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相关概念视频

X-ray Diffraction of Biological Samples01:10

X-ray Diffraction of Biological Samples

4.0K
X-ray diffraction or XRD is an analytical tool that utilizes X-rays to study ordered structures such as crystalline organic and inorganic samples, polycrystalline materials, proteins, carbohydrates, and drugs.
According to Bragg's law, when X-rays strike the sample positioned on a stage, the rays are  scattered by the electron clouds around the sample atoms. The  X-ray diffraction or scattering is caused by constructive interference of the X-ray waves that reflect off the internal...
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X-ray Crystallography02:18

X-ray Crystallography

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The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
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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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X-ray Imaging01:24

X-ray Imaging

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German physicist Wilhelm Röntgen (1845–1923) was experimenting with electrical current when he discovered that a mysterious and invisible "ray" would pass through his flesh but leave an outline of his bones on a screen coated with a metal compound. In 1895, Röntgen made the first durable record of the internal parts of a living human: an "X-ray" image (as it came to be called) of his wife’s hand. Scientists worldwide quickly began their own experiments with...
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Computed Tomography01:10

Computed Tomography

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Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
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相关实验视频

Updated: Sep 9, 2025

Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
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Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene

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用加权复杂结构张量进行单射线连贯衍射成像

Zhengyu Wu, Guancheng Huang, Sida Gao

    Optics letters
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    PubMed
    概括
    此摘要是机器生成的。

    这项研究引入了一种新的无监督方法,用于一次性相位检索,改进图像细节的重建. 这种算法提高了复杂物体的精度, 即使测量和噪音有限.

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    An All-in-one Sample Holder for Macromolecular X-ray Crystallography with Minimal Background Scattering
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    Biochemical and Structural Characterization of the Carbohydrate Transport Substrate-binding-protein SP0092
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    相关实验视频

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    Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
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    Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene

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    An All-in-one Sample Holder for Macromolecular X-ray Crystallography with Minimal Background Scattering
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    Biochemical and Structural Characterization of the Carbohydrate Transport Substrate-binding-protein SP0092
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    科学领域:

    • 一致的成像
    • 计算机成像
    • 图像重建

    背景情况:

    • 阶段检索对于在连贯成像中重建振幅和阶段至关重要.
    • 由于有限的测量,单射阶段检索面临挑战,阻碍细节分辨率.

    研究的目的:

    • 开发一个无监督的,耐噪声的单射相检索算法.
    • 在复杂的物体中增强细节和纹理的重建.

    主要方法:

    • 交替方向优化的整合.
    • 权重复杂结构张量总变化规范化的应用.
    • 将数据与纹理保持在平衡中.

    主要成果:

    • 拟议的算法证明了噪声的稳定性.
    • 复杂的幅度重建成功的丰富的纹理对象.
    • 在模拟和实验中提高准确度和细节分辨率.

    结论:

    • 开发的方法有效地解决了单次阶段检索的局限性.
    • 它提供了一个强大的解决方案来重建具有复杂价值的对象.
    • 这种方法显示出先进成像应用的巨大潜力.