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A procedure is described th at permits spinach leaves to display secondary fluorescence kinetics when illuminated in air at 20 °C. The initial peak in chlorophyll a fluorescence is then followed by a fall to a quasi-steady state (S), a rise to a new peak (M) and a final fall to a terminal steady-state value (T). These kinetics can be modified by changing the periods of light and darkness before measurement. The M peak is abolished by exposure to C02-free air and greatly modified by exposure todoi:10.1098/rspb.1983.0016 fatcat:7oz5w5q3pvbalcsv4ypf2vo4ti