Plant Physiol.
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Plant Physiology 59:196-202 (1977)
© 1977 American Society of Plant Biologists

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Articles

Partial Analysis of the Bands Seen in Circular Dichroism Spectra of Green and Blue-Green Algal Cells and Thylakoids

B. Nathanson1 and J. E. White2

1 Department of Biological Sciences, Hunter College of the City University of New York, New York 10021, Department of Biological Sciences, New York City Community College of the City University of New York, New York

A comparison was made of the circular dichroism (C.D.) spectra of Chlorella, Euglena, and Anacystis cells and thylakoids. Analyses of the spectra reveal that these C.D. bands are similar to those observed previously in whole spinach choloroplasts and subchloroplast particles. C.D. spectra of Euglena chloroplasts show bands at longer wavelengths than previously reported. From comparisons of circular dichroism spectra and fine structure, it was concluded that: (a) bands seen in circular dichroism spectra were not the result of light scattering from thylakoid membranes; and (b) bands seen in the C.D. spectra of nonmembranous systems (previously reported) could account for circular dichroism of algae. We also concluded that comparisons would have to be made with model systems in order to correct for effects of absorption flattening, concentration obscuring, and differential light scattering of membranous systems.






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Copyright © 1977 by the American Society of Plant Biologists