Two Forms of Chlorophyll a in vivo with Distinct Photochemical Functions

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Science  05 Aug 1960:
Vol. 132, Issue 3423, pp. 355-356
DOI: 10.1126/science.132.3423.355


Action spectra of the Emerson effect in Chlorella and Navicula reveal peaks at 670 mut, in addition to those at 650 mu (Chlorella) and 630 mµ (Navicula) attributable to chlorophylls b and c. Thus, excitation of chlorophyll a form "chlorophyll a 670" can supplement, in these algae, the excitation of the form "chlorophyll a 680-700." The effect of the auxiliary pigments in these algae may be mediated by energy transfer to "chlorophyll a 670."