Asymmetry sum rule for molecular predissociation

© 2000 American Physical SocietyIn the case of weak diatomic molecular predissociation by noninteracting, optically inactive continuum states, it is demonstrated that the predissociation line shape is more accurately represented by a Beutler-Fano profile than by a Lorentzian. The weak asymmetry that is found to occur is due principally to interactions with neighboring vibrational resonances. For this type of predissociation in the case of multiple continua, a sum rule for the corresponding line-shape asymmetry is derived. This sum rule is verified numerically using single-channel and multichannel coupled Schrödinger-equation calculations for the Schumann-Runge band system of O2. Similar results are presented for the case of optically active continua.F. T. Hawes, L. W. Torop, B. R. Lewis and S. T. Gibso

The asymptotic iteration method for the angular spheroidal eigenvalues with arbitrary complex size parameter c

The asymptotic iteration method is applied, to calculate the angular spheroidal eigenvalues $\lambda^{m}_{\ell}(c)$ with arbitrary complex size parameter $c$. It is shown that, the obtained numerical results of $\lambda^{m}_{\ell}(c)$ are all in excellent agreement with the available published data over the full range of parameter values $\ell$, $m$, and $c$. Some representative values of $\lambda^{m}_{\ell}(c)$ for large real $c$ are also given.Comment: 15 pages, 1 figur

Yield, quality and conservation of heterozygous tomatoes in alcobaça, nonripening and ripening inhibitor loci

O objetivo deste trabalho foi avaliar os atributos de produtividade, qualidade e conservação pós-colheita de tomates, para comparar os efeitos promovidos pelos alelos alcobaça (norA), nonripening (nor) e ripening inhibitor (rin) em heterozigose, isoladamente ou em duplas combinações, sobre frutos de tomateiros híbridos. Foram avaliados dez tratamentos: sete híbridos experimentais quase-isogênicos, com background FloraDade x Tropic de genótipos nor+/norA, rin+/rin, nor+/nor, nor/norA, nor+/norA rin+/rin e nor+/nor rin+/rin; e três testemunhas comerciais (Floradade, Tropic e Carmen F1). Contrariamente aos genótipos rin+/rin e nor+/nor, o genótipo nor+/norA não prolongou, significativamente, a firmeza dos frutos em pós-colheita. Os genótipos duplo-mutantes norA/nor, nor+/norA rin+/rin e nor+/nor rin+/rin foram eficientes em atrasar a perda de firmeza e a evolução da coloração dos frutos; os efeitos dos locos nor+/norA e rin+/rin, juntos, sofreram desvios significativos em relação à soma dos efeitos desses locos, quando atuaram separadamente, no sentido de intensificarem esses atrasos. O uso de híbridos heterozigotos, nas duplas combinações entre os locos norA, nor e rin, mostrou-se vantajoso por propiciar frutos firmes, com maior extensão da vida pós-colheita, em comparação com o uso dos híbridos portadores desses locos isoladamente. A qualidade dos frutos duplo-mutantes não foi limitada pelo atraso na evolução da coloração vermelha.Thie objective of this work was to evaluate yield, quality and postharvest conservation of tomatoes, to compare the effects promoted by the alcobaça (norA), nonripening (nor) and ripening inhibitor (rin) alleles, in heterozygosis, singly or in double combinations on hybrid tomato fruits. Ten treatments were evaluated: seven experimental nearly isogenic hybrids of FloraDade x Tropic background or reciprocal with nor+/norA, rin+/rin, nor+/nor, nor/norA, nor+/norA rin+/rin and nor+/nor rin+/rin genotypes, and three commercial checks (FloraDade, Tropic and Carmen F1). Oppositely to the genotypes rin+/rin and nor+/nor, the genotype nor+/norA did not significantly extend the firmness of the fruits in postharvest. The double mutant genotypes norA/nor, nor+/norA rin+/rin and nor+/nor rin+/rin were efficient in delaying firmness loss and the evolution of fruits colouring; the effects of loci nor+/norA and rin+/rin, together, underwent significant deviations relatively to the sum of these loci effects, when acting singly, in the sense of enhancing those delays. Use of heterozygous hybrids in the double combinations among loci norA, nor and rin proved advantageous for providing firm fruits with a longer postharvest lifetime, as compared with the hybrids carrying these loci singly. The quality of double mutant fruits was not restricted by the delay in the evolution of red coloration

Laser-induced fluorescence imaging in a 100 kw natural-gas flame

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