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Campo Mourão, Brazil

de Vasconcelos F.S.,Faculdade Integrado de Campo Mourao | de Vasconcelos E.S.,West Parana State University | Balan M.G.,State University of Maringa | Silverio L.,Faculdade Integrado de Campo Mourao
Revista Ciencia Agronomica | Year: 2012

This work was carried out with the aim of evaluating the development and productivity of the BRSPiabiru variety of quinoa when sown on different dates during the off-season at Campo Mourao, PR. Six sowing dates were evaluated, namely: March 18, 2008; April 2, 2008; April 17, 2008; May 2, 2008; May 17, 2008; and June 10, 2008. The culture indices evaluated were the number of days to flowering, the number of days to maturity, plant height at maturity, and productivity. The experiment was conducted in a complete-block design with random treatments and four replications. The results indicate that the seeding date had an influence on the number of days to flowering, number of days to maturity, plant height at maturity, and productivity. The greatest plant height, together with the highest productivity for quinoa were obtained on March 18. Source

Guerra N.,Federal University of Santa Catarina | Oliveira Junior R.S.,State University of Maringa | Constantin J.,State University of Maringa | Oliveira Neto A.M.,Federal University of Pelotas | And 3 more authors.
Planta Daninha | Year: 2016

Herbicides aminocyclopyrachlor and indaziflam are under development in Brazil. Information about the behaviors in Brazilian soils and climate is scarce. Thus, the present work has aimed to evaluate the persistence of biological activity and leaching potential of aminocyclopyrachlor and indaziflam in contrasting textured soils by means of bioassays. For the evaluation of persistence, four experiments were performed, in which soils with different textures were studied in different time periods between herbicide application and bioindicator sowing (beet and soybeans). To determine leaching potential, three blades of rainfall (0, 30 and 60 mm) were simulated, each constituting a single experiment in soils with different textures and five bands of depth in the columns. The bioindicator used for the leaching tests was beet. The persistence of biological activity of aminocyclopyrachlor and indaziflam was greater than 150 days. In clayey soil there was less persistent aminocyclopyrachlor than in the loam texture. For indaziflam there was no difference in persistence between the two soils. Regarding the leaching potential, it was observed that the precipitations have the capacity to interfere with the leaching of herbicides aminocyclopyrachlor and indaziflam. Aminocyclopyrachlor has greater potential for leaching than indaziflam. The first one has its mobility increased when applied to soil of loam texture in relation to very clayey soil. As for indaziflam, marked differences between soils with different textures have not been noticed. © 2016, Sociedade Brasileira da Ciencia das Plantas Daninha. All Rights Reserved. Source

Moreira W.H.,State University of Maringa | Betioli Jr. E.,State University of Maringa | Petean L.P.,Faculdade Integrado de Campo Mourao | Tormena C.A.,UEM | And 3 more authors.
Revista Brasileira de Ciencia do Solo | Year: 2012

The trampling of grazing animals can compact the surface layers and affect the physical quality of soils in crop-livestock systems (ICL). The hypothesis of this study is that increased trampling from animal grazing of oats and ryegrass reduces the soil physical quality of an Oxisol under no-tillage with ICL. The purpose of this study was to quantify bulk density (Bd), air-filled porosity (εa), soil air permeability (Ka), soil resistance to penetration (SR) and estimate an index of pore continuity from the linear relationships between εa and Ka. In the experimental area in Campo Mourao - PR, with ICL under no-tillage, soybean or corn was grown as cash crops and oat plus ryegrass as forage for grazing. The treatments were four grazing heights (7, 14, 21, and 28 cm) and an ungrazed control. From each treatment, 20 undisturbed samples were collected from the layers 0-7.5 and 7.5-15 cm. There were no significant differences in Bd, εa and Ka between the control and the grazed treatments. In the 0-7.5 cm layer, the mean Ka values were similar between treatments. After eight years of ICL, the BD, εa and Ka did not confirm the hypothesis that intensification of grazing reduces the soil physical quality. However, SR showed differences between the control and grazed treatments, with restrictive SR values down to a depth of 15 cm, suggesting that increasing the grazing intensity reduces the soil physical quality. Source

De Souza Silva F.M.,Faculdade Integrado de Campo Mourao | Rocha Alves Da Silva M.H.,State University of Maringa | Bracht A.,State University of Maringa | Eller G.J.,State University of Maringa | And 2 more authors.
Molecular and Cellular Biochemistry | Year: 2010

Although metformin has been used to treat type 2 diabetes for several decades, the mechanism of its action on glucose metabolism remains controversial. To further assess the effect of metformin on glucose metabolism this work was undertaken to investigate the acute actions of metformin on glycogenolysis, glycolysis, gluconeogenesis, and ureogenesis in perfused rat livers. Metformin (5 mM) inhibited oxygen consumption and increased glycolysis and glycogenolysis in livers from fed rats. In perfused livers of fasted rats, the drug (concentrations higher than 1.0 mM) inhibited oxygen consumption and glucose production from lactate and pyruvate. Gluconeogenesis and ureogenesis from alanine were also inhibited. The cellular levels of ATP were decreased by metformin whereas the AMP levels of livers from fasted rats were increased. Taken together our results indicate that the energy status of the cell is probably compromised by metformin. The antihyperglycemic effect of metformin seems to be the result of a reduced oxidative phosphorylation without direct inhibition of key enzymatic activities of the gluconeogenic pathway. The AMP-activated protein kinase cascade could also be a probable target for metformin, which switches on catabolic pathways such as glycogenolysis and glycolysis, while switches off ATP consuming processes. © 2010 Springer Science+Business Media, LLC. Source

Maggioni D.,Faculdade Integrado de Campo Mourao | Do Prado I.N.,State University of Maringa | Zawadzki F.,State University of Maringa | Valero M.V.,State University of Maringa | And 4 more authors.
Semina:Ciencias Agrarias | Year: 2012

This study was carried out to evaluate the effect of genetic groups and carcass fat thickness levels on unfreeze losses (UFL), cooking losses (COL), pH, shear force (SF), frequency and diameters of slow-twitch-oxidative and red color (SO), fast-twitch-glicolytic and intermediate color and fast-twitch-glycolitic and white color (FG) on Longissimus muscle of bulls finished in feedlot. It were evaluated NEL - Nellore; LIN - 1/2 Limousin + 1/2 Nellore and RAN - 1/2 Angus + 1/2 Nellore genetic groups slaughtered with fat thickness levels of 3 or 5 mm. There was an interaction between genetic group RAN and fat thickness levels to the characteristics of UFL, COL, pH, SF and redness. The NEL produced meat darker than the crossbred, and had higher ultimate pH. However, the meat of these animals had lower UFL, COL and SF when compared to crossbred. Bulls RAN had the highest frequency of fast oxidative glicolytic fiber and lowest in slow-twitch oxidative fibers, and larger diameters for these fibers. Difference in meat quality among genetic groups are found in the smallest fat thickness levels of the carcass, while these differences cease to exist when the slaughter occurs with higher fat thickness levels. Fat thickness levels did not affect on meat quality of bulls finished in feedlot. Source

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