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Vinícius Faccin Bampi,Wadson Ferreira Vilela,Reggiani Vilela Gonçalves,Maria Gabriela Tavares Rheingantz,Luiz Fernando Minello,Jefferson Luis Braga da Silva,Laura Beatriz Oliveira de Oliveira 대한이비인후과학회 2014 Clinical and Experimental Otorhinolaryngology Vol.7 No.3
Objectives. The aim of this study was to verify the promoting effect of carbamide peroxide on dimethylbenzanthracene (DMBA)-induced carcinogenesis in the hamster buccal pouch, in order to reduce the period of latency for tumor for- mation. Methods. Sixteen hamsters were randomized into two groups of eight animals each. The hamsters of the group I had their right buccal pouches treated with 0.5% DMBA and 10% carbamide peroxide teeth bleaching gel for 55 days. The an- imals of the group II had their right pouches treated only with DMBA. After, six animals of each group had their pouches prepared for light microscopy. Histomorphometry was performed to assess the presence of keratinization, nuclear polymorphism, pattern of invasion, number of blood vessels, and inflammatory infiltrate in the tumor front. Furthermore, the newly formed lesions were graded according the Bryne’s grading system. The remaining animals had the vascular system of the pouches casted by Mercox and qualitatively analyzed by scanning electron microscopy. Results. Histopathological analysis of the buccal pouches treated with DMBA and carbamide peroxide exhibited formation of squamous cell carcinoma well-differentiated with a high degree of malignancy in all pouches. The development of this neoplasm was associated with a significant increase in the number of blood vessels, presence of keratin pearls, and inflammatory infiltrate. The pouches of the group II showed inflammation, epithelial hyperplasia, dysplasia, and squamous cell carcinoma in only three right pouches. The analysis of the electron micrographs of the pouches chemi- cally inducted with DBMA and carbamide peroxide reveled formation of a new vascular network characteristic of squamous cell carcinoma. Conclusion. The protocol presented here, using DMBA associated with carbamide peroxide, shortens the period of latency to produce squamous cell carcinoma in the hamster buccal pouch, decreasing the time and costs of the experiments.
Bruna Thaisa Martins Ferreira,Fernando Rodolfo Espinoza-Quiñones,Carlos Eduardo Borba,Aparecido Nivaldo Módenes,Washington Luiz Félix Santos,Fabricio Maestá Bezerra 한국섬유공학회 2020 Fibers and polymers Vol.21 No.6
In this work, the substitution of environmentally harmful additives in the industrial dyeing process of polyamide-6microfiber-made knitted fabrics (PA-6μFKF) was studied. Using the disperse red 60 (DR60) dye, kinetic adsorption tests onthe PA-6μFKF dyeing were performed by using either β-cyclodextrin (β-CD) additive, commercial leveling agents, orwithout additives. Equilibrium tests were also performed during 25 h. A modelling based on a dye adsorption processcontrolled by an intraparticle diffusion was proposed to represent the sets of kinetic data. Three isotherm models were alsotested for representing the equilibrium data. The kinetic data have evidenced three main dye diffusion zones. Differentadsorption mechanisms on PA-6μFKF surface dyeing was evidenced, being the data well represented by the two-stepLangmuir isotherm. Finally, the best quality on color uniformity was attained using the β-CD additive, revealing a goodalternative for the substitution of environmentally harmful additives in industrial dyeing processes.