RCAAP Repository

The current adhesive systems promote an immediate and effective bond strength to dental substrates, however, over time, there may be a degradation of that process, impacting negatively on the maintenance of resistance values. Chlorhexidine digluconate (CHX) its widespread use in dentistry as an antimicrobial agent, however beyond acting disinfectant, it has been studied to maintain the stability of the bond strength. On the other hand, some authors have considered the hypothesis that the collagen fibers may not be as important for micromechanical union between dentin and composite resin, since there is evidence that the phosphoric acid itself can lead to a change in the structure molecular fibers, which can denature them. The aim of this study was evaluate the effect of thermal collagen denaturation and 2% chlorhexidine (CHX) application on resin-dentin bond strength in teeth restored with conventional adhesive. The study sample consisted of 30 human third molars, of which the dentin was exposed followed by phosphoric acid etching. The specimens were distributed in three main groups (CHX, thermal denaturation and control). Thermal denaturation consisted of immersion in water at 50ºC for 10 minutes. Control and thermal denaturation groups was costumarily restored and CHX group was treated with 2% chlorhexidine after acid etching and before bonding. The specimens were stored in distilled water at 37ºC for 24 hours or 6 months and then sectioned into sticks which were submitted to tensile bond testing at a crosshead speed of 1mm/min. The bond failure mode was observed by microscopy (40X). The results of the tensile bond test were expressed in MPa and analyzed with the tests of Kolmogorov-Smirnov, Levine, Snyder F, Tukey and Student t. In all groups bond strength decreased significantly over 6 months (p<0.05), but the loss of bond strength was smaller in the CHX group (16,08%) than in the control group (27,27%) and the thermal denaturation group (28,58%). The hybrid layer was extensively degraded over a period of 6 months. However, treatment with CHX reduced loss of bond strength in relation to controls. Thermal denaturation of collagen fibrils did not affect bond strength.

A Síndrome da Apnéia e Hipopnéia Obstrutiva do Sono (SAHOS) é um distúrbio respiratório que se caracteriza pela obstrução recorrente das vias aéreas superiores durante o sono, na qual componentes anatômicos estão quase sempre envolvidos. Embora a cefalometria seja tradicionalmente utilizada para caracterização da morfologia craniofacial, métodos que se utilizam de fotografias padronizadas e análise facial vêm ganhando espaço na prática clínica diária. Este estudo foi conduzido através da aquisição de fotografias faciais digitais padronizadas de 60 indivíduos que se apresentaram por indicação médica para realização de exame de monitorização do sono (exame polissonográfico). Procurou-se estabelecer as características crânio-cérvico-faciais de indivíduos com SAHOS e suas possíveis associações com os dados polissonográficos coletados. Os resultados demonstraram que: as medidas craniofaciais obtidas indicam um predomínio do padrão vertical de crescimento (p<0,05); os indivíduos com SAHOS apresentaram alterações na região cervical na qual a medida de circunferência de pescoço se encontrou aumentada significativamente (p<0,05); verificou-se uma interação de variáveis craniofaciais e antropométricas com a variável polissonográfica representativa da quantidade de pausas respiratórias por hora de sono, evidenciando que quanto maior for o terço facial superior, o terço facial inferior e a circunferência cervical maiores serão as chances de o indivíduo apresentar SAHOS.

The contribution of renewable energy in world energy production is increasing rapidly. In Brazil, the installed capacity of wind power reached 1 GW in May 2011 and the investments for projects with start-up until 2013 are R$ 25 billion. Data acquisition systems are essential to estimate the energy potential of renewable energy plants, the wind power production as an example, require a large volume of data available from past years in order to derive accurate models of the renewable energy. In a similar way, if the photovoltaic generation system is installed in a place of a low solar potential, the project is unable to repay the value of the investment. Therewith, the development of a data acquisition system for decentralized renewable energy sources monitoring is described in the present dissertation. The system has a microcontroller-based unit for local storing and data transmission to internet by a modem and a database server is used to store the data. The proposed architecture is easily extended for controlling a decentralized renewable energy plant by the Matlab/Simulink program. A practical implementation is presented with the utilization of a non-recursive least square algorithm estimator to estimate the transfer function of a pumping plant and allowing an accurate control of water flow by the use of a PI controller. Correlations and performance tests are used to compare the data collected by the system prototype with the data collected by commercial equipment. The results indicate that the root mean square error is 0.103 m/s, for wind speed measurement and the correlation factor is greater than 0.9996. Overall, the low errors rates indicate that the data have been stored on to a broadly similar form to what would be expected based in a commercial equipment. Finally, the possibility of a commercial use of this project is presented to improvement of data transmission efficiency in a meteorological tower of Petrobrás in Paracuru - CE, Brasil.

