Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-05-11T20:02:58Z No. of bitstreams: 1 LeonardoNunesMaiaPimentel_DISSERT.pdf: 1254095 bytes, checksum: a9efb1c54d07df68ac2b799a5135cc7e (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-05-19T00:29:08Z (GMT) No. of bitstreams: 1 LeonardoNunesMaiaPimentel_DISSERT.pdf: 1254095 bytes, checksum: a9efb1c54d07df68ac2b799a5135cc7e (MD5) / Made available in DSpace on 2016-05-19T00:29:08Z (GMT). No. of bitstreams: 1 LeonardoNunesMaiaPimentel_DISSERT.pdf: 1254095 bytes, checksum: a9efb1c54d07df68ac2b799a5135cc7e (MD5) Previous issue date: 2015-07-27 / O objetivo desse estudo foi avaliar a influ?ncia de agentes remineralizantessobre a susceptibilidade do esmalte clareado ? pigmenta??o por caf? durante o clareamento de consult?rio. Noventa incisivos bovinos foram selecionados e divididos aleatoriamente em 5 grupos (n=10) em fun??o dos agentes remineralizantes: G1 sem pigmenta??o e sem agente remineralizante; G2, fl?or neutro; G3, Nano-P, G4, CPP-ACP e; G5 sem remineralizante. A solu??o pigmentante foi confeccionada com caf? sol?vel (Nescaf?) de acordo com as orienta??es do fabricante. As amostras foram imersas no caf?, em temperatura de 55?C, por 1 minuto/4x ao dia. Todos os grupos foram clareados com Per?xido de Hidrog?nio a 35%. As medidas de cor foram realizadas pelo espectrofot?metro Easyshade (VITA), pelo m?todo CIE Lab, antes e depois das 3 sess?es de clareamento. Os dados foram submetidos ? An?lise de Vari?ncia ANOVA a dois crit?rios para medidas pareadas e ao p?s-teste de Tukey para m?ltiplas compara??es (p<0,05). Os resultados mostraram haver diferen?as estatisticamente significantes entre as subst?ncias remineralizantes para os par?metros *L, *a, *b e ?E (p<0,0001). Os valores de L*, para o grupo G5, e os de *b, para os grupos G2 e G5, diferiram do grupo controle. Ap?s a 3? sess?o de clareamento, os grupos do Fluor (G2) e aquele sem agente remineralizante (G5) apresentaram valores de ?E inferiores ao grupo controle, n?o pigmentado. Concluiu-se que a apenas os agentes remineralizantes CPP-ACP e Nano-P foram capazes de reduzir a interfer?ncia do caf? na efic?cia clareadora do per?xido de hidrog?nio. / The aim of this study was to evaluate the influence of remineralizing agents on the susceptibility of enamel cleared by the coffee pigmentation during office bleaching. Fifty bovine incisors were selected and randomly assigned into 5 groups (n = 10) on the basis of remineralizing agents: G1 gel hydrogen peroxide to 35% (control group); G2, hydrogen peroxide gel and a 35% gel 2% neutral fluorine; G3, hydrogen peroxide gel and a 35% nanostructured calcium phosphate gel, G4, hydrogen peroxide gel and a 35% casein fosfopt?dia-phosphate and amorphous calcium folder; G5 hydrogen peroxide gel to 35% without mineralizing agent. All groups exception G1 (control group) were subjected to pigmentation soluble coffee according to the manufacturer's guidelines. The samples were immersed in coffee at temperature of 55? C, 1 time a day for 4 minutes. Color changes were performed by Easyshade spectrophotometer at CIE Lab method before and after 3 whitening sessions. Data were analyzed by analysis of variance ANOVA. The results showed statistically significant differences between the remineralizing substances for the parameters L *, a *, b * ?E (p <0.0001). The L * values for the group G5, and the b * for G2 and G5 groups differed from the control group. After the 3rd whitening session, Fluor's group (G2) and that without mineralizing agent (G5) showed ?E values less than the control group that did not undergo pigmentation. It was concluded that only the nanoclusters remineralizing agents Phosphopeptides Casein-Amorphous Calcium Phosphate and Calcium Amorphous phosphate were able to reduce the coffee interference whitening efficacy of hydrogen peroxide.