1000 resultados para Espectrofotometria atômica
Análise físico-química do MTA e do cimento Portland associado a quatro diferentes radiopacificadores
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
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O trabalho teve como objetivo o desenvolvimento de uma metodologia de avaliacao qualitativa e quantitativa, com o uso de substancia tracadoras, nos estudos de deposicao em pulverizacao, com a possibilidade de variacao da tensao superficial da calda. Plantas de citros foram pulverizadas com solucao tracadora composta pelo corante Azul Brilhante na concentracao de 0,15% em mistura com o Saturn Yellow tambem a 0,15%, suspenso com o lignosulfonato Vixilperse a 0,015%. A pulverizacao foi realizada com turboatomizador Jacto, na velocidade de deslocamento de 2,8 km/h e volume de calda de 1830 L/ha. A tensao superficial da solucaotracadora pulverizada foi ajustada para 72,6 mN/m, mesma da agua, e com a reducao para 36,5 mN/m. Para as avaliacoes dos depositos, dividiu-se a planta em 12 setores, partes baixa, media e alta, coletando-se amostras nas partes externa e interna e nas posicoes frontal e perpendicular a pulverizacao. Em cada posicao de coleta na planta foram retiradas duas amostras de folhas, uma constituida de 10 folhas para avaliar a distribuicao e o deposito total de ambas as superficies das folhas, e outra com 6 folhas para avaliar a relacao do deposito individual entre as superficies inferior (abaxial) e superior (adaxial) das folhas. O escorrimento de calda para o solo foi avaliado colocando-se placas de petri, distanciadas de 20 cm entre si e linearmente, sob a projecao da copa, nos setores frontal e perpendicular a pulverizacao. Para cada tensao superficial testada coletou-se amostras em 5 plantas, considerando-se cada planta uma repeticao. A avaliacao qualitativa foi feita atraves da visualizacao da distribuicao do deposito sob luz ultravioleta e a determinacao da quantidade depositada atraves da espectrofotometria. A metodologia desenvolvida mostrou-se adequada para avaliacao dos depositos de pulverizacoes no campo, com a solucao tracadora, pela possibilidade de avaliar qualitativa e quantitativa
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Pós-graduação em Engenharia Mecânica - FEG
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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Pós-graduação em Ciência Animal - FMVA
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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Some authors consider minerals from organic sources more bioavailable for pig nutrition in comparison with inorganic sources. To evaluate the relative iron bioavailability from the organic source iron carbo-amino-phospho-chelate (ICAPC) to weanling piglets, it was conducted an experiment with 126 commercial piglets, using iron sulfate monohydrate (S) as standard. The experiment had a randomized block design with seven treatments (diet without adding specific source of iron, diet with 50, 100 and 150 ppm iron from S and diet with 50, 100 and 150 ppm iron from ICAPC), six replications and three animals per experimental unit. Performance parameters (average daily gain - ADG, feed: gain ratio - F:G) and blood variables (hemoglobin - Hb, hematocrit - Ht, transferrin - TR, latent iron-binding capacity - LIBC, total iron-binding capacity - TIBC, serum iron - Fe and transferrin saturation index - TSI) were evaluated. At the end of the experiment a piglet from each experimental unit was slaughtered and its liver and spleen removed for assessment of iron concentration by flame atomic absorption spectrometry (FAAS). The evaluated sources of iron yielded similar results for the variables of interest, but the increase in iron intake was followed by a linear increase in ADG, Hb, Ht, Fe and TSI as well as a linear decrease in the values of F:G, TR, LIBC and TIBC. Iron bioavailabilities from both ICAPC and S sources are similar for weanling piglets.
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One of the most primal ways of human work already known is the tessellation and ginning for the production of fabric and clothing - what used to be, back in those days, statement of power and status. The arrival of the Industrial Revolution - in the middle of the XVIII century at Britain - increased the textile industry production, and what used to be manufactured and hard to obtain, starts then to be produced in mechanical ways and large-scale. Despite all the boost given to the economy of an expanding capitalist market, it should be pointed out the consequences of this major industrialization, especially the environmental ones, more and more concerning nowadays. The emissions of waste - that sometimes could be toxic - in effluents can possibly contaminate the aquatic ecosystems, causing a huge damage to its fauna and flora, affecting therefore all the biodiversity, reaching inclusively the humans. To avoid these problems, a few strategies have been taking place in the attempt to eliminate - or at least reduce - the amount of dye found in the effluents, and as the textile industry constantly leaves waste, efficient methods - that present good results in a short period of time - with a low cost are needed. The present study will test the bioremoval capacity of yeast (Saccharomyces cerevisiae) in contact with dyes in a fix concentration, diluted in water with three different pH values. The tests will be done duplicate, and after the concentration analyses - made by spectrophotometry - it will be analyzed which pH shows major efficiency in the dye removal and what is the influence of the biomass in this process