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Related Concept Videos

Photosystem II01:22

Photosystem II

79.5K
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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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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The Photochemical Reaction Center01:29

The Photochemical Reaction Center

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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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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
Photosystems contain many pigment molecules, such as chlorophylls and carotenoids, arranged in a particular organization across two domains — the antenna complex and the reaction center. The main aim of the pigment...
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Related Experiment Video

Updated: Mar 7, 2026

The Goeckerman Regimen for the Treatment of Moderate to Severe Psoriasis
11:39

The Goeckerman Regimen for the Treatment of Moderate to Severe Psoriasis

Published on: July 11, 2013

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Photochemotherapy for Psoriasis.

Yogendra Sharma

    Indian Journal of Dermatology, Venereology and Leprology
    |February 7, 2017
    PubMed
    Summary

    Photochemotherapy (PUVA) effectively treated psoriasis in 35 patients, clearing lesions within 5 to 35 days. The treatment demonstrated a high success rate with no severe adverse effects observed.

    Area of Science:

    • Dermatology
    • Phototherapy

    Background:

    • Psoriasis is a chronic autoimmune condition.
    • Effective and safe treatment options are needed.

    Purpose of the Study:

    • To evaluate the efficacy and safety of PUVA therapy for psoriasis.

    Main Methods:

    • Thirty-five patients with psoriasis received PUVA treatment.
    • Treatment outcomes and side effects were monitored.

    Main Results:

    • Complete lesion clearance was achieved in 33 out of 35 patients.
    • Lesion clearance occurred within 5 to 35 days of treatment initiation.
    • No serious side effects were reported during the study.

    Conclusions:

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    • PUVA therapy is a highly effective treatment for psoriasis.
    • The treatment offers rapid and safe lesion clearance for psoriatic patients.