RESUMO
In the paper, investigation results of the uptake efficiency of radionuclides 60Co, 90Sr, and 137Cs dissolved in water onto iron oxides α-Fe2O3 and Fe3O4 are presented. It was found that sorption efficiency increased for higher pH values. Independent of the oxide nature, the uptake characteristics are the best toward 60Co and the worst toward 137Cs, forming the row as follows: 60Co > 90Sr > 137Cs. The highest sorption ability at pH 9 was found for magnetite Fe3O4, which was 93%, 73%, and 26% toward 60Co, 90Sr, and 137Cs, respectively, while the respective percentages for hematite α-Fe2O3 were 85%, 41%, and 18%. It was assumed that the main sorption mechanism was ion exchange. That may explain some decrease of the sorption efficiency in drinking water due to the interfering presence of magnesium and calcium cations. The obtained results indicated the feasibility of the tested sorbents and their merits, especially in terms of relatively high uptake coefficients, low costs, availability, and lack of toxicity.
RESUMO
The aim of the study was to estimate regional cerebral blood flow (rCBF) and cognitive function in patients with metabolic syndrome (MetS) before and after antihypertensive combination therapy. The study included 24 patients with MetS (average age 52.4±1.6 years). All patients underwent brain single-photon emission computed tomography with technetium-99m hexamethylpropyleneamine oxime and comprehensive neuropsychological testing before and after 6-month antihypertensive combination therapy. All patients with MetS showed lower rCBF values in all regions of the brain compared with the control group. Their parameters of attention, immediate visual memory, and mentation were lower by 25%, 22%, and 13% compared with the control group, respectively. Six-month antihypertensive combination therapy increased cerebral perfusion and improved attention, mentation, and visual memory in MetS patients.