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-09-05T19:56:02Z No. of bitstreams: 1 SamilaNeresDeOliveira_DISSERT.pdf: 989578 bytes, checksum: 0d9d4bbfe814cd988071e39d3062f876 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-09-15T23:53:31Z (GMT) No. of bitstreams: 1 SamilaNeresDeOliveira_DISSERT.pdf: 989578 bytes, checksum: 0d9d4bbfe814cd988071e39d3062f876 (MD5) / Made available in DSpace on 2017-09-15T23:53:31Z (GMT). No. of bitstreams: 1 SamilaNeresDeOliveira_DISSERT.pdf: 989578 bytes, checksum: 0d9d4bbfe814cd988071e39d3062f876 (MD5) Previous issue date: 2017-07-10 / A sensibilidade ? o principal efeito adverso causado pelo clareamento dent?rio. O presente estudo tem como objetivo comparar a efic?cia dos f?rmacos ibuprofeno e a associa??o de code?na + paracetamol, no controle da sensibilidade imediata gerada pelo clareamento dent?rio de consult?rio com per?xido de hidrog?nio a 35%. M?todos: Foram selecionados aleatoriamente 60 volunt?rios e os mesmos foram divididos em 3 grupos: Placebo (PL) 400 mg (n= 20), Ibuprofeno (IB) 400 mg (n= 20) e associa??o de Code?na 30 mg + Paracetamol 500 mg (CP) (n= 20). Os volunt?rios foram submetidos a 2 sess?es de clareamento com per?xido de hidrog?nio 35% em 2 aplica??es de 20 min cada. As medica??es foram tomadas 1 hora antes do procedimento clareador em ambas as sess?es. Os valores de sensibilidade foram coletados utilizando uma escala visual anal?gica de dor. A an?lise estat?stica foi feita atrav?s do teste de ANOVA 1 Fator e p?s teste de tukey, utilizando o software Assistat?. Resultados: Houve diferen?a estatisticamente significativa entre os tratamentos (p<0,01) (m?dias: PL: 4,7; IB: 4,8 e CP: 1,0). Conclus?o: O tratamento da associa??o de code?na + paracetamol foi mais eficaz em eliminar a sensibilidade imediata gerada pelo clareamento dent?rio com per?xido de hidrog?nio 35%, com valores bem pr?ximos de zero, em compara??o as medica??es ibuprofeno e placebo. / Sensitivity is the main adverse effect caused by tooth whitening. The aim of the present study was to compare the efficacy of ibuprofen and the combination of codeine + paracetamol in the control of the immediate sensitivity generated by dental office whitening with 35% hydrogen peroxide. Methods: Sixty volunteers were randomly selected and divided into three groups: Placebo (PL) 400 mg (n = 20), Ibuprofen (IB) 400 mg (n = 20) and Codeine 30 mg + Paracetamol 500 mg (N = 20). The volunteers were submitted to 2 bleaching sessions with 35% hydrogen peroxide in 2 applications of 20 min each. Medications were taken 1 hour before the bleaching procedure in both sessions. Sensitivity values were collected using a visual analog pain scale. Statistical analysis was done using ANOVA 1 Factor and post test of tukey, using Assistat? software. Results: There was a statistically significant difference between the treatments (p <0.01) (averages: PL: 4.7, IB: 4.8 and CP: 1.0). Conclusion: The treatment of codeine + paracetamol was more effective in eliminating the immediate sensitivity generated by tooth whitening with 35% hydrogen peroxide, with values close to zero, compared to ibuprofen and placebo.

