Instituto Federal Of Brasilia

Planaltina, Brazil

Instituto Federal Of Brasilia

Planaltina, Brazil
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Roque F.,Instituto Federal Of Brasilia | Leao B.F.D.,University of Brasilia | Tidon R.,University of Brasilia
Annals of the Entomological Society of America | Year: 2017

Identifying cryptic species is a challenging but critical task for conservation biology because such identifications improve the resolution of taxonomic inventories and increase our ability to precisely assess the biodiversity of environments as well as the conservation status of rare species. To understand the temporal and spatial distribution of the cryptic species contained in the Drosophila willistoni subgroup, we re-examined all of the individuals of this subgroup identified in a previous work that analyzed drosophilids associated with a forest patch in the Brazilian Cerrado from December 2007 to November 2008. Each collection consisted of banana-baited traps distributed in three vertical strata of the forest (0-, 4-, and 8-m heights) at three horizontal positions (edge, transition between edge and river, and river area). Our results revealed that the specimens originally identified as D. willistoni consisted of three cryptic species: D. willistoni (n=1,344), D. paulistorum (n=1,001), and D. tropicalis (one male). Most D. willistoni and D. paulistorum specimens were collected during the rainy season on the ground of the edge forest patch. However, D. paulistorum was more temporally and spatially restricted than D. willistoni. Our findings confirm that these three cryptic species of the subgroup D. willistoni differ not only in abundance but also in ecological tolerance. This study contributes to the improved understanding of the Brazilian savanna communities, whose high levels of species richness and endemism are well documented for plants but poorly known for insects.


de Andrade Vilela W.,Ministerio da Integracao Nacional | Cicerelli R.E.,University of Brasilia | de Almeida T.,University of Brasilia | Neto G.B.S.,Instituto Federal Of Brasilia | Moura L.Z.,University of Brasilia
Boletim de Ciencias Geodesicas | Year: 2017

The São Francisco River Integration Project is an infrastructure work conducted by the Brazilian federal government, aiming to guarantee water resources security to 390 municipalities, benefitting about 12 million people that suffer with water scarcity in one of the driest regions in the country. This work presents the method and tools used to evaluate land suitability for rural resettlement of displaced families. All with the intent of mitigating socioeconomic impacts for one of the annex channels in the main project axis, considering legal and technical criteria. Using geoprocessing tools, 4490 hectares of land were effectively identified as best suited for this purpose, helping public managers to promptly decide the adequate course of action. © 2017, Universidade Federal do Parana. All rights reserved.


Correa P.C.,Federal University of Viçosa | Resende O.,IF Goiano | Garin S.A.,Public University of Navarra | Jaren C.,Public University of Navarra | De Oliveira G.H.H.,Instituto Federal Of Brasilia
Engenharia Agricola | Year: 2011

The present study aimed to determine the volumetric shrinkage rate of bean (Phaseolus vulgaris L.) seeds during air-drying under different conditions of air, temperature and relative humidity, and to adjust several mathematical models to the empiric values observed, and select the one that best represents the phenomenon. Six mathematical models were adjusted to the experimental values to represent the phenomenon. It was determined the degree of adjustment of each model from the value of the coefficient of determination, the behavior of the distribution of the residuals, and the magnitude of the average relative and estimated errors. The rate of volumetric shrinkage that occurred in bean seeds during drying is between 25 and 37%. It basically depends on the final moisture content, regardless of the air conditions during drying. The Modified Bala & Woods' model best represented the process.


