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Search Results: 1 - 10 of 157235 matches for " Fernando; Véles-Medina "
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Efecto de la adición de ácido cítrico sobre la degradación de las aflatoxinas y las propiedades funcionales de productos extrudidos de sorgo
Méndez-Albores,Abraham; Martínez-Bustos,Fernando; Véles-Medina,José Juan; Moreno-Ramos,Carolina; Del Río-García,Juan Carlos; Moreno-Martínez,Ernesto;
Interciencia , 2009,
Abstract: sorghum flour contaminated by aflatoxin at a concentration of 140μg·kg-1 was extrusion-cooked in a single screw extruder with a temperature profile of 60-80-100°c. the moisture content (mc) of the flour was adjusted to 20, 25 and 30% by adding aqueous citric acid (ca) at concentrations of 0, 0.5, 1, 2, 4 and 8n. the temperature profile in combination with the mc and ca concentrations significantly affected the extent of aflatoxin reduction in the extruded sorghum; the maximum percentage of aflatoxin reduction was 35.5%. in extruded sorghum prepared with high mc and ca concentrations, the highest values in color difference (de) and smallest values of viscosity were found. the expansion index was favored by higher mc and ca concentrations. the highest cutting force values were found in extruded products prepared with a higher mc, but there were no significant differences between those values and the different ca concentrations evaluated. using moderate extrusion conditions in combination with higher concentrations of ca, products were obtained with acceptable ph, color, viscosity, as well as with good textural and functional properties.
Absceso del psoas: revisión de la literatura y estado actual
Medina,Juan Fernando; Vivas,Víctor Hugo;
Revista Colombiana de Cirugía , 2004,
Abstract: the abscess of the psoas muscle is an uncommon entity, difficult to diagnose because of its generally inespecific presentation. it is often overlooked in daily clinical practice, and all this leads to delayed diagnosis. over the last years there has been and increase in the number of cases, a phenomenon that may be the result of advanced imaging technologies such as echography and ct scanning; also, there seems to be a change in etiology, modality of presentation, and diagnostic and management modalities.
Absceso del psoas: revisión de la literatura y estado actual Psoas muscle abscess: review of the literature and current concepts
Juan Fernando Medina,Víctor Hugo Vivas
Revista Colombiana de Cirugía , 2004,
Abstract: El absceso del músculo psoas es una afección poco frecuente y de difícil diagnóstico, con una presentación clínica generalmente inespecífica y a veces olvidada en la práctica diaria, lo que conlleva a retraso en el diagnóstico. Durante los últimos a os se ha determinado un aumento en el número de casos diagnosticados, lo cual se debe a la disponibilidad de técnicas imagenológicas avanzadas como la ecografía y la tomografía computarizada; asimismo, se han detectado modificaciones en cuanto a su etiología, variedad de presentación, modalidades diagnósticas y modificaciones en su manejo. The abscess of the psoas muscle is an uncommon entity, difficult to diagnose because of its generally inespecific presentation. It is often overlooked in daily clinical practice, and all this leads to delayed diagnosis. Over the last years there has been and increase in the number of cases, a phenomenon that may be the result of advanced imaging technologies such as echography and CT scanning; also, there seems to be a change in etiology, modality of presentation, and diagnostic and management modalities.
Fibrados vectoriales equivariantes en espacios homogéneos compactos
GONZáLES DíAZ,FERNANDO RICARDO;
Revista Integración , 2011,
Abstract: abstract. algebraic results are developed concerning to the equivariant vector bundles on some compact spaces, using global constructions and arguments. in a sense the approach is algebraic.
Aproximaciones Biológicas y Fisicoquímicas en el tratamiento de contaminantes: un resumen del aporte de la Universidad de los Andes
Jenny Dussan Garzón,Martha Josefina Vives-Florez,Víctor Manuel Sarria,Oscar Fernando Sánchez Medina
Revista de Ingeniería , 2009,
Abstract: Este resumen pretende dar una visión global de los aportes de la Universidad de los Andes en el tratamiento de aguas y suelos con la presencia de compuestos de difícil degradación o tiempo de vida media prolongado, tales como fármacos (Ciclofosfamida), lodos aceitosos y derivados de la industria del petróleo (Tolueno, Xileno, Fenol) derivados de la industria textil, química y pesticidas (Bisphenol A, AMBI, Glifosato, Isoproturon y Metobromuron), usando tecnologías ya sea basadas en procesos biológicos (biorremediación y bioadsorción) o de oxidación avanzada (foto-Fenton). /This summary intends to give a global view of the Universidad de los Andes contributions related to the water and soil treatment in the presence of recalcitrant or long half-life aquatic pollutants such as drugs (Cyclophosphamide), oil sludge and petroleum (Toluene, Xylene and Phenol), textile, chemical (Bisphenol A, AMBI) and pesticides (Glyphosate, Isoproturon, and Metobromuron) industry derived products based on biological (bioremediation and bioadsortion) and advanced oxidation (Photo-Fenton) approaches.
