163 research outputs found

    Diagnóstico do estado nutricional de seringais da região da Zona da Mata de Minas Gerais.

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    Este trabalho foi realizado com o objetivo de elaborar um diagnóstico do estado nutricional de seringais na região da Zona da Mata de Minas Gerais e, a partir desse resultado, contribuir com um programa racional de adubação.bitstream/CNPS/11601/1/circtec14_2003.pd

    Transthyretin Promotes Axon Growth via Regulation of Microtubule Dynamics and Tubulin Acetylation

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    Transthyretin (TTR), a plasma and cerebrospinal fluid protein, increases axon growth and organelle transport in sensory neurons. While neurons extend their axons, the microtubule (MT) cytoskeleton is crucial for the segregation of functional compartments and axonal outgrowth. Herein, we investigated whether TTR promotes axon elongation by modulating MT dynamics. We found that TTR KO mice have an intrinsic increase in dynamic MTs and reduced levels of acetylated α-tubulin in peripheral axons. In addition, they failed to modulate MT dynamics in response to sciatic nerve injury, leading to decreased regenerative capacity. Importantly, restoring acetylated α-tubulin levels of TTR KO dorsal root ganglia (DRG) neurons using an HDAC6 inhibitor is sufficient to completely revert defective MT dynamics and neurite outgrowth. In summary, our results reveal a new role for TTR in the modulation of MT dynamics by regulating α-tubulin acetylation via modulation of the acetylase ATAT1, and suggest that this activity underlies TTR neuritogenic function

    Independence in CLP Languages

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    Studying independence of goals has proven very useful in the context of logic programming. In particular, it has provided a formal basis for powerful automatic parallelization tools, since independence ensures that two goals may be evaluated in parallel while preserving correctness and eciency. We extend the concept of independence to constraint logic programs (CLP) and prove that it also ensures the correctness and eciency of the parallel evaluation of independent goals. Independence for CLP languages is more complex than for logic programming as search space preservation is necessary but no longer sucient for ensuring correctness and eciency. Two additional issues arise. The rst is that the cost of constraint solving may depend upon the order constraints are encountered. The second is the need to handle dynamic scheduling. We clarify these issues by proposing various types of search independence and constraint solver independence, and show how they can be combined to allow dierent optimizations, from parallelism to intelligent backtracking. Sucient conditions for independence which can be evaluated \a priori" at run-time are also proposed. Our study also yields new insights into independence in logic programming languages. In particular, we show that search space preservation is not only a sucient but also a necessary condition for ensuring correctness and eciency of parallel execution

    Bancos de germoplasma de café no Brasil: base do melhoramento para produtividade e qualidade.

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    O melhoramento genético do café visa o desenvolvimento de cultivares que atendam as novas exigências do mercado consumidor. Isto é alcançado com a introdução de novas características mediante hibridações dentro ou entre espécies, aumentando, assim, a variabilidade genética do material a ser trabalhado. A utilização de materiais genéticos com características agronômicas desejáveis, tais como resistência a pragas e doenças, tolerância a seca, solos pobres em nutrientes, a baixos/altos teores de compostos químicos e melhor qualidade de bebida, entre outras, é de fundamental importância para o sucesso do agronegócio café. Este fato ressalta a grande importância da preservação dos acessos nos bancos de germoplasma, a fim de evitar a perda desses genes valiosos

    Bancos de germoplasma de café no Brasil.

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    bitstream/CENARGEN/29739/1/doc243.pd

    Adubos e corretivos.

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    O solo, mesmo quando detentor de adequada fertilidade natural, tende a apresentar, após cultivos sucessivos, diminuição em sua capacidade de fornecimento de nutrientes e de elementos benéficos em quantidade necessária para a manutenção dos níveis de produtividade das lavouras. Para que não ocorra uma redução da disponibilidade de nutrientes no solo, devem ser adotadas medidas para a correção, a manutenção ou o aumento da sua fertilidade, pois a atividade agrícola é exportadora de nutrientes. Essas medidas são realizadas pela aplicação de corretivos e adubos orgânicos e/ou minerais no solo e de adoção de práticas de manejo que preserve as características físicas, químicas e biológicas do solo, pois somente assim pode-se manter a fertilidade do solo entendida em sentido mais amplo

    Application of Chinese Jun-Cao technique for the production of Brazilian Ganoderma lucidum strains

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    Ganoderma lucidum is a medicinal mushroom traditionally used in China against a wide range of diseases such as cancer and also for its prevention. In this work, commercial Chinese strains G. lucidum were compared to wild Brazilian strains aiming to determine the cultivation potential through the use of Jun-Cao. Six formulations were tested and the strains presented good response to the applied method. In general, the mixture between the grass and wood was well suited for the basidiomycetes, contributing to the preparation of substrates that generated better results in Jun Cao
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