RESUMO
Kimura disease (KD) is a chronic inflammatory disorder, which is quite rare and has an unclear and much debated etiology. KD is characterized by painless, nodular, subcutaneous swellings along with lymphadenopathy, encountered in the head and neck region more often. It is also known to affect major salivary glands. It is also associated with elevated Immunoglobulins (IgE) and peripheral blood and tissue eosinophilia. Kimura disease generally affects young Asian males. There is considerable difficulty in arriving at clinical diagnosis and often it is frustrating to both patients and the treating physicians because of the difficulty in its management. We are presenting and reporting a case of Kimura disease in a young adult Indian female patient who presented with a swelling in the left parotid region. We have successfully managed this patient medically with a unique combination of drugs, most of which have already been tried and reported in literature by various authors.
RESUMO
A liquid dielectric based on a core-shell architecture having a superparamagnetic iron oxide core and a shell of silicon dioxide was synthesized. The frequency dependence of dielectric properties was evaluated for different concentrations of iron oxide. The dependence of magnetic field on the dielectric properties was also studied. Aqueous ferrofluid exhibited a giant dielectric constant of 6.4 × 105 at 0.1 MHz at a concentration of 0.2 vol% and the loss tangent was 3. The large rise in dielectric constant at room temperature is modelled and explained using percolation theory and Maxwell-Wagner-Sillars type polarization. The ferrofluid is presumed to consist of nanocapacitor networks which are wired in series along the lateral direction and parallel along longitudinal direction. On the application of an external magnetic field, the chain formation and its alignment results in the variation of dielectric permittivity.
