Evaluation of the performance of a castor-oil based formulation in limiting pesticide residues in strawberry crops

A study was made to evaluate the effect of a castor oil-based detergent on strawberry crops treated with different classes of pesticides, namely deltamethrin, folpet, tebuconazole, abamectin and mancozeb, in a controlled environment. Experimental crops of greenhouse strawberries were cultivated in five different ways with control groups using pesticides and castor oil-based detergent. The results showed that the group 2, which was treated with castor oil-based detergent, presented the lowest amount of pesticide residues and the highest quality of fruit produced

Determinação simultânea de cobalto e níquel Simultaneous determinations of nickel and cobalt: a review

<abstract language="eng">The simultaneous determination of cobalt and nickel is a classical analytical problem. A great number of reagents associated with several techniques of analysis have been applied to achieve this determination. In this review 117 references, which appeared between 1996-1980, are described and classified according to the technique applied

The effects of fillers on polyurethane resin-based electrical insulators

The increasingly widespread use of polymeric insulators in vehicle distributors and transmission systems has led to an ongoing quest for quality and low costs. This quest has, in turn, resulted in improved performance and cost benefits, brought about by the use of new polymeric and composite resins. Occasionally, however, while some properties are improved, others may show a loss of optimal performance. Therefore, to understand the behavior of fillers, such as carbon black, silica and mica added to castor oil-derived polyurethane resins, several thermal, mechanical and electrical tests were conducted on samples and insulators produced specifically for this purpose, using these new materials. The results of these tests clearly demonstrated that this type of resin and its composites can be used to manufacture indoor electrical insulators and that the fillers analyzed in this study improve or maintain the characteristics of the pure resins

Antiproliferative and proapoptotic effects of DODAC/synthetic phosphoethanolamine on hepatocellular carcinoma cells

Abstract Background Current studies have demonstrated that DODAC/PHO-S (Dioctadecyldimethylammonium Chloride/Synthetic phosphoethanolamine) liposomes induces cytotoxicity in Hepa1c1c7 and B16F10 murine tumor cells, with a higher proportion than PHO-S. Therefore, our aim was to evaluate the potential of DODAC/PHO-S to elucidate the mechanism of cell death whereby the liposomes induces cytotoxicity in hepatocellular carcinoma Hepa1c1c7, compared to the PHO-S alone. Methods Liposomes (DODAC/PHO-S) were prepared by ultrasonication. The cell cycle phases, protein expression and types of cell’s death on Hepa1c1c7 were analyzed by flow cytometry. The internalisation of liposomes, mitochondrial electrical potential and lysosomal stability were also evaluated by confocal laser scanning microscopy. Results After treatment with liposomes (DODAC/PHO-S), we observed a significant increase in the population of Hepa1c1c7 cells experiencing cell cycle arrest in the S and G2/M phases, and this treatment was significantly more effective to promote cell death by apoptosis. There also was a decrease in the mitochondrial electrical potential; changes in the lysosomes; nuclear fragmentation and catastrophic changes in Hepa1c1c7 cells. The liposomes additionally promoted increases in the expression of DR4 receptor, caspases 3 and 8, cytochrome c, p53, p21, p27 and Bax. There was also a decrease in the expression of Bcl-2, cyclin D1, CD90 and CD44 proteins. Conclusion The overall results showed that DODAC/PHO-S liposomes were more effective than PHO-S alone, in promoting cytotoxicity Hepa1c1c7 tumor cells, activating the intrinsic and extrinsic pathways of programmed cell death

Quantificação do linalol no óleo essencial da Aniba duckei Korstermans utilizando uma nova coluna capilar POLYH4-MD em Cromatografia Gasosa

In the present work a polyurethane polymer derived from castor oil was used as stationary phase for capillary gas chromatography. The polymer was obtained by reaction of hydroxylated compound and isocynate (NCO), forming urethane. Columns of 7 m x 0,25 mm were then coated with this stationary phase (film thickness of 0,25 µm) using static coating method. The Grob test was also performed. Samples of essential oil of the Aniba duckei Korstermans was then analysed in POLYH4-MD capillary column in order to evaluate its chromatographic perfomance. The linalool was found to be the major component and has been used as compound of departure for many important syntheses. Results show that the experimental columns give higher resolution and can be employed for analysis of essentials oils.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES

