caa a22 4500 445890274 CHVBK 20180317145614.0 cr unu---uuuuu 170323e20110901xx s 000 0 eng 10.1007/s11120-011-9657-x doi (NATIONALLICENCE)springer-10.1007/s11120-011-9657-x Phosphorescence study of chlorophyll d photophysics. Determination of the energy and lifetime of the photo-excited triplet state. Evidence of singlet oxygen photosensitization [Elektronische Daten] [Konstantin Neverov, Stefano Santabarbara, Alexander Krasnovsky Jr.] Chlorophyll d (Chl d) is the major pigment in both photosystems (PSI and II) of the cyanobacterium Acaryochloris marina, whose pigment composition represents an interesting alternative in oxygenic photosynthesis. While abundant information is available relative to photophysical properties of Chl a , the understanding of Chl d photophysics is still incomplete. In this paper, we present for the first time a characterization of Chl d phosphorescence, which accompanies radiative deactivation of the photoexcited triplet state of this pigment. Reliable information was obtained on the energy and lifetime of the Chl d triplet state in frozen solutions at 77K using diethyl ether and aqueous dispersions of Triton X100 as solvents. It is shown that triplet Chl d is effectively populated upon photoexcitation of pigment molecules and efficiently sensitizes singlet oxygen phosphorescence in aerobic solutions under ambient conditions. The data obtained are compared with the previous results of the phosphorescence studies of Chl a and Pheo a, and their possible biological implications are discussed. Springer Science+Business Media B.V., 2011 Chlorophyll d nationallicence Phosphorescence nationallicence Triplet state nationallicence Singlet oxygen nationallicence Neverov Konstantin A.N. Bach Institute of Biochemistry, Russian Academy of Science, Leninskii pr., 33, 119071, Moscow, Russian Federation aut Santabarbara Stefano Istituto di Biofisica, Consiglio Nazionale delle Ricerche, Via Celoria 26, 20133, Milan, Italy aut Krasnovsky Jr. Alexander A.N. Bach Institute of Biochemistry, Russian Academy of Science, Leninskii pr., 33, 119071, Moscow, Russian Federation aut Photosynthesis Research Springer Netherlands 108/2-3(2011-09-01), 101-106 0166-8595 108:2-3<101 2011 108 11120 https://doi.org/10.1007/s11120-011-9657-x text/html Onlinezugriff via DOI 1 review-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11120-011-9657-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Neverov Konstantin A.N. Bach Institute of Biochemistry, Russian Academy of Science, Leninskii pr., 33, 119071, Moscow, Russian Federation aut NATIONALLICENCE 700 1- Santabarbara Stefano Istituto di Biofisica, Consiglio Nazionale delle Ricerche, Via Celoria 26, 20133, Milan, Italy aut NATIONALLICENCE 700 1- Krasnovsky Jr Alexander A.N. Bach Institute of Biochemistry, Russian Academy of Science, Leninskii pr., 33, 119071, Moscow, Russian Federation aut NATIONALLICENCE 773 0- Photosynthesis Research Springer Netherlands 108/2-3(2011-09-01), 101-106 0166-8595 108:2-3<101 2011 108 11120 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer