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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Mcconnell, Michael D. Van Grondelle, Rienk Gibasiewicz, Krzysztof Szewczyk, Sebastian Snellenburg, Joris Giera, Wojciech Redding, Kevin E. |
| Description | Author Affiliation: Giera W ( Department of Physics, Adam Mickiewicz University, ul. Umultowska 85, 61-614 Poznan, Poland. Electronic address: w_giera@amu.edu.pl.); Szewczyk S ( Department of Physics, Adam Mickiewicz University, ul. Umultowska 85, 61-614 Poznan, Poland.); McConnell MD ( Department of Chemistry and Biochemistry, Arizona State University, 1711 S. Rural Rd, Box 871604, Tempe, AZ 85287-1604, USA.); Snellenburg J ( Department of Physics and Astronomy, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands.); Redding KE ( Department of Chemistry and Biochemistry, Arizona State University, 1711 S. Rural Rd, Box 871604, Tempe, AZ 85287-1604, USA.); van Grondelle R ( Department of Physics and Astronomy, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands.); Gibasiewicz K ( Department of Physics, Adam Mickiewicz University, ul. Umultowska 85, 61-614 Poznan, Poland.) |
| Abstract | Identical time-resolved fluorescence measurements with ~ 3.5-ps resolution were performed for three types of PSI preparations from the green alga, Chlamydomonas reinhardtii : isolated PSI cores, isolated PSI–LHCI complexes and PSI–LHCI complexes in whole living cells. Fluorescence decay in these types of PSI preparations has been previously investigated but never under the same experimental conditions. As a result we present consistent picture of excitation dynamics in algal PSI. Temporal evolution of fluorescence spectra can be generally described by three decay components with similar lifetimes in all samples (6–8 ps, 25–30 ps, 166–314 ps). In the PSI cores, the fluorescence decay is dominated by the two fastest components (~ 90%), which can be assigned to excitation energy trapping in the reaction center by reversible primary charge separation. Excitation dynamics in the PSI–LHCI preparations is more complex because of the energy transfer between the LHCI antenna system and the core. The average trapping time of excitations created in the well coupled LHCI antenna system is about 12–15 ps longer than excitations formed in the PSI core antenna. Excitation dynamics in PSI–LHCI complexes in whole living cells is very similar to that observed in isolated complexes. Our data support the view that chlorophylls responsible for the long-wavelength emission are located mostly in LHCI. We also compared in detail our results with the literature data obtained for plant PSI. |
| ISSN | 00063002 |
| Journal | Biochimica et Biophysica Acta (BBA) - Reviews on Cancer |
| Issue Number | 10 |
| Volume Number | 1837 |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2014-10-01 |
| Publisher Place | Netherlands |
| Access Restriction | Open |
| Subject Keyword | Chlamydomonas Reinhardtii Metabolism Photosystem I Protein Complex Genetics Chlorophyll Spectrometry, Fluorescence Comparative Study Research Support, Non-U.S. Gov't Biochemistry |
| Content Type | Text |
| Resource Type | Article |
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