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関連する概念動画

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

6.9K
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...
6.9K
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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関連する実験動画

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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重み付けされた複合構造テンソールによる単発コヒーレント difraktion イメージング

Zhengyu Wu, Guancheng Huang, Sida Gao

    Optics letters
    |August 29, 2025
    PubMed
    まとめ
    この要約は機械生成です。

    この研究は,画像の詳細の再構築を改善する単発フェーズ検索のための新しい無監督方法を導入します. このアルゴリズムは 複雑なオブジェクトの精度を 制限された測定とノイズでも高めます

    さらに関連する動画

    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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    関連する実験動画

    Last Updated: Sep 9, 2025

    Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
    08:44

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    Published on: August 22, 2017

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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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    科学分野:

    • 一貫したイメージング
    • コンピュータ画像
    • 画像再構築

    背景:

    • フェーズ回収は,一貫したイメージングで振幅とフェーズを再構築するために不可欠です.
    • シングルショット・フェーズの検索は,限られた測定により,細部解像度を阻害する課題に直面しています.

    研究 の 目的:

    • 無監督でノイズに耐える 単発フェーズ検索アルゴリズムを開発する.
    • 複雑な価値のあるオブジェクトの細かい詳細とテクスチャの再構築を強化します.

    主な方法:

    • 方向転換の最適化を統合する.
    • 重み付けの複合構造テンソールの総変数正規化の適用.
    • バランスの取れたデータとテクスチャの保存

    主要な成果:

    • 提案されたアルゴリズムは騒音の強度を示しています.
    • 質感豊かなオブジェクトの複雑な振幅の再構築に成功しました.
    • シミュレーションや実験で精細な解像度を高めました

    結論:

    • 開発された方法は,単発フェーズ回収の限界を効果的に解決します.
    • 複雑な値のオブジェクトを高精度で再構築するための堅牢なソリューションを提供します.
    • このアプローチは,高度なイメージングアプリケーションのための大きな可能性を示しています.