Made available in DSpace on 2014-12-17T15:41:59Z (GMT). No. of bitstreams: 1 Mariele ISM_DISSERT.pdf: 4704397 bytes, checksum: 9fa1538bc3d6948d492f9a6c378eaf62 (MD5) Previous issue date: 2012-07-20 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / Processo de Dessulfuriza??o Oxidativa (ODS) de um diesel comercial foi realizado em condi??es suaves na presen?a de catalisadores a base de van?dio ou mangan?s, suportados em aluminas, argilas e ze?litas. A oxida??o e extra??o da mol?cula de dibenzotiofeno (DBT), representando os compostos de enxofre presentes no diesel, foram realizadas usando como solvente a acetonitrila e oxidante o per?xido de hidrog?nio a temperatura de 55?C. O processo mostrou-se eficiente, o DBT foi convertido para sua respectiva sulfona, e a quantidade que n?o foi convertida a sulfona foi extra?da pelo solvente. O sistema de rea??o apresentou remo??o e oxida??o de at? 100% do composto de enxofre com alguns catalisadores. Verificando que para a oxida??o os catalisadores foram mais ativos, e os catalisadores de mangan?s apresentaram melhores resultados na extra??o dos compostos de enxofre.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-02-21T00:14:46Z No. of bitstreams: 1 JulianaGabrielaSilvaDeLima_DISSERT.pdf: 2326207 bytes, checksum: 72dd0aa19271777e0700d9c307ad79e7 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-03-03T21:38:22Z (GMT) No. of bitstreams: 1 JulianaGabrielaSilvaDeLima_DISSERT.pdf: 2326207 bytes, checksum: 72dd0aa19271777e0700d9c307ad79e7 (MD5) / Made available in DSpace on 2017-03-03T21:38:22Z (GMT). No. of bitstreams: 1 JulianaGabrielaSilvaDeLima_DISSERT.pdf: 2326207 bytes, checksum: 72dd0aa19271777e0700d9c307ad79e7 (MD5) Previous issue date: 2016-09-16 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Durante o desenvolvimento p?s-germinativo, o d?ficit h?drico e concentra??es t?xicas de sais podem afetar processos dos tecidos cotiledonares, como o crescimento, a atividade de enzimas e a mobiliza??o das reservas lip?dicas, al?m de gerar um desequil?brio redox celular. No entanto, os estudos geralmente relatam altera??es metab?licas ao longo do desenvolvimento sob estresses aplicados apenas no momento da embebi??o. Visto isso, o objetivo desde estudo foi avaliar as mudan?as fenol?gicas e fisiol?gicas ocasionadas pelos estresses h?drico, induzido por polietilenoglicol (PEG-8000), e salino, induzido por NaCl, aplicados no momento da embebi??o ou durante a fase de transi??o semente-pl?ntula. Adicionalmente, o estudo tamb?m teve como finalidade caracterizar a atividade das enzimas APX, CAT e SOD e a express?o das enzimas APX, CAT, ICL e MLS das pl?ntulas de c?rtamo de pl?ntulas submetidas aos estresses apenas durante a fase de transi??o semente-pl?ntula. Verificou-se que as pl?ntulas sofreram altera??es fenol?gicas e fisiol?gicas diferentes de acordo com o momento de aplica??o do NaCl e do PEG. Os tratamentos realizados durante a transi??o semente-pl?ntula afetaram em menor grau o crescimento das ra?zes, a taxa e o ?ndice de velocidade de germina??o do que a aplica??o de NaCl e PEG no momento da embebi??o. Entretanto, o efeito do PEG sob os par?metros fenol?gicos e fisiol?gicos avaliados foi mais severo em rela??o ao observado para o NaCl independentemente do momento de aplica??o dos tratamentos. Interessantemente, durante a transi??o semente-pl?ntula, os teores de H2O2 e de lip?deos peroxidados nas pl?ntulas controle sofreram intenso aumento durante o estabelecimento. Por?m, ambos os estresses induziram diminui??es nos teores de clorofilas, carotenoides, H2O2 e lip?deos peroxidados, quando comparado ao controle, apesar das plantas submetidas aos tratamentos apresentarem consider?vel diminui??o na atividade da SOD e CAT. Estas redu??es tamb?m ocorreram a n?vel transcricional, uma vez que n?o houve express?o da CAT durante o tratamento com NaCl, sendo observada apenas 72 h ap?s o tratamento com PEG. J? a atividade e express?o da APX se mantiveram altas nas pl?ntulas tratadas, assim como a express?o da MLS. A partir disto, conclu?mos que condi??es estressantes especificamente durante a transi??o semente-pl?ntula podem interferir no processo de sinaliza??o induzido por H2O2 necess?rio ao completo estabelecimento, ocasionando atrasos no in?cio do metabolismo fotossint?tico. Al?m disso, o sistema da APX pode ter um importante papel na manuten??o deste processo. / During seed?s post-germinative development, drought and toxic ionic concentrations affect physiological and metabolic processes of cotyledonary tissues, such as growth, enzyme activity and mobilization of lipid reserves, as well as contribute to a cellular redox imbalance. However, studies generally report metabolic changes throughout the development under stress conditions applied only at the time of