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Related Concept Videos

Redox Reactions01:27

Redox Reactions

1.4K
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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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 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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Oxidation and Reduction of Organic Molecules01:19

Oxidation and Reduction of Organic Molecules

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Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
The removal of an electron from a molecule, results in a...
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Balancing Redox Equations02:58

Balancing Redox Equations

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Electrochemistry is the science involved in the interconversion of electrical and chemical reactions. Such reactions are called reduction-oxidation, or redox reactions. These important reactions are defined by changes in oxidation states for one or more reactant elements and include a subset of reactions involving the transfer of electrons between reactant species. Electrochemistry as a field has evolved to yield sufficient insights on the fundamental principles of redox chemistry and multiple...
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Redox Titration: Other Oxidizing and Reducing Agents01:26

Redox Titration: Other Oxidizing and Reducing Agents

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Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...
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Related Experiment Video

Updated: Apr 20, 2026

Defining Hsp33's Redox-regulated Chaperone Activity and Mapping Conformational Changes on Hsp33 Using Hydrogen-deuterium Exchange Mass Spectrometry
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Defining Hsp33's Redox-regulated Chaperone Activity and Mapping Conformational Changes on Hsp33 Using Hydrogen-deuterium Exchange Mass Spectrometry

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[Exercise and redox signaling regulation].

Jing Liu, Jian-Gang Long, Jian-Kang Liu

    Sheng Li Ke Xue Jin Zhan [Progress in Physiology]
    |December 2, 2014
    PubMed
    Summary

    Exercise and mitochondria impact reactive oxygen species (ROS) levels. Moderate exercise benefits health by managing ROS, while intense exercise can cause fatigue and injury. Mitochondrial nutrients help mitigate these negative effects.

    Area of Science:

    • Physiology
    • Biochemistry
    • Exercise Science

    Background:

    • Reactive oxygen species (ROS) are crucial signaling molecules for maintaining redox homeostasis.
    • Physiological ROS from appropriate exercise enhance antioxidant capacity, performance, and metabolism, while retarding aging.
    • Excess ROS from overload exercise leads to fatigue and injury, with mitochondria being the primary ROS producers.

    Purpose of the Study:

    • To investigate the role of mitochondria and mitochondrial nutrients in modulating ROS.
    • To understand how exercise intensity affects ROS production and its consequences.
    • To explore the potential of mitochondrial nutrients in mitigating exercise-induced oxidative stress and fatigue.

    Main Methods:

    • Analysis of ROS production in relation to exercise intensity.

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  • Assessment of mitochondrial function and redox homeostasis.
  • Evaluation of the effects of mitochondrial nutrients on exercise performance and oxidative stress markers.

    • Main Results:

    • Appropriate exercise generates physiological ROS, improving performance and metabolism.
    • Overload exercise induces excess ROS, causing fatigue and injury.
    • Mitochondrial nutrients were found to maintain redox homeostasis and ameliorate exercise-induced oxidative stress and fatigue.

    Conclusions:

    • Mitochondria play a central role in cellular redox balance.
    • Mitochondrial nutrients can counteract the detrimental effects of excessive ROS during strenuous exercise.
    • Targeting mitochondrial function with nutrients offers a strategy to improve exercise performance and prevent injury.