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Related Concept Videos

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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Potentiometry: Membrane Electrodes01:15

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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
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Potentiometry is an analytical technique that measures the potential difference between two electrodes in an electrochemical cell without drawing any significant current that could alter the solution's composition. This method employs an indicator electrode, which exchanges electrons with the analyte solution, and a reference electrode with a constant potential. Each electrode is immersed in a solution comprised of two half-cells. In a conventional setup, the reference electrode serves as...
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Amperometry: Overview01:10

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Amperometry is a technique commonly used to measure the concentration of specific analytes in a solution by monitoring the electric current generated during an electrochemical reaction. It involves applying a constant potential between a working electrode and a reference electrode to measure the resulting current, which is proportional to the concentration of the analyte. The Clark oxygen electrode operates based on this principle of amperometry. It consists of a cathode and an anode enclosed...
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Controlled-Potential Coulometry: Electrolytic Methods01:17

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Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
The chosen potential...
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Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
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CurrentView: a tool for visualization and comparison of nanopore ionic current signals.

Pooria Daneshvar Kakhaki1, Neda Ghohabi Esfahani2, Stuart Akeson2

  • 1Department of Electrical & Computer Engineering, Northeastern University, 360 Huntington Ave, Boston, MA 02115, United States.

Bioinformatics (Oxford, England)
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Summary

CurrentView visualizes nanopore sequencing ionic current signals, enabling direct analysis of DNA/RNA sequences and modifications. This open-source toolkit facilitates rapid comparison across multiple experimental conditions for deeper biological insights.

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Area of Science:

  • Genomics
  • Bioinformatics
  • Molecular Biology

Background:

  • Nanopore sequencing generates ionic current data as DNA/RNA passes through a pore.
  • Oxford Nanopore Technologies' Dorado basecaller infers sequence and modifications from this data.
  • Move-table data links ionic current signals to basecalled sequences.

Purpose of the Study:

  • To introduce CurrentView, a toolkit for visualizing nanopore ionic current signals.
  • To enable reference-guided analysis of ionic current traces.
  • To facilitate comparison across multiple experimental conditions.

Main Methods:

  • CurrentView utilizes sequence alignment and move-table data from BAM files.
  • It extracts and visualizes ionic current traces from ONT POD5 files.
  • The toolkit supports UMAP dimensionality reduction and GMM clustering for signal analysis.

Main Results:

  • CurrentView provides a user-friendly interface for inspecting ionic current patterns.
  • It enables simultaneous comparison of multiple experimental conditions.
  • The toolkit aids in identifying distinct signal populations and analyzing sequence context.

Conclusions:

  • CurrentView is a fast and user-friendly toolkit for visualizing nanopore ionic current data.
  • It supports advanced analysis techniques like UMAP and GMM clustering.
  • The open-source toolkit is available as a Python API and web application for broad accessibility.