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相关概念视频

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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Super-resolution Fluorescence Microscopy01:37

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Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been...
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Updated: Jul 1, 2025

Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
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使用超快电子衍射的分子量子断层扫描.

Jiayang Jiang1, Ming Zhang2, Aosheng Gu1

  • 1Departments of Chemistry and Physics, University of Toronto, Toronto, Ontario M5S 3H6, Canada.

The Journal of chemical physics
|March 8, 2024
PubMed
概括

我们开发了一种量子断层扫描方法,通过超快电子衍射重建分子电子状态. 这种技术允许可视化电子动态,就像一个"分子电影",捕捉连贯性和人口转移.

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科学领域:

  • 量子化学 是一个量子化学.
  • 频谱学是一种光谱学.
  • 化学物理 化学物理

背景情况:

  • 超快电子衍射 (UED) 探测分子动力学.
  • 从UED重建电子状态演变是具有挑战性的.

研究的目的:

  • 开发一种量子断层扫描 (QT) 方法来检索时间演变的低密度矩阵.
  • 使用UED可视化分子动力学中的电子自由度.

主要方法:

  • 使用ab initio CASSCF模拟核波束动力学和光激活醇的UED.
  • 应用 QT 来从模拟的时间解析衍射数据中重建密度矩阵.

主要成果:

  • 在糖尿病的基础上成功地检索了演变密度矩阵.
  • 揭示了激发的pyrrole波袋的对称性.
  • 证明了 QT 能够捕捉电子状态连贯性和人口转移的能力.

结论:

  • 拟议的QT方法使电子动态的量子级"分子电影"成为可能.
  • 现在,UED可以揭示电子状态连贯性,放松性和人口转移动态.