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Science 7 June 1963:
Vol. 140. no. 3571, pp. 1095 - 1097
DOI: 10.1126/science.140.3571.1095
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Articles

Photosynthetic Mutants Separate Electron Paramagnetic Resonance Signals of Scenedesmus

Ellen C. Weaver 1 and Norman I. Bishop 2

1 Biophysics Laboratory, Stanford University, Stanford, California
2 Institute of Molecular Biophysics, Florida State University, Tallahassee

Current schemes for the mechanism of the photosynthesis reaction imply a two-part cycle; one part produces a strong photoreductant, the other functions to release molecular oxygen. Wild-type Scenedesmus exhibits the two light-induced electron-paramagnetic resonances typical of green algae and chloroplasts of higher plants. These resonances indicate the presence of unpaired electrons in at least two sites. By means of mutants which are blocked in one or the other part of the dual cycle, the narrow, rapidly decaying signal can be correlated with the photoreductant part, and the broad, slowly decaying signal can be correlated with the part releasing molecular oxygen.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Spin Label Studies in Chlamydomonas.
E. C. Weaver and H. P. Chon (1966)
Science 153, 301-303
   Abstract »    PDF »
The Biophysical Problems of Photosynthesis.
R. K. Clayton (1965)
Science 149, 1346-1354
   PDF »


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Science. ISSN 0036-8075 (print), 1095-9203 (online)