RESUMO
Terbium-doped Al2O3 samples were obtained by gas-dispersed synthesis. It was shown that the resulting powders, with particle sizes of 10-70 nm, consist of a mixture of transition aluminas, among which the δ *-polymorph is dominant. The luminescence properties of Al2O3:Tb3+ have been studied upon excitation in the UV-visible range of the spectrum. It was found that Tb3+ ions cause several groups of inhomogeneously broadened emission bands in the range of 470-640 nm, which are characteristic for disordered materials. In addition, the emission spectra contain a broad band at about 450 nm and several narrower ones in the 680-720 nm region. These features are attributed to surface defects and impurity Cr3+ ions occupying Al3+ octahedral positions, respectively.
RESUMO
Effect of Roccal (alkyldimethylbenzylammonium chloride) applications on the progress of liver recovery after damaging it by oral introduction of carbon tetrachloride (CCl4) to adult nonline rats twice a week during a month at the dosage of 0.1 ml/100 g of 50% oil solution was investigated. The Roccal applications at the dosage 10 mg/kg (1/50 DL50 skin) during a month 5 times a week intensify the functional and morphological liver damage, slows down the recovery, provokes earlier nephrotoxic effect, modifies the changes of nitrogen balance. The other phenomena of the toxic hepatopathy and the resorbtive effect of Roccal were manifested on the subcellular level by the intracellular liver hypertrophy, the damage of glycerophosphatic mitochondrial shunt, the increase of catabolism, probably the accumulation of the peroxidated products in the blood leukocytes. The changes of the leukocytes enzymatic status were aggravated by the influence of Roccal during the recovering process of the experimental hepatopathy.
