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Related Concept Videos

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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...
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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...
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Microorganisms exhibit diverse oxygen requirements and growth patterns driven by their metabolic strategies and environmental adaptations. Oxygen, while essential for many organisms, can also be toxic under certain conditions, shaping how microorganisms grow and survive.Oxygen Requirements of MicroorganismsMicroorganisms are classified based on their ability to use or tolerate oxygen:● Obligate aerobes like Mycobacterium tuberculosis need oxygen for energy production, as it serves as the...
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Radicals adjacent to electron-donating groups are called nucleophilic radicals. These radicals readily react with electrophilic alkenes. The SOMO–LUMO interactions are the driving force for the reaction, where the high-energy SOMO of the electron-rich, nucleophilic radicals interacts with the low-energy LUMO of the electron-deficient, electrophilic alkenes. Such SOMO–LUMO interactions are the basis of reactive radical traps, affecting the selectivity in radical reactions. For...
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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 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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Reactive Oxygen Species: Beyond Their Reactive Behavior.

Arnaud Tauffenberger1, Pierre J Magistretti2

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Neurochemical Research
|January 13, 2021
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Reactive oxygen species (ROS) are crucial for cell signaling in aging and brain diseases. This review explores their dual role in cellular dysfunction and vital signaling pathways, impacting neurological health.

Keywords:
HomeostasisHormesisROSReactive species

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Area of Science:

  • Cellular Biology
  • Neuroscience
  • Biochemistry

Background:

  • Cellular homeostasis is vital for organismal development and aging; its disruption leads to disease.
  • Reactive oxygen species (ROS), initially viewed as cellular by-products, are implicated in aging and neurological disorders like Alzheimer's and Parkinson's disease.
  • ROS exhibit high reactivity, damaging proteins, lipids, and DNA, contributing to cellular dysfunction.

Purpose of the Study:

  • To review the multifaceted roles of reactive oxygen species (ROS) in cellular signaling.
  • To examine the involvement of ROS in the aging process and neurodegenerative diseases.
  • To elucidate the balance between ROS's detrimental and beneficial functions in the brain.

Main Methods:

  • Literature review of existing research on ROS.
  • Analysis of ROS involvement in cellular signaling pathways.
  • Synthesis of data on ROS in brain aging and neurodegeneration.

Main Results:

  • ROS function extends beyond cellular damage, acting as critical second messengers in signaling cascades.
  • ROS significantly influence cell development, proliferation, and survival.
  • In the brain, ROS impact neuronal and astrocyte function, affecting synaptic plasticity and neuron survival.

Conclusions:

  • ROS play a complex role in cellular signaling, impacting both health and disease.
  • Understanding ROS signaling is crucial for addressing brain aging and neurodegeneration.
  • Maintaining the delicate balance of ROS is key to preventing neurological disorders.