RESUMEN
Up-to-date crystalline silicon production is characterized by such leading occupational hazards as higher level of dust with complicated chemical composition, aerosols that vary with technology and derive from disintegration of silica, crystalline silicon or condensation of silica. Experiments comparing prevalence of diseases caused by silica and crystalline silicon dusts in acute and chronic intratracheal administration and inhalation identified crystalline silicon as moderately fibrogenic and specified its MAC at 4 mg/m3 in the air of workplace.
Asunto(s)
Polvo/efectos adversos , Exposición Profesional/efectos adversos , Silicio/efectos adversos , Silicosis/etiología , Silicosis/prevención & control , Industria Química , Humanos , Federación de RusiaRESUMEN
Among multiple and various functions of the body, motor activity is essential. But it is little studied in schoolchildren. The present study was undertaken to investigate the impact of industrial pollution of the ambient air on the motor activity in old schoolchildren. At school, the motor activity of 8th-, 10th-, and 11th-form schoolchildren was found to decrease with age, the dynamics of its decrease was determined by not only sexual differences of pupils, but also by the technogenic ambient air pollutions.