For nanodimensional magnetically inhomogeneous amorphous granular films of the system (Co 84 Nb 14 Ta 2 ) x (SiO 2 ) 100−x , 30 ≤ x ≤ 60 at.% the concentration dependences of the magnetooptical Kerr effect (MOKE) spectra and FMR have been investigated. The observed changes in the MOKE and FMR spectra are associated with transformations of microstructure and topology of the nanocomposites. For the compositions within the percolation region the transversal Kerr effect increases by an order of magnitude.
-The optical and magnetooptical properties of the new granular nanocomposites (CoFeB)/(SiO 2 ) and (CoFeZr)/(Al 2 O 3 ), which are grains of amorphous ferromagnetic alloys embedded in dielectric matrices, have been studied. The dependence of the optical, magnetooptical, and magnetic properties of the nanocomposites on their qualitative and quantitative composition, as well as on the conditions of their preparation, was investigated. Spectra of the dielectric functions ε = ε 1 -i ε 2 were obtained by the ellipsometric method in the range 0.6-5.4 eV. Above 4.2 eV, the absorption coefficient of the (CoFeB)/(SiO 2 ) composites was found to be close to zero for all magnetic-grain concentrations. The polar Kerr effect measured at a photon energy of 1.96 eV in dc magnetic fields of up to 15 kOe reaches values as high as 0.25 ° -0.3 ° for these nanocomposites and depends only weakly on the conditions of preparation. On the other hand, the (CoFeZr)/(Al 2 O 3 ) nanostructures reveal a considerable difference in the concentration dependences of the Kerr effect between samples prepared in a dc magnetic field and in zero field.
Objetivo: Descrever um caso de clínico de osteonecrose dos maxilares associada ao uso de bifosfonatos, bem como suas características clínicas e conduta adotada. Detalhamentos de Caso: Paciente do sexo feminino, 67 anos, compareceu ao serviço de Estomatologia devido à presença de lesão em maxila. Na história médica relatou ser diabética e hipertensa, além de fazer o uso de tratamento para osteoporose há 4 anos, com Alendronato de Sódio. Ao exame físico, foram observadas áreas necróticas com extensa exposição óssea em rebordo maxilar. Inicialmente foi proposto tratamento conservador, com bochechos diários com Clorexidina 0,12% e acompanhamento mensal, pois a paciente não relatou sintomatologia e não apresentou sequestro ósseo. No entanto, cinco meses após, o osso encontrou-se sequestrado, sendo então necessária a realização da intervenção cirúrgica. Considerações finais: A osteonecrose dos maxilares pode ocorrer devido ao uso prolongado de bifosfonatos. É de fundamental importância o correto diagnóstico pelo cirurgião-dentista, reforçando a orientação àqueles pacientes submetidos ao tratamento com essa classe de medicamentos, visando à prevenção da doença.
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