MORAIS, Jader Onofre de. In gratitudinem Prof. Dr. Melquíades Pinto Paiva. Arquivos de Ciências do Mar. Fortaleza, v. 16, n. 1, 1976.

PITOMBEIRA, Erasmo da Silva. Deformação das ondas por difração no molhe do Porto do Mucuripe (Fortaleza - Ceará - Brasil). Arquivos de Ciências do Mar. Fortaleza, v. 16, n.1, p. 55-58, jun. 1976.

FONSECA, Verônica Gomes da.; KLEIN, Vera Lucia Mota. Estudo sobre a composição do plâncton, no estuário do Rio Jaguaribe (Ceará - Brasil). Arquivos de Ciências do Mar. Fortaleza, v. 16, n.1, p. 1-8, jun. 1976.

The elimination of bacteria inside the demineralized dentin layer might contribute for a more conservative approach in the restorative treatment of deep dentin caries lesions. This way, this in vitro study aimed to establish safe and effective parameters for using an LED (λ = 620-660 nm) associated to the photosensitizer toluidine blue O (TBO) in the disinfection of artificially produced dentin caries lesions. For this, slabs with 25 mm2 of flatted occlusal human dentin were immersed for 5 days in BHI broth inoculated with Streptococcus mutans for caries induction. After demineralization, the slabs were randomly allocated to 10 experimental groups (n=15), as follows Control5; Control10; Control15; TBO; LED5; LED10; LED15; PDT5; PDT10 and PDT15, which were treated with TBO (0.1 mg.ml-1 for 5 min) or 0.9% NaCl solution for 5, 10 or 15 min, and submitted or not to LED irradiation for 5, 10 or 15 min (47, 94, and 187 J/cm2). Dentin samples from caries lesions were collected before and after treatments and bacteria were then cultured for Streptococcus mutans counts. In addition, using a type K thermometer, the temperature inside the pulp and in periodontal area was monitored for the groups PDT5, PDT10 and PDT1510 in 10 teeth with deep occlusal cavities. Paired t test/Wilcoxon matched pairs test (=5%) were used to determine differences between microbial population before and after treatments, and ANOVA followed by Tukey test for comparing data of temperature and log reductions. Statistically significant differences in Streptococcus mutans viability were found for the groups: Control15; LED15; PDT5; PDT10 and PDT15. The temperature from intrapulpal and periodontal area were lower than 2oC, being higher inside the pulpal chamber for group PDT15 when compared to group PDT5. Thus, it the experimental conditions used in the study, photodynamic therapy may be a safe and effective treatment to be used for disinfecting carious dentin, however the influence of time of irradiation/exposition it the Streptococcus mutans viability should be better investigated.

NUNES, Maria Lucia et al. Composição química de alguns peixes marinhos do nordeste brasileiro. Arquivos de Ciências do Mar. Fortaleza, v. 16, n.1, p. 23-26, jun. 1976.

GESTEIRA, Tereza Cristina Vasconcelos; ROCHA, Carlos Artur Sobreira. Estudo sobre a fecundidade do ariacó, Lutjanus synagris (Linnaeus), da costa do Estado do Ceará (Brasil). Arquivos de Ciências do Mar. Fortaleza, v. 16, n.1, p. 19-22, jun. 1976.

