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相关概念视频

Bridge rectifier01:24

Bridge rectifier

598
The bridge rectifier is essential in electronics for efficiently converting alternating current (AC) to direct current (DC). Comprised of four diodes configured in a bridge layout, this rectifier effectively processes both the positive and negative halves of the AC waveform, making it superior to half-wave and full-wave center-tapped rectifiers in terms of voltage regulation and output stability.
Operationally, the bridge rectifier allows current flow through two of its diodes during each...
598
Line Protection with Impedance Relays01:27

Line Protection with Impedance Relays

79
Coordinating time-delay overcurrent relays in complex radial systems and directional overcurrent relays in multi-source transmission loops can be challenging. Impedance relays address these issues by responding to the voltage-to-current ratio, specifically measuring the apparent impedance of a line. These relays become more sensitive during faults as current increases and voltage decreases, thereby reducing the apparent impedance.
Under normal conditions, low load currents keep the measured...
79
Biasing of P-N Junction01:16

Biasing of P-N Junction

525
The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
525
Diode: Forward bias01:20

Diode: Forward bias

1.0K
In semiconductor devices, diodes play a crucial role in directing current flow, and its operation is primarily categorized into forward bias and reverse bias. A diode is said to be forward-biased when its p-type region is connected to the positive terminal of a battery and its n-type region is linked to the negative terminal. This configuration reduces the potential barrier within the diode, allowing current to flow easily from the p to the n-type region.
The behavior of a diode in forward bias...
1.0K
Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

Design Example: Strain Gauge Bridge or Wheatstone Bridge

398
The utilization of strain gauges as transducers for converting mechanical strain into electrical signals is a common practice in various engineering applications. These strain gauges are frequently integrated into Wheatstone bridge circuits to accurately measure parameters such as force or pressure. Within this context, each element within the circuit exhibits a resistance that undergoes subtle variations when subjected to mechanical strain. The primary objective is to convert minuscule...
398
Controlled-Current Coulometry: Overview01:27

Controlled-Current Coulometry: Overview

201
Controlled current coulometry, also known as amperostatic coulometry, is a technique used in electrochemical analysis to measure the quantity of a substance through the controlled passage of current. It involves the application of a constant current to an electrochemical cell containing the analyte of interest. As the current flows through the cell, the analyte undergoes a redox reaction at the electrode surface, resulting in a charge transfer. By monitoring the time required for a certain...
201

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相关实验视频

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Sensing of Barrier Tissue Disruption with an Organic Electrochemical Transistor
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桥梁离子电流校正和电阻脉冲传感可用于可靠的宽线性检测.

Xian Zhang1, Zeng-Qiang Wu2, You-Wei Zheng1

  • 1State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China.

Analytical chemistry
|April 10, 2024
PubMed
概括

这项研究引入了一种新的纳米孔传感方法,将离子电流校正 (ICR) 和电阻脉冲传感 (RPS) 结合起来,用于可靠的miRNA检测. 该技术实现了从1 fM到1 nM的广泛线性检测范围,即使在复杂的生物样本中也是如此.

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Measurement of Bioelectric Current with a Vibrating Probe
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科学领域:

  • 纳米孔感应 纳米孔感应
  • 生物分子检测检测
  • 分析化学是一种分析化学.

背景情况:

  • 离子电流纠正 (ICR) 由于信号波动,在痕迹检测方面存在局限性.
  • 电阻脉冲传感 (RPS) 在高度样本中面临着孔隙堵塞的挑战.
  • 需要一种统一的纳米孔探测方法来克服单个技术的局限性.

研究的目的:

  • 开发一个双模纳米孔探测战略,整合ICR和RPS.
  • 为了实现微RNA (miRNA) 的可靠和灵敏的检测,具有广泛的线性范围.
  • 克服ICR中微量水平波动和RPS中高度堵塞的局限性.

主要方法:

  • 纳米孔大小与DNA四面体 (TDN) 结构的合理匹配.
  • 利用miRNA-10b的TDN的特定结合和释放来调节纳米孔信号.
  • 同时测量由分析物-TDN相互作用引起的不同的ICR和RPS信号.

主要成果:

  • 实现了miRNA-10b从1 fM到1 nM的广泛线性检测范围.
  • 证明了与孔状几何形状和表面电荷调制相关的独特ICR信号.
  • 通过纳米孔通过miRNA-10b-TDN复合体产生的观察到的RPS信号.
  • 在单细胞和真实血样本中验证了该方法的可行性.

结论:

  • 集成ICR和RPS纳米孔传感方法提供了增强的可靠性和线性.
  • 这种方法有效地解决了传统ICR和RPS技术的局限性.
  • 开发的生物传感器在复杂的生物环境中显示出敏感miRNA检测的前景.