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相关概念视频

X-ray Diffraction of Biological Samples01:10

X-ray Diffraction of Biological Samples

3.8K
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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相关实验视频

Updated: Jun 12, 2025

Automated 3D Optical Coherence Tomography to Elucidate Biofilm Morphogenesis Over Large Spatial Scales
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超宽带光学衍射断层断层扫描仪

Martin Hörmann1, Franco V A Camargo2, Niek F van Hulst3,4

  • 1Dipartimento di Fisica, Politecnico di Milano, Piazza L. da Vinci 32, Milano 20133, Italy.

ACS photonics
|September 23, 2024
PubMed
概括
此摘要是机器生成的。

我们开发了用于3D成像的超宽带光学衍射断层扫描 (ODT). 这项技术实现了150nm分辨率,并测量了宽带折射率变化,从而能够在细胞中精确识别纳米粒子.

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科学领域:

  • 生物物理学的生物物理.
  • 光学成像技术的成像
  • 频谱学是一种光谱学.

背景情况:

  • 光衍射断层扫描 (ODT) 是一种有价值的3D成像方法.
  • 将ODT与宽带光源集成,带来了重大的实验挑战.
  • 在3D样本中测量宽带折射率变化是当前技术很困难的.

研究的目的:

  • 引入超宽带ODT (UB-ODT) 进行增强的3D成像.
  • 为了能够测量样本中的宽带折射率变化.
  • 为了实现高度的横向空间分辨率,进行详细的细胞分析.

主要方法:

  • 利用基于脉冲成形的里埃变换光谱学.
  • 开发了一种具有超过150 nm可见光谱带宽的ODT系统.
  • 在生物样本上应用光谱分辨率成像.

主要成果:

  • 实现了150nm的横向空间分辨率.
  • 获得了HeLa细胞的宽带,光谱分辨率ODT图像.
  • 通过使用光谱数据,在细胞结构内的纳米颗粒进行了精确的3D识别.

结论:

  • UB-ODT克服了传统ODT在宽带分析方面的局限性.
  • 该技术可以在3D中详细描述折射率.
  • 这一进步对生命科学和材料科学研究产生了重大影响.