Evaluation of metal content in perch of the Ob River basin

The geochemical features of river perch in the River Ob basin have been studied (the upper and middle reaches of the Ob River and the lower reach of the Tom River). The contents of Ag, Bi, Cd, Co, Cr, Cu, Fe, Mn, Mo, Ni, Pb, Sn, W, Zn, Hg in perch's soft tissue are defined by the methods of ICP AES and stripping voltammetry, that of mercury in bones - by the atomic absorption method using mercury analyzer РА-915+. The distribution series of metal absolute concentrations in perch's soft tissue from the Ob River basin are plotted: Fe > Zn > Cu > Mn, typical for uncontaminated or slightly metal contaminated water bodies. In soft tissue of the studied samples the metal content does not exceed the permissible values. The mercury content in bones of studied samples is in the range 0,036-0,556 mg/kg. The mercury concentration is higher in bones in comparison with soft tissue in all samples

ON THE ISSUE OF THE STUDY OF AUTOBIOGRAPHICAL MEMORY

  Objective: The article focuses on the topical problem of the functioning of autobiographical memory, which is considered as a higher mental function. The aim of the research is to study autobiographical memory of people of different age groups using the method of free recall of events.Methods: The main parameters of the analysis are as follows: Memories peak,†subjective importance of the events and dynamics of autobiographical memory.Results: The research results suggest that positive experiences dominate in the structure of autobiographical memory. This may indicate psychological protective mechanisms of a person. The dynamics of autobiographical memory is observed in all age groups. This results in changing the evaluation of events. This can be explained by a change in personality, the transformation of values, interests and moral principles of a person.Conclusion: The study revealed that subjects of all age groups primarily remember old events and, last of all, the events of the recent past

Effect of the Stress State on the Adhesive Strength of an Epoxy-Bonded Assembly

The paper studies the adhesive strength of aluminum alloy specimens bonded with the use of an epoxy adhesive, under the tensile-shear stress state, depending on the testing temperature. Tension of modified Arcan specimens with load angles of 0, 22.5, 45, 67.5, and 90° with respect to the plane of adhesion is chosen as the experimental method. Experiments were performed at temperatures of −50, +23, and +50 °С. The analysis of the obtained results yields a linear fracture criterion and a fracture locus for the adhesive failure strain energy density, which takes into account the ratio of the elastic properties of the adhesive to those of the substrate. The region bounded by the fracture loci of adhesive strength and ultimate strain energy density determines the conditions for the safe loading of the bonded assembly in terms of the energy and force criteria of adhesive failure. The proposed fracture loci can be used, preferably simultaneously, to estimate the in-service strength and reliability of adhesively bonded assemblies

Public Health Risk Conditioned by Chemical Composition of Ground Water

The article studies the public health potential risk originated from water consumption and estimated on the basis of the groundwater chemical composition. We have processed the results of chemical groundwater analysis in different aquifers of Tomsk district (Tomsk Oblast, Russia). More than 8400 samples of chemical groundwater analyses were taken during long-term observation period. Human health risk assessment of exposure to contaminants in drinking water was performed in accordance with the risk assessment guidance for public health concerning chemical pollution of the environment (Russian reference number: 2.1.10.1920-04-M, 2004). Identified potential risks were estimated for consuming water of each aquifer. The comparative analysis of water quality of different aquifers was performed on the basis of the risk coefficient of the total non-carcinogenic effects. The non-carcinogenic risk for the health of the Tomsk district population due to groundwater consumption without prior sanitary treatment was admitted acceptable. A rather similar picture is observed for all aquifers, although deeper aquifers show lower hazard coefficients

