1,401 research outputs found

    Influência do parcelamento de diferentes fontes de nitrogênio no teor de proteína em milho QPM e normal.

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    Some thoughts about nonequilibrium temperature

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    The main objective of this paper is to show that, within the present framework of the kinetic theoretical approach to irreversible thermodynamics, there is no evidence that provides a basis to modify the ordinary Fourier equation relating the heat flux in a non-equilibrium steady state to the gradient of the local equilibrium temperature. This fact is supported, among other arguments, through the kinetic foundations of generalized hydrodynamics. Some attempts have been recently proposed asserting that, in the presence of non-linearities of the state variables, such a temperature should be replaced by the non-equilibrium temperature as defined in Extended Irreversible Thermodynamics. In the approximations used for such a temperature there is so far no evidence that sustains this proposal.Comment: 13 pages, TeX, no figures, to appear in Mol. Phy

    The morita-baylis-hillman reaction: advances and contributions from brazilian chemistry

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    The Morita-Baylis-Hillman reaction is an organocatalyzed chemical transformation that allows access to small poly-functionalized molecules and has considerable synthetic potential and promising biological profiles. In this review, we report the efforts made by Brazilian research groups in recent years on the development of Morita-Baylis-Hillman chemistry. The review covers these contributions, with a focus on mechanistic studies, improvement of the experimental conditions, and the use of Morita-Baylis-Hillman adducts as building blocks for the synthesis of heterocycles, natural products and drugs126830852CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQFUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESPsem informação2013/10449-5; 2013/07600-5; 2012/08048-
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