TY JOUR TI Delayed fluorescence of sensitizer in biological tissues with low oxygen tension KW singlet oxygen KW biological tissue oxygenation KW singlet-triplet annihilation KW delayed fluorescence JO Russian Journal of Biological Physics and Chemisrty AU Ishemgulov, A.T. AU Letuta, S.N. AU Pashkevich, S.N. PY 2017 IS 2 PB Federal State Educational Institution of Higher Education Sevastopol State University