Public Health Risk Conditioned by Chemical Composition of Ground Water

The article studies the public health potential risk originated from water consumption and estimated on the basis of the groundwater chemical composition. We have processed the results of chemical groundwater analysis in different aquifers of Tomsk district (Tomsk Oblast, Russia). More than 8400 samples of chemical groundwater analyses were taken during long-term observation period. Human health risk assessment of exposure to contaminants in drinking water was performed in accordance with the risk assessment guidance for public health concerning chemical pollution of the environment (Russian reference number: 2.1.10.1920-04-M, 2004). Identified potential risks were estimated for consuming water of each aquifer. The comparative analysis of water quality of different aquifers was performed on the basis of the risk coefficient of the total non-carcinogenic effects. The non-carcinogenic risk for the health of the Tomsk district population due to groundwater consumption without prior sanitary treatment was admitted acceptable. A rather similar picture is observed for all aquifers, although deeper aquifers show lower hazard coefficients

Informational characteristics of microbial biofilms formed by clinical strains of Klebsiella pneumoniae in vitro on the surface of the cover glass

Purpose Obtaining quantitative and informational characteristics of biofilms formed by clinical strains of Klebsiella pneumoniae in vitro on the surface of a cover glass. Materials and methods In vitro biofilm formation on the surface of the cover glass was studied for clinical Klebsiella pneumoniae strains, isolated in a monoculture (ESBL +) (n = 3) and in associations with Staphylococcus aureus (n = 6) in 9 patients with chronic osteomyelitis of long bones harvrested from fistulae in the preoperative period or from the infection focus during surgery. Results Monocultures of K. pneumoniae (BLRS +) differed by their lower adhesive ability when compared to strains of K. pneumoniae isolated from associations with S. aureus. The highest adhesive activity on the surface of the cover glass was observed in a mixed culture of K. pneumoniae + S. aureus. Informational characteristics depended on the type of biofilms formed. Common to biofilms was the absence of changes in the maximum possible structural diversity. Significant differences between the existing structural diversity of biofilms formed by monocultures of K. pneumonia, K. pneumonia isolated from associations and a mixed culture of K. pneumoniae + S. aureus were noted. Conclusion The absence of pronounced variability of information indicators during the experiment within each microbial community indicates the tendecy of all systems of emerging biofilms to preserve stabilit

Mercury content in soils on the territory of Mezhdurechensk

The geochemical features of mercury content and distribution in the zone of coal producers have been studied (Mezhdurechensk town). Mercury content in soil (30 samples) was determined by atomic absorption method using mercury analyzer PA-915+ with pyrolytic device. Mercury content in soil samples changed from 0.12 to 0.17 mg/kg, the average value being 0.057 mg/kg. Within the town territory five zones with mercury elevated concentrations in soil were distinguished. 25-year observation period showed a 2.8 time decrease in average mercury content in soil. The major contribution to soil pollution in the urban territory was made by the two factors: local and regional. The mercury content in soil is affected by the emissions from boilers operating on coal as well as coal dust from the open pits near the town

Профессионал и личность. Юбилей Л. М. Иньковой

Authors confide memories of a life and professional work of Ludmila Inkova, the editor-in-chief of journal “Soviet library science”.Авторы статьи делятся воспоминаниями о жизни и профессиональной деятельности главного редактора журнала «Советское библиотековедение» Людмилы Иньковой

Fluorine concentration in snow cover within the impact area of aluminium production plant (Krasnoyarsk city) and coal and gas-fired power plant (Tomsk city)

The fluorine contents in snow melt water find in the impact areas of aluminum production plant and coal and gas-fired power plant are compared. In melt water, soluble fluoride is found in the form of fluoride ion, the content of which was determined by the potentiometric method using ion-selective electrode. According to the measurements of 2013-2014, fluoride content in melt water ranges 10.6-15.4 mg/dm{3} at the distance 1-3 km from the borders of Krasnoyarsk aluminum plant with the mean value 13.1 mg/dm{3}. Four-year monitoring from 2012 to 2015 in the impact area of Tomsk coal and gas-fired power plant showed that fluoride content in melt water in vicinity of the thermal power plant is significantly lower than in the samples from the impact area of the aluminum plant. But higher content of fluoride ion (0.2-0.3 mg/dm{3}) in snow samples in vicinity of coal and gas-fired power plant was revealed in winter of 2015. Intake of soluble fluoride is mostly explained by dust-aerosol emissions of study plants and deposition of fluorine compounds from air