Photosynthesis called P680. The source of electrons for photosynthesis in green plants and cyanobacteria is water. Two water molecules are oxidized by four successive charge-separation reactions by photosystem II to yield a molecule of diatomic oxygen and four hydrogen ions. The electrons yielded are transferred to a redox-active tyrosine residue that then reduces the oxidized P680. This resets the ability of P680 to absorb another photon and release another photo-dissociated electron. The oxidation of water is catalyzed in photosystem II by a redox-active structure that contains four manganese ions and a calcium ion; this oxygen-evolving complex binds two water molecules and
What I Do What I Do What I Do is the twelfth studio album by American country music artist Alan Jackson. It was released on September 7, 2004, and produced four singles for Jackson on the Hot Country Songs charts: "Too Much of a Good Thing" and "Monday Morning Church" both reached #5, while "The Talkin' Song Repair Blues" and "USA Today" both reached #18. "What I Do", however, was the first album of his career not to produce any #1 hits. The Wrights, a duo composed of Adam and Shannon Wright (the former of whom is Jackson's nephew) are featured as background