Vol 96, No 6 (2017)

Anthropogenic forcing has a huge impact on the formation of the ecosystem of modern cities, including the composition of the mycobiota of the urban environment. The paper presents the results of mycological studies of soil samples taken in the city of Kazan in areas divided into recreational and transport functional areas with different levels of anthropogenic load. More than 60 species of fungi belonging to 15 genera, including 20 species common to soils in both zones were identified. Penicillium sp., Fusarium sp., Rhizomucor sp., Trichoderma viride were shown to dominate in undisturbed natural areas, and in soils of the urban environment there was much more often found the presence of Alternaria sp., Aspergillus sp., Candida sp., Rhizopus sp., Trichophyton sp. In areas with good natural light the percentage of samples with low contamination by fungi was established to be significantly higher than in shaded areas: 16.7% and 7.1% in the recreational area; and 12.5% and 0% in the transport zone correspondingly. Potentially pathogenic species of fungi were detected in 80% of samples of recreational and in 95% of samples of transport areas. Dark-colored species (including Aspergillus, Alternaria, etc.) were shown to be more common in soils of transport zone, and Trichophyton sp. and Scopulariopsis sp. — in soils of recreational zone. The evaluation of mycological hazard index allowed to estimate the condition of the soil of Kazan as satisfactory for 80% of sites of recreational and 65% — of the transport area. The average value of the mycological hazard index for recreational areas was 2.7 and for the transport areas - 4.2. Results indicate to regular mycological monitoring would be desirable for the normalization of the mycological environment, significantly reducing the risk of mycosis, mycotoxicosis and mycogenic allergies, and should help to ensure sanitary-epidemiological welfare of the population.

Jewish Autonomous Republic is a region of the Russian Federation associated with the high radon risk. The highest levels of radon concentration, more than 200 Bq/m³ (MPC 100 Bq/m³) were registered in the Obluchensky district and in the capital of autonomy — city of Birobidzhan. One-floor stone houses have the biggest content of radon (in units EEVA radon) in the air.

Currently in the world there is no universal scientifically based criteria system aimed at assessing the dangers of waste. There are two waste classification systems adopted in Russia: SP 2.1.7.1386-03 on the degree of the impact on the environment and human health wastes are divided into 4 hazard classes; Criteria of the Ministry of Natural Resources and Environment (MNRE) of the Russian Federation on the degree of the negative impact of wastes on the environment are divided into 5 classes of danger. In the Russian practice in all areas of toxicology and health care, in justifying the MAC in the fishery waters 4 classes of dangerous substances are used. The least dangerous substances are referred to class 4 of danger, “a little dangerous.” Any chemical substance under certain conditions can have adverse effects on human health and nature. Introduction of hazard class V in Criteria MPR is contrary to the generally accepted concepts and practice of evaluation of substances. Examples of differences in the contents of two documents are given, indicating the intention of the authors of MPR Criteria to reduce the requirements for waste treatment conditions. The MNRE Criteria miss the very concept and method of the evaluation of substances that have carcinogenic properties. The SP 2.1.7.1386-03 in case of the presence in waste of substances with proven carcinogenicity for humans, assigns to the waste component the highest value of the danger index, other indices may not be considered. This approach is not proposed in MNRE Criteria. They completely ignore results of basic research, which showed the lack of the regular toxicity relationship for bioassays and mammals. MNRE criteria cannot be regarded as the only document on the determination of the waste hazard class. It is necessary to create a universal document to determine the hazard class of waste in production and consumption, ensuring safe conditions of human life and protection of the natural environment.

Ultraviolet disinfection is the most efficient mode in combination with other disinfection methods within multi-barrier approach for the water treatment. UV disinfection being effective against a wide range of pathogens including the chlorine-resistant (viruses and protozoa) significantly reduces chlorine byproducts. This paper presents a review of results of the implementation of multi-barrier lay-out with the application of UV disinfection at water and wastewater treatment plants of large cities: St. Petersburg and Nizhniy Novgorod.

This review in chronological order considers steps of the solution of the one of key issues of occupational medicine, namely - a hygienic assessment of working conditions at enterprises of gas-processing industry - the most steadily growing sector of economy, reliably providing the population’s needs and the national economy for fuel and energy resources. The intensity of the working process at these enterprises was shown to be often associated with the persistent exposure to various harmful factors of the occupational environment that in the complex promotes the formation of unfavorable functional states, a decline in the level of physical and mental health, productivity and efficiency of work. Industrial air environment in services workshop and compressor houses is often polluted with hydrogen sulphide, sulfur dioxide, mercaptans, methanol, saturated and unsaturated hydrocarbons, nitrogen and carbon oxides. The main cause of this pollution is a certain imperfection of the technological process and equipment, especially the lack of its tightness. The number of processes at a high temperature and elevated pressure in the presence of very aggressive reagents primarily, as hydrogen sulfide and sulfur dioxide promotes the release of harmful substances into air environment. The possibility of their additive or synergistic impact on employees is not excluded because just in such industries there is seen a number of combinations of harmful substances enforcing the action of each other. There is made a conclusion that working conditions and environmental protection at the enterprises for the processing of natural gas and condensate with the high content of hydrogen sulfide and other corrosive components need for the further comprehensive hygienic assessment with the aim of the development of measures for the improvement of working conditions, preservation of workers’ health and environmental protection at all stages of production and processing of hydrocarbon raw materials in modern conditions.