Correa P.C.,Federal University of Viçosa | de Oliveira G.H.H.,Instituto Federal Of Brasilia | Baptestini F.M.,Federal University of Viçosa | Diniz M.D.M.S.,Federal University of Viçosa | da Paixao A.A.,Federal University of Viçosa
Chilean Journal of Agricultural Research | Year: 2012

Infrared dehydration is more advantageous than the convective system under similar conditions, and studying this process is important to further develop equipment and procedures. Thus, the aim of this work was to study the dehydration process of tomato (Solanum lycopersicum L.) slices obtained by infrared drying at three different maturity stages throughout two different procedures: Firstly, the drying model was determined by applying the mass and energy balances under wet bulb temperature for the constant drying rate period and secondly, the mass effective diffusion coefficient was determined throughout the experimental data and the theory of diffusion of the liquid phase for the decreasing drying rate period. Tomato fruits cv. Santa Cruz were used. Three maturity stages were selected: green (stage 1), orange (stage 2), and red (stage 3). Mathematical models frequently used to represent drying of agricultural products were fitted to the experimental data of tomato drying. The effective diffusion coefficient was obtained by adjusting the liquid diffusion mathematical model to the experimental data of the descending period of dehydration. The two-term model was the best one to represent the tomato dehydration process. The critical moisture content for tomato dehydration was 2.97 kgw kgdm -1. There is an initial dehydration period in which the drying rate reaches its maximum (approximately 1.05 kgw kgdm -1, about 3 min). Three different methods were used to obtain values of the effective diffusion coefficient, including the finite element method, which had the lowest values for the least square sum of deviation 1.00 × 10-7 m2 s-1. The global coefficient of heat transfer was 12.45 W m-2K-1, and the global coefficient of mass transfer was 0.0105 m s-1.


de Oliveira G.H.H.,Instituto Federal Of Brasilia | Correa P.C.,Federal University of Viçosa | de Souza Santos E.,Federal University of Viçosa | Treto P.C.,Federal University of Viçosa | Diniz M.D.M.S.,Federal University of Viçosa
International Journal of Food Science and Technology | Year: 2011

The desorption isotherms and thermodynamic properties of cocoa beans were obtained during the drying process of this product. The isotherms were determined by dynamic method for various temperature (25, 35, 45 and 55°C) and relative humidity (RH) conditions (30, 40, 50, 60, 70 and 80%). Equilibrium moisture content data were correlated by the Guggenheim-Anderson-de Boer (GAB) model, which presented good fit to the data, according to statistical procedures. Equilibrium moisture content ranged from 5.90 to 16.67d.b.; it increased with an increment in the RH and decreased with increased temperature at a constant RH. Enthalpy values for each model coefficient were encountered, ranging from -90.05 to 545.96kJkg-1. The integral isosteric heat of desorption and differential entropy increased with decreased equilibrium moisture content, a tendency also found for Gibbs free energy. © 2011 The Authors. International Journal of Food Science and Technology © 2011 Institute of Food Science and Technology.


da Silva R.A.,Instituto Federal Of Brasilia | Quintela E.D.,Embrapa Arroz e Feijao | Mascarin G.M.,Embrapa Arroz e Feijao | Pedrini N.,CONICET | And 2 more authors.
Journal of Invertebrate Pathology | Year: 2015

Eggs, nymphs (1st-5th instar) and adults of Tibraca limbativentris were challenged by conidial suspensions of its major fungal pathogen Metarhizium anisopliae in order to assess their susceptibility. The role of chemical defensive compounds from exocrine secretions produced by both nymphs and adults were examined for their participation on M. anisopliae infection. Although insect susceptibility to M. anisopliae followed a dose-dependent manner, adults followed by older nymphs displayed the highest resistance. Eggs were highly susceptible showing >96% fungal infection. Crude extracts isolated from metathoracic scent gland and dorsal abdominal glands of adults and nymphs, respectively, showed fungistatic effects by impairing spore germination, vegetative growth and sporulation. Gas chromatography-mass spectrometry analysis of these extracts revealed that the major components were short-chain hydrocarbons (C10-13) and unsaturated aldehydes. In vitro tests with the corresponding synthetic standards indicated compounds with greater antifungal activity including (E)-2-hexenal, (E)-2-octenal, and (E)-2-decenal, with the latter being the most deleterious to fungal fitness. We demonstrated that differential susceptibility of the rice stalk stink bug to M. anisopliae infection is age-specific and partly mediated by fungistatic properties of aldehydes, which are produced by scent glands of both nymphs and adults. © 2015 Elsevier Inc.


