Major Factors Affecting Incidence of Childhood Thyroid Cancer in Belarus after the Chernobyl Accident: Do Nitrates in Drinking Water Play a Role?

One of the major health consequences of the Chernobyl Nuclear Power Plant accident in 1986 was a dramatic increase in incidence of thyroid cancer among those who were aged less than 18 years at the time of the accident. This increase has been directly linked in several analytic epidemiological studies to iodine-131 (131I) thyroid doses received from the accident. However, there remains limited understanding of factors that modify the 131Irelated risk. Focusing on post-Chernobyl pediatric thyroid cancer in Belarus, we reviewed evidence of the effects of radiation, thyroid screening, and iodine deficiency on regional differences in incidence rates of thyroid cancer. We also reviewed current evidence on content of nitrate in groundwater and thyroid cancer risk drawing attention to high levels of nitrates in open well water in several contaminated regions of Belarus, i.e. Gomel and Brest, related to the usage of nitrogen fertilizers. In this hypothesis generating study, based on ecological data and biological plausibility, we suggest that nitrate pollution may modify the radiationrelated risk of thyroid cancer contributing to regional differences in rates of pediatric thyroid cancer in Belarus. Analytic epidemiological studies designed to evaluate joint effect of nitrate content in groundwater and radiation present a promising avenue of research and may provide useful insights into etiology of thyroid cancer

Study the Effect of Alloying of Mg on the Structure and Properties of Car Wheels Produced of AK12 Alloy

В статье рассмотрено влияние легирования магнием на структуру, механические свойства и устойчивость к разрушению при стендовых испытаниях автомобильных дисков колес из сплава АК12 для повышения свойств. Установлены взаимосвязи между концентрацией магния, структурой и свойствами дисков колес из исследуемого сплава. Выбран наиболее оптимальный химический состав сплава, позволяющий достигать повышенных свойствIn this article we examine the effect of alloying of magnesium on the structure, mechanical properties and resistance to fracture during bench test of car wheels produced of AK12 alloy to improve properties. Mounted interconnection between the of Mg content, structure and properties car wheels of the investigated alloy. Were optimized chemical composition of the alloy, which allows to achieve higher qualitie

Macroporous Hyaluronic Acid/Chitosan Polyelectrolyte Complex-Based Hydrogels Loaded with Hydroxyapatite Nanoparticles: Preparation, Characterization and In Vitro Evaluation

The aim of the study was to fabricate and characterize composite macroporous hydrogels based on a hyaluronic acid/chitosan (Hyal/Ch) polyelectrolyte complex (PEC) loaded with homogeneously distributed hydroxyapatite nanoparticles (nHAp), and to evaluate them in vitro using mouse fibroblasts (L929), osteoblast-like cells (HOS) and human mesenchymal stromal cells (hMSC). Hydrogel morphology as a function of the hydroxyapatite nanoparticle content was studied using scanning electron microscopy (SEM) and confocal laser scanning microscopy (CLSM). The mean pore size in the Hyal/Ch hydrogel was 204 ± 25 μm. The entrapment of nHAp (1 and 5 wt. %) into the Hyal/Ch hydrogel led to a mean pore size decrease (94 ± 2 and 77 ± 9 μm, relatively). Swelling ratio and weight loss of the hydrogels in various aqueous media were found to increase with an enhancement of a medium ionic strength. Cell morphology and localization within the hydrogels was studied by CLSM. Cell viability depended upon the nHAp content and was evaluated by MTT-assay after 7 days of cultivation in the hydrogels. An increase of the hydroxyapatite nanoparticles loading in a range of 1–10 wt. % resulted in an enhancement of cell growth and proliferation for all hydrogels. Maximum cell viability was obtained in case of the Hyal/Ch/nHAp-10 sample (10 wt. % nHAp), while a minimal cell number was found for the Hyal/Ch/nHAp-1 hydrogel (1 wt. % nHAp). Thus, the proposed simple original technique and the design of PEC hydrogels could be promising for tissue engineering, in particular for bone tissue repair

