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

Smitha Surendran Thamarath, A. Alia, Esha Roy, Karthick Babu Sai Sankar Gupta, John H. Golbeck, Jörg Matysik

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4 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)461-469
Number of pages9
JournalPhotosynthesis research
Volume117
Issue number1-3
DOIs
StatePublished - Nov 2013

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Plant Science
  • Cell Biology

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