2 mm EPR spectroscopy reveals significant differences between the g-tensors of the oxidized primary donor in reaction centers of the photosynthetic bacteria Rb. sphaeroides R-26 and Rps. viridis: the principal values are gxx= 2.00159, gyy= 2.00224 and gzz= 2.00402, and gxx = 2.00180, gyy = 2.00235 and gxx= 2.00380, respectively. Similarly, the g-tensors of the tyrosyl YD radical in the D2subunit of the reaction center of plant photosystem II and of oxidized tyrosine in vitro are found to be quite different, with principal values of gxx= 2.00212, gyy= 2.00426 and gzz = 2.00752, and gxx= 2.00181, g = 2.00381 and gzz= 2.00613, respectively. The observed differences probably reflect differences in the molecular structure of the radicals investigated.
ASJC Scopus subject areas
- Chemical Engineering(all)