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相关概念视频

Immunogold Electron Microscopy01:20

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Immunoelectron microscopy utilizes immunogold labeling of endogenous proteins with specific antibodies to detect and localize these proteins in cells and tissues. The procedure provides insights into the distribution and quantification of protein under different stimulation conditions offering clues about their functions. Conjugating highly electron-dense gold particles with primary or secondary antibodies allow antigen detection on and within cells, with high resolution and specificity.
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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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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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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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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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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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相关实验视频

Updated: Jan 6, 2026

Preparation of Non-human Primate Brain Tissue for Pre-embedding Immunohistochemistry and Electron Microscopy
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免疫电子显微镜:从样品制备到高分辨率成像的全面指南.

Jinsai Wu1, Bo Su1, Leiyan Gu2

  • 1Histology and Imaging Platform, Core Facilities of West China Hospital, Chengdu, 610041, People's Republic of China.

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概括

免疫电子显微镜 (IEM) 使用电子显微镜和免疫标记精确地定位生物分子. 这种技术对于理解细胞结构,疾病标志物和纳米医学等领域的相互作用至关重要.

关键词:
免疫电子显微镜的使用方法在嵌入后的嵌入后.预嵌入 预嵌入 预嵌入量化 量化 量化 量化这里是Tokuyasuasu.

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科学领域:

  • * 超结构生物学和纳米医学.
  • *先进的显微镜和分子定位技术.

背景情况:

  • * 免疫电子显微镜 (IEM) 结合了免疫标记与电子显微镜,用于亚细胞生物分子定位 (<10 nm).
  • * IEM对于分析突触研究中的蛋白质分布,器官相互作用和疾病标志物,病原体与宿主相互作用和瘤微环境至关重要.

研究的目的:

  • * 提供免疫电子显微镜 (IEM) 工作流程的系统分析.
  • *强调固定,脱水和实验方法选择的协同策略.
  • * 引入量化分析框架和多模式集成,以实现功能结构共本地化.

主要方法:

  • *根据标签序列和样本处理,将IEM分为嵌入前和嵌入后的标签技术.
  • * 讨论补充方法:用于标记效率的预嵌入 (敏感抗原) 和用于超结构完整性的后嵌入 (深度抗原可访问性).
  • * 引入使用系统随机抽样 (SUR),深度学习 (Gold Digger),FIB-SEM 3D重建和相关光电子显微镜 (CLEM) 的定量分析.

主要成果:

  • *嵌入前的标签提供了高效率但有限的结构保存;嵌入后提供了更好的结构保存,但面临着树脂透和表位膜掩盖的挑战.
  • * 定量分析框架和多式联运一体化策略能够实现精确的功能结构共定位.
  • * 技术创新和跨平台集成正在推进超结构性病理诊断和精确纳米医学.

结论:

  • * IEM是高分辨率分子定位在亚细胞水平不可或缺的工具.
  • *平衡标签效率和超结构性保存是优化IEM技术的关键.
  • * IEM 工作流程的持续创新和与先进分析工具的整合正在推动诊断和纳米医学的进步.