Com o presente trabalho damos prossegui mento ao estudo da biologia pesqueira do pargo, Lutjantís purpureus Poey, no norte e nordeste brasileiros, iniciado a partir de 1966 (Fonteles-Filho, 1969, 1970 e 1972; Ivo 1973a/b e 1975). Durante o ano de 1975, os desembarques da frota pargueira sediada em portos do Estado do Ceará apresentaram uma produção equivalente a 5.041 toneladas métricas. Considerando-se o barco como unidade omostrai, de cada desembarque amostramos um número médio de 400 pargos, anotando-se o respectivo comprimento total; de cada amos tra, retiramos uma subamostra com cerca de 50 indivíduos, para registro do sexo e estádio de maturação sexual.

MATTHEWS-CASCON, Helena; MATTHEWS, Henry Ramos. Notas sobre a família Eratoidae no nordeste brasileiro (Molusca:Gastropoda). Arquivos de Ciências do Mar. Fortaleza, v.16, n.2, p.73-78, dez. 1976 .

OLIVEIRA, Moisés Almeida de. Distribuição da matéria orgânica na plataforma continental do Estado do Ceará (Brasil). Arquivos de Ciências do Mar. Fortaleza, v.16, n.2, p.105-110, dez. 1976.

The corrosion behavior and mechanical properties of Ni-Mo and Ni-W electrocoatings in NaCl solutions are investigated in this work. A comparative study has been done with the properties of Cr. All electrocoatings were obtained under galvanostatic control at room temperature and were evaluated in terms of composition, microstructure, microhardness, cristalinity and corrosion resistance. The surface morphology was characterized by scanning electron microscopy (SEM), the chemical composition was determined by energy dispersive X-rays (EDX), the microhardness was measured by the Vickers hardness test and the structure was determined by X-ray diffraction (DRX). The electrochemical corrosion tests were carried out by linear potenciodinamic polarization (PP) and electrochemical impedance spectroscopy (EIS). The results showed that Ni-Mo and Ni-W present good corrosion resistance when compared with Cr coatings, and the best were Ni-13Mo and Ni-14W. The layer’s micrographs present homogeneous layers with nodules distributed in the surface and cracks can be observed to Ni-17Mo and Ni-25Mo. Ni-Mo and Ni-W coatings are crystalline exhibiting a face-centred-cubic structure in the solid solution. The microhardness increased with the Mo or W percentage and heat treatments increased the hardness of the coatings, while Cr decreased its hardness with heat treatment.

The objective of the present work was to evaluate methods (maceration, decoccion and infusion) and times (30, 60 and 120 min. ) of extraction, besides the substances: fractions chloroform and acetate, and pure coumarin, in different concentrations, of the aqueous extract of cumaru seeds (Amburana cearensis S. ) on the germination, the development and the growth of lettuce seedlings (Lactuca sativa L. ). For “picão-preto” (Bidens pilosa L.) and “carrapicho” (Cenchrus equinatus L.) the effect of the concentration of the extract was evaluated and of the pure coumarin on seeds and seedlings. The experiments were accomplished at the laboratory of Analyses of Seeds, Department of Fitotecnia of the Federal University of Ceará, in Fortaleza-Ce. The aqueous rude extract was prepared starting from the flour of cumaru seeds, being used in the following concentrations: 0.19, 0.39, 0.78, 1.56, 3.13, 6.25, 12.5, 25 and 50 mg/mL, and water distilled as control. The seeds, of the tested species, they were distributed in plates of Petri on three disks of filter paper, previously humidified with the extract in the proportion of 2,5 times the weight of the substratum. Later the plates were conditioned in germination camera regulated to the temperature of 25° C and of 8h luz /16h dark, for seven days. The variables were analyzed: germination, length of the root and of the aerial part of the seedlings, in a in a casual interlay delineation, with four repetitions (50 seeds/repetition for lettuce and 25 for “picão-preto” and “carrapicho”). The most efficient method was the maceration. The time of extraction with better results was it of 30 min. The most potent substance was the pure coumarin. It was verified although starting from 6.25 mg/mL of the extract it happened an inhibition in 100% of the germination of the lettuce seeds. Starting from the concentration 3.13 mg/mL the bun of hair germination was totally inhibited. For “picão-preto” the concentrations 1.56, 3.13 and 6.25 mg/mL were the most harmful. The pure coumarin was plenty phytotoxicans for “picão-preto” and “carrapicho”, because it inhibited the germination of your seeds in the tested concentrations. All the concentrations of the extract presented toxicant effects to the seedlings of the tested species, in adult or smaller intensity.

