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相关概念视频

Overview of Electron Microscopy01:25

Overview of Electron Microscopy

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.
Three-Dimensional Microscopy in Microbiology01:28

Three-Dimensional Microscopy in Microbiology

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...
Transmission Electron Microscopy01:15

Transmission Electron Microscopy

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 keV in...
Electron Microscope Tomography and Single-particle Reconstruction01:07

Electron Microscope Tomography and Single-particle Reconstruction

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...
Two-Dimensional Microscopy in Microbiology01:29

Two-Dimensional Microscopy in Microbiology

Two-dimensional (2D) microscopy encompasses a range of optical techniques that capture images within a single focal plane, offering detailed representations of microscopic structures. These techniques are essential in biological and medical research, enabling the visualization of cellular and subcellular structures with different levels of contrast and specificity.There are several major types of 2D microscopy, each with strengths and applications.Bright-Field MicroscopyBright-field microscopy...
Scanning Electron Microscopy01:07

Scanning Electron Microscopy

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.
Fundamental Principles
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相关实验视频

Updated: Jun 14, 2026

Obtaining 3D Chemical Maps by Energy Filtered Transmission Electron Microscopy Tomography
08:15

Obtaining 3D Chemical Maps by Energy Filtered Transmission Electron Microscopy Tomography

Published on: June 9, 2018

四维电子显微镜四维电子显微镜

Ahmed H Zewail1

  • 1Physical Biology Center for Ultrafast Science & Technology, California Institute of Technology, Pasadena, CA 91125, USA. zewail@caltech.edu

Science (New York, N.Y.)
|April 10, 2010
PubMed
概括
此摘要是机器生成的。

超快速电子显微镜 (4D UEM) 将时间引入第四维,使原子尺度的3D成像成为可能. 这种先进的技术可视化材料和生物学中的动态过程,具有前所未有的分辨率.

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Visualization of Endosome Dynamics in Living Nerve Terminals with Four-dimensional Fluorescence Imaging
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Visualization of Endosome Dynamics in Living Nerve Terminals with Four-dimensional Fluorescence Imaging

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Energy Dispersive X-ray Tomography for 3D Elemental Mapping of Individual Nanoparticles
10:00

Energy Dispersive X-ray Tomography for 3D Elemental Mapping of Individual Nanoparticles

Published on: July 5, 2016

相关实验视频

Last Updated: Jun 14, 2026

Obtaining 3D Chemical Maps by Energy Filtered Transmission Electron Microscopy Tomography
08:15

Obtaining 3D Chemical Maps by Energy Filtered Transmission Electron Microscopy Tomography

Published on: June 9, 2018

Visualization of Endosome Dynamics in Living Nerve Terminals with Four-dimensional Fluorescence Imaging
10:51

Visualization of Endosome Dynamics in Living Nerve Terminals with Four-dimensional Fluorescence Imaging

Published on: April 16, 2014

Energy Dispersive X-ray Tomography for 3D Elemental Mapping of Individual Nanoparticles
10:00

Energy Dispersive X-ray Tomography for 3D Elemental Mapping of Individual Nanoparticles

Published on: July 5, 2016

科学领域:

  • 物理 物理学 物理
  • 材料科学 材料科学 材料科学
  • 生物学 生物学 生物学
  • 显微镜的使用方法

背景情况:

  • 电子显微镜是一种强大的成像工具,可以在原子尺度上解析3D结构.
  • 它的应用涵盖了材料科学和生物学.
  • 传统显微镜的记录速度受限,阻碍了对动态过程的研究.

研究的目的:

  • 通过结合第四个维度:时间,回顾最近电子显微镜的进步.
  • 突出超快电子显微镜 (4D UEM) 的功能.
  • 讨论4D电子显微镜的新兴应用和未来方向.

主要方法:

  • 介绍时间作为电子显微镜中的第四维度.
  • 单电子电波成像技术. 单电子电波成像技术.
  • 4D UEM 变体的开发:融合光束,近场成像,断层扫描和扫描脉冲显微镜.

主要成果:

  • 超快速电子显微镜 (4D UEM) 的分辨率比传统方法高出10个数量级.
  • 能够可视化复杂的结构,跨越长度和时间尺度展开.
  • 展示了用于成像动态纳米材料和生物结构的应用.

结论:

  • 4D UEM通过添加时间维度显著增强成像能力.
  • 该技术允许以原子分辨率研究动态现象.
  • 未来的研究将探索纳米材料,生物结构和时空成像的进一步应用.