LIGHT-INDUCED ABSORBANCY CHANGES IN EIMHJELLEN''S RHODOPSEUDOMONAS* |
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Authors: | A. S. Holt Roderick K. Clayton |
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Affiliation: | Division of Biosciences, National Research Council, Ottawa, Canada Charles F. Kettering Research Laboratory, Yellow Springs, Ohio |
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Abstract: | Abstract— Light induced absorbancy changes in Rhodopseudomonas sp. NHTC 133 are analogous to those observed in other photosynthetic bacteria, but all of the features in the light-induced difference spectrum (except those reflecting cytochrome oxidation) are shifted to greater wavelengths. This general shift is consistent with the fact that the bacteriochlorophyll of this organism (BChl b ) differs from the usual BChl in that its absorption bands are shifted to greater wavelengths. The singlet excited state of P985 (the counterpart of the P870 of Rhodopseudomonas spheroides ) is not an energy sink relative to the major component of BChl b in vivo . The absorption maximum of P985 is at 985 mp, whereas that of CBhl b in vivo is at 1012 mμ. |
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