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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.
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...
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Photosystem II01:22

Photosystem II

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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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Oxygenic Photosynthesis01:26

Oxygenic Photosynthesis

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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...
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The Z-Scheme of Electron Transport in Photosynthesis01:34

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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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Photosystems01:32

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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.
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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...
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Related Experiment Video

Updated: Apr 11, 2026

Purification of Active Photosystem I-Light Harvesting Complex I from Plant Tissues
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Plasmon-induced artificial photosynthesis.

Kosei Ueno1, Tomoya Oshikiri1, Xu Shi1

  • 1Research Institute for Electronic Science , Hokkaido University , N21, W10, Kita-ku, Sapporo, 001-0021 Hokkaido , Japan.

Interface Focus
|June 9, 2015
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel artificial photosynthesis system using gold nanoparticles on strontium titanate to produce hydrogen and ammonia. This innovative approach utilizes both sides of the substrate without external electrochemical devices, enhancing energy conversion efficiency.

Keywords:
artificial photosynthesisphotochemistryplasmonic chemistry

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Area of Science:

  • Materials Science
  • Photochemistry
  • Nanotechnology

Background:

  • Artificial photosynthesis aims to convert solar energy into chemical energy.
  • Developing efficient and cost-effective artificial photosynthesis systems remains a challenge.
  • Utilizing plasmonic effects in nanomaterials offers a promising route for enhanced photocatalysis.

Purpose of the Study:

  • To develop a plasmon-induced artificial photosynthesis system for producing hydrogen and ammonia.
  • To investigate the use of a gold nanoparticle-loaded oxide semiconductor electrode for enhanced photocatalysis.
  • To explore the dual-sided utilization of a strontium titanate single-crystal substrate without an electrochemical apparatus.

Main Methods:

  • Fabrication of a gold nanoparticle-loaded strontium titanate electrode.
  • Plasmon-induced water splitting and ammonia synthesis experiments.
  • Photocurrent measurements and spectroelectrochemical analysis to understand electron transfer and reaction mechanisms.

Main Results:

  • Successful production of hydrogen and ammonia using the developed system.
  • Demonstration of efficient water splitting with a low chemical bias (0.23 V) due to plasmonic effects.
  • Elucidation of electron transfer dynamics between gold nanoparticles and the semiconductor via photocurrent measurements.
  • Successful ammonia synthesis via nitrogen fixation using ruthenium as a co-catalyst.

Conclusions:

  • The developed plasmon-induced artificial photosynthesis system is effective for producing valuable chemical energy carriers.
  • The dual-sided utilization of the strontium titanate substrate and plasmonic effects significantly enhance photocatalytic efficiency.
  • This work provides a foundation for advanced nanomaterial-based artificial photosynthesis systems.