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Desenvolvimento de nanocompósitos híbridos de epóxi/NTCPM/cargas minerais e avaliação das propriedades mecânicas, elétricas e térmicas
(Universidade Federal de São Carlos, 2016-07-11) Backes, Eduardo Henrique; Passador, Fabio Roberto; https://lattes.cnpq.br/0152213852695153; Pessan, Luiz Antonio; https://lattes.cnpq.br/8276650236213537; https://lattes.cnpq.br/6407713491620749
In the present work epoxy/ MWCNT/ mineral fillers nanocomposites were obtained using ultrasonication and calendering. The effect of addition of mineral filler (calcium carbonate, montmorillonite and sepiolite) in electrical, mechanical and thermal properties of epoxy/ MWCNT were analyzed. Two different CNT were studied, with different aspect ration and purity, however only Nanocyl CNT’s presented improvement in the nanocomposites electrical properties and for that reason was employed for hybrid epoxy/ MWCNT/ mineral nanocomposites production. The electrical percolation threshold was determined as 0.04 wt% and for 0.3 wt% the electrical conductivity reached 1.29X10-2 S/m. The addition of calcium carbonate and montmorillonite improved electrical conductivity for epoxy nanocomposites produced with 0.05 wt% CNT and the same behavior was observed for epoxy/ MWCNT / sepiolite nanocomposites at 0.1 wt% CNT. The epoxy/ MWCNT nanocomposite at 0.05% CNT when produzed via calendering presented improvement in the electrical conductivity compared to the same nanocomposite produced via ultrasonication. For epoxy/ MWCNT at 0.05 wt% of CNT, the addition of calcium carbonate in the nanocomposite led to an electrical conductivity 1 decade higher than the epoxy/ 0.05 wt% CNT nanocomposite produced via calendering. The mineral fillers also modified thermal and mechanical behavior of the nanocomposites, and improvements in flexural modulus, thermal stability and Tg were observed.
Busca de biomarcadores como indicadores do mecanismo de defesa da laranja pera à infecção de CVC através de análise metabonômica
(Universidade Federal de São Carlos, 2016-07-11) Cerqueira, Cristovam do Nascimento; Silva, Maria Fátima das Graças Fernandes da; https://lattes.cnpq.br/0457632122660653; https://lattes.cnpq.br/2532575955727305
This paper describes the search and identification of probable biomarkers related to defense mechanism triggered by the plants to the infection process of Xylella fastidiosa, bacterium that causes Citrus Variegated Chlorosis (CVC), which is one of the most serious diseases that cause losses in the Brazilian citrus industry.For this purpose, it was evaluated by chemometric tools and analytical methods such as, UPLC-ESI-QTof the metabolic variation between seedlings developed by seed ofCitrus sinensis and C. limonia in the search and identification of biomarkers that could indicate the biochemical mechanism that would explain the resistance of C. limoniaagainst CVC.It was also analyzed seedilings, healthy and infected by X fastidiosa,of C. sinensisgraftedon C. limonia in the searching of biomarkers to attempt to associate them with the metabolic routes and provide a defense mechanism explanation these seedilings against the infection process. For this objective to be achieved it has been used online databases as was also set up a secondary metabolite database of Citrus genus with all the metabolites recorded in the literature, enabling better selection and easier identification of these biomarkers. The chemometric tools (PCA, HCA, S-plot) applied to the data obtained in studies of LC-MS, discriminating 47compounds, of which 35were putatively identified as being responsible for C. limonia resistance process against to the bacterial infection process, where proposes that the chemical aspects related to this characteristic is due to the high concentrations of coumarinsSeselin and Xanthyletin in the leaves that would prevent the initial bacterial adhesion process in xilematcs vessels as well as proposes the highest flavonoid concentrations that would play the role of bactericidal agent. In the analysis of healthy and infected grafts it was possible to discriminate 41 compounds, of which 30were putatively identified, where the analysis of metabolites aspects indicated that during the infectious process there is a high expression of the family genes polyketide synthase which is responsible for high production alkaloids acridonicos in the infected roots and stems as well as in infected leaves of flavonoids.It may be associated as a defense mechanism.
Desenvolvimento de biossensor baseado em microcantilever funcionalizado com biomoléculas para a detecção de alcoois de cadeia curta
(Universidade Federal de São Carlos, 2016-07-11) Margarido, Alexandre; Araujo-Moreira, Fernando Manuel; https://lattes.cnpq.br/1809254923092721; Herrmann Júnior, Paulo Sérgio de Paula; https://lattes.cnpq.br/3478230611350302; https://lattes.cnpq.br/1240025943193636
This study presents the development of a biosensor using a microcantilever stem and its detecting response through dynamic mode of atomic force microscopy (AFM). Responses of different methods for immobilization of alcohol dehydrogenase enzyme were investigated in order to accomplish a selective detection of ethanol, methanol and isopropanol, using as arrays: self-assembly monolayer (SAM) and others arrangements formed on Si and Si3N4 microcantilevers surface. In addition, we aimed to evaluate the influence of the biological element immobilization process in the analytical performance of the biosensor. The process to development of a biosensor began with the activation of its surface by means of thiols and silanes with different carbon length chains, however with the same amine terminal groups (NH2). The microcantilevers activation is only possible with the oxidation of its surface and to check this process, the "High-resolution Xray Photoelectron Spectroscopy (XPS)" technique was used. Activation of the surface was obtained using different methods for coating of microcantilevers made only with Si (100) and Si3N4. Subsequently to the oxidation process, the binding of the biomolecule to the surface activated was performed using the bifunctional agent glutaraldehyde. Microcantilevers with both sides coated by biomolecules were investigated and a tension effect of surface was observed at a 0,3 mL/L of the target analyte. By analyzing the performance of the biosensor for the determination of the target analyte, it was realized that APTES activation methodology for biosensors steam and self-assembled monolayers were the most suitable techniques for immobilizing the recognition biomolecule. With this preparation, the biosensor it showed less susceptible to humidity and the temperature variations, presenting a high quality factor, a faster response time, selectivity, sensitivity and durability.
Gestão integrada de produtos químicos controlados pela Polícia federal, Polícia Civil e Exército
(Universidade Federal de São Carlos, 2016-07-11) Munhoz, Eduardo Antonio Pires; Marques, Silvio Cesar Moral; https://lattes.cnpq.br/6047434055828372; Melo, Ismail Barra Nova de; https://lattes.cnpq.br/3576937472687059; https://lattes.cnpq.br/4807079018375038
Several companies use in their activities controlled products by the Federal Police, Civil Police and the Brazilian Army. Faced with this situation obey the laws of control applicable on similar situations may generate doubts and confusion, impacting negatively on the activities of companies. Therefore, we sought to analyze the theories of management and legal rules of controlled chemicals by regulatory bodies, comparing them to the experiences of some cases to verify the legal and administrative ability to manage the control of the three bodies in an integrated manner. This work it is a literature review associated with the empirical analysis of 06 (six) experienced cases in which there were legal noncompliance with legal consequences. When that was found to the survey, the use of an integrated management of controlled chemicals may prove instrument facilitator to meet the specific legislation of each governing body, as well as the legal requirements of ISO 14001, in addition to ensuring adequate environmental safety by control of chemicals and social security to companies and their stakeholders. Finally, as a result of this research was proposed an Administrative Protocol on the managerial patterns of a PDCA cycle that enables the integrated management of products controlled by the Federal Police, Civil and Army, linked with roadmap for implementation of the Protocol through check- lists.