187 research outputs found
Fracionamento quĂmico da matĂ©ria orgĂąnica humificada em solo de comunidade indĂgena, Nioaque-MS.
Fracionamento quĂmico da matĂ©ria orgĂąnica humificada em solo de comunidade indĂgena, Miranda-MS.
Adaptations and responses of the common dandelion to low atmospheric pressure in highâaltitude environments
Atmospheric pressure is an important, yet understudied factor that may shape plant ecology and evolution.
By growing plants under controlled conditions at different experimental stations in the Swiss alps, we evaluated the impact of ecologically realistic atmospheric pressures between 660 and 950 hPa on the growth and defence of different dandelion populations.
Low atmospheric pressure was associated with reduced root growth and defensive sesquiterpene lactone production. Defence suppression only occurred in populations originating from lower altitudes. Populations from higher altitudes constitutively produced less sesquiterpene lactones and did not suffer from suppression under low atmospheric pressure.
Synthesis. We conclude that atmospheric pressure modulates root growth and defence traits, and that evolutionary history shapes plant phenotypic responses to atmospheric pressure. Our findings have important implications for our understanding of altitudinal gradients and the future use of plants as a source of food and bioactive metabolites in extraterrestrial habitats
Scale-free movement patterns in termites emerge from social interactions and preferential attachments
As the number or density of interacting individuals in a social group increases, a transition can develop from uncorrelated and disordered behaviour of the individuals to a collective coherent pattern. We expand this observation by exploring the fine details of termite movement patterns to demonstrate that the value of the scaling exponent ” of a power-law describing the Lévy walk of an individual is modified collectively as the density of animals in the group changes. This effect is absent when termites interact with inert obstacles. We also show that the network of encounters and interactions among specific individuals is selective resembling a preferential attachment mechanism which is important for social networking. TeOur data suggest strongly that preferential attachments, a phenomenon not reported previously, and favourite interactions with a limited number of acquaintances are responsible for the generation of Lévy movement patterns in these social insects
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Rifabutin central nervous system concentrations in a rabbit model of tuberculous meningitis.
Tuberculous meningitis (TBM) has a high mortality, possibly due to suboptimal therapy. Drug exposure data of antituberculosis agents in the central nervous system (CNS) are required to develop more effective regimens. Rifabutin is a rifamycin equivalently potent to rifampin in human pulmonary tuberculosis. Here, we show that human-equivalent doses of rifabutin achieved potentially therapeutic exposure in relevant CNS tissues in a rabbit model of TBM, supporting further evaluation in clinical trials
PrevisĂŁo probabilĂstica de enchentes para uma pequena bacia hidrogrĂĄfica do Pantanal.
O monitoramento para a previsĂŁo de cheias de pequenas bacias hidrogrĂĄficas Ă© de grande importĂąncia tendo em vista a relação dos recursos hĂdricos com a sociedade, pois pode garantir o uso sustentĂĄvel Ă s comunidades urbanas de cidades lindeiras Ă bacia. O rio Aquidauana estĂĄ inserido na planĂcie Pantaneira sendo considerado vulnerĂĄvel Ă inundaçÔes, no entanto, falta de um sistema eficiente para previsĂ”es de cheias e inundaçÔes. Assim, este estudo propĂ”e um sistema de previsĂŁo probalĂstica de enchentes para a bacia do Rio Aquidauana. Para tanto foram utilizadas as redes neurais artificiais (RNAs) do tipo MultiLayer Perceptron (treinamento backpropagation) com parĂąmetros otimizados pelos Algoritmos GenĂ©ticos. A RNA foi treinada e avaliada com base em dados de chuva acumulada (mm) e nĂvel de rio (cm) Ă montante entre os anos de 1995 a 2014. A previsĂŁo realizada foi de 1 a 5 dias, tendo como melhor desempenho o modelo para 1 dia de previsĂŁo, com resultado de coeficiente de determinação e erro quadrĂĄtico mĂ©dio de 0,93 e 30 (cm), respectivamente
Check-list das Leguminosae do estado de Mato Grosso do Sul.
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Previous issue date: 2018-08-14bitstream/item/181445/1/701-2602-1-SM.pd
The ESSnuSB design study: overview and future prospects
ESSnuSB is a design study for an experiment to measure the CP violation in
the leptonic sector at the second neutrino oscillation maximum using a neutrino
beam driven by the uniquely powerful ESS linear accelerator. The reduced impact
of systematic errors on sensitivity at the second maximum allows for a very
precise measurement of the CP violating parameter. This review describes the
fundamental advantages of measurement at the 2nd maximum, the necessary
upgrades to the ESS linac in order to produce a neutrino beam, the near and far
detector complexes, the expected physics reach of the proposed ESSnuSB
experiment, concluding with the near future developments aimed at the project
realization.Comment: 19 pages, 11 figures; Corrected minor error in alphabetical ordering
of the authors: the author list is now fully alphabetical w.r.t. author
surnames as was intended. Corrected an incorrect affiliation for two authors
per their reques
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