A coleção de culturas de microrganismos fitopatogênicos: importante fonte de informação para a pesquisa do feijoeiro comum.

O objetivo deste trabalho foi agrupar os diversos dados relativos à coleção de culturas de microrganismos patogênicos ao feijão da Embrapa Arroz e Feijão, visando ressaltar sua complexidade e importância para o desenvolvimento de plantas resistentes a doenças.CONAFE

Are internally observable vehicle data good predictors of vehicle emissions?

Scientific research has demonstrated that on-road exhaust emissions in diesel passenger vehicles (DPV) exceeds the official laboratory-test values. Increasing concern about the quantification of magnitude for these differences has meant an increasing use of Portable Emissions Monitoring System (PEMS), but the direct use of Internally Observable Variables (IOVs) can be useful to predict emissions. The motivation for this paper is to develop an empirical approach that integrates second-by-second vehicle activity and emission rates for DPV. The objectives of this research are two-fold: (1) to assess the effect of variation in acceleration-based parameters, vehicle specific power (VSP) and IOVs on carbon dioxide (CO2) and nitrogen oxides (NOx) emission rates; and (2) to examine the correlation between IOV-based predictors of engine load and VSP. Field measurements were collected from four DPV (two small, one medium and one multi-purpose) in urban, rural and highway routes using PEMS, Global Positioning System (GPS) receivers and On-board Diagnostic (OBD) scan tool, to measure real-world exhaust emissions and engine activity data. Results suggest the relative positive acceleration (RPA) and mean positive acceleration (MPA) allowed a good differentiation with respect to route trips. IOVs models based on the product of manifold absolute pressure (MAP) and engine revolutions per minute (RPM), and VSP showed to be good predictors of emission rates. Although the CO2 correlation was found to be good (R2 > 0.8), the models for NOx showed mixed results since some vehicles showed a reasonable correlation (R2 ~ 0.7) while others resulted in worst model predictions (R2 < 0.6). IOVs models have potential to be integrated into vehicle engine units and connected vehicles, for instance, to provide real-time information on emissions rates, but other parameters regarding the thermal management on after treatment system must be included in NOx prediction. This would allow for a better understanding of true physics behind NOx emissions in DPV.publishe

Avaliação e seleção de progênies de cupuaçuzeiro (Theobroma grandiflorum), em Belém, Pará.

Este trabalho teve por objetivo a seleção entre e dentro de progênies de irmãos completos de cupuaçuzeiro. Foram avaliadas 21 progênies de irmãos completos, em dois experimentos, com cinco plantas por parcela. Os experimentos foram avaliados ao nível de indivíduos, em cada safra, para os caracteres: produção de frutos, polpa e semente, bem como resistência à vassoura-de-bruxa. Para efeito de seleção, também foi considerado o grau de parentesco das matrizes. As análises foram conduzidas via metodologia de modelos lineares mistos, como delineamento em blocos incompletos, desbalanceados com tratamentos comuns. Foram estimados os parâmetros genéticos e os valores genotípicos ajustados de progênies, bem como os valores genéticos aditivos e genotípicos individuais. Os resultados demonstraram que as progênies 12; 13; 18; 20; 21 e 24 tiveram os melhores desempenhos para as variáveis de produção. Entre elas, as pro- gênies 12; 13 e 18 foram as que mais se destacaram. Foram selecionadas três matrizes da progênie 18, duas matrizes da progênie 12 e uma matriz de cada uma das progênies 13; 20 e 21. É possível concluir que essas matrizes, juntamente com materiais selecionados em outras áreas experimentais, apresentam potencial para compor um pomar de sementes clonais, estabelecido em lote isolado de outros plantios, onde será produzida uma população melhorada de primeiro ciclo que se constituirá na nova cultivar de cupuaçuzeiro

How Do Brazilian Street Youth Experience ‘The Street’?: Analysis Of A Sentence Completion Task

This study investigated how homeless Brazilian youth experience the street and examined factors linked to positive and negative feelings about the street. An opportunity sample of 35 boys and 34 girls aged 10–18 completed a structured interview and sentence completion task aimed at eliciting open-ended responses in a standardized manner. Analyses revealed great diversity in youths’ views of the street; moreover, in analyses controlling for age and gender, youth reporting feeling positive on the street differed from those who felt negative in reasons for leaving home, family situation and daily survival. The findings support the value of the sentence completion task in exploring the subjective experiences of street youth