Fluorescence and Absorption Changes in Chlorella Exposed to Strong Light: The Red Band

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Science  08 Nov 1963:
Vol. 142, Issue 3593, pp. 681-682
DOI: 10.1126/science.142.3593.681


The reversible decrease in the apparent intensity of the main red absorption band of chlorophyll a at 680 mν upon strong illumination of Chlorella cells, described by Coleman and Rabinowitch in 1957, is shown, by a polarization method, to be due to an increase in the fluorescence yield. True absorption changes are observed at 657 mν (positive) and 648 mν (negative).