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相关概念视频

Phase Contrast and Differential Interference Contrast Microscopy01:26

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Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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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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X-ray Diffraction of Biological Samples01:10

X-ray Diffraction of Biological Samples

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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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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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Three-Dimensional Microscopy in Microbiology01:28

Three-Dimensional Microscopy in Microbiology

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Three-dimensional imaging techniques are essential in cell biology, allowing researchers to visualize intricate cellular structures with high resolution. Two prominent methods, Differential Interference Contrast Microscopy (DIC) and Confocal Scanning Laser Microscopy (CSLM), provide distinct advantages for imaging live and thick specimens, respectively.Differential Interference Contrast MicroscopyDIC microscopy enhances contrast in transparent, unstained samples by converting phase...
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Electron Microscope Tomography and Single-particle Reconstruction01:07

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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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Updated: Jun 6, 2025

Phase Contrast and Differential Interference Contrast DIC Microscopy
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不同相位对比强度差折射断层扫描.

Zhidong Bai, Shun Zhou, Habib Ullah

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    此摘要是机器生成的。

    不同相位对比强度衍射断层扫描 (DPC-IDT) 通过从最小强度测量中重建折射率分布,实现高速,无运动的3D成像. 这种无标签的技术显著提高了未染色的生物样本的成像速度.

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    科学领域:

    • 光学显微镜是一种光学显微镜.
    • 计算机成像成像技术
    • 生物物理学的生物物理.

    背景情况:

    • 强度衍射断层扫描 (IDT) 是一种无标签的技术,用于3D折射率 (RI) 和吸收映射.
    • 传统的IDT需要广泛的测量,限制成像速度并导致运动工件.
    • 在IDT中的连贯成像模型需要在不同的平面波照明下进行连续测量.

    研究的目的:

    • 开发一种高速,无运动的3D断层显微镜技术.
    • 克服传统强度衍射断层扫描 (IDT) 的局限性.
    • 为了能够快速成像未染色的生物样本.

    主要方法:

    • 拟议的不同相对比强度衍射断层扫描 (DPC-IDT).
    • 在IDT框架内的集成差分相对照 (DPC) 照明.
    • 使用部分连贯照明和不对称环状照明来获取数据.
    • 从仅仅四张强度图像中重建了3D RI断层图像.

    主要成果:

    • 实现了高速,无运动的3D断层显微镜.
    • 通过标准微球的RI测量成功验证了DPC-IDT.
    • 在25 Hz的体积率下展示了活体PLC细胞的动态3D成像.

    结论:

    • 与传统的IDT相比,DPC-IDT显著增加了成像速度.
    • 该技术有效用于无标签的,生物标本的高速3D成像.
    • DPC-IDT显示了活细胞成像和其他未染色样本应用的巨大潜力.