973 resultados para Pd and Rh complexes


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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Ironstones, que ocorrem na base da Formação Pimenteiras (Devoniano), na borda noroeste da Bacia do Parnaíba, foram investigados ao longo dos perfis Xambioá-Vanderlândia e Colinas do Tocantins-Couto Magalhães. Esses ironstones formam camadas de espessura decimétrica, descontínuas e intercaladas em arenitos e siltitos, que jazem sobre rochas do cinturão Araguaia. Além da textura oolítica, os ironstones de Xambioá-Vanderlândia diferem dos de Colinas do Tocantins-Couto Magalhães por conterem menores quantidades de material terrígeno, notadamente quartzo, e maiores proporções de oxi-hidróxidos de Fe. São ainda mais enriquecidos em V, Sr, Zr e ΣETR e mais empobrecidos em Al2O>sub>3 e Rb. Diferem também no padrão de distribuição dos ETR normalizados ao North American Shale Composite (NASC), especialmente com relação aos valores de (ETRI)N, os quais, mais altos nos ironstones oolíticos e mais baixos nos não oolíticos, geram curvas convexas e côncavas, respectivamente. No campo, não foram estabelecidas as relações espaciais entre as duas variedades de ironstones, porém sugere-se que elas representem diferentes fácies da mesma formação ferrífera. Possivelmente, a deposição da fácies não oolítica ocorreu mais afastadamente da borda continental, em ambiente de águas mais profundas e calmas, onde foram descarregadas maiores quantidades de sedimentos detríticos; a deposição da fácies oolítica transcorreu em águas mais rasas e agitadas, com menor suprimento de material terrígeno. O transporte do Fe poderia ter resultado, em grande parte, da erosão fluvial de áreas continentais marcadas por ambientes redutores, o que teria favorecido a solubilidade daquele metal na forma de complexos orgânicos.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Pós-graduação em Química - IQ

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Pós-graduação em Química - IQ

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Pós-graduação em Odontologia - FOAR

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The Tahiti lime appears very susceptible to attack by post-harvest diseases, primarily by the fungi Penicillium and Phomopsis, and also because of its high sensitivity to storage at low temperatures. In order to reduce such damage, the present study aimed to verify the efficiency of heat treatment and disinfection of pathogens in the prevention of post-harvest chilling injury of this cultivar and to compare this treatment with other products using the conventional fungicides. The heat treatments were studied with hot-water temperatures ranging between 48 and 56° C. Water at room temperature was used as a control treatment. After treatment, the fruits were kept under cold temperature at 10° C and RH 90% for about 45 days. For comparison, three other treatments were carried out simultaneously, one using imazalil, one with baking soda, and a third with sodium carbonate, these three products being applied by baths in cold water. Two groups of fruit were evaluated, one treated by immersion considering pathogens coming from the field and another by inoculation with spores of the previously isolated pathogens. For the evaluation of physical and chemical parameters of fruits, determinations were made of the skin color, texture, weight loss, size, juice yield, soluble solids, total acidity and vitamin C content. The determination of the sensitivity of the fruit to cold was made by their exposure at temperatures inducing cold damage. The design was a randomized block design with nine treatments, analyzed by the Statgraphics statistical package. Heat treatments, especially at 52° C, were shown to be more promising in the control of pathogenic fungi and cold damage, surpassing the conventional fungicides. No changes were found in the intrinsic and extrinsic parameters in relation to the application of the different treatments.

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This study aimed to evaluate the effect of muscle strengthening in the balance, mobility and quality of life (QoL) in individuals with Parkinson's disease (PD), and to check the correlation between muscle strengthening and QoL. Nine subjects belonging to both sexes, diagnosed with PD, participated in this study. Initially, they went through an evaluation of their balance and functional mobility through the Berg Balance Scale (BBS), the ­Timed Up and Go (TUG) test, and a QoL test through the Parkinson's Disease Questionnaire (PDQ-39). The subjects also performed a test for determining the maximum load (one-repetition maximum) for the muscle groups trained. After the normality and homogeneity of the data were verified, the Student's t-test and Spearman correlation test were carried out. A significance level of p<0.05 was considered. We verified an improvement in balance (p=0.008) and QoL (p=0.013), and a negative correlation between balance and QoL (evaluation: r=-0.65 and p=0.05, revaluation: r=-0.82 and p=0.005). It was concluded that muscle strengthening was efficient in the improvement of balance and QoL in individuals with PD.