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 U Need? Song Festival in Busan, South Korea. "what U need?" was performed together with "Lose Control" at the SMG New Year's Eve Gala 2017 in Baoshan Sports Centre, Shanghai on December 31, 2016. "what U need" stayed at #1 on the Alibaba Real Time Music Chart in China for three consecutive weeks. The single and the music video appeared at the top of music charts in China, Hong Kong, Japan, Malaysia, Thailand, UK, Turkey, Canada and the United States. The song hit the #4 spot on the China V Chart as well as in Billboard's World Digital Songs. Additionally, the song