RESUMEN
Coal combustion, which is one of the most important energy sources of electricity generation, produces airborne pollutants: NOx, CO2, SO2, particulates and Hg°. A range of technologies is being developed to reduce the environmental impact of coal-fired power stations. No optimal technology that can be broadly applied exists as yet, but sorption of mercury is considered a promising approach. We report a novel adsorbent, which shows an extraordinary mechanical resistance and high adsorption capacity of mercury vapour. These adsorbent samples were synthesized in the gas sulphonitriding process using steel sheets. The chemisorption capacity of the sorbent materials, the process of the thermal desorption of mercury and the effect of the hydrogen activation treatment have been investigated in the work. It has been established that the capacity of mercury chemisorption increased more than twice after the heating treatment of the adsorbent in H2 atmosphere at 500 °C in comparison with the non-activated one. The mechanism of activation has been elucidated in the paper. For the purpose of comparison, activated carbon was also investigated.
RESUMEN
The studies comprised 41 patients, aged 18-67, with type I and II diabetes. The function of ocular muscles was evaluated basing on the examination of eye movements, muscles balance and binocular vision. In 6 patients, binocular vision and in 31 ocular muscles balance were disturbed. No relationship was found between the function of eye muscles and the age of patients, duration of diabetes and changes in the fundus of the eye.
Asunto(s)
Diabetes Mellitus/fisiopatología , Músculos Oculomotores/fisiología , Visión Binocular/fisiología , Adolescente , Adulto , Factores de Edad , Anciano , Femenino , Humanos , Masculino , Persona de Mediana EdadRESUMEN
The authors presented a case of a boy aged 16, in whom xeroderma pigmentosus was diagnosed 6 years earlier. The boy was referred to the clinic on account of a quickly growing tumor of conjunctiva and cornea of his right eye. During 2-year follow-up, in spite of two surgical excision, the tumor relapsed and finally enucleation of the eyeball was performed. Histopathological examination revealed melanoma malignum. The clinical aspects of prophylaxis, early diagnosis and treatment of xeroderma pigmentosum are discussed.