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 Can You Do for Me What Can You Do for Me "What Can You Do For Me" is the debut single by English electronic group Utah Saints. The song was released on 12 August 1991 and reached a peak position of number 10 in the UK Singles Chart. The song uses samples from "There Must Be an Angel (Playing with My Heart)" by Eurythmics and "Ain't Nothin' Goin' on But the Rent" by Gwen Guthrie. The single was released in August 1991 and entered the UK Singles Chart on 18 August at number 26. The song steadily rose up the chart and peaked at number