Dual-wavelength UV degradation of bisphenol A and bezafibrate in aqueous solution using excilamps (222, 282 nm) and LED (365 nm): yes or no synergy?

Dual-wavelength ultraviolet (DWUV) irradiation can lead to a synergistic effect in terms of accelerated degradation of emerging organic contaminants in aqueous media. This study compared the kinetics of single-wavelength and DWUV degradation of bisphenol A (BPA) and bezafibrate (BZF) in model aqueous solution using KrCl (222 nm), XeBr (282 nm) excilamps and LED (365 nm). Three novel dual combinations (222 + 282, 222 + 365 and 282 + 365 nm) were examined toward the potential synergy in direct photolysis and advanced oxidation processes (AOPs) using potassium persulfate and hydrogen peroxide. Kinetic comparison showed that the time- and fluence-based synergy did not occur in the dual combinations selected. Meanwhile, the single-wavelength UV treatment using KrCl excilamp was found to be highly efficient for degradation of target contaminants. At a given dosage of oxidants, the UV/S2O82- process exhibited higher performance than the UV/H2O2 one, attaining higher degradation rates and requiring lower UV fluences for 90% removal. This study demonstrates that the catalyst-free UV/S2O82- process using KrCl excilamp has a high potential for efficient removal of such organic contaminants from real waters with low turbidity.

[Age specific disorders in the lymphatic system functions during exogenic intoxication and the ways of their correction].

In mice-experiments the age increase of intoxication hematologic criterium, malonic dialdehyde level in blood serum and progressive inhibition of interstitial humoral transport and tissue lymphatic drainage are shown. Exogenic intoxication enhances these disorders. The medical preparations mexidol, emoxipinum, cytochrom C, chophitol, succinic acid and selen-active, besides inhibiting the process of lipid peroxidation, all exert lymphostimulating effect but of different degree, which is not directly dependent on their antioxidant properties. The possibility to decrease the intensity of lipid peroxide oxidation and other components of intoxication syndrome using interstitial humoral transport and tissue lymphatic drainage stimulation combined with mexidol and chophitol is shown, but in old mice as compared to mature ones medicaments correction of intoxication signs is less effective.

[Polyposition hepatoscintigraphy in the diagnosis of liver metastases]. / Polipozitsionnaia gepatostsintigrafiia v diagnostike metastazov v pechen'.

The examination of 308 patients with oncological lesions has shown that polyposition hepatoscintigraphy with a colloid solution Tc--99m improves the diagnosis of metastatic invasion of the liver by 17.8% compared with the routine one-projection hepatoscintigraphy. Some errors which are likely to arise in interpreting the lateral and posterior hepatoscintigrams are described.