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1. Roy, E. Biological diversity of photosynthetic reaction centers and the solid-state photo-CIDNP effect.

Degree: 2007, Solid state NMR group/ Leiden Institute of Chemistry (LIC), Faculty of Science, Leiden University

Photosynthetic reaction centers (RCs) from plants, heliobacteria and green sulphur bacteria has been investigated with photochemically induced dynamic nuclear polarization (photo-CIDNP) MAS NMR. In photosystem (PS) I of spinach, all signals appear negative which is proposed by a predominance of the three spin mixing (TSM) over the differential decay (DD) mechanism. There are contrasting magnetic-field dependence of photo-CIDNP of PSI and PSII. For PSII the optimal NMR enhancement factor of ~5000 is observed at 4.7 T, while the strongest light-induced signals of PSI are at 9.4 T. The simulations indicate that difference between bacterial RCs and plant PS I can be due to an increase of the exchange coupling between the donor and acceptor radicals. In the RCs of Chlorobium tepidum the spectra appear negative and can be tentatively assigned to two bacterio chlorophyll a molecules of the donor. The spectral pattern obtained from membrane fragments of Heliobacillus mobilis at 4.7 T, appear to be both positive and negative, which is similar to the pattern observed in the RCs of plant PSII and RCs of Rhodobacter sphaeroides R-26. However, unlike the other RCs, in this system, at 17.6 T, the positive signals undergo a sign change and appear negative. Advisors/Committee Members: Supervisor: Groot H.J.M. de Co-Supervisor: Matysik J..

Subjects/Keywords: Chlorobium tepidum; Heliobacillus mobilis; Photo-CIDNP; Photosynthetic reaction centers; Photosystem I; Solid-state NMR; Chlorobium tepidum; Heliobacillus mobilis; Photo-CIDNP; Photosynthetic reaction centers; Photosystem I; Solid-state NMR

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Roy, E. (2007). Biological diversity of photosynthetic reaction centers and the solid-state photo-CIDNP effect. (Doctoral Dissertation). Solid state NMR group/ Leiden Institute of Chemistry (LIC), Faculty of Science, Leiden University. Retrieved from http://hdl.handle.net/1887/12373

Chicago Manual of Style (16th Edition):

Roy, E. “Biological diversity of photosynthetic reaction centers and the solid-state photo-CIDNP effect.” 2007. Doctoral Dissertation, Solid state NMR group/ Leiden Institute of Chemistry (LIC), Faculty of Science, Leiden University. Accessed October 01, 2020. http://hdl.handle.net/1887/12373.

MLA Handbook (7th Edition):

Roy, E. “Biological diversity of photosynthetic reaction centers and the solid-state photo-CIDNP effect.” 2007. Web. 01 Oct 2020.

Vancouver:

Roy E. Biological diversity of photosynthetic reaction centers and the solid-state photo-CIDNP effect. [Internet] [Doctoral dissertation]. Solid state NMR group/ Leiden Institute of Chemistry (LIC), Faculty of Science, Leiden University; 2007. [cited 2020 Oct 01]. Available from: http://hdl.handle.net/1887/12373.

Council of Science Editors:

Roy E. Biological diversity of photosynthetic reaction centers and the solid-state photo-CIDNP effect. [Doctoral Dissertation]. Solid state NMR group/ Leiden Institute of Chemistry (LIC), Faculty of Science, Leiden University; 2007. Available from: http://hdl.handle.net/1887/12373

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