RESUMO
AuAl2 is an intermetallic compound with a vivid purple colour attributable to a bulk plasmon energy in the visible part of the spectrum. However, the colour of as-deposited thin films is not as strong and only develops upon annealing. Density functional theory calculations of the dielectric function are presented for a variety of vacancy types and concentrations. The results support the view that the effect of annealing on colour is correlated with a reduction in concentration of Al vacancies. The effect of vacancies on the optical properties can be understood as arising from the complex interplay between interband transitions around the Fermi level and the plasmon energy.
RESUMO
We report an infant with Factor XIII deficiency who had 2 seemingly spontaneous intracranial hemorrhages. It is important to consider Factor XIII deficiency as a possible cause of unexplained intracranial hemorrhages in infancy. Ongoing factor replacement therapy is recommended to prevent further bleeding episodes.
Assuntos
Hemorragia Cerebral/sangue , Deficiência do Fator XIII/complicações , Testes de Coagulação Sanguínea , Hemorragia Cerebral/diagnóstico , Pré-Escolar , Deficiência do Fator XIII/diagnóstico , Seguimentos , Hematoma Subdural/sangue , Humanos , Lactente , Masculino , Hemorragia Subaracnóidea/sangue , Tomografia Computadorizada por Raios XRESUMO
Experimental analysis of the pressure changes in the respiratory cavities of the American winter flounder Pseudopleuronectes americanus, together with electromyographic recordings of key respiratory muscles and cineradiographic observations of the distribution of radioopaque dye, have revealed unequivocally that the respiratory current and underlying mechanisms are symmetrical. The respiratory apparatus, as in other teleosts, is driven by bilaterally symmetrical alternating buccal pressure and opercular suction pumps. An elaborate deflecting apparatus is present in the respiratory cavities of flatfishes to maximize the irrigation of gills of both sides. Functional symmetry is maintained in the morphologically asymmetrical flatfishes and a high premium is put on the bilateral distribution and opercular ejection of the respiratory current during the evolutionary radiation of the Pleuronectiformes.
