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Related Concept Videos

Redox Equilibria: Overview01:23

Redox Equilibria: Overview

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A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
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Ladder Diagrams: Redox Equilibria01:30

Ladder Diagrams: Redox Equilibria

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Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...
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Cell Potential and Free Energy02:58

Cell Potential and Free Energy

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Thermodynamics of a Redox Reaction
Thermodynamics is the branch of physics dealing with the relationship between heat and other forms of energy. In an electrochemical cell, chemical energy is converted into electrical energy.
Thus, a link can be predicted between cell potential, free energy change, and the equilibrium constant for the reaction. Cell potential can also be measured as the oxidant or the reducing strength, and similar acid-base strength measures are reflected in equilibrium...
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Standard Electrode Potentials03:02

Standard Electrode Potentials

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On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
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Redox Reactions01:24

Redox Reactions

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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Redox Reactions01:27

Redox Reactions

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Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
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EPR Monitored Redox Titration of the Cofactors of Saccharomyces cerevisiae Nar1
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The Redox Code.

Dean P Jones1, Helmut Sies2,3

  • 11 Department of Medicine, Emory University , Atlanta, Georgia .

Antioxidants & Redox Signaling
|April 21, 2015
PubMed
Summary
This summary is machine-generated.

The redox code organizes biological systems through redox signaling, crucial for life. Disruptions in this code, especially during oxidative stress, are fundamental to disease development.

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Area of Science:

  • Biochemistry
  • Cellular Biology
  • Systems Biology

Background:

  • Advances in methodology allow assessment of redox code components under physiological conditions.
  • This enables insights into spatiotemporal organization and identification of redox partners via redox proteomics and metabolomics.

Purpose of the Study:

  • To elucidate the principles of the redox code.
  • To understand its role in biological systems' spatiotemporal organization.
  • To explore its implications in health and disease.

Main Methods:

  • Assessment of redox code components under physiological conditions.
  • Redox proteomics and metabolomics for partner identification.
  • Analysis of spatiotemporal organization in biological systems.

Main Results:

  • The redox code principles define the spatial and temporal positioning of redox systems like NAD(P) and thiols.
  • Oxygen-dependent life utilizes redox cycles (O₂, H₂O₂) for organization in differentiation, development, and adaptation.
  • Disruption of the redox code structure during oxidative stress is a key mechanism in system failure and disease.

Conclusions:

  • Detailed knowledge of redox code molecular patterns under physiological/pathological conditions is vital for understanding redox roles in health and disease.
  • This knowledge will form the scientific basis for a modern redox medicine.