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Related Concept Videos

Photosystem II01:22

Photosystem II

79.4K
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 6, 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 Psoria-sis.

G H Hajini, S T Hussain, M Kaur

    Indian Journal of Dermatology, Venereology and Leprology
    |March 8, 2017
    PubMed
    Summary

    Photochemotherapy using psoralen and ultraviolet radiation (PUV) effectively treated 50 psoriasis patients. Complete lesion clearance was achieved in all patients within 45 days, demonstrating PUV

    Area of Science:

    • Dermatology
    • Photobiology
    • Photomedicine

    Background:

    • Psoriasis is a chronic inflammatory skin condition.
    • Current treatments have limitations.
    • Photochemotherapy offers a potential therapeutic avenue.

    Purpose of the Study:

    • To evaluate the efficacy and safety of psoralen and ultraviolet radiation (PUV) for psoriasis treatment.
    • To analyze treatment outcomes in a cohort of psoriatic patients.

    Main Methods:

    • Treatment involved 50 patients with psoriasis.
    • Administration of psoralen followed by exposure to ultraviolet radiation (UVR).
    • Data analysis of lesion clearance and treatment duration.

    Main Results:

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    • No patients were resistant to PUV treatment.
    • Complete lesion clearance observed in 22% by day 16, 96% by day 40, and 100% by day 45.
    • The treatment demonstrated a high success rate across the patient cohort.

    Conclusions:

    • Photochemotherapy with psoralen and ultraviolet radiation is a safe and effective treatment for psoriasis.
    • Conventional UV radiation therapy lamps can be utilized for this treatment.
    • PUV therapy offers a viable option for managing psoriasis.