Research Notes: Resistance of soybean lines and cultivars to the root-knot nematode, Meloidogyne javanica

In a clayed soil heavy infested with Meloidogyne javanica at Guatapara farm , state of Sao Paulo , 36 soybean cultivars and breeding lines were tested for resistance to this nematode. Plots were constituted of three rows, 3 m long and 0.60 m apart and each plot was bordered on both sides with a row of \u27Davis \u27 cv, the susceptible check. Soybeans were seeded in November, 1979, in a randomized complete block design with eight replications

Supercurrent tunneling between conventional and unconventional superconductors: A Ginzburg-Landau approach

We investigate the Josephson tunneling between a conventional and an unconventional superconductor via a Ginzburg-Landau theory. This approach allows us to write down the general form of the Josephson coupling between the two superconductors, and to see which terms are forbidden or allowed by spatial symmetries. The time-reversal symmetry is also considered. We discuss the current-phase relationships, magnetic, and ac effects if we just include this direct coupling to the unconventional superconductor. In addition we consider the Josephson coupling between two short-coherence-length superconductors, extending the work of Deutscher and Müller (DM) to a finite-current calculation. We find that the critical current is suppressed below the DM value due to the fact that the coupling between the two superconductors across the junction depends on the phase difference and hence the current itself. Finally we investigate the possibility of the proximity effect, in particular the possibility that the conventional-type pairing is induced and hence coexists with the unconventional pairing near the junction. This would give the dominant contribution to the tunneling current if the direct tunneling to the unconventional pairs are suppressed for some reason. We point out that there is no possibility of dissipationless tunneling above the transition temperature of the unconventional superconductor. Even in the case in which the unconventional superconductor is below its transition temperature, we find that, for the possibility of a dissipationless current, it is crucial to have a coupling between the induced s wave and the unconventional superconductor that depends on their phase difference, which allows the conversion of the supercurrent from one type to the other. The behavior of this current, in particular as a function of temperature, is discussed. We also discuss the magnetic and time-dependent effects of the junction in the presence of this proximity effect. We see that, while some of these remain unaffected, some, in particular the time-dependent processes, are affected in a rather nontrivial manner

Comparação entre extratores químicos de fósforo disponível.

Foram comparados três extratos quimicos de fósforo dispon¡vel em um Latossolo Vermelho-Escuro submetido a quatro tratamentos de adubação fosfatada (0, 150 e 450 mg de P/dm3 de solo). Os extratores qu¡micos testados foram: Mehlich 1, Mehlich 3 e resina trocadora de ânions. Entre esses, sobressaiu-se a resina, com maiores coeficientes de correlação entre a matéria seca da parte aérea de plantas de milho e o fósforo acumulado no tecido vegetal e com o fósforo extra¡do do solo. A resina também recuperou maior quantidade de fósforo do solo, além de ter apresentado correlação significativa com os outros extratores.bitstream/item/35785/1/Bol18.pd

Demandas do agronegócio maranhense.

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Mecanismos bioquímicos, fisiológicos e moleculares relacionados com a eficiência de uso de nitrogênio em leguminosas e gramíneas.

Absorção do nitrogênio pelas plantas; Assimilação do nitrogênio pelas plantas; Ação das enzimas na eficiência de uso do nitrogênio; Identificação de genes relacionados à eficiência de uso do nitrogênio; Genes envolvidos na absorção do nitrato; Genes envolvidos na absorção do amônio; Estudos genéticos da eficiência de uso do nitrogênio; Variação da eficiência de uso de nitrogênio em gramíneas e leguminosas.bitstream/CPAMN-2010/24172/1/doc195.pd

Asymptotic localization of symbol correspondences for spin systems and sequential quantizations of S2S^2

Quantum or classical mechanical systems symmetric under $SU(2)$ are called spin systems. A $SU(2)$-equivariant map from $(n+1)$-square matrices to functions on the $2$-sphere, satisfying some basic properties, is called a spin-$j$ symbol correspondence ($n=2j\in\mathbb N$). Given a spin-$j$ symbol correspondence, the matrix algebra induces a twisted $j$-algebra of symbols. In this paper, we establish a new, more intuitive criterion for when the Poisson algebra of smooth functions on the $2$-sphere emerges asymptotically ($n\to\infty$) from the sequence of twisted $j$-algebras. This more geometric criterion, which in many cases is equivalent to the numerical criterion obtained in [Rios&Straume], is given in terms of a classical (asymptotic) localization of symbols of all projectors (quantum pure states) in a certain family. For some important kinds of symbol correspondence sequences, such a classical localization condition is equivalent to asymptotic emergence of the Poisson algebra. But in general, this classical localization condition is stronger than Poisson emergence. We thus also consider some weaker notions of asymptotic localization of projector-symbols. Finally, we obtain some relations between asymptotic localization of a symbol correspondence sequence and its sequential quantizations of the classical spin system, after carefully developing a theory of sequential quantizations of smooth functions on $S^2$ and their asymptotic actions on a ground Hilbert space.Comment: slight edition of expanded version, 56 page

Agricultura apoiada pela comunidade: poderia a experiência dos agricultores americanos ser útil para os agricultores urbanos brasileiros?

O objetivo deste trabalho foi obter algumas informações sobre o projeto Agricultura Apoiada pela Comunidade (AAC) nos EUA e avaliar se consumidores e produtores urbanos pobres de uma cidade brasileira de baixa renda aceitariam se engaja neste tipo de projeto

Chemical changes and heavy metal partitioning in an oxisol cultivated with maize (Zea mays, L.) after 5 years disposal of a domestic and an industrial sewage sludge.

The need for solutions to minimize the negative environmental impacts of anthropogenic activities Fhas increased. Sewage sludge is composed of predominantly organic matter and can be used to improve soil characteristics, such as fertility. Therefore, its application in agriculture is an adequate alternative for its final disposal. However, there is a lack of information on its long-term effects on soil changes in tropical areas. Thus, the objectives of this study were to determine (i) the effect of sewage sludge application on heavy metal build-up in soil and maize grains and leaves, and (ii) the effects of soil amendment with sewage sludge on the chemical properties of a Brazilian oxisol. Besides the increasing levels of Zn, Cu, Ni, and Cr, amending soil with sewage sludge also alters the distribution of these metals by increasing the mobile Phases, which correlated significantly with the increase in metal extraction with two single extractants, Mehlich 1 and DTPA (Diethylene triamine pentaacetic acid). The levels of Fe, Mn, Zn, and Cu in maize grains and leaves increased with the type and rate of sewage sludge application. Nevertheless, metal build-up in soil and plants was within the allowed limits. Significant differences were also found in soil characteristics like humic fractionation with the applied sewage doses. The data obtained does not indicate any expressive drawbacks in the use of sewage sludge as a soil amendment, as the heavy metal concentrations observed are unlikely to cause any environmental or health problems, even overestimated loadings, and are in accordance with the Brazilian regulations on farming land biosolid disposal

Fertilidade do solo manejado em sistema de integração lavoura-pecuária-floresta na transição Cerrado-Amazônia.

Este trabalho teve por objetivo avaliar a variabilidade da fertilidade do solo em ILPF, com uma linha de árvores de Eucaliptus urograndis por renque, em função da distância da linha de árvores, em quatro profundidades.Apresentação oral - Pós-graduação