RESUMEN
Pervaporation separation of chlorinated hydrocarbon/acetone mixtures has been investigated using nanoclay modified poly(ethylene-co-vinyl acetate) films. The results have been compared with the unfilled poly(ethylene-co-vinyl acetate) films. The nanoclay modified membranes were characterized by X-ray diffraction technique. The dispersion of layered silicates in the polymer matrix was analyzed using transmission electron microscopy. The nanoclay showed excellent dispersion in the polymer matrix. The effect of free volume on the pervaporation performance was investigated by positron annihilation lifetime spectroscopy. Poly(ethylene-co-vinyl acetate) nanocomposite membrane showed high selectivity because of the plateletlike morphology and high aspect ratio of layered silicates. The nano clay content and the swelling effects on pervaporation performance of nano composite membranes have been investigated in detail.
RESUMEN
Wegener's granulomatosis (WG) is a rare systemic disease characterized by necrotizing granulomatous inflammation of the upper and lower respiratory tract, glomerulonephritis and vasculitis. It occurs as a limited form or generalized form and usually presents with nonspecific symptoms in its early stages, making the diagnosis of this disease more elusive. Strawberry gingivitis is the most common oral manifestation and is characteristic. Prompt recognition of this early manifestation is of utmost importance for the institution of early treatment, thereby avoiding serious complications. The present paper selectively reviews the literature regarding the current status of WG with respect to diagnosis, laboratory features, and treatment.
Asunto(s)
Atención Dental para Enfermos Crónicos , Gingivitis/etiología , Granulomatosis con Poliangitis , Antiinflamatorios/uso terapéutico , Anticuerpos Anticitoplasma de Neutrófilos/sangre , Ciclofosfamida/uso terapéutico , Gingivitis/diagnóstico , Granulomatosis con Poliangitis/sangre , Granulomatosis con Poliangitis/complicaciones , Granulomatosis con Poliangitis/diagnóstico , Granulomatosis con Poliangitis/tratamiento farmacológico , Humanos , Inmunosupresores/uso terapéutico , Úlceras Bucales/etiología , Prednisona/uso terapéutico , Prevención SecundariaRESUMEN
Salivary duct carcinoma is a rare high-grade neoplasm that more frequently affects the parotid gland. Though neoplasms of this type are infrequent in minor salivary glands, they are less aggressive and may lead to early diagnosis before distant metastases could occur. Salivary duct carcinoma is also the most frequent epithelial component of carcinosarcoma. The present article reports a case of SDC of the palate in a 26-year-old male and discusses SDC as a malignant epithelial component in carcinosarcoma.