Avaliação in vitro da ação de substâncias químicas auxiliares, clorexidina e medicações intracanais sobre C. albicans, E. faecalis, E. coli e sua endotoxina em canais radiculares: [recurso eletrônico]

The purpose of this study was to evaluate the antimicrobial activity of chlorhexidine gel 2% as auxiliary chemical substance on the biomechanical preparation (BMP) and medication intracanal (ICM) on C. albicans, E. faecalis, E. coli and their endotoxin in root canals. We used 48 single-rooted human teeth divided into four groups according to dressing ICM: 1) Ca(OH)2 + pyrogen-free saline solution; 2) 2% chlorhexidine gel (CLX); 3) Ca(OH)2 + CLX, and; 4) pyrogen-free saline solution (control group). Were collected the contents of root canals to confirm the presence of microorganisms (confirmation), immediately after instrumentation (1st collection), after 7 days of the BMP (2nd collection), after 14 days of the action of ICM (3rd Collection) and 7 days after removal of the ICM (4 th collection). Were performed: the evaluation of antimicrobial activity and the content analysis of endotoxins for all sampling tests. The results were statistically analyzed using Kruskall-Wallis and Dunn tests with a significance of 5%. It was found that the CLX as auxiliary chemical substance has significantly reduced microorganisms confirmation collection when compared. In relation to the neutralization of endotoxin, it was found that the 1st and 2nd collections presented a decrease of 92.03% and 98.10% in mean percentage respectively, when compared to the confirmation collection. In the 3rd and 4th samplings, the Ca (OH)2 + CLX group showed the best results. It was concluded that the BMP and the ICM were able to eliminate the tested microrganisms, however, they were not able to completely eliminate endotoxins root canal

Simulação de contaminação de sedimentos e águas subterrâneas por gasolina e álcool: um estudo de monitoramento de variações das propriedades físico-químicas

Geophysics studies in areas impacted by petroleum derivatives describe abnormalities of both low and high electrical resistivity (the opposite of electrical conductivity), confirmed as contaminant phase by chemical analysis: this contradiction can be explained by degrading processes that naturally occur and create sub products that can change the environment conductivity. Monitoring the variation of the parameters mentioned serves as a comparative basis to the variation in geoelectrical parameters, which identified the correlation between the same contaminant parameters and the difference between their behavior studied apart, as well as its relations with the biodegradation process. The results are applied to the fuel distribution and storage sectors, leading to the diagnosis and monitoring of possible groundwater contamination scenarios, and the knowledge of the area exposure time to the contaminant, besides the better remediation alternative and impacts control. Among some conclusions, the most significant are the decrease in conductivity over time, so as the increase in Eh value in the gasoline contaminated tank, as well as the decrease in the pH value in the second tank with ethanol, which can be attributed to its degradation. Comparing the variations in both tanks, it is evident that Eh, pH and electrical conductivity do not behave temporally in a similar way, although some correlations between Eh and pH can be related.

Propriedades físico-químicas e mecânicas, potencial bioativo e caracterização da interface dentina-cimento de cimentos endodônticos experimentais à base de cimento Portland associados à radiopacificadores micro e nanoparticulados

Pós-graduação em Odontologia - FOAR

Colágeno: caracteristicas químicas e propriedades funcionais

Many types of food contain ingredients or bioactive compounds that provide health benefits. The collagen is a fibrous protein found in the connective tissue of the body, and it plays a part in the tissues resistance and elasticity. Due to their functional characteristics, this protein has been added into foods in order to achieve therapeutic effects. This paper aimed at showing how the collagen formation occurs, and the beneficial effects of this compound in the organism as well as its characteristics, properties and applications in food.

Avaliação das características físico-químicas e microbiológicas dos componentes fibrosos obtidos da moagem úmida de grãos de milho

Fibers are non-digestible materials by human organism, and they are insoluble in specific conditions. The corn fiber has been used as an alternative to enrich the food products for human consumption, in order to add nutritious value to this co-product. This study aimed at determining the chemical and fractions components of corn fiber, extracted by semi-wet milling in laboratory (LabF), and by semi-humid milling in industrial process (IndF); and microbiological analyses were perform in the last fraction. The fiber composition differed significantly among these two products as to moisture, ash, lipids, proteins, insoluble dietary fiber, neutral detergent fiber (NDF), acid detergent fiber (ADF), cellulose and lignin contents. The sample IndF showed microbiological parameters in compliance with the specifications for consumption. The investigated corn fiber may effectively contribute to increase the fiber intake in the diet. As the industrially processed fiber (IndF) showed compliant microbiological parameters with the specifications for food, this component might be incorporated into the food products formulation.

