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Related Concept Videos

The Z-Scheme of Electron Transport in Photosynthesis01:34

The Z-Scheme of Electron Transport in Photosynthesis

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...
Photosystem I01:27

Photosystem I

Although structurally similar to photosystem II (PSII), photosystem I (PSI) is has a different electron supplier and electron acceptor.
Both these photosystems work in concert. An excited electron from PSII is relayed to PSI via an electron transport chain in the thylakoid membrane of the chloroplast, which is comprised of the carrier molecule plastoquinone, the dual-protein cytochrome complex, and plastocyanin. As electrons move between PSII and PSI, they lose energy and must be re-energized...
Photosystem II01:22

Photosystem II

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.
The pigment molecules are arranged across  two photosystem domains — the antenna complex and the reaction center. The main aim of the pigment molecules...
Chemiosmosis01:32

Chemiosmosis

Oxidative phosphorylation is a highly efficient process that generates large amounts of adenosine triphosphate (ATP), the basic unit of energy that drives many cellular processes. Oxidative phosphorylation involves two processes— the electron transport chain and chemiosmosis.
Electron Transport Chain
The electron transport chain involves a series of protein complexes on the inner mitochondrial membrane that undergo a series of redox reactions. At the end of this chain, the electrons reduce...
Oxygenic Photosynthesis01:26

Oxygenic Photosynthesis

Oxygenic photosynthesis is a fundamental process in which light energy is harnessed to drive the oxidation of water, leading to the production of molecular oxygen (O₂), adenosine triphosphate (ATP), and nicotinamide adenine dinucleotide phosphate (NADPH). This process is essential for sustaining aerobic life on Earth and is primarily carried out by cyanobacteria, algae, and plants. The core of oxygenic photosynthesis lies in the thylakoid membranes, where chlorophyll pigments facilitate light...
Anoxygenic Photosynthesis01:30

Anoxygenic Photosynthesis

Anoxygenic photosynthesis is a phototrophic process that captures light energy to drive carbon fixation without producing molecular oxygen. Unlike oxygenic photosynthesis, which utilizes water as an electron donor and releases oxygen, anoxygenic phototrophs use alternative electron donors such as hydrogen sulfide (H₂S), elemental sulfur (S⁰), or thiosulfate (S₂O₃²⁻). This process is carried out by diverse groups of bacteria, including purple bacteria, green sulfur bacteria, heliobacteria, and...

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Operation of Laboratory Photobioreactors with Online Growth Measurements and Customizable Light Regimes
05:21

Operation of Laboratory Photobioreactors with Online Growth Measurements and Customizable Light Regimes

Published on: October 28, 2021

Artificial photosynthesis at soft interfaces.

Delphine Schaming1, Imren Hatay, Fernando Cortez

  • 1Laboratoire d'Electrochimie Physique et Analytique, Station 6, Ecole Polytechnique Féderale de Lausanne, CH-1015 Lausanne.

Chimia
|July 13, 2011
PubMed
Summary
This summary is machine-generated.

Artificial photosynthesis utilizes a polarized liquid membrane with two photosystems to generate hydrogen and oxygen. This process involves proton-coupled electron transfer and ultrafast photosensitization steps.

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Area of Science:

  • Artificial photosynthesis
  • Membrane science
  • Photochemistry

Background:

  • Artificial photosynthesis aims to mimic natural processes for sustainable energy.
  • Developing efficient artificial systems requires understanding complex interfacial reactions.

Purpose of the Study:

  • To present a novel concept for artificial photosynthesis using a polarized liquid membrane.
  • To describe the integration of two photosystems for hydrogen and oxygen evolution.

Main Methods:

  • Conceptualization of a polarized liquid membrane system.
  • Integration of photosystems at membrane interfaces.
  • Analysis of proton-coupled electron transfer reactions.

Main Results:

  • A design for artificial photosynthesis at a polarized liquid membrane.
  • Successful integration of photosystems for distinct hydrogen and oxygen evolution.
  • Identification of proton-coupled electron transfer and ultrafast photosensitization.

Conclusions:

  • The polarized liquid membrane concept offers a new platform for artificial photosynthesis.
  • The system efficiently facilitates hydrogen and oxygen evolution through coupled electron transfer.
  • Ultrafast steps in photosensitization are crucial for system efficiency.