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Related Concept Videos

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...
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Line Protection with Impedance Relays01:27

Line Protection with Impedance Relays

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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...
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Biasing of P-N Junction01:16

Biasing of P-N Junction

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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...
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Diode: Forward bias01:20

Diode: Forward bias

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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...
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Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

Design Example: Strain Gauge Bridge or Wheatstone Bridge

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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...
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Controlled-Current Coulometry: Overview01:27

Controlled-Current Coulometry: Overview

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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...
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Related Experiment Video

Updated: Jun 28, 2025

Sensing of Barrier Tissue Disruption with an Organic Electrochemical Transistor
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Bridging Ionic Current Rectification and Resistive-Pulse Sensing for Reliable Wide-Linearity Detection.

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
Summary
This summary is machine-generated.

This study introduces a novel nanopore sensing method combining ionic current rectification (ICR) and resistive-pulse sensing (RPS) for reliable miRNA detection. The technique achieves a wide linear detection range from 1 fM to 1 nM, even in complex biological samples.

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Area of Science:

  • Nanopore sensing
  • Biomolecular detection
  • Analytical chemistry

Background:

  • Ionic current rectification (ICR) has limitations in trace detection due to signal fluctuations.
  • Resistive-pulse sensing (RPS) faces challenges with pore clogging in high-concentration samples.
  • There is a need for a unified nanopore sensing approach overcoming limitations of individual techniques.

Purpose of the Study:

  • To develop a dual-mode nanopore sensing strategy integrating ICR and RPS.
  • To achieve reliable and sensitive detection of microRNA (miRNA) with a broad linear range.
  • To overcome the limitations of trace-level fluctuations in ICR and high-concentration clogging in RPS.

Main Methods:

  • Rational matching of nanopore size with DNA tetrahedron (TDN) structures.
  • Utilizing miRNA-10b's specific binding and release of TDN to modulate nanopore signals.
  • Simultaneous measurement of distinct ICR and RPS signals induced by the analyte-TDN interaction.

Main Results:

  • Achieved a wide linear detection range for miRNA-10b from 1 fM to 1 nM.
  • Demonstrated distinct ICR signals attributed to pore geometry and surface charge modulation.
  • Observed RPS signals generated by the passage of miRNA-10b-TDN complexes through the nanopore.
  • Validated the method's feasibility in single-cell and real plasma samples.

Conclusions:

  • The integrated ICR and RPS nanopore sensing approach offers enhanced reliability and linearity.
  • This method effectively addresses the limitations of conventional ICR and RPS techniques.
  • The developed biosensor shows promise for sensitive miRNA detection in complex biological environments.