Propriedades da poliuretana derivada do óleo da mamona associada a fios de poliéster para uso em implante de tendões flexores da mão

In view of its use in implants of hand flexor tendons, this study evaluated the mechanical properties of elastomeric polyurethane derived from castor oil associated to polyester threads. Dumb-bell shaped specimens were cut out from poliurethane plaques obtained by polymerization of Q160 poliol and FN329 prepolymer, either plain or combined to polyester threads inside. disposed either parallel to each other or interwoven, ranging from one to seven, and added in increments of two to two. The specimens were submitted to traction in a universal testing machine and tested for the following parameters: rupture strength, ultimate tensile strength, deformation (elongation), resilience and modulus of elasticity. Three specimens per group were tested and, from the values obtained for each parameter, an average was calculated for statistical analysis. Results showed that the association with polyester threads decreased the polyurethane deformation ability, while increased its rupture strength, ultimate tensile strength, resilience and modulus of elasticity. Such increase was directly proportional to the increment in the number and interweaving of threads, being statistically significant for five and seven threads. In conclusion, when combined to polyester threads, the castor oil-derived elastomeric polyurethane proved an adequate material for manufacturing of hand flexor tendon implants.Com vistas a seu emprego na confecção de implantes de tendões flexores para a mão, foi realizado um estudo das propriedades mecânicas da poliuretana elastomérica derivada do óleo da mamona, associada a fios de poliéster. Corpos de prova foram recortados de placas de poliuretana, obtidas pela polimerização do poliol Q160 com o pré-polímero FN329; um grupo de corpos de prova foi de poliuretana pura; nos demais, esta foi associada a fios de poliéster dispostos longitudinalmente em seu interior, paralelamente ou trançados, em número variando de um a sete fios, com incrementos de dois a dois. Os corpos de prova foram submetidos a ensaios de tração em máquina universal de ensaios. Foram analisados os parâmetros força de resistênciaà ruptura, tensão máxima, deformação, resiliência e módulo de elasticidade. Para cada grupo foram testados três corpos de prova e, dos valores obtidos para cada parâmetro individualmente, foi obtida a média para análise estatística. Os resultados demonstraram que a associação dapoliuretana com os fios fez diminuir a capacidade de deformação da poliuretana pura, aumentando sua força de resistência, tensão máxima, resiliência e módulo de elasticidade, propriedades cujos valores aumentaram com o incremento do número e com o trançar dos fios, tendo sido significante com cinco e sete fios. Concluiu-se que, na forma associada, essa poliuretana constitui um material adequado para a confecção de implantes de tendão

Thermal, spectroscopic and DFT studies of solid benzamide

Thermogravimetry (TG), differential thermal analysis (DTA), differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR), and DFT theoretical calculations were used to study benzamide. The TG-DTA and DSC curves provided information concerning the melting point, evaporation and thermal stability of the compound. Using the FTIR technique it was possible to confirm the evaporation of the compound with no degradation. Density functional theory (DFT) at the 6-311++G (3df, 3dp) level, provided information regarding the energies involved in HOMO-LUMO transitions and the chemical stability of the compound

The effects of fillers on polyurethane resin-based electrical insulators

The increasingly widespread use of polymeric insulators in vehicle distributors and transmission systems has led to an ongoing quest for quality and low costs. This quest has, in turn, resulted in improved performance and cost benefits, brought about by the use of new polymeric and composite resins. Occasionally, however, while some properties are improved, others may show a loss of optimal performance. Therefore, to understand the behavior of fillers, such as carbon black, silica and mica added to castor oil-derived polyurethane resins, several thermal, mechanical and electrical tests were conducted on samples and insulators produced specifically for this purpose, using these new materials. The results of these tests clearly demonstrated that this type of resin and its composites can be used to manufacture indoor electrical insulators and that the fillers analyzed in this study improve or maintain the characteristics of the pure resins