Thermophysical properties of cotton, canola, sunflower and soybean oils as a function of temperature

Vegetable oils are used in the industry of processed food, including deep-fat frying. This work determined data on the thermophysical properties of cotton, canola, sunflower, corn, and soybean oils. Thermal conductivity, heat capacity, density, and viscosity were measured within the temperature range of 299.15-433.15 K. The data showed that the temperature influenced the thermophysical properties of the oils studied. The developed correlations could be used to predict these properties within the range of temperatures studied. © 2013 Copyright Taylor and Francis Group, LLC.

Enzymatic transesterification of soybean oil with ethanol using lipases immobilized on highly crystalline PVA microspheres

Polyvinyl alcohol (PVA) microspheres with different degree of crystallinity were used as solid supports for Rhizomucor miehei lipase immobilization, and the enzyme-PVA complexes were used as biocatalysts for the transesterification of soybean oil to fatty acid ethyl esters (FAEE). The amounts of immobilized enzyme on the polymeric supports were similar for both the amorphous microspheres (PVA4) and the high crystalline microspheres (PVA25). However, the enzymatic activity of the immobilized enzymes was depended on the crystallinity degree of the PVA microspheres: enzymes immobilized on the PVA4 microspheres have shown low enzymatic activity (6.13 U mg-1), in comparison with enzymes immobilized on the high crystalline PVA25 microspheres (149.15 U mg-1). A synergistic effect was observed for the enzyme-PVA25 complex during the transesterification reaction of soybean oil to FAEE: transesterification reactions with free enzyme with the equivalent amount of enzyme that were immobilized onto the PVA25 microspheres (5.4 U) have yielded only 20% of FAEE, reactions with the pure highly crystalline microsphere PVA25 have not yielded FAEE, however reactions with the enzyme-PVA25 complexes have yielded 66.3% of FAEE. This synergistic effect of an immobilized enzyme on a polymeric support has not been observed before for transesterification reaction of triacylglycerides into FAEE. Based on ATR-FTIR, 23Na- and 13C-NMR-MAS spectroscopic data and the interaction of the polymeric network intermolecular hydrogen bonds with the lipases residual amino acids a possible explanation for this synergistic effect is provided. © 2013 Elsevier Ltd. All rights reserved.

Yield and mineral nutrition of soybean, maize, and congo signal grass as affected by limestone and slag

The objective of this work was to evaluate the efficiency of superficial applicationof limestone and slag, and their effects on soil chemical attributes and on yield and mineral nutrition of soybean, maize, and Congo signal grass (Urochloa ruziziensis). The experiment was carried out in a Rhodic Hapludox under no tillage system. The treatments consisted of the use of limestone or slag (silicates of calcium and magnesium) to correct soilacidity, and of a control treatment without the use of soil correctives. Rates were calculated in order to raise soil base saturation up to 70%. Soybean was sown in November 2006and maize in December 2007. Congo signal grass was sown right after the harvests of soybean and maize, and it was cropped during the offseasons. Soil chemical attributes were evaluated at 6, 12, and 18 months after the application of the corrective materials. Slag isan efficient source for soil acidity correction, being able to raise the exchangeable base levels in the soil profile faster than lime. Both limestone and slag increase dry matter yield of Congo signal grass, and grain yield of soybean and maize. Slag is more effective in improving maize grain yield.

Teor de clorofila, danos oxidativos e qualidade de sementes de soja

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Dessecação com Glyphosate em pré-colheita e qualidade fisiológica de sementes de soja

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Dano por embebição em sementes de soja em função do teor de água inicial, cultivar e local de produção

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Detecção do gene de peroxidase em sementes de soja pela reação da polimerase em cadeia (PCR)

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

Condicionamento fisiológico de sementes, componentes produção e produtividade de soja

Pós-graduação em Agronomia (Agricultura) - FCA

Infestação e danos de Dichelops melacanthus (Dallas, 1851) (Heteroptera: Pentatomidae) em híbridos transgênicos e convencionais de milho, submetidos ao controle químico

Pós-graduação em Agronomia (Entomologia Agrícola) - FCAV

Diversidade genética com base em dados fenotípicos avaliada em diferentes populações e linhagens avançadas de soja

Pós-graduação em Agronomia (Genética e Melhoramento de Plantas) - FCAV

Parâmetros genéticos em populações de soja derivadas de cruzamentos simples e múltiplos, conduzidas por três diferentes métodos de avanço de gerações

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Estabilidade fenotípica de genótipos Precoces de soja com aptidão com rotação com cana-de-açucar

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Valor nutritivo, pela Tilápia do Nilo, do farelo de nabo forrageiro

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Teste de condutividade elétrica e presença de patógenos em sementes de soja

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

População de plantas, ferrugem asiática e produção de soja

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)