We show that the difference of adiabatic phases, that are basis-dependent, in noncyclic evolution of non-degenerate quantum systems have to be taken into account to give the correct interference result in the calculation of physical quantities in states that are a superposition of instantaneous eigenstates of energy. To verify the contribution of those adiabatic phases in the interference phenomena, we consider...
We study the adiabatic evolution of a two-level model in the presence of an external classical electric field. The coupling between the quantum model and the classical field is taken in the electric dipole approximation. In this regime, we show the absence of geometric phases in the interacting two-level model in the presence of any periodic real time-dependent classical electric field. We obtain a conservative...
The cytotoxic activity of amino (3a-e), aza-1-antraquinone (4a-e) lapachol derivatives against Ehrlich carcinoma and human K562 leukemia cells was investigated. Cell viability was determined using MTT assay, after 48 (Ehrlich) or 96 h (K562) of culture, and vincristine (for K562 leukemia) and quercetin (for Ehrlich carcinoma) were used as positive controls. The results showed dose-dependent growth-inhibiting ac...
2006
2006
RESUMO: A eliminação de microrganismos é uma condição essencial para o estabelecimento de um processo de regeneração in vitro, pois eles além de competirem pelos nutrientes também produzem toxinas que causam a morte do explante. O trabalho visou desenvolver metodologias de controle de crescimento de microrganismos provenientes de explantes de mangueira inoculados em meio de cultura, como fase inicial do estabel...
ABSTRACT: Mango (Mangifera indica L.) is one of the most important tropical fruits cultivated in Brazil with area higer than 70 thousand hectares, production of 970 thousand tones. However, it was exported only 13,4% of this production, which is equivalent to 130 thousand tones, in 2003. Mango production and exportation are mostly developed at tropical Semi-arid condition in Northeast Brazil, which concentrated...
Carpotroche brasiliensis is a native Brazilian tree belonging to the Oncobeae tribe of Flacourtiaceae. The oil extracted from its seeds contains as major constituents the same cyclopentenyl fatty acids hydnocarpic (40.5%), chaulmoogric (14.0%) and gorlic (16.1%) acids found in the better known chaulmoogra oil prepared from the seeds of various species of Hydnocarpus (Flacourtiaceae). These acids are known to be...
RESUMO: A manga (Mangifera indica L. ) é uma das mais importantes frutas tropicais cultivada no Brasil com área de 70 mil hectares e produção equivalente a 970 mil toneladas. No entanto, a exportação de frutas frescas representou apenas 13,4% da produção, equivalente a 130 mil toneladas, em 2003. A área de produção para exportação está quase totalmente instalada no Nordeste brasileiro e 80% está concentrada na ...
2004
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