Study of dispersions prepared via pulsed laser abitation of metal titanium in water and peroxide water solutions

This work is devoted to the study of titanium dioxide dispersions prepared via pulsed laser ablation of metallic titanium in water and aqueous solutions of peroxide. The influence of the medium pulsed laser ablation and post-irradiation on the shape and size of particles, optical properties and also the stability of dispersions are estimated

Оценка риска и расчет времени эвакуации и блокировки эвакуационных выходов МБОУ СОШ № 2 г. Юрги

Цель работы – оценка индивидуального пожарного риска в здании средней общеобразовательной школе №2 города Юрги на соответствие нормативным значениям. В работе проведен литературный обзор по вопросам состояния проблем обеспечения пожарной безопасности в образовательных учреждениях и оценки рисков. Рассчитаны время эвакуации, время блокирования эвакуационных выходов опасными факторами пожара и индивидуальный пожарный риск. Разработана декларация пожарной безопасности.The aim of the work is to assess the individual fire risk in the building of the secondary school №2 of the city of Yurga for compliance with normative values. A literature review on the state of problems of providing fire safety in educational institutions and risk assessment was conducted. Time of evacuation, time of blocking of evacuation exits by dangerous factors of a fire and individual fire risk are calculated. A declaration of fire safety was developed

Assessing contamination levels of Laguna Lake sediments (Philippines) using a contact assay with zebrafish (Danio rerio) embryos

The present study investigated the suitability of a sediment contact assay using zebrafish (Danio rerio) embryos to evaluate the degree of lake sediment contamination. As endpoints, developmental parameters (mortality, abnormality, heart rate, and hatching rate) as well as stress protein responses (hsp 70 levels) in the developing embryos were recorded during a 96-h exposure. Fertilized zebrafish eggs were exposed to both the whole as well as organic extract concentrations prepared from collected sediments from 5 sites along Laguna Lake, Philippines. Compared to whole sediment exposure, more severe embryotoxic and teratogenic responses were elicited in embryos exposed to organic extracts. However, since whole sediment-exposed embryos also revealed significant developmental defects, this exposure phase served as the more realistic exposure scenario in our study. Weak to strong upregulation of hsp 70 levels was also registered among embryos exposed to both whole sediments and organic extracts. The observed embryotoxic and proteotoxic responses by zebrafish embryos to Laguna Lake sediment exposures were discussed in relation to the analyzed contaminants in the sediments (heavy metals, PAHs (perylene), solvent). Overall, the present study points out that the sediment contact assay with zebrafish embryos offers a practicable and highly sensitive bioassay for the general assessment of sediment toxicity