Pragas com potencial quarentenário para a cultura da cana-de-açúcar.

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Pragas com potencial quarentenário para culturas oleaginosas envolvidas na produção da agroenergia.

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Utilização de proteases vegetais na fabricação de queijos coalho com leite de cabra.

Na indústria alimentícia, as proteases têm encontrado diversas aplicações, algumas bastante tradicionais, a exemplo da quimosina, amplamente utilizada na fabricação de queijos. Entretanto, o aumento do consumo de queijos e a diminuição na disponibilidade de estômagos de bezerro lactentes têm ocasionado a demanda por coalhos alternativos como os de origem microbiana e animal, obtidos muitas vezes por manipulação genética. Produtos de ocorrência natural, como proteases extraídas de vegetais e destinadas à fabricação de queijos, apresentam a vantagem de serem mais facilmente aceitos pelos consumidores e aprovados para comercialização. Em estudos anteriores na Embrapa Caprinos e Ovinos, observou-se que sementes de girassol (Helianthus annus) apresentaram atividade coagulante no leite. Baseados nestes estudos realizaram-se novos experimentos com objetivo de avaliar o potencial da utilização de extratos das sementes de girassol na fabricação de queijos de leite de cabra. Para alcançar este objetivo, queijos foram fabricados com enzima tradicional (quimosina) e comparados com os fabricados com extratos de girassol, com base em eletroforeses e análises físico-químicas. Apresentando semelhança entre as características físico-químicas e eletroforéticas entre os dois processamentos, mostrando ser possível a fabricação de queijos fabricados a partir de extratos de sementes de girassol

Variabilidade de genótipos de mandioca indústria e mesa quanto a resistência de percevejo-de-renda.

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Pragas com potencial quarentenário para a cultura envolvidas na produção de biodiesel.

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Lepidoptera (Insecta) associated with soybean in Argentina, Brazil, Chile and Uruguay.

ABSTRACT:The present research updates the systematic position and nomenclature of Lepidoptera associated with soybean crops in Argentina, Brazil, Chile and Uruguay. Scientific literature lists 69 species of Lepidoptera feeding on soybean plants. These species are representatives of the Superfamilies Noctuoidea (31), Pyraloidea (13), Hesperioidea (12), Tortricoidea (5), Geometroidea (5), and Bombycoidea (3). Diversity of Lepidoptera associated to crop, injury in different parts of the plant, and changes in species composition are discussed considering the changes in plant disease management, introduction of plants expressing Bt proteins, and the recent introduction of Helicoverpa armigera (Hübner) as a new crop pest. RESUMO: The present research updates the systematic position and nomenclature of Lepidoptera associated with soybean crops in Argentina, Brazil, Chile and Uruguay. Scientific literature lists 69 species of Lepidoptera feeding on soybean plants. These species are representatives of the Superfamilies Noctuoidea (31), Pyraloidea (13), Hesperioidea (12), Tortricoidea (5), Geometroidea (5), and Bombycoidea (3). Diversity of Lepidoptera associated to crop, injury in different parts of the plant, and changes in species composition are discussed considering the changes in plant disease management, introduction of plants expressing Bt proteins, and the recent introduction of Helicoverpa armigera (Hübner) as a new crop pest

Synthesis of 7-Chloroquinoline Derivatives Using Mixed Lithium-Magnesium Reagents

We have prepared a library of functionalized quinolines through the magnesiation of 7-chloroquinolines under mild conditions, employing both batch and continuous flow conditions. The preparation involved the generation of mixed lithium-magnesium intermediates, which were reacted with different electrophiles. Mixed lithium-zinc reagents allowed the synthesis of halogenated and arylated derivatives. Some of the synthesized 4-carbinol quinolines have shown interesting antiproliferative properties, their hydroxyl group being a suitable amino group bioisostere. We also report a two-step approach for optically active derivatives

Measurement and Interpretation of Fermion-Pair Production at LEP energies above the Z Resonance

This paper presents DELPHI measurements and interpretations of cross-sections, forward-backward asymmetries, and angular distributions, for the e+e- -> ffbar process for centre-of-mass energies above the Z resonance, from sqrt(s) ~ 130 - 207 GeV at the LEP collider. The measurements are consistent with the predictions of the Standard Model and are used to study a variety of models including the S-Matrix ansatz for e+e- -> ffbar scattering and several models which include physics beyond the Standard Model: the exchange of Z' bosons, contact interactions between fermions, the exchange of gravitons in large extra dimensions and the exchange of sneutrino in R-parity violating supersymmetry.Comment: 79 pages, 16 figures, Accepted by Eur. Phys. J.

Study of Leading Hadrons in Gluon and Quark Fragmentation

The study of quark jets in e+e- reactions at LEP has demonstrated that the hadronisation process is reproduced well by the Lund string model. However, our understanding of gluon fragmentation is less complete. In this study enriched quark and gluon jet samples of different purities are selected in three-jet events from hadronic decays of the Z collected by the DELPHI experiment in the LEP runs during 1994 and 1995. The leading systems of the two kinds of jets are defined by requiring a rapidity gap and their sum of charges is studied. An excess of leading systems with total charge zero is found for gluon jets in all cases, when compared to Monte Carlo Simulations with JETSET (with and without Bose-Einstein correlations included) and ARIADNE. The corresponding leading systems of quark jets do not exhibit such an excess. The influence of the gap size and of the gluon purity on the effect is studied and a concentration of the excess of neutral leading systems at low invariant masses (<~ 2 GeV/c^2) is observed, indicating that gluon jets might have an additional hitherto undetected fragmentation mode via a two-gluon system. This could be an indication of a possible production of gluonic states as predicted by QCD.Comment: 19 pages, 6 figures, Accepted by Phys. Lett.