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Related Concept Videos

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.
The pigment molecules are arranged across  two photosystem domains — the antenna complex and the reaction center. The main aim of the pigment...
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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 Photochemical Reaction Center01:29

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Reaction centers are pigment-protein complexes that initiate energy conversion from photons to chemical entities. Therefore, photochemical reaction center is a more appropriate term that describes these complexes. The Nobel laureates Robert Emerson and William Arnold provided the first experimental evidence of photochemical reaction centers by demonstrating the participation of nearly 2,500 chlorophyll molecules for the release of just one molecule of oxygen. Despite thousands of photosynthetic...
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The Antenna Complex01:15

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Plants and other photosynthetic organisms comprise pigments capable of absorption of direct sunlight. These pigments are present in the reaction center - the main site of photochemical reactions as well as in the antenna complex. Under average light conditions, the rate at which reaction center pigments absorb light is far below the electron transport chain's capacity. As a result, the reaction center alone cannot provide enough energy to drive photosynthesis. The photosynthetic efficiency can...
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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.
Functioning of Photosystems
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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
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Plasmon-driven photoregeneration of cofactor molecules.

Ana Sánchez-Iglesias1, Andrey Chuvilin, Marek Grzelczak

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Platinum-doped gold nanorods regenerate essential cofactor molecules using visible and infrared light. This discovery highlights the potential of plasmonic nanoparticles in advancing biochemical reactions.

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Area of Science:

  • Nanotechnology
  • Biochemistry
  • Photochemistry

Background:

  • Cofactor molecules are essential for numerous biochemical reactions.
  • Regenerating cofactors efficiently is crucial for sustainable biochemical processes.
  • Plasmonic nanoparticles offer unique optical properties for light-driven applications.

Purpose of the Study:

  • To investigate the potential of platinum-doped gold nanorods for cofactor regeneration.
  • To explore the efficacy of visible and infrared light irradiation in this process.
  • To assess the applicability of plasmonic nanoparticles in biocatalysis.

Main Methods:

  • Synthesis of platinum-doped gold nanorods.
  • Irradiation of nanorods with visible and infrared light.
  • Monitoring cofactor regeneration using spectroscopic techniques.

Main Results:

  • Platinum-doped gold nanorods successfully regenerated cofactor molecules.
  • The regeneration process was effective under both visible and infrared light.
  • The study demonstrates the catalytic activity of these plasmonic nanoparticles.

Conclusions:

  • Platinum-doped gold nanorods show significant promise for cofactor regeneration.
  • Light-activated plasmonic nanoparticles can be utilized in biochemical reactions.
  • This research opens new avenues for using nanotechnology in biocatalysis.