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Rio Branco, Brazil

Chibui bari is an edaphic oligochaeta from the Amazon region, called "minhocuçu" in view of its large size (length up to 60 cm). Their castings, in tower-shaped mounds with a height of up to 30 cm and dry weight of 2 kg, are common on the soil surface of Acre State. The objective of this study was to compare nutrient availability, organic carbon concentration and microbial activity in Chibui bari castings with soil of the surroundings under secondary forest, rubber cultivation and pasture, in areas of the Federal University of Acre - UFAC in Rio Branco, Acre. The experiment was arranged in a randomized block design, with three treatments consisting of a) Chibui bari castings and soil samples from within a radius of 10 cm from each casting from depths of b) 0-10 cm and c) 10-20 cm. The results were submitted to analysis of variance and treatment means compared by the Tukey test at 5 % probability. In addition, the simple correlation between the variables was analyzed. The pH values, available P, exchangeable cations (Ca2+, Mg2+, K+), organic carbon and microbial activity were higher in the castings than in the surrounding soil, whereas the Al3+ concentration was lower in castings in the 0- 20 cm layer by 55 % (pasture), 62 % (rubber cultivation) and 70 % (forest). There was also a positive correlation of soil organic carbon values with pH, P, K+, Ca2+ and Mg2+ and negative correlations of Al3+ with soil organic carbon, pH, K+, Ca2+ and Mg2+ in the three areas. Source

Objective: To assess the prevalence and factors associated with excess weight among high school students. Methods: Cross-sectional study with 741 adolescents from private schools in Rio Branco, Acre, Northern Brazil. The weight and height were prospectively measured in order to calculate the body mass index. Overweight was defined according to World Health Organization references in 2007. The following variables were collected: gender, age, socioeconomic status, parental education, number of household members and siblings, physical activity, time watching TV and computer time. Factors associated with excess weight were identified by multiple Poisson regression using the backward elimination procedure for variable selection. Results: The prevalence of overweight was 29.5%. Males showed righer prevalence (33.2%) compared with females (26.4%). As for age, the prevalence was higher at 14 years (40%) in both genders. In the multivariate analysis, adjusted for age and gender, more than two hours in the computer per day and a sedentary lifestyle were associated with excess weight. Conclusions: Excess weight is a serious public health problem in high school students from private institutions of an urban area of the Amazonia Region. The promotion of physical activity and the reduction of time in the computer should be considered as strategies to improve the health of adolescents. Source

Soares A.A.,Federal University of Lavras | de Sousa Reis M.S.,Epamig | de Oliveira Cornelio V.M.,Epamig | Leite N.A.,Federal University of Vicosa | And 4 more authors.
Crop Breeding and Applied Biotechnology | Year: 2013

The basic objective of the upland rice breeding program developed in the state of Minas Gerais is to make new commercial cultivars available. A new cultivar named BRSMG Caçula is being released, with the main traits: earliness, lodging tolerance, grain quality, disease tolerance, and high grain yield. Source

Delgado R.C.,Federal Rural University of Rio de Janeiro | de Souza L.P.,UFAC
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2014

The aim of this study was to report physical characterization of the hydrographical basins of Igarapé Canela Fina and Igarapé Preto, both located in the municipality of Cruzeiro do Sul, Acre, Brazil. The ISODATA algorithm was used for the non-supervised classification, drawing on data provided by the TM Landsat 5 sensor from the National Institute for Space Research. The covered period of analysis was from 2005 to 2010. The analysis shows an average increase of 48.11% of deforested areas and a mean reduction of 50.58% in the forested areas for both basins, due to anthropic interventions over those five years. The analysis of physical characteristics shows similarities between the hydrographical basins, with both responding slowly to hydrological events, and thus providing conditions not favourable to flooding. Modifications conducted on the surface of the hydrographical basins along the last few years have, however, possibly altered the hydro dynamics of the rivers and streams. The preliminary results indicate that the Remote Sensing and Geographic Information Systems are efficient tools for the analysis of the space-time dynamics of vegetation and the morphometric characterization of hydrographical basins. Source

de Oliveira J.D.,Federal University of Acre | Dapont E.C.,Federal University of Acre | de Souza L.M.S.,UFAC | Ribeiro S.A.L.,Laboratorio Of Fitopatologia
Bioscience Journal | Year: 2012

Seeds are essential components for vegetal propagation and, in this way, seed sanitary quality assumes fundamental importance. The aim was to compare the blotter test and BDA methods to incubate seeds to evaluate sanitary quality, the influence of seed disinfection on sanitary test, emergence and seedling development of Schizolobium amazonicum. For determination of microrganisms associated with seeds were tested the methods of paper filter (blotter test) and medium Potato Dextrose Agar (PDA), with aseptic and non-aseptic seeds. The influence of asepsi were evaluated trough seedling emergence test, speed of seedling emergence and seedling development (length, fresh matter and dry matter of root and shoot). Aspergillus flavus, A. niger, Penicillium griseofulvum, Penicillium sp. and Pestalotiopsis sp. can be associated with parica seeds; PDA method is the most suitable to fungi development on this seeds specie; surface sterilization of seeds reduce microrganisms, assist the sanitary test, not affect seed germination and seedling development, but can be benefic to seedling establishment. Source

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