234 resultados para ácidos orgânicos


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A presente invenção se refere a quatro compostos de prata com os ácidos glicólico, mandélico, málico e tartárico, suas composições, processos de preparação e uso como agentes micobactericidas.

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A presente invenção trata de um processo de biorremediação de materiais sólidos contaminados com compostos orgânicos clorados, utilizando fungos basidiomicetos lignocelulolíticos caracterizado por compreender as seguintes etapas: a. produção de inóculos apresentando uma ou mais espécies de fungos basidiomicetos lignocelulolíticos.

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The objective of this study was to investigate the effect of the combined use of Azospirillum brasilense, humic acid and different levels of nitrogen on agronomic characteristics of wheat under greenhouse conditions. The experiments were installed on May 21, 2011 and proceeded to harvest on September 13, 2011. The experimental design was a randomized complete block in a 4 x 4 factorial design with four replications. The first factor relates to the combination of strain Ab-V5 of A. brasilense with humic acids, with the following treatments: control, Ab-V5, humic acid and Ab-V5 + humic acid and the second factor refers to nitrogen levels (0, 30, 60 and 90 kg ha-1 N). Most variables in the analysis had a positive linear effect of treatments depending on nitrogen fertilization, and only for variable weight of hundred grains, the negative effect was linear. There were no significant differences between the variances in grain production. It was concluded that the combined use of Ab-V5 + humic acid promotes the production mainly of dry leaves and are not responsive to nitrogen fertilizer for other productive components under study, as well as grain yield.

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The objective of the present study was to evaluate changes in chemical characteristics of soil and yield response of lettuce fertilized with organic compounds from waste and/or raw materials. Treatments were arranged in a randomized block design in a 5 x 4 factorial scheme, with five types and four doses of organic compounds, with four replications, applied to plants grown in pots for 35 days under greenhouse conditions. In the soil, the evaluated variables were: organic matter content, nutrient content -P, K+, Na+, Ca2+ and Mg+2, potential acidity (H+ + Al3+), sum of bases (S value), cation exchange capacity (CEC), base saturation (V%) and pH. In plants, dry matter yield of shoot was assessed. The addition of organic compounds increased the dry matter yield of the lettuce and organic matter content in soil, favoring the increase of phosphorus and exchangeable sodium in soil, also, increase in calcium and potassium were observed, with use of some compounds. Compounds 3 (domestic, urban and industrial residues) and 4 (Commercial Composto - Greenworld), mainly, improve the chemical characteristics of soil and reduce potential acidity.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Pós-graduação em Biotecnologia Animal - FMVZ

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Pós-graduação em Química - IQ

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Pós-graduação em Genética e Melhoramento Animal - FCAV

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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The objective was to evaluate fatty acids composition of the back fat in loin meat (Longissimus muscle) from Nellore and Canchim young bulls. The animals were finished at feedlot and received sugar cane diets with two concentrate levels (40 and 60% of dry matter). The concentrates were formulated with sunflower grains, corn, soybean meal, dry sugar cane yeast, urea and mineral mixture. The experimental design was a completely randomized design with a 2x2 factorial arrangement (genetic group x concentrate level), and the results were submitted to the variance analysis and means compared by Tukey test at 5% probability, when the interaction was significant. The loin backfat of Nellore bulls had higher concentration of conjugated linoleic acids than Canchim bulls (0.86 and 0.59%, respectively). On the other hand, the loin back fat of Canchim bulls had higher concentrations of estearic (17.07%) and linoleic acids (2.40%) and polyunsaturated fatty acids than Nellore bulls, that showed values of 13.47 and 1.44%, respectively. The Nellore and Canchim loin back fat presents significant amounts of beneficial fatty acids to human health. Levels of 40 and 60% of concentrate in the diet did not alter the fatty acids composition of loin backfat.

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O objetivo do presente trabalho é o entendimento da dinâmica do mercado dos alimentos orgânicos no Brasil, sua cadeia produtiva e as relações comerciais estabelecidas especificamente com a União Européia. Apesar do segmento orgânico crescer a altas taxas ao redor do mundo, ainda é uma temática (promissora) pouco estudada nacionalmente, o que dificulta o desenvolvimento de processos que poderiam diminuir os entraves enfrentados pelos produtores orgânicos. Inicialmente situando o leitor sobre as origens do cultivo orgânico e apresentando o panorama mundial atual, o trabalho entra no cenário nacional discutindo o perfil do produtor, o paralelo entre insumos tradicionais e aqueles específicos para a produção orgânica, além das dificuldades de financiamento em âmbito nacional. Em seguida, discute-se questões relativas à comercialização: qual o perfil do produtor e quais os sistemas de distribuição da produção orgânica nacional e internacional; o porquê dos preços de produtos orgânicos exibirem margens de lucro tão altas; de onde vem a necessidade de certificar a produção, quais as principais certificadoras e seus métodos de atuação. A partir deste embasamento, pode-se trabalhar, então, as relações comerciais estabelecidas entre o Brasil e a União Européia, bloco de destino de mais de 70% da produção orgânica nacional; trata-se, então, das leis e das certificações necessárias para efetuar as exportações; dos principais produtos exportados dentro do segmento orgânico e das 19 empresas responsáveis por essas exportações. Percebe-se, por fim, que um dos principais entraves ao desenvolvimento do segmento ainda é a falta de investimentos em P&D, pois a carência de dados sistematizados e pesquisas em geral acabam por desestimular tanto produtores quanto consumidores em busca de informações sobre esse mercado pouco evidenciado nacionalmente

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During the twentieth century the inorganic electronics was largely developed being present in various industrial equipment or household use. However, at the end of that century were verified electronic properties in organic compounds, giving rise to the field of organic electronics. Since then, the physical properties of elementary devices such as diodes and organic transistors have been studied. In this work was studied the properties of diode devices fabricated with a semiconductor polymer, the poly-o-methoxyaniline (POMA). Devices containing electrodes of Au and Al were fabricated with semiconductor polymer of different doping levels. We found that the rectifying behavior for the heterojunctions metal/polimer are reached only for high doping level (with conductivity greater than 1,77. 10-9 S / cm), which gives the devices characteristic of a Schottky diode. The rectifying behavior was observed for electric fields of low magnitude, below the operating field (~ 600 V/cm), while for electric field greater than 600 V/cm the a linear behavior I vs.V was obtained. We determined that this Ohmic behavior arises from the charge transport over the volume of the semiconductor material after the lowering of the metal/semiconductor barrier. In devices with weakly doped semiconductor, the electrical resistance of the volume becomes high and the process of charge transportation is dominated by the volume, for any intensity of the applied electric field