Effect of temperature and oxygen on luminescence spectra and polarization of divinylbenzoxazolylbiphenyl thin films.

H-type molecular aggregation as assembly with chromophore dipoles arranged parallel to each other has been observed in absorption and luminescence spectra of divinylbenzoxazolylbiphenyl thin films deposited on quartz glass substrate by thermovacuum method. The reversible changes of fluorescence anisotropy have been observed under film heating below the glass transition temperature correlating with lifetime changes. The addition of oxygen was found to cause an essential luminescence quenching.

[In vitro effect of 1,2-dihydro-3H-1,4-benzodiazepine-2-one derivatives on the platelet aggregation and lipid peroxidation in rats].

There were discovered the anti-aggregative properties of some psychotropic drugs as gidazepam, phenazepam and its derivatives 3-oxyphenazepam, esters of 3-oxyphenazepam, with IC50 values of 8.19-11 x 10(-4) M. On their anti-aggregative effects they exceed of the acetylsalicylic acid (IC50 = 21.

[Transport of 2,5-dimethoxy-4-methylamphetamine by macroheterocycles across erythrocyte membranes].

Transport of 2,5-dimethoxy-4-methylamphetamine across human erythrocytes by the 18-crown-6, monoaza-15-crown-5 and diaza-18-crown-6 is studied and evaluated spectrophotometrically. It is shown that crown-ethers at low concentration (1-2 mM) protect erythrocytes against their natural homolysis. 2,5-dimethoxy-4-methylamphetamine provides 2-5% hemolysis of erythrocytes.

[Dynamics of calmodulin in cerebral structures under the action of modulated UHF electromagnetic fields].

The influence of modulated UHF-electromagnetic fields (low intensity) on calmodulin levels in several brain structures was studied. It was shown that UHF-electromagnetic fields influence calmodulin levels in the hypothalamus and sensorimotor cortex. Its effect depends on modulation regimes.