324,780 research outputs found
Computational models of the development of perceptual expertise
No full textIn a recent article, Palmeri, Wong and Gauthier have argued that computational models may help direct hypotheses about the development of perceptual expertise. They support their claim by an analysis of models from the object-recognition and perceptual-categorization literatures. Surprisingly, however, they do not consider any computational models from traditional research into expertise, essentially the research deriving from Chase and Simon’s chunking theory, which itself was influenced by De Groot’s study of chessplayers. This is unfortunate, as a series of computational models based on perceptual chunking have explained a substantial number of phenomena related to expert behaviour and provide mechanisms that directly address the question of perceptual expertise
Amaranthus palmeri
No full textFamily name (scientific): Amaranthaceae
Scientific name: Amaranthus palmeri
Authors names: S. Watson
Successional Allelopathic Interactions of Amaranthus palmeri S. Wats. and Cereals
No full textPlant allelochemicals can affect the germination and growth of other plant species. Petri and pot experiments were conducted to detect the interaction of Amaranthus palmeri with cereals (barley, oat, wheat, and triticale). Aqueous extracts of different tissues of A. palmeri and cereals at several concentrations were used to measure the inhibitory effects on the germination of other plants in the Petri experiments. A. palmeri plants and cereals grown at two different densities were incorporated into a potting mix at two different growing stages to determine the inhibitory effects on the germination and growth of other plants in pot experiments. The relative germination inhibition of A. palmeri was present in the following order: barley > oat > triticale > wheat. The relative germination inhibition of cereals was present in the following order: oat > triticale > barley > wheat. The above-ground parts of the plants were more effective than the roots. The germination of A. palmeri was only affected by wheat, while barley was better at reducing the dry weight in pot experiments. Wheat was found to be the only cereal affected by A. palmeri. Despite the prevailing hypothesis that these plants do not affect each other’s germination and development in nature, it was concluded that using wheat and barley as a cover crop can support A. palmeri management, and delaying wheat planting in the presence of A. palmeri can protect cereals from allelopathic interference
Dioscorea palmeri (detalle)
No full textDetalle del ejemplar de Dioscorea palmeri colectado por S. H. Bullock (1854
Amaranthus palmeri S. Watson, primeros datos para la flora valenciana
No full textAmaranthus palmeri
S. Watson (Amaranthaceae) is cited for the first time in the Valencian flora, found in the province of
Castellón (Spain), in the village of Vila-real. It is an allochthonous species of moderately recent introduction and in full expansion in the Iberian PeninsulaSe cita por primera vez en la flora valenciana Amaranthus palmeri S. Watson (Amaranthaceae), encontrada en la provincia de Castellón (España), en el municipio de Vila-real. Se trata de una
especie alóctona de introducción medianamente reciente y en plena expansión en la Península Ibéric
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