Activity and abundance of methane-oxidizing bacteria in secondary forest and manioc plantations of Amazonian Dark Earth and their adjacent soils.

The oxidation of atmospheric CH4 in upland soils is mostly mediated by uncultivated groups of microorganisms that have been identified solely by molecular markers, such as the sequence of the pmoA gene encoding the -subunit of the particulate methane monooxygenase enzyme. The objective of this work was to compare the activity and diversity of methanotrophs in Amazonian Dark Earth soil (ADE, Hortic Anthrosol) and their adjacent non-anthropic soil

Análise discriminante do solo em Terra Preta de Índio, Iranduba/AM.

O objetivo deste trabalho foi realizar a análise discriminante do solo da TPI do campo experimental do Caldeirão-Embrapa Amazônia Ocidental no município de Iranduba-AM

Estoque de carbono em Terra Preta do Índio no Município de Iranduba-AM.

O presente trabalho objetivou estimar o estoque de carbono até um metro de profundidade em uma área de TPI de aproximadamente seis hectares

Avaliação de métodos rápidos para a quantificação de Staphylococcus aureus em alimentos.

O objetivo do trabalho foi avaliar métodos rápidos para a quantificação de S. aureus em alimentos

Localization lengths of ultrathin disordered gold and silver nanowires

The localization lengths of ultrathin disordered Au and Ag nanowires are estimated by calculating the wire conductances as functions of wire lengths. We study Ag and Au monoatomic linear chains, and thicker Ag wires with very small cross sections. For the monoatomic chains we consider two types of disorder: bounded random fluctuations of the interatomic distances, and the presence of random substitutional impurities. The effect of impurity atoms on the nanowire conductance is much stronger. Our results show that electrical transport in ultrathin disordered wires may occur in the strong localization regime, and with relatively small amounts of disorder the localization lengths may be rather small. The localization length dependence on wire thickness is investigated for Ag nanowires with different impurity concentrations.Comment: 6 pages, postscript figures included, submitted to PR

Acúmulo de carbono no solo no sistema plantio direto de milho no Amazonas.

No Estado do Amazonas poucos estudos foram realizados sobre a utilização do sistema plantio direto. Assim, o objetivo foi avaliar o efeito do sistema plantio direto sobre o acúmulo de carbono orgânico total do solo ao longo do tempo na cultura do milho

Total and monthly yields of forage oat cultivars in different locations in the South and Southeast of Brazil.

The objective of this study was to evaluate the total and monthly yield of black (Avena strigosa Schreb.) and white (Avena sativa L.) oat cultivars in South and Southeast of Brazil, in order to identify the materials with the greatest potential and better production profile for each location

Carbono da biomassa e respiração microbiana em terra preta de índio em Iranduba/AM.

O objetivo desse trabalho foi avaliar o carbono da biomassa (CBM) e respiração microbiana em terra preta de índio no município de Iranduba-AM