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The Z-Scheme of Electron Transport in Photosynthesis01:34

The Z-Scheme of Electron Transport in Photosynthesis

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The light reactions of photosynthesis assume a linear flow of electrons from water to NADP+. During this process, light energy drives the splitting of water molecules to produce oxygen. However, oxidation of water molecules is a thermodynamically unfavorable reaction and requires a strong oxidizing agent. This is accomplished by the first product of light reactions: oxidized P680 (or P680+), the most powerful oxidizing agent known in biology. The oxidized P680 that acquires an electron from the...
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Photosystem II01:22

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The multi-protein complex photosystem II (PS II) harvests photons and transfers their energy through its bound pigments to its reaction center, and ultimately to photosystem I (PSI) through the electron transport chain. The pigments responsible for caputirng the light energy in photosystems include chlorophyll a, chlorophyll b, and carotenoids.
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Photosystems01:32

Photosystems

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Photosystems are multiprotein complexes that form the functional units of photosynthesis in plants, algae, and cyanobacteria. They are found embedded in the membrane of tiny sac-like structures called thylakoids placed inside the chloroplast.
Functioning of Photosystems
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Radical Autoxidation01:20

Radical Autoxidation

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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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Photosystem I01:27

Photosystem I

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Although structurally similar to photosystem II (PSII), photosystem I (PSI) is has a different electron supplier and electron acceptor.
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Limiting Reactant02:27

Limiting Reactant

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The relative amounts of reactants and products represented in a balanced chemical equation are often referred to as stoichiometric amounts. However, in reality, the reactants are not always present in the stoichiometric amounts indicated by the balanced equation.
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Updated: Jun 30, 2025

Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions
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Was H2O2 generated before oxygenic photosynthesis?

Willem H Koppenol1, Helmut Sies2

  • 1Department of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology, Zürich, Switzerland.

Redox Biology
|March 16, 2024
PubMed
Summary
This summary is machine-generated.

Hydrogen peroxide (H2O2) may accumulate in early Earth

Keywords:
ArcheanFenton reactionHydrogen peroxideHydroxyl radicalQuartzSilicate mineral

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Area of Science:

  • Geochemistry
  • Astrobiology
  • Early Earth conditions

Background:

  • The accumulation of hydrogen peroxide (H2O2) in Archean waters is debated.
  • Previous studies suggest a longer H2O2 half-life under specific conditions.
  • The role of radicals in Archean water oxidation is under scrutiny.

Purpose of the Study:

  • To evaluate the half-life of H2O2 in Archean oceans.
  • To question the proposed mechanism of water oxidation by radicals.

Main Methods:

  • Re-evaluation of existing literature on H2O2 half-life.
  • Analysis of radical chemistry in simulated Archean marine environments.

Main Results:

  • The cited evidence for a longer H2O2 half-life is not applicable to Archean ocean conditions.
  • The hypothesis that radicals oxidize water to HO• and H2O2 is questioned.

Conclusions:

  • H2O2 accumulation in Archean waters is plausible but its half-life is likely shorter than previously suggested.
  • The proposed radical-driven water oxidation mechanism requires further investigation.