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The normal cardiac rhythm is a synchronized electrical activity that facilitates the regular and coordinated contraction of the heart muscle. This process is essential for efficient blood circulation throughout the body. The fundamental elements involved in establishing and maintaining this rhythm include the unique electrical properties of cardiac muscle cells, the sinoatrial (SA) node's pacemaker function, the specialized conducting system, and the ionic mechanisms underlying each phase...
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在单个活细胞内感知电阻脉冲

Rongrong Pan1,2, Keke Hu1,3, Rui Jia1,3

  • 1Department of Chemistry and Biochemistry, Queens College-CUNY, Flushing, New York 11367, United States.

Journal of the American Chemical Society
|March 3, 2020
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概括

研究人员开发了局部电阻脉冲传感器来检测活细胞中的纳米生物实体. 这种技术使得细胞囊泡和纳米颗粒的现场分析成为可能,从而提升了细胞内传感能力.

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科学领域:

  • 生物物理
  • 纳米技术
  • 细胞生物学

背景情况:

  • 电阻脉冲传感器可以检测散装溶液中的纳米级实体.
  • 之前没有报告活细胞内的局部感应.
  • 这项技术对于了解细胞过程和疾病机制至关重要.

研究的目的:

  • 在活细胞中开发和演示局部电阻脉冲传感.
  • 检测和描述细胞内囊泡和纳米粒子.
  • 在单个囊中进行反应性物种的电化学分析.

主要方法:

  • 用纳米管作为扫描离子导电显微镜 (SICM) 尖端进行电阻脉冲实验.
  • 通过特征性的离子电流变化监测细胞膜透.
  • 在现场检测巨细胞中的细胞囊和纳米颗粒.
  • 使用导电碳纳米管进行电化学电阻脉冲实验.

主要成果:

  • 在RAW 264.7巨细胞内成功检测出细胞囊泡 (体,溶体,体).
  • 在巨细胞质中实现了10纳米金纳米颗粒的选择性检测.
  • 从转移的人类乳腺细胞中检测出细胞外囊 (MDA-MB-231).
  • 在单个囊中测量了反应性氧和物种 (ROS/RNS).

结论:

  • 局部电阻脉冲传感可用于细胞内和现场分析.
  • 这种方法可以在它们的原生细胞环境中检测和描述纳米生物实体.
  • 这种技术有助于先进的诊断和了解细胞功能和疾病.