Abstract
Mathematical analysis of the results of mild acetone extraction of chloro-plast-fragment preparations from Ulva lactuca demonstrates that the 640-nm shoulder on the short-wave side of the red chlorophyll b absorption band is not due to this chlorophyll. The analysis furthermore provides rather strong evidence that the 640-nm shoulder is correlated with an absorption band peaking around 682nm. It is suggested that the 640-nm component is due to the reaction center pigment of Photo-system II.
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