Brilliant Scientist, Educator and Organizer. The 75-Year Anniversary of Professor, Doctor of Technical Sciences V.S. Biront

В мемориальной статье, посвященной 75-летнему юбилею профессора, доктора технических наук В.С. Биронта (1937-2011), представлены основные направления научной работы выдающегося металловеда Сибири, его яркой педагогической и организаторской деятельности.Memorial article on 75-year anniversary of the Professor, doctor of technical sciences V. S. Biront (1937-2011) presented the main directions of scientific work of outstanding metallographer of Siberia, its shining pedagogical and organisational activities

Brilliant Scientist, Educator and Organizer. The 75-Year Anniversary of Professor, Doctor of Technical Sciences V.S. Biront

В мемориальной статье, посвященной 75-летнему юбилею профессора, доктора технических наук В.С. Биронта (1937-2011), представлены основные направления научной работы выдающегося металловеда Сибири, его яркой педагогической и организаторской деятельности.Memorial article on 75-year anniversary of the Professor, doctor of technical sciences V. S. Biront (1937-2011) presented the main directions of scientific work of outstanding metallographer of Siberia, its shining pedagogical and organisational activities

Development of Annealing Conditions wire Rod Alloy of Al-Zr System to Reach Required Properties

В статье рассмотрено влияние непрерывного и ступенчатого отжига на удельное электрическое сопротивление и механические свойства катанки из малолегированных сплавов системы Al-Zr для достижения заданного уровня свойств. Установлена связь между концентрацией легирующих элементов, структурой и свойствами катанки из исследуемых сплавов. Разработан и рекомендован для внедрения на предприятиях алюминиевой промышленности ступенчатый режим термической обработки, позволяющий получать катанку с соответствующим уровнем свойств международного стандартаIn this article was considered the influence of continuous and stepped annealing on resistivity and mechanical properties of dilute alloy wire rod of a Al-Zr system for reaching of required properties. There was determined the connection between concentrations of alloying elements, structure and properties of investigated alloys wire rod. The stepped heat treatment conditions was developed and recommended for application at the factories of aluminum industry, that allows producing wire rod with properties of international standard

Study the Effect of Alloying of Mg on the Structure and Properties of Car Wheels Produced of AK12 Alloy

В статье рассмотрено влияние легирования магнием на структуру, механические свойства и устойчивость к разрушению при стендовых испытаниях автомобильных дисков колес из сплава АК12 для повышения свойств. Установлены взаимосвязи между концентрацией магния, структурой и свойствами дисков колес из исследуемого сплава. Выбран наиболее оптимальный химический состав сплава, позволяющий достигать повышенных свойствIn this article we examine the effect of alloying of magnesium on the structure, mechanical properties and resistance to fracture during bench test of car wheels produced of AK12 alloy to improve properties. Mounted interconnection between the of Mg content, structure and properties car wheels of the investigated alloy. Were optimized chemical composition of the alloy, which allows to achieve higher qualitie

Development of Annealing Conditions wire Rod Alloy of Al-Zr System to Reach Required Properties

В статье рассмотрено влияние непрерывного и ступенчатого отжига на удельное электрическое сопротивление и механические свойства катанки из малолегированных сплавов системы Al-Zr для достижения заданного уровня свойств. Установлена связь между концентрацией легирующих элементов, структурой и свойствами катанки из исследуемых сплавов. Разработан и рекомендован для внедрения на предприятиях алюминиевой промышленности ступенчатый режим термической обработки, позволяющий получать катанку с соответствующим уровнем свойств международного стандартаIn this article was considered the influence of continuous and stepped annealing on resistivity and mechanical properties of dilute alloy wire rod of a Al-Zr system for reaching of required properties. There was determined the connection between concentrations of alloying elements, structure and properties of investigated alloys wire rod. The stepped heat treatment conditions was developed and recommended for application at the factories of aluminum industry, that allows producing wire rod with properties of international standard