[On Individualization of Therapeutic Doses of Optical Radiation according to Changes in Parameters of Blood Oxygenation].

The effect of in vivo laser irradiation by optical radiation on blood from different patients is studied. The objects of research were three series of blood samples from patients whose treatment course included extracorporeal UV blood irradiation, intravenous laser blood irradiation and supra-venous blood laser irradiation. Before and after irradiation the results on optic oximetry and gas content of venous blood were compared. The results of positive and negative influence of blood irradiation on characteristics of an oxygen exchange in separate patients and on the maintenance of some products of metabolism are represented. It is shown that at the same power dose, their changes depend on individual, initial values of hemoglobin oxygen saturation of venous blood and its photoinduced changes which objectively reflect individual sensitivity of patients to the action of optical radiation on blood and can be used for assessment of the efficiency of phototherapy.

Oxygen quenching of excited singlet and triplet states of polycyclic aromatic hydrocarbons in the vapor phase.

The quenching rate constants of excited singlet (k(S)(O2)) and triplet (k(T)(O2)) states by oxygen were investigated in the vapor phase for polycyclic aromatic hydrocarbons having distinguishing oxidation potentials E(ox). The significant spread in the rate constants was found (4x10(5)s(-1)Torr(-1)

Photoinduced gas-phase electron transfer reactions.

The electron transfer quenching process, when a reactive excited state is singlet or triplet, for gas-phase systems (benzophenone and anthraquinone with amines and pyridine as well as carbazole with halomethanes) was systematically investigated using time-resolved fluorescence. Bimolecular rate constants were obtained. Variable-temperature measurements were performed for eight donor-acceptor pairs. It was found that under solvent-free conditions various quenchers differing in photochemical reactivity led to change in quenching rates by almost three orders of magnitude. Positive and negative temperature dependences for the electron transfer rate constants were observed. The data were analyzed in terms of the Marcus-Jortner theory.