Revisão: propriedades físico-químicas do biodiesel

The present literature review aimed to describe biodisel’s physicochemical properties obtained from different raw materials. Were studied data concerning viscosity, density, cetane number, fl ash point, pour point and calorifi c power of biodiesel produced from soybean oil, coconut, rice bran, cotton, pequi, babassu, mamona, palm, castor, sunfl ower, corn, canola, jatropha and karanja. Considering the diversity of vegetal and animal sources that can be used on the biodiesel production, it is noteworthy the lack of data concerning physicochemical properties of unexplored raw materials. This work may contribute for the creation of database about physicochemical properties of oil and biodiesel from different sources which will allow design and scale-up, both the necessary equipment to the production line and reciprocating engines.

Porta-enxertos na produção e nas características físico-químicas da uva e do vinho de diferentes cultivares em Jundiaí, SP

Pós-graduação em Agronomia (Horticultura) - FCA

Avaliação dos processos de redestilação e purificação com carvão ativado nas qualidades sensoriais e físico-químicas da cachaça

A cachaça é uma bebida exclusivamente brasileira que vem conquistando espaço no mercado dentre as bebidas alcoólicas destiladas. Porém, o Brasil é responsável pelo consumo de 99% do total produzido por ano e apenas 1% é exportado. Isso se deve à falta de padronização na produção e de conhecimento por parte dos produtores, que levam a contaminação por compostos indesejáveis produzindo uma bebida de baixa qualidade, tanto físico-química quanto sensorialmente. Os métodos de redestilação e filtração em carvão ativado vêm sendo alternativas para melhoria da qualidade. Amostras de cachaças foram submetidas a esses métodos e avaliadas quanto à composição química e a qualidade sensorial. As análises químicas de acidez volátil, aldeídos, ésteres, metanol, álcoois superiores e carbamato de etila foram realizadas em triplicatas utilizando cromatografia gasosa. Para a análise sensorial, as amostras foram submetidas ao Teste de Aceitação utilizando escala hedônica híbrida de nove pontos e avaliadas pelo Teste de Kruskal-Wallis. Foi aplicado também o Teste de Ordenação para avaliar a preferência entre as amostras e a Intenção de Compra foi avaliada utilizando-se uma escala de cinco pontos, de certamente não compraria a certamente compraria. A redestilação reduziu os níveis de acidez volátil, cobre e carbamato de etila enquanto a filtração diminuiu as concentrações de aldeídos e ésteres. Os processos de redestilação e filtração em carvão ativado não alteraram a aceitação da bebida, mantendo seu perfil sensorial e melhoraram a composição química.

Produção e posterior semeadura de sementes de soja enriquecida com molibdênio: qualidade fisiológica, alterações químicas e nutricionais, métodos e épocas de aplicação

Pós-graduação em Agronomia - FEIS

Um estudo teórico e experimental de nanoestruturas de 'ZnS': propriedades físicas e químicas

Pós-graduação em Química - IQ

Ininteligibilidade e hermenêutica nas afinidades eletivas, de Goethe

In this paper, we analyze Goethe's Elective Affinities novel under the perspective of relations between intelligibility and hermeneutics, a kind of conflict explored by the author to establish a critical position in relation to the hermeneutic activity.

Produtividade e características físico-químicas de ora-pro-nobis sob adubação orgânica

Pós-graduação em Agronomia (Horticultura) - FCA

Liberação controlada de nutrientes e novos sistemas para avaliação de espécies químicas empregadas na fertilização

Pós-graduação em Química - IQ

Variação sazonal das variáveis físicas e químicas em riachos de duas bacias da região centro-sul do estado do Paraná, sul do Brasil

The present study was developed in two streams from the two different drainage basins located in the mid-southern region of Paraná state. In each stream were evaluated some physical and chemical parameters in open (without streamside vegetation) and shaded (with streamside vegetation) segments. Monthly samplings were carried out from January to December 2007. The following limnological parameters were measured: water temperature, specific conductance, oxygen saturation, pH, turbidity and current velocity. In the same stream were not observed differences among segments from the drainage basins, and nominal values and seasonal pattern have been very similar between open and shaded ambient. A Principal Component Analysis (PCA) showed small divergence between streams and segments, with separation of groups with base sampling dates. The results suggest that the region is homogeneous according to physical and chemical water conditions, therefore, stronger influenced for time factor, and diverging seasonal periods associated a climatic region condition.