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Contact: Lynn Yarris
DOE/Lawrence Berkeley National Laboratory

Photosystem II

Caption: Photosytem II utilizes a water-splitting manganese-calcium enzyme that when energized by sunlight catalyzes a four photon-step cycle of oxidation states (S0-to-S3). When S3 absorbs a photon, molecular oxygen (O2) is released and So is generated. S4 is a transient state on the way to So.

Credit: SLAC Linear Accelerator Center

Usage Restrictions: None

Related news release: Postcards from the photosynthetic edge

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