PubMed | CONICET, Instituto Federal Of Brasilia, Embrapa Arroz e Feijao and Federal University of Goais
Type: | Journal: Journal of invertebrate pathology | Year: 2015

Eggs, nymphs (1st-5th instar) and adults of Tibraca limbativentris were challenged by conidial suspensions of its major fungal pathogen Metarhizium anisopliae in order to assess their susceptibility. The role of chemical defensive compounds from exocrine secretions produced by both nymphs and adults were examined for their participation on M. anisopliae infection. Although insect susceptibility to M. anisopliae followed a dose-dependent manner, adults followed by older nymphs displayed the highest resistance. Eggs were highly susceptible showing >96% fungal infection. Crude extracts isolated from metathoracic scent gland and dorsal abdominal glands of adults and nymphs, respectively, showed fungistatic effects by impairing spore germination, vegetative growth and sporulation. Gas chromatography-mass spectrometry analysis of these extracts revealed that the major components were short-chain hydrocarbons (C10-13) and unsaturated aldehydes. In vitro tests with the corresponding synthetic standards indicated compounds with greater antifungal activity including (E)-2-hexenal, (E)-2-octenal, and (E)-2-decenal, with the latter being the most deleterious to fungal fitness. We demonstrated that differential susceptibility of the rice stalk stink bug to M. anisopliae infection is age-specific and partly mediated by fungistatic properties of aldehydes, which are produced by scent glands of both nymphs and adults.


de Medeiros E.N.M.,Instituto Federal Of Brasilia | Sposto R.M.,University of Brasilia | de Araujo Neves G.,Federal University of Campina Grande | Menezes R.R.,Federal University of Campina Grande
Revista Escola de Minas | Year: 2014

This paper presents a technical feasibility analysis of the incorporation of Rice Husk Ash (RHA), Sludge from Water Treatment Station (SWTS) and Wood Ash (WA) in clay for the mass used in ceramic coating. The methodology involved analyzing the technological properties of various compositions. Samples were prepared for pressing, with compositions from 0 to 50% waste and 50 to 100% clay. The sintering was carried out in a muffle furnace. The properties studied were: solubility and leaching (environmental characterization), water absorption and rupture strength modulus. It was concluded that the best condition was the use of up to 25% of the residuals at temperatures of 1000 °C, 1100 °C and 1150 °C. © 2014, Escola de Minas. All right reserved.


Da Silva F.B.V.,University of Brasilia | Da Silva F.B.V.,Instituto Federal Of Brasilia | Oliveira F.A.,University of Brasilia | Barbosa M.A.A.,University of Brasilia
Journal of Chemical Physics | Year: 2015

The thermodynamics and kinetics of the one dimensional lattice gas with repulsive interaction are investigated using transfer matrix technique and Monte Carlo simulations. This simple model is shown to exhibit waterlike anomalies in density, thermal expansion coefficient, and self-diffusion. An unified description for the thermodynamic anomalies in this model is achieved based on the ground state residual entropy which appears in the model due to mixing entropy in a ground state phase transition. © 2015 AIP Publishing LLC.


da Mata R.A.,Federal University of Goais | Roque F.,Instituto Federal Of Brasilia | Tidon R.,University of Brasilia
Natureza e Conservacao | Year: 2015

The relevant scales over which specific communities vary must be identified to address fundamental ecological questions and to advance the conservation of biological diversity. In this study, the variation among drosophilid assemblages associated with forests was quantified at a large temporal-spatial scale. Our results are based on data collected in four conservation units (CUs) in the Brazilian savanna across four seasons and two years. The primary component of variation occurred at the temporal scale: it was three times greater than that of the spatial scale. Significant variability was also found in the interaction between seasons and CUs. Measuring the temporal and spatial variability of drosophilid diversity in forests contributed to the improvement of the methodological framework supporting such assemblages as bioindicators and provided important insights into the mechanisms behind the dynamic patterns in time and space that ultimately can improve our understanding of Cerrado biodiversity. © 2015 Associação Brasileira de Ciência Ecológica e Conservação.

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