EPJ Web of Conferences
Volume 41, 2013XVIIIth International Conference on Ultrafast Phenomena
|Number of page(s)||3|
|Section||Molecular Light Harvesting and Charge-Transfer Complexes|
|Published online||13 March 2013|
Tracing of backward energy transfer from LH1 to LH2 in photosynthetic membranes grown under high and low irradiation.
1 IMDEA Nanoscience, 28049 Cantoblanco, Spain
2 Faculty of Medicine, University of Glasgow, Glasgow G12 8QQ, United Kingdom
3 Institute for Molecular Biology, University of Glasgow, Glasgow G12 8TA, United Kingdom
4 CNR-IFN, Dipartimento di Fisica, Politecnico di Milano, 20133 Milan, Italy
5 Italian Institute of Technology, Center forNanoScience and Technology at Politecnico di Milano, 20133 Milan, Italy
6 Ma Chung Research Center for Photosynthetic Pigments, Ma Chung University, Malang 65151, Indonesia
7 Department of Material Science, Università di Milano Bicocca, 20125 Milan, Italy
By introducing derivative transient absorption spectroscopy, we obtain rate constants for backward and forward energy transfer between LH1 and LH2 complexes in purple bacterial membranes. We find that backward energy transfer is strongly reduced in membranes grown under low irradiation conditions, compared to high light grown ones. We conclude that backward energy transfer is managed actively by the bacteria to avoid LH1 exciton deactivation under high irradiation conditions. The analytical method is generally applicable to excitonically coupled systems.
© Owned by the authors, published by EDP Sciences, 2013
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.