49 research outputs found

    Alterações na estrutura florística das espécies comerciais após o manejo florestal comunitário em Anapu, Pará, Brasil.

    Get PDF
    Estudos sobre florística e estrutura fitossociológica das formações florestais auxiliam a compreensão do funcionamento dos ecossistemas mediante manejo florestal. Objetivou-se, neste estudo, estimar alterações na composição, diversidade e estrutura florística de um fragmento florestal de 545,3 ha, em Anapu, Pará. Foram inventariados 9.604 indivíduos com diâmetro à altura do peito ≥50 cm, e efetivamente explorados 1.218 indivíduos com volume de 6.649,55 m³ de madeira, resultando em uma intensidade de exploração de 15,08 m³/ha. Um indicativo de que a exploração florestal foi eficiente quanto à composição florística é que se mantiveram remanescentes 87,32% do número de indivíduos das 107 espécies inventariadas antes da exploração. Dentre as famílias registradas, Fabaceae foi a que predominou antes e após a exploração. A espécie com maior número de indivíduos e índice de Valor de Cobertura foi o Acapu, enquanto no grupo das espécies exploradas foi a Timborana. A exploração alterou a ordem sequencial do Índice de Valor de Cobertura das espécies da comunidade florestal e resultou em alterações estatisticamente significativas no índice de diversidade e na estrutura da distribuição diamétrica. Por outro lado, mantiveram-se praticamente inalteradas a distribuição equitativa ?J? Pilou (de 0,803 para 0,801) e a similaridade florística superior a 93,2% na comunidade arbórea após a exploração. Conclui-se que mesmo com as boas práticas realizadas pelos assentados do Projeto de Desenvolvimento Sustentável Virola-Jatobá, em conformidade ao atual sistema policíclico de manejo florestal brasileiro, o manejo comunitário não se demonstrou sustentável ecologicamente em vista ao desequilíbrio populacional provocado pela maior pressão de exploração de um reduzido número de espécies florestai

    The kinase inhibitor SI113 induces autophagy and synergizes with quinacrine in hindering the growth of human glioblastoma multiforme cells

    Get PDF
    open15noBackground: Glioblastoma multiforme (GBM), due to its location, aggressiveness, heterogeneity and infiltrative growth, is characterized by an exceptionally dismal clinical outcome. The small molecule SI113, recently identified as a SGK1 inhibitor, has proven to be effective in restraining GBM growth in vitro and in vivo, showing also encouraging results when employed in combination with other antineoplastic drugs or radiotherapy. Our aim was to explore the pharmacological features of SI113 in GBM cells in order to elucidate the pivotal molecular pathways affected by the drug. Such knowledge would be of invaluable help in conceiving a rational offensive toward GBM. Methods: We employed GBM cell lines, either established or primary (neurospheres), and used a Reverse-Phase Protein Arrays (RPPA) platform to assess the effect of SI113 upon 114 protein factors whose post-translational modifications are associated with activation or repression of specific signal transduction cascades.Results: SI113 strongly affected the PI3K/mTOR pathway, evoking a pro-survival autophagic response in neurospheres. These results suggested the use of SI113 coupled, for maximum efficiency, with autophagy inhibitors. Indeed, the association of SI113 with an autophagy inhibitor, the antimalarial drug quinacrine, induced a strong synergistic effect in inhibiting GBM growth properties in all the cells tested, including neurospheres. Conclusions: RPPA clearly identified the molecular pathways influenced by SI113 in GBM cells, highlighting their vulnerability when the drug was administered in association with autophagy inhibitors, providing a strong molecular rationale for testing SI113 in clinical trials in associative GBM therapy.openMatteoni S.; Abbruzzese C.; Matarrese P.; De Luca G.; Mileo A.M.; Miccadei S.; Schenone S.; Musumeci F.; Haas T.L.; Sette G.; Carapella C.M.; Amato R.; Perrotti N.; Signore M.; Paggi M.G.Matteoni, S.; Abbruzzese, C.; Matarrese, P.; De Luca, G.; Mileo, A. M.; Miccadei, S.; Schenone, S.; Musumeci, F.; Haas, T. L.; Sette, G.; Carapella, C. M.; Amato, R.; Perrotti, N.; Signore, M.; Paggi, M. G

    Morphological evaluation of cardoon (Cynara cardunculus L.): assessing biodiversity for applications based on tradition, innovation and sustainability

    Get PDF
    Selected cardoon cultivars established in the “Serra da Estrela” region were analysed to evaluate morphological characteristics related principally to the production of cardoon flowers, which are a compulsory ingredient for particular Mediterranean PDO cheese regions. The biodiversity of twelve cardoon cultivars installed in an experimental field were evaluated over three growing seasons using thirty-four morphological descriptors. Statistically significant differences were found between cultivars for twenty-four morphological characteristics which indicate a wide genetic diversity. The relationship among the cultivars and characteristics was analysed using principal component analysis. A three dimensional template was found to be very significant and explained 71% of the total variation. The first component is dominated positively by plant height, diameter of stalk, inflorescence characteristics and flower production, while the second component is positively dominated by leaf characteristics. Cultivars A26, D32 and D33, present a plant architecture simultaneously well adapted for flower production, ease of harvesting and plant biomass. These characterizations and understandings can be useful for a plant breeding programme to develop cultivars for innovative potential applications besides flowers, and also for application by other cheese producers in Mediterranean regions.info:eu-repo/semantics/publishedVersio

    Introducing Protein Intrinsic Disorder.

    Get PDF

    Introducing Protein Intrinsic Disorder

    Full text link

    Spin Exchange Monitoring of the Strong Positive Homotropic Allosteric Binding of a Tetraradical by a Synthetic Receptor in Water

    Full text link
    corecore