Influência da incidência de luz na germinação e vigor de sementes de nó-de-cachorro.

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Organogênese in vitro de videira.

O objetivo do presente trabalho foi avaliar o efeito da N6-benzilaminopurina (BAP) no processo de regeneração via organogênese in vitro,em sete cultivares de videira

Semiclassical Evolution of Dissipative Markovian Systems

A semiclassical approximation for an evolving density operator, driven by a "closed" hamiltonian operator and "open" markovian Lindblad operators, is obtained. The theory is based on the chord function, i.e. the Fourier transform of the Wigner function. It reduces to an exact solution of the Lindblad master equation if the hamiltonian operator is a quadratic function and the Lindblad operators are linear functions of positions and momenta. Initially, the semiclassical formulae for the case of hermitian Lindblad operators are reinterpreted in terms of a (real) double phase space, generated by an appropriate classical double Hamiltonian. An extra "open" term is added to the double Hamiltonian by the non-hermitian part of the Lindblad operators in the general case of dissipative markovian evolution. The particular case of generic hamiltonian operators, but linear dissipative Lindblad operators, is studied in more detail. A Liouville-type equivariance still holds for the corresponding classical evolution in double phase, but the centre subspace, which supports the Wigner function, is compressed, along with expansion of its conjugate subspace, which supports the chord function. Decoherence narrows the relevant region of double phase space to the neighborhood of a caustic for both the Wigner function and the chord function. This difficulty is avoided by a propagator in a mixed representation, so that a further "small-chord" approximation leads to a simple generalization of the quadratic theory for evolving Wigner functions.Comment: 33 pages - accepted to J. Phys.

Desenvolvimento de estacas de Alfavaca (Ocimum gratissimum L.) em direfentes substratos.

O objetivo deste estudo foi avaliar o efeito de diferentes proporções de areia, terra e composto orgânico no crescimento de raízes e parte aérea de estacas de alfavaca, de modo a identificar o substrato que proporciona as melhores condições de pegamento das estacas e desenvolvimento das mudas.bitstream/CPAP-2010/57271/1/COT75.pd