Orientador: Altair Antoninha Del Bel Cury, Renata Cunha Matheus Rodrigues Garcia / Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba / Made available in DSpace on 2018-08-05T13:21:12Z (GMT). No. of bitstreams: 1 Moura_JulianaSilva_D.pdf: 1782557 bytes, checksum: 062461fb23404728637a2298815f99c6 (MD5) Previous issue date: 2005 / Resumo: O objetivo deste trabalho foi avaliar a influência do método de polimerização e a presença da saliva humana na aderência de Candida spp. às superfícies de resinas acrílicas. Duzentas e cinqüenta e seis amostras retangulares (2,5 x 1,2 x 0,2 cm), confeccionadas com resinas polimerizadas por banho de água ou microondas foram avaliadas para rugosidade e energia livre de superfície e em seguida utilizadas para o ensaio de aderência de Candida spp. Para este propósito, as amostras foram aleatoriamente divididas em 8 grupos por resina, sendo quatro expostos durante 30 min a saliva humana. Em seguida, as amostras foram posicionadas verticalmente em tubos de plásticos estéreis contendo meio de cultura Sabouraud e uma entre quatro suspensões de Candida: Candida albicans, Candida tropicalis, Candida dubliniensis e Cândida glabrata (1 a 5 x 106 células / mL). A contagem das células aderidas foi realizada em microscópio óptico com 400 x de aumento. Os dados de rugosidade superficial e energia de superfície foram submetidos a ANOVA um fator e teste t. Não houve diferença estatística significante para rugosidade (p > 0,05), enquanto maiores valores de energia livre de superfície foram encontrados para a resina polimerizada por banho de água (p < 0,05). Para aderência de Cândida spp., os testes Wilcoxon-Mann-Whitney, Kruskal Wallis e Qui-quadrado demonstraram não haver influência dos valores de rugosidade e energia livre de superfície na aderência de Candida, enquanto houve uma diminuição geral na contagem de microrganismos em grupos expostos à saliva (p < 0,05). Concluiu-se que a saliva foi capaz de reduzir a aderência total de Candida, enquanto não houve correlação destes valores com rugosidade e energia de superfície / Abstract: The aim of this work was to evaluate the influence of polymerization methods and presence of human clarified saliva on Candida spp. adherence to acrylic resins surfaces. Two hundred and fifty six rectangular acrylic resins samples (2.5 x 1.2 x 0.2 cm) polymerized by water bath or microwave were evaluated for surface roughness and surface free energy and used in an adherence assay for Candida spp. For this purpose, acrylic samples were randomly divided into 8 groups for each resin, where 4 were exposed to saliva. For the adherence assay, the samples were placed vertically on test tubes containing yeast Sabouraud broth medium and one of the four Candida suspensions: Candida albicans, Candida tropicalis, Candida dubliniensis and Candida glabrata (1 to 5 x 106 cells / mL). Adhered yeasts were counted using an optic microscope at 400 x. Data from surface roughness and surface free energy were submitted to one-way ANOVA ant t test and Candida spp. adherence values were evaluated by the Wilcoxon-Mann-Whitney, Kruskal Wallis and Chi-square tests. No statistical significance was found for roughness (p > 0.05), while higher surface free energy values were found for water bath resin (p < 0.05). Roughness and surface free energy did not influence Candida adherence, while saliva generally decreased yeast counts (p < 0.05). It was concluded that polymerization methods did not interfere with adherence assay while saliva was capable of reducing Candida spp. adherence, while roughness and free energy did not influence the adherence rates / Doutorado / Protese Dental / Doutor em Clínica Odontológica

Candida tropicalis yeast is a microorganism that possesses high tolerance for phenol and strong phenol degrading activity. This yeast is capable of utilizing phenol as the sole source of carbon and energy without formation of any secondary waste product. Catechol-1,2- dioxygenase was isolated from cytosolic fraction of this yeast by the procedure consisting of chromatography on DEAE-Sepharose and gel permeation chromatography on Sephadex G- 100. The catechol-1,2-dioxygenase was purified to homogeneity. The enzyme activity was followed by HPLC (catechol consumption and/or cis,cis-muconic acid formation). The activity profiles at different temperatures showed temperature optimum of 30řC. Kinetic characterizations were studying in different values of pH. The values of Km and Vmax of 0,52 mM and 17,2 nM/min for consumption of catechol, respectively, and 0,34 mM and 12,6 nM/min for formation of cis,cis-muconic acid, respectively, were found at optimum pH of the reaction, pH 7,6.

Martínez Macías, F. (2015). Nuevos genes reguladores de la tolerancia a estrés abiótico en Arabidopsis [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/48560