Papers by Hugo Percy Sierra Goldberg
Proyecto financiado por Fondo de Protección Ambiental Ministerio del Medio Ambiente
Vine phenology, like many other cultivated species, is highly determined by temperature and solar... more Vine phenology, like many other cultivated species, is highly determined by temperature and solar radiation. This relationship can be modeled using simple numerical expressions to quantify the effect of these climatic variables upon the development rate. This study validated the concept of thermal time, expressed by the concept of degree-days, for predicting the phenological evolution of several table grape cultivars (Vitisvinifera L.). To model vine phenology we used the M itscherlich monomolecular equation and the Eichorn& Lorenz sequence. Phenology was evaluated for three cultivars throughout the growing season in several sites located in the climatic gradient ranging from a desertic to subhumid climates of Central Chile. Upon comparison, the resulting models for different cultivars showed a high degree of coincidence, especially during the embryogenic phase, which suggest the possibility of using a unique model, adapted to the characteristics of each cultivar.
El uso de probióticos en animales comenzó en la década del 70, cuando fueron incorporados en el a... more El uso de probióticos en animales comenzó en la década del 70, cuando fueron incorporados en el alimento de animales de producción. A partir de esta fecha empiezan a ser utilizadas cepas con características probióticas con el objeto de mejorar el crecimiento animal, su salud y resistencia a enfermedades. Los efectos benéficos de la aplicación de bacterias con características probióticas, han sido mejor documentadas en aves de producción, cerdos y bovinos. En acuicultura es un concepto nuevo y de creciente interés científico. Por otro lado, en equinos son pocos los estudios sobre los efectos de los probióticos en esta especie y una situación similar se da con los animales domésticos (perro y gato) y exóticos. El objetivo de esta monografía es dar una breve descripción del uso de los probióticos en animales, sus efectos sobre la salud y dar a conocer las necesidades futuras de investigación.
Journal of Chromatography A, 2005
An improved HPLC method is reported for the determination of rosemary's principal phenolic antiox... more An improved HPLC method is reported for the determination of rosemary's principal phenolic antioxidants, rosmarinic and carnosic acids, providing a fast and simultaneous determination for both of them by using a solid phase column. The analysis was performed with fresh methanolic extractions of Rosmarinus officinalis. To quantify the amount of antioxidants in a fast and reproducible way by means of UV-vis absorption measurements, a spectrophotometric multi-wavelength calibration curve was constructed based on the antioxidant contents obtained with the recently developed HPLC method. This UV-vis methodology can be extended to the determination of other compounds and herbs if the restrictions mentioned in the text are respected.
Vine phenology, like many other cultivated species, is highly determined by temperature and solar... more Vine phenology, like many other cultivated species, is highly determined by temperature and solar radiation. This relationship can be modeled using simple numerical expressions to quantify the effect of these climatic variables upon the development rate. This study validated the concept of thermal time, expressed by the concept of degree-days, for predicting the phenological evolution of several table grape cultivars (Vitisvinifera L.). To model vine phenology we used the M itscherlich monomolecular equation and the Eichorn& Lorenz sequence. Phenology was evaluated for three cultivars throughout the growing season in several sites located in the climatic gradient ranging from a desertic to subhumid climates of Central Chile. Upon comparison, the resulting models for different cultivars showed a high degree of coincidence, especially during the embryogenic phase, which suggest the possibility of using a unique model, adapted to the characteristics of each cultivar.
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Papers by Hugo Percy Sierra Goldberg