The field-dependence of the solid-state photo-CIDNP effect in two states of heliobacterial reaction centers

被引：0
|
作者：
Smitha Surendran Thamarath
A. Alia
Esha Roy
Karthick Babu Sai Sankar Gupta
John H. Golbeck
Jörg Matysik
机构：
[1] Leiden Institute of Chemistry,Department of Chemistry, Department of Biochemistry and Molecular Biology
[2] Leiden University,undefined
[3] Institut für Analytische Chemie,undefined
[4] Universität Leipzig,undefined
[5] The Pennsylvania State University,undefined
来源：
Photosynthesis Research | 2013年 / 117卷
关键词：
Heliobacteria; Electron transfer; Photo-CIDNP; Solid-state NMR; Magnetic field effect;
D O I：
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摘要：
The solid-state photo-CIDNP (photochemically induced dynamic nuclear polarization) effect is studied in photosynthetic reaction centers of Heliobacillus mobilis at different magnetic fields by 13C MAS (magic-angle spinning) NMR spectroscopy. Two active states of heliobacterial reaction centers are probed: an anaerobic preparation of heliochromatophores (“Braunstoff”, German for “brown substance”) as well as a preparation of cells after exposure to oxygen (“Grünstoff”, “green substance”). Braunstoff shows significant increase of enhanced absorptive (positive) signals toward lower magnetic fields, which is interpreted in terms of an enhanced differential relaxation (DR) mechanism. In Grünstoff, the signals remain emissive (negative) at two fields, confirming that the influence of the DR mechanism is comparably low.
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页码：461 / 469
页数：8
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