1 0:48 Pocahontas Trailer Pocahontas When English settlers land on the shores of her village, a free-spirited girl wonders what history-changing adventures await.
The gray (Gy), which is the SI unit of absorbed dose, corresponds to the absorption of 1 J of energy per kilogram of tissue. The rad (radiation absorbed dose) corresponds to the absorption of 1 10â2 J of energy per kilogram of tissue. Thus, 1 Gy = 100 rads. The rad is the unit most often used in medicine.
Light is absorbed by the antenna pigments of photosystems II and I. The absorbed energy is transferred to the reaction center chlorophylls, P680 in photosystem II, P700 in photosystem I. Absorption of 1 photon of light by Photosystem II removes 1 electron from P680.