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  Exploring the mechanism(s) of energy dissipation in the light harvesting complex of the photosynthetic algae Cyclotella meneghiniana.

Ramanan, C., Berera, R., Gundermann, K., van Stokkum, I. H., Büchel, C., & van Grondelle, R. (2014). Exploring the mechanism(s) of energy dissipation in the light harvesting complex of the photosynthetic algae Cyclotella meneghiniana. Biochimica et Biophysica Acta (BBA) - General Subjects, 1837(9), 1507-1513. doi:10.1016/j.bbabio.2014.02.016.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-4A39-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-4A3A-8
Genre: Journal Article

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 Creators:
Ramanan, Charusheela1, Author              
Berera, Rudi, Author
Gundermann, Kathi, Author
van Stokkum, Ivo H.M., Author
Büchel, Claudia, Author
van Grondelle, Rienk, Author
Affiliations:
1Division of Biophysics, Department of Physics and Astronomy, Faculty of Sciences, VU University Amsterdam, The Netherlands, ou_persistent22              

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Free keywords: Diatoms,Light-harvesting,Non-photochemical quenching,Photoprotection,Photosynthesis,Transient absorption
 Abstract: Photosynthetic organisms have developed vital strategies which allow them to switch from a light-harvesting to an energy dissipative state at the level of the antenna system in order to survive the detrimental effects of excess light illumination. These mechanisms are particularly relevant in diatoms, which grow in highly fluctuating light environments and thus require fast and strong response to changing light conditions. We performed transient absorption spectroscopy on FCPa, the main light-harvesting antenna from the diatom Cyclotella meneghiniana, in the unquenched and quenched state. Our results show that in quenched FCPa two quenching channels are active and are characterized by differing rate constants and distinct spectroscopic signatures. One channel is associated with a faster quenching rate (16ns(-1)) and virtually no difference in spectral shape compared to the bulk unquenched chlorophylls, while a second channel is associated with a slower quenching rate (2.7ns(-1)) and exhibits an increased population of red-emitting states. We discuss the origin of the two processes in the context of the models proposed for the regulation of photosynthetic light-harvesting. This article is part of a Special Issue entitled: Photosynthesis Research for Sustainability: Keys to Produce Clean Energy.

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Language(s): eng - English
 Dates: 20142014
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.bbabio.2014.02.016
 Degree: -

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Title: Biochimica et Biophysica Acta (BBA) - General Subjects
  Other : BBA
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 1837 (9) Sequence Number: - Start / End Page: 1507 - 1513 Identifier: ISSN: 0926-6577
CoNE: https://pure.mpg.de/cone/journals/resource/111053442500014