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Peroxisomes01:24

Peroxisomes

Peroxisomes are specialized organelles present in fungi, plant, and animal cells. It can vary in number, size, morphology, and activity depending on the type of tissue and the nutritional state of the cell. For example, cells with active lipid metabolism, such as adipocytes, neurons, and hepatocytes, have more peroxisomes than other cells in the body. Besides their primary role in breaking down complex organic molecules, peroxisomes can also synthesize specific macromolecules and participate in...
Radical Reactivity: Overview01:11

Radical Reactivity: Overview

Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired molecule. These three...
Radical Autoxidation01:20

Radical Autoxidation

The oxidation of an organic compound in the presence of air or oxygen is called autoxidation. For example, cumene reacts with oxygen to form hydroperoxide. Autoxidation involves initiation, propagation, and termination steps. Many organic compounds are susceptible to autoxidation—especially ethers in the presence of oxygen, which form hydroperoxides. Even though this reaction is slow, old ether bottles contain small amounts of peroxide, which leads to laboratory explosions during ether...
Bioactivation and Tissue Toxicity01:25

Bioactivation and Tissue Toxicity

Bioactivation is a metabolic process that transforms less reactive substances into highly reactive metabolites, initiating tissue toxicity. This transformation can lead to various toxic effects, including carcinogenesis and teratogenesis. Reactive metabolites are classified into two main types: electrophiles and free radicals.Electrophiles are electron-deficient species and are produced primarily by the enzyme cytochrome P-450 during the metabolism of compounds containing carbon, nitrogen, or...
Oxygen Requirements and Growth Patterns01:29

Oxygen Requirements and Growth Patterns

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Related Experiment Video

Updated: Jul 10, 2026

Production and Detection of Reactive Oxygen Species (ROS) in Cancers
07:17

Production and Detection of Reactive Oxygen Species (ROS) in Cancers

Published on: November 21, 2011

Oxygen radicals and human disease.

C E Cross, B Halliwell, E T Borish

    Annals of Internal Medicine
    |October 1, 1987
    PubMed
    Summary

    Toxic oxygen free radicals contribute to various diseases. Research into their chemistry, antioxidants, and roles in conditions like cancer and aging may lead to new therapies.

    Area of Science:

    • Biochemistry
    • Pathology
    • Toxicology

    Background:

    • Toxic oxygen free radicals are implicated as key mediators in numerous clinical disorders.
    • Understanding the chemical processes of radical production is crucial for disease research.

    Purpose of the Study:

    • To review the chemistry of oxygen radical production.
    • To discuss the roles of iron and antioxidants in relation to free radicals.
    • To highlight diseases actively researched in the context of oxy-radical pathology.

    Main Methods:

    • Literature review focusing on oxygen free radical chemistry.
    • Analysis of the involvement of iron and antioxidants.
    • Examination of specific disease contexts including cigarette smoke, ischemia-reperfusion, carcinogenesis, and aging.

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    Stimulation of Stem Cell Niches and Tissue Regeneration in Mouse Skin by Switchable Protoporphyrin IX-Dependent Photogeneration of Reactive Oxygen Species In Situ

    Published on: May 8, 2020

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    Last Updated: Jul 10, 2026

    Production and Detection of Reactive Oxygen Species (ROS) in Cancers
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    Published on: November 21, 2011

    Analysis of Oxidative Stress in Zebrafish Embryos
    11:05

    Analysis of Oxidative Stress in Zebrafish Embryos

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    Stimulation of Stem Cell Niches and Tissue Regeneration in Mouse Skin by Switchable Protoporphyrin IX-Dependent Photogeneration of Reactive Oxygen Species In Situ
    10:05

    Stimulation of Stem Cell Niches and Tissue Regeneration in Mouse Skin by Switchable Protoporphyrin IX-Dependent Photogeneration of Reactive Oxygen Species In Situ

    Published on: May 8, 2020

    Main Results:

    • Oxygen free radicals play a significant role in the pathophysiology of various diseases.
    • Cigarette smoke, ischemia-reperfusion injury, carcinogenesis, and aging are key areas of oxy-radical research.
    • Iron and antioxidants are critical components in the balance of radical production and mitigation.

    Conclusions:

    • Further research into oxygen free radicals and related mechanisms provides a basis for developing novel therapeutic strategies.
    • Understanding free radical chemistry is essential for addressing diseases linked to oxidative stress.
    • Targeting free radical pathways holds promise for future medical breakthroughs.