PAIVA, Melquíades Pinto. Comentários sobre o comportamento do setor pesqueiro no Brasil. Arquivos de Ciências do Mar. Fortaleza, v.16, n.2, p.93-100, dez. 1976.

OGAWA, Edna Furtado; ROCHA, Carlos Artur Sobreira. Sobre a fecundidade de crustáceos decápodos marinhos do Estado do Ceará, Brasil. Arquivos de Ciências do Mar. Fortaleza, v.16, n.2, p.101-104, dez.1976.

FAUSTO FILHO, Jose; SAMPAIO NETO, João Batista S. Observações sobre alguns crustáceos estomatópodos e decápodos do norte do Brasil. Arquivos de Ciências do Mar. Fortaleza, v.16, n.2, p.65-71, dez. 1976.

ALVES, Maria Ivone Mota.; PAIVA, Melquíades Pinto. Frequência de acasalamentos em lagostas do gênero Panulirus White (Decapoda, Palinuridae). Arquivos de Ciências do Mar. Fortaleza, v.16, n.2, p.61-63, dez. 1976.

The present paper discusses the importance of using dynamic analyses to provide a better understanding of the structural response of asphaltic pavements. To this end, the Newmark’s algorithm was implemented for linear elastic and viscoelastic constitutive models in a Finite Element system. Quasi-static and dynamic analyses using different pulse loads where carried out in order to evaluate the differences in the structural responses generally used in mechanistic pavement design: (i) displacement on top of the asphalt surface layer; (ii) tension stress at the bottom of asphalt surface layer and (iii) compression stress on the top of the subgrade.

Cowpea (Vigna unguiculata (L.) Walp.), is very important crop for feeding the rural and urban populations of the tropical and subtropical areas of the world. The yield of that crop varies, mainly, because climate variations and of the use of low yield genetic materials with undesirable characteristics. Grains yield is influenced by the effects of environments (E), genotypes (G) and G × E interaction that into account the variabily of the genotypes in the several environments. The interaction G x E can be characterized by studying the adaptability and stability phenotipic using several techniques. This research aimed to verify the magnitude of the interaction G x E, their effects or the adaptability and the phenotipic stability of the productivity of grains of fifteen cultivate of cowpea. Four methodologies were used for this study (Eberhart and Russel, Cruz, Torres and Vencovsky, Lin and Binns and AMMI or “Additive Main effect and Multiplicative Interaction "). The experiments were carried out in five countries (“Alto Santo, Barreira, Crateús, Itapipoca and Limoeiro do Norte”) of the state of “Ceará”, Brasil, under rainfall conditions during the years of 2006 and 2007. A complete randomized design with 15 treatments and four replication were used. Each experimental unit were 3,0 m x 5,0 m, with four rows spaced by 0,75 m containing 20 plants 0,25 m apart. The two central rows were harvested for futher analysis. The extra plants in each experimental unit were thinning 15 days after sowing, leaving two plants per rows. The Eberhart and Russell linear regression did not classified the cultivars tested for general adaptation and stability; it means that all cultivars were considered unstable by this methodology. The bissegmented regression methodology proposed by Cruz, Torres and Vencovsky allowed to classify the cultivars as adaptable for favorable, unfavorable environment and for general adaptation, but all of than were considered unstable. The method of Lin and Binns classified the cultivars simultaneously for adaptability and stability with just a parameter in decreased order of sequence. The AMMI method made possible the explain most of the G x E interaction in the first two IPCA. This method classified the cultivars and environment in relation to the stability in two biplots in a pricise way. The f Spearman’s correlation indicated that some parameters used by the methodologies mentioned were associated and so they can not be used simultaneously. On the other hand, the one that were not associated be used as a complementarity. The list genotypes that showed highest adaptability and stability for grain yield were “Inhuma, BR 17 – Gurguéia, BRS-Marataoã, Sempre Verde-CE, BRS-Paraguaçu e BRS-Rouxinol” because they combined both parameters.