990 resultados para Ecologia de agua doce


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Resumen La reunión sobre temas críticos de la regulación de los servicios de agua potable y saneamiento en los países de la región fue organizada por la División de Recursos Naturales e Infraestructura de la Comisión Económica para América Latina y el Caribe (CEPAL);, con el auspicio de la Superintendencia de Servicios Sanitarios (SISS); de Chile. El evento se realizó el 22 de septiembre de 2003, en la sede de la CEPAL, en Santiago de Chile. El objetivo central de la reunión fue analizar los temas de importancia creciente en la regulación de los servicios de agua potable y saneamiento en los países de América Latina y el Caribe. Los debates se centraron en torno a los puntos siguientes: (i); temas críticos de la regulación de los servicios de agua potable y saneamiento en los países de la región, (ii); los efectos de acuerdos internacionales de protección a la inversión y al comercio sobre la capacidad nacional de regulación de los servicios públicos, y (iii); la incorporación de la mitigación de desastres naturales en los marcos regulatorios del sector de agua potable y saneamiento. Este informe contiene un resumen de los debates, las conclusiones y recomendaciones, el programa, la lista de participantes y algunas de las presentaciones efectuadas en la reunión.

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This study aimed to collect data about organic production of freshwater fish. Today the production of organic food of plant origin is predominant in the market, however, the animal rearing with organic certificate has great potential, and is an important tool for adding value to grains and organic products. Regarding the regulation of organic aquaculture, producers are based on international standards. In Brazil, the norms for breeding are very recent and their regulation was consolidated through Interministerial Instruction No28, published on June 8, 2001 by Ministério da Agricultura, Pecuária e Abastecimento (MAPA) together with Ministério da Pesca e Aquicultura (MPA). In the literature there are few studies with organic fish farm, but according to available data, the rearing of species such as tilapia (Oreochromis niloticus), pacu (Piaractus mesopotamicus) and jundia (Ramdhia sp) fed with organic diet, in different rearing systems, show results quite optimistic about the production system, which is the focus of this work.

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An experimental apparatus containing a domestic refrigerator coupled to a vertical hot water storage tank was used for energy recovery. The original condenser of the refrigerator was maintained, but modified with a concentric tubes heat exchanger with countercurrent water and refrigerating gas flows. The coefficient of performance for the heat pump is calculated by the ratio of energy in the heat storage and the electric power consumed by the domestic refrigerator compressor. The results show that the increasing of hydrostatic pressure in the storage tank increases the water flow rate and the coefficient of performance. The proposed device also reduces the heat dissipation to the surroundings. This is more important in small confinements found in low-cost houses.

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The amount and timing of nitrogen application can favor seed quality, such as increasing protein content, which is an important constituent for embryo development. The objective of this study was to evaluate the physiological quality of sweet corn seeds collected from plants cultivated with different dosages and timings of nitrogen top-dressing applications. Seeds of the BR 400 variety (Super Sweet) were used obtained from plants submitted to dosages of 0, 40, 80 and 120kg ha -1 of N in two top-dressing applications (vegetative and reproductive stages). The weight of 100 grains, germination, first count of germination test, dry weight of normal seedlings from the germination test, seedling growth, cold test, accelerated aging, tetrazolium vigor and electric conductivity and emergency speed rate were determined. Data was submitted to an analysis of variance using the F-test at the 5% level and second degree regression analysis. The dosage and time of application of nitrogen top-dressing did not affect seed weight or the germination of sweet corn seeds. An increase of the N top-dressing dosage, applied in the vegetative stage reduced the length of the aerial part, the root and the whole seedling.

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