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 Cha' Gonna Do for Me What Cha' Gonna Do for Me What Cha' Gonna Do for Me is the Gold certified third solo album by American R&B/funk singer Chaka Khan, released on the Warner Bros. Records label in 1981. Three singles were released from "What Cha' Gonna Do": the Beatles cover "We Can Work It Out" (US R&B #34), the McCrarys cover "Any Old Sunday" (#68) and the album's title track which became a number one hit on "Billboard" R&B Singles chart. On Billboard's charts, the album reached #3 on Black Albums, #33 on Jazz Albums, and #17 on Pop Albums. This would be Chaka's