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Mapping Absolute DNA Density in Cell Nuclei using Single-molecule Localization Microscopy
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在衍射极限以下的折射率映射通过单分子定位显微镜进行映射.

Simon Jaritz1, Lukas Velas1, Anna Gaugutz1

  • 1Institute of Applied Physics, TU Wien, 1060 Vienna, Austria.

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概括
此摘要是机器生成的。

结合单分子定位显微镜 (SMLM) 和原子力显微镜 (AFM),可以在生物样本中绘制折射率的亚衍射映射. 这揭示了单个原纤维的结构异质性,为它们的水分和分子组织提供了洞察力.

关键词:
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科学领域:

  • 生物物理学的生物物理.
  • 显微镜的使用方法
  • 材料科学 材料科学 材料科学

背景情况:

  • 单分子定位显微镜 (SMLM) 在射极限以下的3D图像生物样本.
  • 在SMLM中,点差函数的形状提供了关于样本折射性能的数据.
  • 原子力显微镜 (AFM) 提供了高分辨率的表面地形.

研究的目的:

  • 开发和演示一种结合SMLM和AFM的方法,用于分衍射折射率映射.
  • 为了研究单个原纤维的折射率和水分.
  • 揭示原纤维中的纳米级结构异质性.

主要方法:

  • 集成SMLM和AFM用于相关成像.
  • 使用SMLM的点差函数分析来确定折射率.
  • 应用AFM对生物样本进行精确的地形测量.

主要成果:

  • 在生物样本中的折射率在亚衍射分辨率下成功映射.
  • 确定单个原纤维的折射率变化和胀行为.
  • 识别沿着原纤维的折射率的纳米尺度波动,表明结构异质性.

结论:

  • 结合的SMLM-AFM方法精确地绘制了纳米尺度上的折射率.
  • 单一的原纤维呈现异质的折射率和差异性水分.
  • 这种方法在分子层面上揭示了原纤维中的结构变异.