Abla??o de taquicardia ventricular idiopática com morfologia de bloqueio de ramo esquerdo localizada no tronco da artéria pulmonar
Leite, Luiz Roberto;Barreto, José R.;Melo, Roberval;Araujo, Edmur C.;Nogueira, Luciano;Fonseca, Lucas A.;D'ávila, Edson;Gonzáles, César;Cruz, Fernando;Paola, Angelo A. V. de;
Arquivos Brasileiros de Cardiologia , 2005, DOI: 10.1590/S0066-782X2005000200020
Abstract: we report the case of a 26-year-old female patient with palpitations and presyncopes due to nonsustained ventricular tachycardia, who had no structural heart disease. the patient underwent electrophysiological study in an attempt to ablate the arrhythmogenic focus, whose location was determined by using mapping criteria. because mapping of the right ventricular outflow tract was not successful, the catheter was placed inside the pulmonary artery with satisfactory mapping of the arrhythmogenic focus, and tachycardia was eliminated as soon as radiofrequency was initiated. the patient has remained asymptomatic for 14 months, with no treatment with antiarrhythmic drugs, and no arrhythmias on serial 24-hour holter.
Caracterización del proceso y herramientas metodológicas de la ingeniería de requerimientos para aplicaciones de sistemas de información geográfica
Medina Cardona,Luis Fernando;
Ingeniería e Investigación , 2007,
Abstract: this article describes the requirements engineering process and the methodological tools used in geographical information system (gis) applications as a way to face the absence of a consistent and complete specific alternative for this domain. requirements engineering for gis applications are thus introduced; requirements types, actors involved and communication aspects important for the process are exhibited and current methodologies are classified in modelling and specification languages. additionally, geomatic standards as a transversal element for gis applications are presented.
A critique of "resource-based" theories of colombia?s civil war
Medina,Luis Fernando;
Análisis Político , 2008,
Abstract: in recent years, several colombian scholars have studied this country?s civil conflict through the lenses of economic reasoning and state-of-the-art statistical testing. their analyses place most of the explanatory burden of the conflict on the existence of lootable resources and organized crime, not on any specific socio-economic factor of colombia?s reality ("objective causes"). this paper criticizes their claims while accepting their criteria and methods. in particular, it contends that their formal approach to civil conflicts is fl awed, a fl aw that carries over to the type of empirical tests conducted and that there are several gaps in the reasoning from statistical results to the overall interpretation of the conflict.
CARACTERIZACIóN BOVINOMéTRICA DE HEMBRAS CEBú Y CRUCES CON BLANCO OREJINEGRO, ROMOSINUANO Y ANGUS.
Medina,Juan Fernando;
Revista MVZ Córdoba , 2005,
Abstract: to characterize and to determine some factors that could have a greater utility making decisions in a cattle industry, were considered quantitative measurements like the high of the animal, the hips width and qualitative measurements such as body condition score, angle buttock, udder, nipples and the way the animal stands. variance analysis was carried out for the variables into each physiologic state (heifers, calves cows, pregnant calves cows, dry pregnant cows, and dry non pregnant cows) and they were considered the effects of the age of the animal (lineal and quadratic regression) and genetic group of the animal. the calves (9 to 12 months) had a weight average of 172.0 kg and the mature cows an average between 415 to 445 kg. the effect of genetic group was highly significant in the dry cows and the genetic groups with more weight were the zebu and crossing bonxcebú, for the other physiologic states they were not statistical differences. for the heifers the bxc/cxb (n = 100) presented minor body condition score in front of the cco/brh (n = 28), rxc/cxr (n = 50) and 3/4cx1/4a (n = 15). the dry cows genetic group, cco/brh (n = 328) was the one that presented the best body condition score. the dry pregnant cows showed differences between the genetic groups cco/brh (n = 273) and axc/cxa (n = 332). in the calves cows, genetic group 3/4cx1/4a (n = 91) obtained a major average to the other analyzed groups. the genetic group 3/4cx1/4a showed the best registrations for measurements physical qualities in the matured cows, which confirms their productive potential for our agro-ecologycals conditions.
EL CONCEPTO DE EQUILIBRIOS MúLTIPLES EN CIENCIAS SOCIALES
Medina,Luis Fernando;
Revista de Economía Institucional , 2011,
Abstract: the concept of equilibrium has become the centerpiece of modern economic analysis. moreover, it has provided the impetus behind the expansion of economic theory into areas of the social sciences that used to be regarded as remote. the current paper aims at explaining the changes in economic science that have brought about this process, while at the same time offering a cursory discussion of the foundations of the concept of equilibrium, its strengths, the methodological challenges it presents, especially as regards the case of "multiple equilibria", and a sketch of alternatives that could tackle said challenges.
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