№ 1 (2017)

The article presents evaluation results of data of toxicological monitoring conducted by the Federal Center of Hygiene and Epidemiology of Rospotrebnadzor over the period of 2011-2015. In the Russian Federation during the analyzed period, 838,169 cases of acute poisonings of chemical etiology were registered, that is to say 111.5 to 120.8 cases per 100 thousand population, 17.2% of them were lethal. There is a trend of increase in acute poisonings of chemical etiology among adolescents. The main causes of acute chemical poisoning were alcoholcontaining products (32.1%).

Results of endoscopic diagnostics and treatment of 58 victims with chemical burns of airways are reported. They made 16.9% of observations of all patients admitted to hospital with poisonings by cauterizing substances. Endoscopic and X-ray semiotics of airways chemical burns is reported. The incidence and severity of airways lesions in relation to the degree of esophagus chemical burns were assessed. It is established that burn laryngotracheo bronchitis became complicated by the development of pneumonia in 77.6% of observations , and in 6.9% by cicatricial narrowing of the trachea and bronchi. Localization and the development speed of infiltrative changes in lungs allow to assume that the aspiration of cauterizing liquids plays the key role in the pneumonia genesis. The therapeutic bronchoscopy included toilet bronchoscopy of the trachea bronchial tree with 0.01% solution of dioxydin and laser photo stimulation with a red- range low-energy laser. Therapeutic sessions were carried out 3 times a week. From 1 to 10 sessions were performed depending on the severity of airways chemical burns. Convalescence of all patients was achieved.

Bioaccumulation and morphofunctional disorders induced by metal-containing nanoparticles were investigated on the example of potentially hazardous to health nanodispersed manganese and nickel oxides under various exposition conditions (particles size of 15-29 and 17-45 nanometers respectively). As a comparison, micro dimensional analogs which particles size was 300- to 1300- fold bigger were used. It was established that metalcontaining nanoparticles at intragastric and inhalation exposure had higher penetration power and low removal efficiency from the organism (14- to 39-fold lower); the profile of «critical» organs includes brain, liver, spleen, lungs; metal-containing NPs cause functional disorders in critical systems and target organs (in the form of disrupted balance in indicators of oxidative and antioxidant processes and neurotransmitters under effect of nano dispersed MnO), these disorders having dose-dependent character. A great degree of expressiveness of morphological changes in the blood circulatory system, macrophagal and lymphoid systems, and also the presence of changes in the tissue of liver, brain and heart not revealed under exposition to microdespersed analogs prove a big damaging ability of metal-containing nanoparticles and dependence of expressiveness degree of pathological process on the size of particles.

Behavioral responses in experimental animals were studied in an experiment after a single uptake of aqueous solution of mixed depleted uranium oxide using standard techniques. The experimental research showed pronounced integrative functions disorders in the rodents brain which are associated with impacts of uranium compounds on structures providing coordination of motor acts, on conditioned reflex activity as well as anxiety-phobic and emotional state of animals. Temporary neurotoxic effects of depleted uranium may be a result of both direct oxidant activity impact of uranium compounds on neurons and consequence of their effect on the neurotransmitter metabolism .

Changes in survival, fertility and metabolic activity in two generations of crustacean Daphnia magna in the piperonyl butoxide medium (PBO) were analyzed in concentrations of 50 to 800 ug/ml in a 21 day experiment in each generation. Metabolism disorders were evaluated using the MTT-assay traditionally applied in vitro to analyze cytotoxicity of medications. The MTT-assay shows in an integral way the amount of oxygen active forms, inactivation of mitochondrial oxidases, ratio of living and dead cells and function of antioxidant enzymes. It was found out that in the first generation, the PBO concentration of 353 ug/l is semi-lethal to Daphnia fertility and to the Daphnia survival it is 650 ug/l. In the second generation the toxic concentration is two-fold lower and amounts to 194 ug/l to fertility and to 200 ug/l to survival. It was revealed that PBO poses the cytotoxic effect on Daphnia.