ABSTRACT
Catalytic syntheses of CNTs on the pristine Ti mesh, the pristine Ti plate and the etched Ti plate have been conducted using thermal chemical vapor deposition (CVD) with Fe catalysts. Surface of the pristine Ti plate was etched in a sulfuric acid (H2SO4) solution to facilitate the uniform dispersion of Fe catalysts. The surface of Ti substrates, the distribution and the composition of catalysts, and the structure and dispersion of the CNTs were examined using Scanning electron microscope (SEM), transmission electron microscope (TEM), atomic force microscope (AFM), electron probe micro-analysis (EPMA) and Micro-Raman spectroscopy. Fe catalysts were dispersed uniformly on the surface of the etched Ti plate indicating that Surface modification by etching was effective. CNTs on the pristine Ti mesh and the etched Ti plate are more densely populated and have smaller diameters than CNTs on the pristine Ti plate. These results can be attributed to smaller Fe catalysts more homogeneously distributed on the pristine Ti mesh and the etched Ti plate. The calculated I(G)/I(D) ratios of 1.02 and 0.97 for CNTs on the pristine Ti mesh and the etched Ti plate, respectively, indicate a high degree of structural disorders on CNTs.
ABSTRACT
BACKGROUND: Scabies is a contagious skin infestation characterized clinically by nocturnal pruritus, visible burrows and contagiousness. Dermoscopy has been suggested as an alternative for diagnosing scabies. But, there have been few well-designed studies evaluating the diagnostic accuracy of dermoscopy. OBJECTIVE: We tried to confirm the diagnostic accuracy of dermoscopy for diagnosing scabies. We also tried to demonstrate specific circumstances in which dermoscopic identification of mites ("with dermoscopy") is more useful in diagnosing scabies, and to identify the specific clinical findings that could be used as a possible marker in diagnosing scabies. METHODS: We compared the scraping procedure "with dermoscopy" and "without it" in 49 patients, measuring the duration and outcome of each procedure. Also, we tried to find the specific clinical factors associated with our objects. RESULTS: The skin scraping "with dermoscopy" was superior to "without it" with respect to the duration and accuracy of the procedure. A history of previous steroid treatment was associated with the superiority of dermoscopy. The correlation between the presence of visible burrows and the positive outcomes of "with dermoscopy" was statistically significant. CONCLUSION: Skin scraping with dermoscopy is implicated as the diagnostic method of choice for scabies at the present time. Dermoscopy is especially useful in diagnosis of incognito scabies. In addition, the presence of visible burrows could be a reliable positive marker of scabies in the absence of dermoscopy or microscopy data.
ABSTRACT
Eruptive vellus hair cysts are asymptomatic, flesh-colored-to-bluish, 1-to-4 mm-sized papules that are usually located on the chest and extremities of children and young adults. Histologically, small cysts are observed in the mid-dermis and these cysts contain multiple hair shafts and keratinous materials. We report here on a case of eruptive vellus hair cysts that developed on a rare site, the labium major.
