Berkeley Researchers Identify Photosynthetic Dimmer Switch (13 May 2008) the chlorophyll's energy back down to its groundstate and turning the zeaxanthin...: "Architecture of a Charge-Transfer State Regulating Light Harvesting in a Plant... and thereby modulate the energy of the chlorophylls-zeaxanthin charge-transfer state...
Nanoscopic Lamps (02 Feb 2005) Lipid-coated nanocrystals as local light sources for the fluorescence stimulation of specifically bound proteins with light of a certain wavelength, they entered an excited state. Normally, they would... what the proteins need to get excited themselves. As they return to their groundstate, the proteins emit this energy as red fluorescence, which can be detected...