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Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been...
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反应性氧物种耐药超稳定超分辨率DNA框架点

Chengpin Liang1, Qingting Li1,2, Bin Chen1

  • 1State Key Laboratory of Synergistic Chem-Bio Synthesis, School of Chemistry and Chemical Engineering, New Cornerstone Science Laboratory, Frontiers Science Center for Transformative Molecules and National Center for Translational Medicine, Shanghai Jiao Tong University, Shanghai 200240, China.

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研究人员开发了抗光漂白的DNA框架 (SDF) 点,模仿天然的绿色光蛋白 (GFP). 这些超稳定的SDF点可提高光体的光稳定性,用于高级超高分辨率成像应用.

关键词:
基因结构 DNA 基因结构 DNA 基因结构光灯条形码 光灯条形码反应性氧物种的耐药性反应性氧物种的耐药性超高分辨率成像成像技术超级摄影稳定性 超级摄影稳定性

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科学领域:

  • 生物物理学和生物医学研究.
  • 材料科学是一种材料科学.
  • 纳米技术纳米技术

背景情况:

  • 在自然和人工系统中的纳米限制调节了分子特性,用于各种应用.
  • 绿色光蛋白 (GFP) 使用基架通过限制进行染色体稳定.
  • 开发用于受控分子限制的人工系统对于先进的光学应用至关重要.

研究的目的:

  • 为了设计耐光漂白的超分辨率DNA框架 (SDF) 点,用于可编程的光体封闭,灵感来自GFP.
  • 为了提高光体的光稳定性,并使先进的超分辨率显微镜技术成为可能.
  • 为开发超稳定的光探针创建一个多功能平台.

主要方法:

  • 开发的DNA框架 (SDF) 点与一个内部空腔用于光体封装.
  • 对反应性氧物种的光漂白抗性的评估.
  • 通过在SDF点内使用不同的光标签策略来量化光稳定性增强.
  • 在超分辨率成像技术中应用SDF点,如刺激辐射消耗 (STED) 和结构化照明显微镜 (SIM).

主要成果:

  • 由于DNA框架屏蔽,SDF点对反应性氧物种诱导的光漂白具有显著的抵抗力.
  • 在SDF点内光封装导致光稳定性提高了多达1.8倍和50倍,相比于分别在DNA上进行角标签和单一标签.
  • 实现了活细胞膜的成功STED成像,持续超过30分钟.
  • 开发超稳定的超分辨率SIM条形码,能够区分18种颜色,空间分辨率为70nm.

结论:

  • SDF点为设计超稳定的光探针提供了强大而适应性的平台.
  • 开发的纳米封闭策略显著提高了用于超高分辨率成像的光光稳定性.
  • 这种方法为促进生物物理学和生物医学研究中的单粒子跟踪和成像提供了一种多功能工具.