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Ipameri, Brazil

Rodrigues F.,UEG | De Magalhaes J.V.,Nucleo de Recursos Geneticos e Desenvolvimento de Cultivares NRGC | Pinto C.A.B.P.,Federal University of Lavras | Tardin F.D.,Nucleo de Recursos Geneticos e Desenvolvimento de Cultivares NRGC | Schaffert R.E.,Nucleo de Recursos Geneticos e Desenvolvimento de Cultivares NRGC
Revista Caatinga | Year: 2014

The optimization of nutritional efficiency is critical to increase productivity and reduce production costs. However, the identification of lines with greater efficiency and responsiveness to phosphorus is of great importance, with the in intention to join the hybrid, these traits at once and, moreover, the best way to select them. Thus, the objective of this study was to evaluate which characters should be considered in the selection of genotypes efficient and responsive to phosphorus in sorghum. The correlations were split into direct and indirect basic variables of efficiency and responsiveness to phosphorus through path analysis. The character that most influenced the efficiency of sorghum lines to phosphorus was harvest index to utilization efficiency and dry matter to absorption efficiency and use, under conditions of stress. Under conditions of adequate phosphorus fertilization, the trait with the greatest influence for evaluation of responsiveness was dry grain mass to the apparent recovery efficiency, physiological and agronomic. © 2014, Universidade Federal Rural do Semi-Arid. All rights reserved.

Pacco H.C.,UEG | Rinaldi M.M.,Embrapa Cerrados | Sandri D.,University of Brasilia
Horticultura Brasileira | Year: 2014

The objective of this research was to determine the yield and postharvest quality of tomato “Dominador” produced inside and outside the greenhouse, irrigated by the system of surface and subsurface drip with wastewater and natural water. The experimental design was a randomized block 3x2, the portions being formed by the water quality (wastewater, water for conventional fertigation and natural water), with four repetitions. There was no significant effect of cultivars within and outside the greenhouse on the productivity index, fruit size and quality, except in the ratio of soluble solids/titratable acidity, where the highest value (2.46) was for growing inside the greenhouse, and significant increases (102%) during the storage period (fourteen days), indicating a superior quality during the storage period. The pH of the fruits produced within the greenhouse ranged from 3.95 to 4.31, and values for tomatoes produced outside the greenhouse ranged from 4.00 to 4.22 in pH during the storage. The soluble solids increased and titratable acidity was reduced during the storage period for all treatments. The tomato had shelf-life of seven days for all treatments in both cultivation environments, and stored at 27°C and 60% relative humidity. © 2014 Sociedade de Olericultura do Brasil. All rights reserved.

Giongo P.R.,UEG | Vettorazzi C.A.,University of Sao Paulo
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2014

This study aimed at to estimate the surface albedo in the Corumbataí River Basin, State of São Paulo, Brazil, using TM-Landsat 5 images, together with the Digital Terrain Model (DTM), in order to take into account the terrain slope, as well as the Mapping Evapotranspiration at High Resolution and with Internalized Calibration (METRIC) model. Available ancillary data from a meteorological station located in the study area, and ten images from 01/02/2009, 04/02/2010, 22/04/2009, 24/05/2009, 12/06/2010, 08/07/2008, 30/07/2010, 31/08/2010, 13/09/2009 and 31/10/2009, were also used. Te use of TM-LANDSAT 5 images with the METRIC model and the DTM, allowed to identify the spatial and temporal variations of different coverages on the mapping of surface albedo of the Corumbataí River Basin. Te data were consistent with those presented in the literature for sugarcane, water, pasture and eucalypt, for satellite images of clear-sky days.

De Avila R.,State University of Goias | Ascheri D.P.R.,UEG | Ascheri J.L.R.,Embrapa Agroindustria de Alimentos
Boletim Centro de Pesquisa de Processamento de Alimentos | Year: 2012

In this work, were determined the physical and chemical properties of the comels of mangarito starch and some properties of biodegradable films from starch and glycerol. Were determined the mass and the major and minor diameters and chemical composition of the comels. Were also determined the chemical composition and calorific value of the extracted starch, and its thermal and pasting properties. The morphology and size of their granules were analyzed. The films were prepared using the casting technique by varying the amount of glycerol and the mass of filmogenic solution according to a central composite factorial design. From the obtained films were studied the appearance, thickness, permeability and solubility. Was applied an analysis of variance for a second degree polynomial model and the desirability function for the optimization. The average weight of comels was 3.5 g with major and minor diameters of 23 and 15 μm respectively, being mainly constituted of granules with rounded 12.5 μm in diameter. The starch paste presented good stability under heat and mechanical stirring and great tendency to retrogradation. Considering as desirable the factors low thickness and permeability and high solubility, films made with 10% glycerol and 24.73 g of filmogenic solution would comply better to these characteristics.

Sodre J.M.,UEG | Longo E.,Sao Paulo State University | Taft C.A.,Brazilian Center for Research in Physics (CBPF) | Martins J.B.L.,University of Brasilia | dos Santos J.D.,UEG
Comptes Rendus Chimie | Year: 2016

Nanotube properties are strongly dependent on their structures. In this study, gallium nitride nanotubes (GaNNTs) are analyzed in armchair and zigzag conformations. The wurtzite GaN (0001) surface is used to model the nanotubes. Geometry optimization is performed at the PM7 semiempirical level, and subsequent single-point energy calculations are carried out via Hartree-Fock and B3LYP methods, using the 6-311G basis set. Semiempirical and ab initio methods are used to obtain strain energy, charge distribution, dipole moment, |HOMO-LUMO| gap energy, density of states and orbital contribution. The gap energy of the armchair structure is 3.82 eV, whereas that of the zigzag structure is 3.92 eV, in agreement with experimental data. © 2016 Académie des sciences.

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