Browsing by Author "Vidal, R"

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    A real time visual sensor for supervision of flotation cells
    (PERGAMON-ELSEVIER SCIENCE LTD, 1998) Cipriano, A; Guarini, M; Vidal, R; Soto, A; Sepulveda, C; Mery, D; Briseno, H
    This paper describes an expert system for the supervision of flotation plants based on ACEFLOT, a real time analyzer of the characteristics of the froth that is formed on.:the surface of flotation cells. The ACEFLOT analyzer is based on image processing and measures several physical variables of the froth, including colorimetric, geometric and dynamic information. On the other hand, the expert system detects abnormal operation states and suggests corrective actions, supporting operators on the supervision and control of the flotation plant. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.
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    Enhanced DNA extraction and PCR amplification of SSU ribosomal genes from crustose coralline algae
    (2002) Vidal, R; Meneses, I; Smith, M
    As crustose Corallinales on the coasts of Chile are usually flat, thin, strongly adherent to the rocks and with a high concentration of polysaccharides, there is a need to improve DNA extraction for molecular studies. The paper describes a protocol to achieve this, which includes steps for disruption of cell walls and precipitation of polysaccharides and proteins; this leads to a PCR-quality product. The DNA obtained permitted amplification of SSU and rbcL genes from small amounts of material (< 1 g) of several genera and species of Corallinales. Comparison of the sequences of small SSU fragments (approximately 500 bp), combined with morphological characters, together provide sufficient resolution to distinguish organisms at the genus and species levels.
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    Tracking of points in a calibrated and noisy image sequence
    (2004) Mery Quiroz, Domingo Arturo; Ochoa, F; Vidal, R; Campilho, A; Kamel, M