
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Preparation and Observation of Thick Biological Samples by Scanning Transmission Electron Tomography
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Biological Sample Preparation by High-pressure Freezing, Microwave-assisted Contrast Enhancement, and Minimal Resin Embedding for Volume Imaging
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科学分野:

  • 電子顕微鏡
  • 生物学的なイメージング
  • 材料科学

背景:

  • 一貫した相コントラストと不一致の振幅コントラストは,厚い生物サンプルを画像化するのに不可欠です.
  • 彼らの貢献を理解することは,冷凍電子顕微鏡 (cryo-EM) 技術の進歩に不可欠です.
  • 現在の方法の限界は,高度なイメージングの方法を探求することを必要とします.

研究 の 目的:

  • 濃厚な生物標本における一貫した明るい場相と矛盾した暗い場振幅のコントラストを調査する.
  • 伝送電子顕微鏡 (TEM) とスキャン伝送電子顕微鏡 (STEM) のイメージング能力をシミュレートし,比較する.
  • 電子のエネルギー損失と騒音が低用量条件下での画像品質に与える影響を評価する.

主な方法:

  • 画像シミュレーションのためにT4ファージモデルが構築されました.
  • マルチスライスコードはTEMとSTEMの相対比シミュレーションに使用された.
  • ペネロペ・モンテカルロのコードは 矛盾した振幅のコントラストをシミュレートした
  • 電子の断片を定量化するために,ガラスの氷から電子のエネルギー損失スペクトルを測定した.

主要な成果:

  • TEMの場合,相対照画像は,厚い標本における電子エネルギー損失ピークによって制限されます.
  • 騒音は,高電子曝露でも,冷凍-EMで特徴の区別を大幅に制限します.
  • STEMは,幅度と相対比の両方,特に弱相限界を超えてTEMよりも潜在的な利点を提供しています.

結論:

  • STEMイメージングは,最適化された採取角度を持つ厚い生物サンプル (例えば,1μmの氷のファージ) のイメージング機能の有望性を示しています.
  • 最適なコントラストのために,高い加速電圧 (約700 keV) が提案されています.
  • この発見は,高解像度生物画像の電子顕微鏡技術の最適化に寄与しています.