Résumé
Objective To investigate the preparation method of hydroxyapatite by amino acids induced hydrothermal technique.Methods The hydroxyapatite nanorods were obtained using alanine and glycine as templates by hydrothermal method.The samples were characterized by X-ray diffraction (XRD),Fourier infrared spectroscopy (FTIR),transmission electron microscopy (TEM).Results The results showed that amino acids induced the formation of hydroxyapatite.Amino acids could affect crystallinity and dispersion of the formed hydroxyapatite.In addition,the substituent content of carbonate ions in hydroxyapatite was reduced by changing the ratio of amino acids.Conclusion Hydroxyapatite with high crystallinity and low carbonate ions can be prepared by hydrothermal method in the presence of amino acids.
Résumé
Objective To improve imaging diagnosis of Wegener granulomatosis.Methods Ten cases with Wegener granulomatosis were collected and their imaging findings were analyzed retrospectively.Results Eight cases presented sinusitis. CT showed mucosa thicken, accompanied with the destruction of middle-line structure in 3 cases and orbit mass in 2 cases. Seven cases involved lungs. Pulmonary imaging were complicated, showing multiple nodules or masses in 3 cases and multiple variable signs in the others. One case showed left upper bronchus obstruction. Conclusion Imaging of Wegener granulomatosis is complicated. Wegener granulomatosis should be diagnosed accompanied with clinical and pathologic findings.