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CBP PP2 Photosynth

CBP PP2 Photosynth - CBP PP2 Photosynth

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LR/CC/CBP Photosystem I P700 reaction centre Receives energy from light harvesting complex promotes electrons to excited state Electrons lose energy by passing down an electron transport chain
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LR/CC/CBP “Red Drop” Drop in efficiency in red light region L Difference between photosynthesis action spectrum and absorption spectrum at wavelengths between 680nm and 700 nm L Shows that some light which can be absorbed is not contributing efficiently to photosynthesis
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LR/CC/CBP
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LR/CC/CBP RED DROP Chlorophyll Absorption Spectrum Photosynthesis Action Spectrum
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LR/CC/CBP Emerson Enhancement 1 st Expt. Irradiate at 700 nm, measure O 2 evolution 2 nd Expt . Irradiate at 650 nm, measure O 2 evolution 3 rd Expt. Irradiate simultaneously 650 + 700 nm, L Quantity of O 2 evolved greater than the sum for the two wavelengths separately L Evidence for the existence of two processes using light 4th Expt E Irradiate with sequential flashes of 650 + 700 nm, L Enhancement still observed L Evidence for a stable long-lived intermediate
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