Efeito de indutores abióticos de resistência na severidade da ferrugem-asiática e na produtividade de soja.

Indutores de resistência sistêmica têm sido empregados com sucesso no manejo de doenças em diversos patossistemas. Essa prática, quando eficiente, contribui para o manejo sustentável da produção, resultando em redução de custos e menor impacto ambiental. Neste trabalho, os indutores de resistência silicato de potássio (solução aquosa), silicato de cálcio (volastonita) e acibenzolar-S-methyl (granulado dispersível em água) foram testados para o controle da ferrugem-asiática-da-soja, em duas safras consecutivas. Nenhum dos indutores testados apresentou eficiência no controle da doença, quando não associados à aplicação de fungicida. Aplicações preventivas de silicato de potássio permitiram redução do uso de fungicida.bitstream/item/82997/1/BP201262.pd

Bound - states for truncated Coulomb potentials

The pseudoperturbative shifted - $l$ expansion technique PSLET is generalized for states with arbitrary number of nodal zeros. Bound- states energy eigenvalues for two truncated coulombic potentials are calculated using PSLET. In contrast with shifted large-N expansion technique, PSLET results compare excellently with those from direct numerical integration.Comment: TEX file, 22 pages. To appear in J. Phys. A: Math. & Ge

Simultaneous analysis of 25 phenolic compounds in grape juice for HPLC: method validation and characterization of São Francisco Valley samples.

A HPLCmethod for simultaneous determination of 25 phenolic compounds in grape juicewas optimized, validated and applied in the characterization of juices produced in São Francisco Valley (SFV), Brazil. The performance characteristics of the method were established by assays with standard solutions of phenolic compounds, spiked and unspiked samples. Linearity,matrix effects, trueness, precision, detection and quantification limits were evaluated. Linearity was demonstrated in the concentration ranges tested for all phenolic compounds. Significant matrix effects were not identified for the studied compounds.Mean recoveries ranged from86.18 to 106.50%, demonstrating no lack of trueness. Precision of the method was confirmed for the 25 phenolic compounds, with acceptable repeatability relative standard deviations (from 0.71 to 9.24%) and within-reproducibility relative standard deviations (from1.34 to 9.26%) for unspiked and spiked samples. The theoretical limits of detection and quantification of themethod varied from 0.001 to 0.19 Mg mL-1 and 0.003 to 0.37 Mg mL-1, respectively. The results of the validation process showed that the proposed method is fitness for purpose. This method was able to identify simultaneously 25 phenolic compounds and had advantages such as low consumption of solvents and easy sample preparation. The phenolic profile of the grape juices from SFV varied according the grape cultivar. Phenolics of the anthocyanins and tannins class predominated in red grape juices, while in white grape juice phenolic acids and tannins were found at high concentrations