Estudo de retenção de carotenoides totais em híbridos de mandioca cozida.

O consumo culinário das raízes de mandioca é bastante generalizado em todo o mundo, sendo que a forma de processamento mais utilizada na América Latina e África é o cozimento. As raízes de mandioca ainda podem ser integradas a pratos mais complexos. O melhoramento e a seleção de matérias primas de origem vegetal com altos conteúdos de micronutrientes vêm sendo realizada nos países em desenvolvimento com a finalidade de minimizar carências nutricionais

Processo de Seleção Escape para Obtenção de Plantas de Pessegueiro e Ameixeira com Alta Sanidade.

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Divergência entre acessos de tucumã por caracteres da planta.

Avaliou-se a divergência entre acessos de tucumanzeiro por caracteres da planta. Para tanto onze caracteres foram avaliados em 29 acessos do BAG ? tucumã da Embrapa Amazônia Oriental. Para sete caracteres foram estimadas as distâncias euclidianas médias padronizadas e agrupadas por métodos hierárquicos e não-hierárquicos. As dissimilaridades variaram de 0,57 a 3,69, com os acessos 28 e 21 sendo os mais divergentes e os acessos 25 e 18 os menos dissimilares. A distância genética média foi de 1,35 e 45,81% dos pares obtidos tiveram distâncias iguais ou superiores à média. Os acessos de tucumanzeiro são divergentes para sete caracteres de planta, formando de seis a nove grupos distintos. Os caracteres número de espinhos na bainha foliar, comprimento de internós e número de espinhos no estipe apresentam as maiores contribuições para a divergência.PIBIC-2011

Land Use Intensification Effects on Soil C Dynamics in Subtropical Grazing Land Ecosystems

The impacts of land intensification on carbon (C) responses are important components of soil organic carbon (SOC) management. Grazing land intensification typically involves the use of highly productive plant species that can support greater grazing pressure, removal of higher proportions of site biomass and nutrients during mechanical harvest or grazing, and increased use of fertilizers, particularly N. Current improved grazing land management strategies are aimed at increasing above-ground biomass yield, with less regard for below-ground C dynamics. Because intensive management affects above- and below-ground C inputs (Schuman et al. 1999; Liu et al. 2011a,b), it can therefore have important implications on the amount and characteristics of SOC stored in grazing lands (Franzluebbers and Stuedemann, 2003; Dubeux et al. 2006; Silveira et al. 2013). The objective of this study was to investigate the long-term impacts of converting native rangeland ecosystems into intensively managed systems on SOC dynamics in subtropical ecosystems

Rural-urban migration in d-dimensional lattices

The rural-urban migration phenomenon is analyzed by using an agent-based computational model. Agents are placed on lattices which dimensions varying from d=2 up to d=7. The localization of the agents in the lattice define their social neighborhood (rural or urban) not being related to their spatial distribution. The effect of the dimension of lattice is studied by analyzing the variation of the main parameters that characterizes the migratory process. The dynamics displays strong effects even for around one million of sites, in higher dimensions (d=6, 7).Comment: 9 pages, 7 figures, to be published in International Journal of Modern Physics C 1

Salinity dependence of the distribution of multicellular magnetotactic prokaryotes in a hypersaline lagoon

Candidatus Magnetoglobus multicellularis is an unusual magnetotactic multicellular microorganism composed of a highly organized assemblage of gram-negative bacterial cells. In this work, the salinity dependence of Ca. M. multicellularis and its abundance in the hypersaline Araruama Lagoon, Brazil were studied. Viability experiments showed that Ca. M. multicellularis died in salinities >55‰ and < 40‰. Low salinities were also observed to modify the cellular assemblage. In microcosms prepared with different salinities, the microorganism grew better at intermediate salinities whereas in high or low salinities, the size of the population did not increase over time. The concentrations of Ca. M. multicellularis in the lagoon were related to salinity; sites with lower and higher salinities than the lagoon average contained less Ca. M. multicellularis. These results demonstrate the influence of salinity on the survival and distribution of Ca. M. multicellularis in the environment. In sediments, the abundance of Ca. M. multicellularis ranged from 0 to 103 microorganisms/ml, which represented 0.001% of the counts of total bacteria. The ability of Ca. M. multicellularis to accumulate iron and sulfur in high numbers of magnetosomes (up to 905 per microorganism) suggests that its impact on the sequestration of these elements (0.1% for biogenic bacterial iron) is not proportional to its abundance in the lagoon. [Int Microbiol 2009; 12(3):193-201