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3. Energy problems in life evolution.

Author

Samuilov, V.D.

Subjects
*OXYGEN, *BIOENERGETICS, *PHOTOSYNTHESIS, *EFFECT of light on plants, *PHOTOBIOLOGY, *CELL death
Abstract

Evolutionary aspects of bioenergetics are considered. These include the origin of the first organisms, UV-protection and the beginnings of anoxygenic photosynthesis, the electron donor problem of life and the appearance of oxygenic photosynthesis, oxygen danger and strategies of defense, and the role of oxygen in programmed cell death. [ABSTRACT FROM AUTHOR]

Published
2005
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11. Reconstitution of electrogenic function in isolated pigment-protein complexes of Anabaena variabilis

Author

Barsky E.L., Gusev M.V., Kondrashin A.A., Samuilov V.D., Barsky E.L., Gusev M.V., Kondrashin A.A., and Samuilov V.D.

Abstract

Treatment of Anabaena variabilis membranes with lauryldimethylamine N-oxide yielded two fractions of pigment-protein complexes which were separable by gel filtration on Sepharose 6B. A green fraction was characterized which had a maximum of the chlorophyll long-wave absorption band at 678 nm and a small amount of carotenoid. In this fraction, Photosystem I activity was higher than in another (brownish-green) fraction which had a maximum of the chlorophyll absorption band at 673 nm and which was enriched in carotenoids. Similarly to isolated membranes, proteoliposomes containing pigment-protein complexes took up tetraphenylborate anions and tetraphenylphosphonium cations and were found to be capable of light-dependent membrane potential generation, when associated with a planar phospholipid membrane in the presence of reduced phenazine methosulfate upon illumination. The spatial arrangement of the pigment-protein complexes in the native and artificial membranes is discussed. © 1982.

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