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Related Concept Videos

Biasing of P-N Junction01:16

Biasing of P-N Junction

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...
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
Diode: Reverse bias01:14

Diode: Reverse bias

A diode is reverse-biased when the positive terminal of an external voltage source is connected to the n-type material and the negative terminal to the p-type material. This configuration opposes the natural direction of current flow through the diode, effectively increasing the width of the depletion region and the barrier potential. The reverse bias condition produces a minimal leakage current, primarily due to minority charge carriers. This leakage becomes significant when the reverse...
Junction Potentials in Galvanic Cells01:21

Junction Potentials in Galvanic Cells

The Nernst equation, derived under the assumption of thermodynamic equilibrium, calculates the electromotive force (emf) as the sum of potential differences at phase boundaries in a reversible cell without a liquid junction. However, in irreversible cells such as the Daniell cell, an additional potential difference named the liquid-junction potential (EJ) arises across the interface of two electrolyte solutions due to different ion diffusion rates. This EJ represents the potential difference...
Bridge rectifier01:24

Bridge rectifier

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...
Induced Electric Dipoles01:28

Induced Electric Dipoles

A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...

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Related Experiment Video

Updated: Jun 13, 2026

Electrochemical Etching and Characterization of Sharp Field Emission Points for Electron Impact Ionization
06:58

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Published on: July 12, 2016

Inverted Potentials Enhance Electron Bifurcation Efficiency Prior to Steady State.

Kiriko Terai1,2, Abigail S Hjelmstad1,3, David N Beratan1,4,5

  • 1Department of Chemistry, Duke University, Durham, North Carolina 27708, United States.

The Journal of Physical Chemistry Letters
|June 12, 2026
PubMed
Summary
This summary is machine-generated.

Electron bifurcation networks use inverted potentials to prevent energy loss during rapid metabolic state changes. This finding highlights the energetic advantage of inverted potentials in non-steady-state biological systems.

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Last Updated: Jun 13, 2026

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Published on: January 19, 2018

Area of Science:

  • Biochemistry
  • Bioenergetics
  • Metabolic Networks

Background:

  • Electron bifurcation networks are crucial for splitting electron pairs efficiently.
  • Bifurcating enzymes often utilize cofactors with inverted reduction potentials, but their advantage is unclear.
  • Previous models using generic landscapes showed both normal and inverted potentials support steady-state bifurcation.

Purpose of the Study:

  • To investigate the impact of potential inversion on the kinetics of steady-state and pre-steady-state bifurcation and confurcation.
  • To model redox substrates as finite pools, reflecting biological system limitations.

Main Methods:

  • Computational modeling of redox substrates as finite pools.
  • Analysis of steady-state and pre-steady-state bifurcation and confurcation kinetics under different potential conditions.

Main Results:

  • Both normal and inverted potentials support efficient steady-state bifurcation and confurcation.
  • Inverted potentials uniquely suppress short-circuiting and reduce energy dissipation in the pre-steady-state regime.
  • This energetic advantage is observed when the network is initiated in an electron-depleted state.

Conclusions:

  • Inverted potentials offer a significant energetic advantage during frequent metabolic state transitions (bifurcation/confurcation) where steady state is not maintained.
  • The findings suggest a functional role for inverted potentials in dynamic biological systems.