Studies on the Efficiency of Iron Release from Fe(III)-EDTA and Fe(III)-Cit and the Suitability of These Compounds for Tetracycline Degradation.

Iron ions can be used to degrade tetracycline dispersed in nature. Studies of absorption and fluorescence spectra and quantum chemistry calculations showed that iron is more readily released from Fe(III)-citrate than from Fe(III)-EDTA, so Fe(III)-citrate (Fe(III)-Cit) is more suitable for tetracycline (TC) degradation. At 30 °C, a severe degradation of TC by Fe(III)-Cit occurred as early as after 3 days of incubation in the light, and after 5 days in the dark.

The effect of polyunsaturated fatty acids on cardiovascular risk factors and urinary mercury in workers employed at electrolytic production of chlorine.

Objectives: While inorganic mercury is being gradually withdrawn from industry, environmental exposure to mercury is recognized as one of the greatest present toxicological problems. The aim of this study was to evaluate the effect of polyunsaturated fatty acids (PUFAs) supplementation on selected cardiovascular risk factors and the urinary mercury (Hg-U) concentration in workers occupationally exposed to mercury vapor.

Material And Methods: Overall, 38 workers of an electrolyzer hall (Hg-U: 46.

Spectroscopic Evidence for Photooxidation of Tocopherols in n-Hexane.

This paper presents the results of an investigation into the photooxidation of tocopherols (Tocs) dissolved in argonated and non-argonated n-hexane. During irradiation, steady-state absorption and fluorescence spectra as well as lifetimes were measured. In all experiments, the photoreactions were of the first order type.

Excited-State Proton Transfer in 8-Azapurines I: A Kinetic Analysis of 8-Azaxanthine Fluorescence.

A super-continuum white laser with a half-pulse width of ~75 ps was used to observe the kinetics of a postulated excited-state proton transfer in 8-azaxanthine and its 8-methyl derivative. Both compounds exhibited dual emissions in weakly acidified alcoholic media, but only one band was present in aqueous solutions, exhibiting an abnormal Stokes shift (>12,000 cm). It was shown that long-wavelength emissions were delayed relative to the excitation pulse within alcoholic media.

The relationship between PNP, GSTO-1, AS3MT and ADRB3 gene polymorphisms and urinary arsenic concentration among copper smelter and refinery employers.

Introduction: The aim of this study was to assess the relationship between polymorphisms of genes encoding enzymes involved in arsenic metabolism and urinary arsenic concentration in people occupationally exposed to arsenic.

Materials And Methods: The data from 113 employers directly exposed to lead, cadmium, and arsenic in copper smelter in Legnica and Glogow were collected. Urinary arsenic concentration was measured.