soaking. Therefore, this study aimed to evaluate the phenological and physiological changes caused by Poliethyleneglycol induced-osmotic stress (PEG-8000) and NaCl induced-salt stresses applied during soaking or during seed-to-seedling transition. In addition, the present work characterizes the activity of APX, CAT and SOD enzymes and APX, CAT, ICL and MLS mRNA expression of safflower seedlings subjected to stress applied only at the seed-to-seedling transition stage. It was observed that seedlings suffered phenological and physiological changes according to application time of NaCl and PEG treatments. During the seed-to-seedling transition, stress conditions affected root growth, germination rate and germination speed index in lower levels than when they are applied at the time of soaking. PEG-induced osmotic stress exerts more severe effects on the evaluated phenological and physiological parameters, regardless of application time. Interestingly, during seed-to-seedling transition, the H2O2 and lipid peroxidation levels in control seedlings showed an intense increase during establishment. Conversely, both stresses induced decreases in chlorophyll, carotenoids, H2O2, and peroxidized lipid levels when comparing to control, even though stressed plants presented marked reductions in SOD and CAT activities. These reductions were also at the transcriptional level, since CAT mRNA expression was only observed after 72 h of PEG treatment and not observed at all during NaCl treatment. On the other hand, APX activity and expression remained high during both treatments, as well as MLS mRNA expression. Taking into account all the obtained results, we conclude that specific stress conditions during seed-to-seedling transition may interfere in the H2O2 signalization needed to complete establishment, causing delays on the beginning of photosynthetic metabolism. Also, it seems that APX system may have an important role in maintenance of this process.

Made available in DSpace on 2014-12-17T15:42:00Z (GMT). No. of bitstreams: 1 Mariele ISM_DISSERT.pdf: 4704397 bytes, checksum: 9fa1538bc3d6948d492f9a6c378eaf62 (MD5) Previous issue date: 2012-07-20 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / The oxidative desulfurization process (ODS) of a commercial diesel fuel was performed under mild conditions in the presence of catalysts based on vanadium or manganese, supported on alumina, clays (commercial, natural and pillared) and zeolites (NaX, NaY, beta, mordenite and ZSM-5). The catalysts were synthesized by wet impregnation and characterized by X-ray diffraction, textural analysis by N2 adsorption and scanning electron microscopy. The dibenzothiophene (DBT) was used as sulfur compound in catalytic evaluation. The reactions were performed using acetonitrile as solvent and the hydrogen peroxide as oxidant at 55?C. The reaction products were analized by gas chromatography (GC-FID). In the studied conditions, the process was efficient due to the DBT was converted to its corresponding sulfone. Both DBT and corresponding sulfone were extracted by the solvent. Removals and oxidations up to 100% of sulfur compound were achieved. The catalysts supported on ZSM-5 zeolite showed are more effective for oxidation reaction of sulfur compound, presenting the best results. It was observed for oxidation reaction, that vanadium catalysts were more effective and manganese catalysts showed best results for removal of sulfur compounds / O processo de Dessulfuriza??o Oxidativa (ODS) de um diesel comercial foi realizado em condi??es suaves na presen?a de catalisadores ? base de van?dio ou mangan?s, suportados em aluminas, argilas (comerciais, naturais e pilarizadas) e ze?litas (NaX, NaY, beta, mordenita, ZSM-5). Os catalisadores foram sintetizados via impregna??o ?mida e caracterizados por difra??o de raios-X, an?lise textural por adsor??o e dessor??o de nitrog?nio e microscopia eletr?nica de varredura. O dibenzotiofeno (DBT) foi utilizado como o composto de enxofre nos testes catal?ticos. As rea??es foram realizadas usando como solvente acetonitrila e como oxidante o per?xido de hidrog?nio a temperatura de 55?C. Os produtos de rea??o foram analisados por cromatografia gasosa (CG-FID). Nas condi??es estudadas o processo mostrouse eficiente, o DBT foi convertido para sua respectiva sulfona. Ambos DBT e a sulfona foram extra?dos pelo solvente. Remo??es e oxida??es de 100% do composto de enxofre foram alcan?adas. Os catalisadores suportados na ze?lita ZSM-5 mostraram-se mais efetivos para a rea??o de oxida??o do composto sulfurado, apresentando os melhores resultados. Observa-se para a rea??o de oxida??o que os catalisadores de van?dio foram mais efetivos, e os catalisadores de mangan?s apresentaram melhores resultados na extra??o dos compostos sulfurados