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Updated: Jul 1, 2025

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Published on: March 16, 2022

在低剂量传输电子显微镜中的方形摄像机的方形冷凝器光圈

Hamish G Brown¹, Dan Smith², Benjamin C Wardle³

¹Ian Holmes Imaging Centre and ARC Industrial Training Centre for Cryo Electron Microscopy of Membrane Proteins, The Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Victoria, Australia. hgbrown@unimelb.edu.au.

|March 8, 2024

概括

新的方形和矩形冷凝器光圈板在传输电子显微镜 (TEM) 中提高了70%的面积利用率. 这增强了对光束敏感样品的组装成像,使得高分辨率的结构分析成为可能.

科学领域:

显微镜的使用方法
材料科学材料科学材料科学
结构生物学结构生物学

背景情况:

传输电子显微镜 (TEM) 通常使用圆形电子束,导致不高效的覆盖面积和对束敏感样品的潜在损伤.
在TEM中,圆形光束形状会导致被辐射的区域重叠,从而限制了获取用于组装重建的顺序图像的能力.
对光束敏感的标本需要仔细的曝光管理,以避免在成像过程中发生结构退化.

研究的目的:

开发和评估具有非圆形形状的新型冷凝器光圈板,以提高TEM的面积效率.
增强高分辨率冷TEM中对光束敏感标本的组装成像能力.
为了证明这些新的光圈板在高分辨率结构确定中的实际应用.

主要方法:

设计和制造用于TEM的方形和矩形冷凝器开口板.
在高分辨率的冷TEM设置中实现新的光圈板.
使用修改后的TEM系统从光束敏感标本中获取组装图像.
使用获得的数据重建一个高分辨率的3D地图.

主要成果:

与传统的圆孔相比,正方形和矩形光圈板的面积利用效率提高了70%.
实现了增强的组装成像,允许连续采集数据,而无需显著的重叠或样本损坏.
一个高分辨率的1.8-Å马类apo-ferritin地图被成功重建,证明了系统的能力.

结论:

新的方形和矩形冷凝器开口板显著提高了TEM的面积效率.
这些光圈板与高分辨率低温TEM兼容,对成像光束敏感样本有益.
开发的方法可以通过增强的组合成像,对微妙的生物标本进行高分辨率的结构分析.

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相关概念视频

Transmission Electron Microscopy

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...