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Guimaraes I.C.O.,Federal University of Lavras | Pereira J.,Centro Tecnologico Do Sul Of Minas Ctsm | Cornelio V.M.O.,Federal University of Alfenas | Batista L.R.,Centro Tecnologico Do Sul Of Minas Ctsm | Ferreira E.B.,Federal University of Alfenas
Ciencia e Agrotecnologia | Year: 2012

Owing to its chemical composition and production chain, rice is susceptible to contamination by fungi. Among other techniques, the application of gamma radiation has been suggested as a method to ensure food safety. However, such radiation can alter the chemical composition of the food. Thus, the objective of the present work is to evaluate the centesimal composition, caloric value, pH, total titratable acidity, and coloration of polished white rice subjected to different doses of Co60 gamma radiation (0 kGy, 6.5 kGy, and 7.5 kGy). The results demonstrated that while gamma radiation did not cause significant alterations in the centesimal composition, caloric value, and titratable acidity of the rice, increasing doses substantially decreased the pH and intensified the coloration. Under controlled radiation conditions, a 6.5-kGy dose can render rice safe for consumption without significantly compromising its physical and physicochemical properties. Source

de Oliveira M.C.,Federal University of Lavras | Neto J.V.,Empresa de Pesquisa Agropecuaria de Minas Gerais Epamig | Pio R.,Federal University of Lavras | de Oliveira A.F.,Centro Tecnologico Do Sul Of Minas Ctsm | Ramos J.D.,Federal University of Lavras
Ciencia e Agrotecnologia | Year: 2010

Semi hardwood cutting was colletecd in the medium portion of the 'Ascolano 315' olive trees, prepared with 12 cm in length and four leaves, treated or not with 3000 mg L-1 of IBA by five seconds. The experiment was conducted in a greenhouse, with a system of intermittent nebulization. The cutting was placed in propagation supports, containing perlite as a substrate. Before the plantation of the cutting, organic fertilizers Biofertilizante and Nippoterra were applied in the proportion: 0, 20, 40 and 60 mL L-1. The products were applied in the experimental portions in a single dose. After 58 days, the percentage of cutting with callus, taken root, taken root and/or with callus, average number of roots and average length of the roots were evaluated. The 40 mL L-1 of Biofertilizante gave the best results, with IBA. Source

Guimaraes I.C.O.,Federal University of Lavras | Pereira J.,Federal University of Lavras | Cornelio V.M.O.,Centro Tecnologico Do Sul Of Minas Ctsm | Batista L.R.,Federal University of Lavras | Ferreira E.B.,Federal University of Alfenas
Ciencia e Agrotecnologia | Year: 2013

The culinary quality of rice directly results in its market value and consumer acceptance. Thus, the present study evaluated the effect of gamma irradiation on the properties of the polished white rice starch, as well as their characteristic pulp. Doses of 6.5 kGy and 7.5 kGy did not alter the microstructure of rice starch granules, but interfered with rheological properties when compared to the control treatment, resulting in a reduction of the maximum and final viscosity and retrogradation. Since the microstructural and rheological properties within the values associated with rice quality, it was inferred that gamma irradiation did not alter the decisive characteristics for the acceptability of this cereal. Source

Iori P.,Federal University of Lavras | Dias Junior M.S.,Federal University of Lavras | Ajayi A.E.,Federal University of Technology Akurre | Guimaraes P.T.G.,Centro Tecnologico Do Sul Of Minas Ctsm | And 2 more authors.
Ciencia e Agrotecnologia | Year: 2013

Precompression stress is an important property for assessment of tropical soil structure sustainability and is often determined in laboratory tests. The objective of this study was to compare the load bearing capacity models obtained with controlled moisture in laboratory and those obtained with natural field moistures determined a long one year. The evaluation of soil structural sustainability follows four distinct steps: soil sampling in the field, uniaxial compression test of the samples in the laboratory, determination of precompression stress and estimation of the load bearing capacity models. Laboratory estimates of precompression stress were obtained from moisture controlled in laboratory and from natural moisture determined in a field a long one year. In this process, the soil samples were saturated by capillarity with distilled water in laboratory, and after 48 hours, the samples were air dried to obtain the different moisture contents. Then, the precompression stress was determined for this both conditions. To verify if the load bearing capacity models obtained with controlled moisture in laboratory may represent the load bearing models obtained with natural field moisture, these models were compared using the homogeneity test procedure. It was observed that 75% of field models analyzed were similar to the laboratory models. Thus, due to the similarity on the load-bearing capacity models obtained using natural (field) or controlled (laboratory) moisture contents, the assessment of the soil structure sustainability can be done using both methods. Source

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