RESUMEN
The aim of this study is to apply the (252)Cf-PDMS (plasma desorption mass spectrometry) technique to characterize particles deposited in ice samples. This technique allows identification of molecular ions, even large molecules, desorbed from the sample surface, in contrast with PIXE (particle induced X-ray emission) or EDS (energy dispersive spectrometry). Two shallow snow cores obtained from different glacial drainage basins on King George Island ice cap, South Shetland Islands (Antarctica), were analyzed by PDMS. The chemical compounds identified in the ice mass spectra show that the particle contents of both samples were statistically different, indicating a non-homogeneous spatial deposition distribution for the deposited particles. The analysis of the ice mass spectra suggests some possible sources for the airborne particles. The mass spectra of ice samples collected at a site exposed directly to air masses coming from the Drake Passage show a significant contribution of particles from crustal and anthropogenic sources. However, the mass spectra of ice samples taken from a site on a slope towards a local inlet point out a high influence of marine aerosol. Therefore, it was concluded that particles deposited onto the ice cap were attributable to different aerosol sources, besides long-range atmospheric transport. The (252)Cf-PDMS technique can be considered a powerful tool for studies of snow and ice samples, providing important information for understanding the global atmospheric transport and deposition of airborne particles.
RESUMEN
Relatamos um caso de Fasciíte Necrotizante da regiäo cérvico-facial após abcesso dentário, em um paciente portador de Diabetes melito descompensado. Esta infecçäo aguda resultou numa invasividade profunda com necrose da fáscia, gordura subcutânea e pele da regiäo cervical. O sucesso do tratamento baseou-se no diagnóstico precoce da doença básica, na terapia antibiótica de largo espectro e no desbridamento agressivo
Asunto(s)
Humanos , Masculino , Adulto , Absceso , Fascitis Necrotizante , Diabetes Mellitus , PenicilinasRESUMEN
Paciente de 52 anos submetida a transplante cardíaco ortotópico em maio de 1991, tendo apresentado como complicaçäo tardia o surgimento de carcinoma epidermóide de amígdala. O diagnóstico inicial foi de neoplasia metastática de sítio primário desconhecido porque o tumor primário somente manifestou-se após 6 meses do surgimento da metástase à distância. A incidência de neoplasia no primeiro ano pós-transplante cardíaco é pouco freqüente, assim como o carcinoma epidermóide de amígdala na populaçäo normal. Näo encontramos relato de caso na literatura entre pacientes submetidos a transplante cardíaco e apresentando carcinoma epidermóide de amígdala.