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Phycobilisomes: Structure and Dynamics

Phycobilisomes: Structure and Dynamics The process of photosynthesis is initiated by the absorption of light. Emer­ son & Amold (26, 27) showed that the photochemical reactions were com­ plete in less than l<r5 s, whereas about 0.02 s at 25°C was required for the completion of the dark reactions of photosynthesis. By exploiting this ki­ netic diffe:rence, they concluded from studies with Chlorella pyrenoidosa "that for e:very 2480 molecules of chlorophyll there is present in the cell one unit capable of reducing one molecule of carbon dioxide each time it is 173 0066-4227/82/1001-0173$02.00 GLAZER suitably activated by light" (27). The actual parameter measured by Emer­ son & Arnold (26, 27) was the evolution of oxygen. Since it is now known that primary photochemistry involves the promotion of a single electron transfer per quantum absorbed, and that the in vivo requirement for the evolution of a molecule of oxygen is eight quanta (23), the actual size of the photosynthetic unit deduced from the data of Emerson & Arnold is 2480/8, i.e. 310 chlorophylls a and h. In oxygen-evolving photosynthetic organisms, the photosynthetic unit contains two distinct reaction centers: photosystem II (P680), responsible for the photolysis of water; and photosystem I (P7oo), readily quantitated http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Annual Review of Microbiology Annual Reviews

Phycobilisomes: Structure and Dynamics

Glazer, A N
Annual Review of Microbiology , Volume 36 (1) – Oct 1, 1982
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Publisher
Annual Reviews
Copyright
Copyright 1982 Annual Reviews. All rights reserved
Subject
Review Articles
ISSN
0066-4227
eISSN
1545-3251
DOI
10.1146/annurev.mi.36.100182.001133
pmid
6816134
Publisher site
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Abstract

The process of photosynthesis is initiated by the absorption of light. Emer­ son & Amold (26, 27) showed that the photochemical reactions were com­ plete in less than l<r5 s, whereas about 0.02 s at 25°C was required for the completion of the dark reactions of photosynthesis. By exploiting this ki­ netic diffe:rence, they concluded from studies with Chlorella pyrenoidosa "that for e:very 2480 molecules of chlorophyll there is present in the cell one unit capable of reducing one molecule of carbon dioxide each time it is 173 0066-4227/82/1001-0173$02.00 GLAZER suitably activated by light" (27). The actual parameter measured by Emer­ son & Arnold (26, 27) was the evolution of oxygen. Since it is now known that primary photochemistry involves the promotion of a single electron transfer per quantum absorbed, and that the in vivo requirement for the evolution of a molecule of oxygen is eight quanta (23), the actual size of the photosynthetic unit deduced from the data of Emerson & Arnold is 2480/8, i.e. 310 chlorophylls a and h. In oxygen-evolving photosynthetic organisms, the photosynthetic unit contains two distinct reaction centers: photosystem II (P680), responsible for the photolysis of water; and photosystem I (P7oo), readily quantitated

Journal

Annual Review of Microbiology – Annual Reviews

Published: Oct 1, 1982

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