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| Bernal,Gladys; Velásquez,Alejandro; Vargas,Iván; Agudelo,Ana Cristina; Andrade,Carlos Alberto; Domínguez,Juan Gabriel; Ricaurte,Constanza; Mayo,Gisela. |
| Con el fin de entender los procesos de sedimentación en los Bancos de Salmedina durante el ciclo anual, tres trampas cilíndricas de sedimentos fueron instaladas sobre las mesetas arrecifales de los Bancos a una profundidad promedio de 8.5 m. Los cilindros fueron recolectados mensualmente entre julio de 2003 y septiembre de 2004. El contenido de las trampas fue analizado según su composición total y la composición de las partículas calcáreas biogénicas de la fracción arenosa. Los resultados fueron comparados con mediciones de parámetros ambientales en el área a lo largo del mismo período de tiempo. Se presenta un análisis de las variables sedimentológicas con énfasis en los aportes terrígenos y los porcentajes relativos de los componentes calcáreos, en... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Arrecifes; Caribe colombiano; Trampas de sedimentos; Ciclo anual. |
| Ano: 2006 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612006000100004 |
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| Velásquez,Alejandro; Rivero,Jordana; Marnet,Pierre-Guy. |
| The object of the present review is to analyze the methodologies that are commonly used to estimate protein degradability in the rumen, focusing on their attributes and limitations to offer suggestions for improving their use. This information is essential for selecting food types when formulating feed diets. A reliable prediction of the digestibility of ruminal proteins is basic information necessary for optimizing the use of nitrogenous sources because digestibility can translate, on the one hand, into higher yields of milk, milk protein, meat or wool and, on the other hand, into lower excretion of nitrogenous compounds into the environment; it also has an impact on animal health and welfare. Traditionally, the digestibility of feed proteins in the rumen... |
| Tipo: Journal article |
Palavras-chave: Ruminal protein degradability; Methodologies; Limitations. |
| Ano: 2016 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202016000200001 |
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| Velásquez,Alejandro; Arias,Rodrigo; Toneatti,Marcelo. |
| Extracts of Saccharomyces cerevisiae (Sc) yeast were generated using a biotechnological solid-state fermentation method. The organic material used for fermentation consisted of a variety of fibrous substrates of agricultural origin, and their effect on the chemical composition and productivity of cellular biomass generated was evaluated. The substrates studied included the following: wheat straw, WS; barley straw, BS; chili stubble, CS; oat hull, OH and starch powder, SP (control). For incubation with Sc, 2 g of (dry) vegetable substrate were added to 12 mL of cultivation medium. The fermentation time was seven days under aerobic conditions (pH 5, 26°C). After extraction of the yeast biomass, its chemical composition and productivity were analyzed. The... |
| Tipo: Journal article |
Palavras-chave: Protein concentrate; Saccharomyces cerevisiae; Vegetable substrate. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000300003 |
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| Velásquez,Alejandro; Marnet,Pierre-Guy; Arias,Rodrigo. |
| In a first experiment, the effect of in vitro incubation with Aspergillus niger (An) on the chemical composition of different fibrous substrates was studied. In a second experiment, the effect of incubation time (0,72 and 144 h) on in vitro digestion with An of dry matter (IVDMD), neutral detergent fiber (DVNDF) and acid detergent fiber (DVADF) was evaluated for different substrates. Wheat straw, WS; barley straw, BS; oat hulls, OH; dehydrated alfalfa, DA; and dehydrated ryegrass, DB substrates were evaluated. In both experiments, incubations were performed in 250 mL Erlenmeyer flasks; 2 g of substrate was added to a culture medium (pH = 6), and incubated at 28 °C with constant ventilation. The An dose consisted of 3 mL of a solution of 5.3 χ... |
| Tipo: Journal article |
Palavras-chave: Aspergillus niger; Fibrous substrates; In vitro digestion; Nutritional quality. |
| Ano: 2015 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202015000100005 |
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| Velásquez,Alejandro; Pichard,Gastón. |
| Proteolytic activity of enzymatic extracts generated from rumen microorganisms cultivated in vitro was evaluated. The incubation of rumen fluid used different substrates to generate a higher enzyme concentration and promote a broad spectrum of hydrolytic activity. The composition of the substrates used in the cultivation of the fluid was enriched in protein, starch or cell wall. Enzyme preparations were evaluated by incubating in 30 mL of buffer 50 mM Tris-HCl (pH 6.5) at 39 °C during 48 hours, 100 mg of crude protein from feeds soybean meal, canola meal, sunflower meal, gluten feed, dehydrated alfalfa meal, berseem clover, oat forage and perennial ryegrass. Enzyme extracts from cultivated rumen fluid showed an average protein breakdown of 75.5%, in eight... |
| Tipo: Journal article |
Palavras-chave: In vitro rumen proteolysis; Ruminal enzymes; Streptomyces griseus; In situ method. |
| Ano: 2010 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202010000300005 |
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