In preparing the review, the Scopus and Russian Information Scientific Center databases were used.

There were studied working conditions and the state of the muscular-skeletal system in employees of the oil industry. Working conditions of employees of basic occupations are referred to the hazard Class 3.1–3.3. Significant physical exertion with the predominant load on the lumbar-sacral area, constrained posture, the exposure to the general vibration and adverse weather conditions contribute to the development of diseases of the muscular-skeletal and peripheral nervous system. The most perspective trend in solving problems of diseases of the muscular-skeletal system is the implementation of the complex of preventive measures including both primary and secondary prophylaxis.

Introduction. Currently, there is a deterioration trend in the health of the younger generation, in particular, an increasing number of persons with functional disorders of the cardiovascular system. Regarding this it is important to develop an comprehensive approach to the study of the circulatory indices in the young age with informative clinical diagnostic techniques and new ways to analyze the data.

Material and methods. Heart rate variability (HRV) indices in 200 students at rest and during exercise were studied. For a more complete assessment of the functional reserves of cardiovascular system after the load the index of the normal heart rhythm restoration (SDNN) was calculated. Moreover, we built logistic models and curves of the operating characteristics.

Results. At rest, no significant differences in indices of both HRV and autonomic regulation of heart rate have been identified between boys and girls aged of 16-18 years. Students of the different gender, aged of 19-22 years showed significant differences in spectral parameters of HRV, there was noted the dominance of the sympathetic component of heart rate regulation in boys and parasympathetic — in girls. In terms of physical activity in undergraduate students there is observed mainly the activation of vagal influences on the heart, in senior students the vegetative balance shifted to the direction of the increased activity of mechanisms of the sympathetic regulation. The revealed decrease of NHRR reflects the low level of the reserve capacity of the cardiovascular system in  41% out of observed students. Part of students with an increased probability of the reduction of functional cardiac disorders accounted for 42% of boys and 39% of girls among students aged 16-18 years and 36% of boys and 44% of girls among students aged of 19-22 years.

Conclusion. There is a change in the nature of autonomous regulation of heart rate in students of different gender and ages from 16-18 to 19-22 years. The optimal cardiac response to stress test is observed at low baseline values of heart rate and the prevalence of the parasympathetic part of the autonomic regulation of the heart rate at rest. To assess the functional reserve of the cardiovascular system in HRV indices we recommend the calculation of NHRR and the analysis of the SDNN coefficient for the effective prediction of heart rate recovery rate after exercise testing.

We studied the effect of Internet addiction on the emotional symptoms (anxiety, aggressiveness and emotional stability) adolescents, and parental attitude to the problem of Internet addiction and Internet safety. The study involved 116 adolescents (13-14 years) and 120 parents. It was found that the level of self-evaluation, interpersonal, school and General anxiety in adolescents with Internet addiction are significantly higher than adolescents that do not have addiction. The level of aggression in adolescents with Internet addiction above the norm by 2,5 times. Adolescents with Internet addiction, three times more likely to have a low level of stress. Parents of teenagers did not know the basics of prevention of Internet addiction in their children and do not pay particular attention to the formation of information-psychological security on the Internet.

There were summarized data on epidemiology and the properties of several groups of viral diseases, actually or potentially capable of implementation of the food route of transmission of infection (noroviruses, hepatitis viruses A and E, adenoviruses, astroviruses, rotaviruses, “avian” and “swine” flu viruses). There were mentioned most well-known massive outbreaks of enterovirus infections in countries of South-East Asia, India, China, Europe and other regions. The importance of products of animal and vegetable origin, and also water biological resources as factors of transmission of viral infections are shown. The analysis of available methods of detection of foodborne viruses shows the execution of analysis to demand for matching of methods for extraction and concentration of samples. An important criterion of the suitability of the used variant of the extraction must be its compatibility with demands for molecular methods — the minimum number of stages of sample processing with chemical reagents, neutral pH, preservation of antigenic properties and the intact viral RNA of pathogen. With consideration of the genetic diversity of food viruses, their detection requires the assortment of effective combinations of several types of primers, probes and conditions for the amplification. The methods of the rapid control should be based on the use of most modern types of analysis, including multi-primer PCR, hybridization on nucleotide microchips, immunochromatography and ELISA. Prior to the introduction into the practice, internal and external comparative tests of express methods should be executed to confirm their resolution and interlaboratory reproducibility. The introduction of comprehensive methods for the analysis of food viruses, the creation of a monitoring system on their basis, including the order and organization of research, the collection and exchange of information by competent organizations in real time regimen, can significantly increase the effectiveness of investigating outbreaks of viral infections with food transmission, reduce the risk of cross contamination in food enterprises, reduce the likelihood of using raw materials contaminated with viral pathogens in the production process, and improve the safety of food products