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相关概念视频

Labeling DNA Probes03:31

Labeling DNA Probes

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DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
Radioisotopes, fluorophores, or small molecule binding partners like biotin or digoxigenin, are the most widely used reporter tags for labeling DNA probes. These labels can be attached to the probe DNA molecule via...
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The Visual Colorimetric Detection of Multi-nucleotide Polymorphisms on a Pneumatic Droplet Manipulation Platform
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通过 Levitated Optomechanics 来选择性检测寡核酸.

Timothy Wilson1, Owen J L Rackham2, Hendrik Ulbricht3

  • 1School of Ocean and Earth Science, University of Southampton, Waterfront Campus, European Way, Southampton SO14 3ZH, United Kingdom.

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概括

这项研究证明了使用光学机械学检测寡核酸信号. 用DNA序列功能化的纳米颗粒显示出明显的运动模式,从而实现了敏感的检测.

关键词:
生物感应是一种生物感应.悬浮式光学机械 悬浮式光学机械氧核酸检测检测器光学陷的使用方法纳米颗粒 纳米粒子

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科学领域:

  • 视觉机械学 视觉机械学
  • 纳米技术纳米技术
  • 分子生物学分子生物学
  • 频谱学是一种光谱学.

背景情况:

  • 对特定DNA序列的敏感检测对于诊断和研究至关重要.
  • 光机械系统为纳米尺度现象提供了精确的测量能力.
  • 功能化纳米粒子可以使特定的分子相互作用用于检测.

研究的目的:

  • 调查使用光学机械原理来检测特定于寡核酸的信号的可行性.
  • 用特定的DNA序列来功能化二氧化纳米粒子,并在光学陷中分析它们的行为.
  • 开发和验证一种方法来区分功能化和非功能化纳米粒子.

主要方法:

  • 纳米颗粒用25-mer单链脱氧腺和脱氧胺单酸盐功能化.
  • 功能化纳米粒子被光学捕获,使用真空中的1550nm激光器.
  • 纳米粒子振荡频率和振幅通过光学干扰度检测,并使用洛伦兹曲线拟合,维度减小和随机森林建模分析.

主要成果:

  • 在功能化和非功能化纳米粒子之间观察到振荡频率,宽度和振幅的差异.
  • 光谱分析揭示了功能化纳米粒子的独特模式,由理论模型解释.
  • 减小尺寸和随机森林建模成功地区分了粒子组,尽管传输电子显微镜显示没有视觉差异.

结论:

  • 使用功能化纳米颗粒的光机械实验可以检测特定于寡核酸的信号.
  • 这种方法为区分功能化和非功能化纳米粒子提供了一种敏感的方法.
  • 开发的平台显示了对特定核酸序列的无标签检测的前景.