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Search Results: 1 - 10 of 561232 matches for " Luis A.; RESTREPO V. "
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NUEVA RUTA DE SíNTESIS DE GLICOLES A PARTIR DE ACEITES VEGETALES INSATURADOS EMPLEANDO CATALIZADORES áCIDOS HETEROGéNEOS
SUáREZ M,Ricardo; RIOS,Luis A; Restrepo V,Gloria;
Vitae , 2007,
Abstract: unique structures of fats and oils, together with their physical characteristics provide them a large range of applications; the reactive unsaturated fatty acids are commonly used to generate compounds with greater diversity of application (pharmaceutical, cosmetics and food industries). results obtained in the hydroxylation of methyl oleate (9-octadecenoic acid, methyl ester) by producing the epoxide, using prileschajew reaction, and the following epoxide opening with water are presented. for both stages the use of heterogenous meso- and macroporous acidic catalysts based on resins of sulfonated polystyrene (amberlite ir120, amberlyst 15, dowex50x2) was investigated. to provide a selective hydroxylation of vegetal oils with percarboxylic acids and heterogenous acidic catalysts, the crucial issue is to maximize the contact of the intermediate compound (epoxide) with the acidic sites. this can be achieved with acid resins with low cross-linking level (low dvb content) or with high superficial area. in addition, glycols production is selectively favored with the use of aprotic solvents with high dielectric constant.
NUEVA RUTA DE SíNTESIS DE GLICOLES A PARTIR DE ACEITES VEGETALES INSATURADOS EMPLEANDO CATALIZADORES áCIDOS HETEROGéNEOS NEW SYNTHESIS ROUTE FOR GLYCOLS FROM UNSATURATED VEGETABLE OILS USING HETEROGENEOUS ACIDIC CATALYSTS
Ricardo SUáREZ M,Luis A RIOS,Gloria Restrepo V
Vitae , 2007,
Abstract: Las estructuras únicas y las características físicas de las grasas proporcionan una amplia gama de aplicaciones; las insaturaciones reactivas de ciertos ácidos grasos se explotan para generar compuestos con mayor diversidad de aplicación (industria farmacéutica, cosmética, alimenticia, etc.). En este trabajo se reportan los resultados obtenidos en la hidroxilación de oleato de metilo (9-Octadecenoic acid, methyl ester) mediante un proceso que consiste en producir un epóxido usando el método de Prileschajew, y apertura de dicho epóxido con agua. Para ambas etapas se investigó el uso de catalizadores ácidos heterogéneos meso- y macro-porosos de tipo resinas de poliestireno sulfonadas (Amberlite IR120, Amberlyst 15, Dowex50X2). Los resultados indican que para la hidroxilación selectiva de aceites vegetales con ácidos percarboxílicos y catálisis ácida heterogénea, es decisivo maximizar el contacto del compuesto intermedio (epóxido) con los sitios ácidos, lo cual puede ser logrado con resinas ácidas con bajo nivel de entrecruzamiento (bajo porcentaje de DVB) o con alta área superficial; además, la producción de glicoles se ve favorecida selectivamente con solventes apróticos con alta constante dieléctrica. Unique structures of fats and oils, together with their physical characteristics provide them a large range of applications; the reactive unsaturated fatty acids are commonly used to generate compounds with greater diversity of application (pharmaceutical, cosmetics and food industries). Results obtained in the hydroxylation of methyl oleate (9-Octadecenoic acid, methyl ester) by producing the epoxide, using Prileschajew reaction, and the following epoxide opening with water are presented. For both stages the use of heterogenous meso- and macroporous acidic catalysts based on resins of sulfonated polystyrene (Amberlite IR120, Amberlyst 15, Dowex50X2) was investigated. To provide a selective hydroxylation of vegetal oils with percarboxylic acids and heterogenous acidic catalysts, the crucial issue is to maximize the contact of the intermediate compound (epoxide) with the acidic sites. This can be achieved with acid resins with low cross-linking level (low DVB content) or with high superficial area. In addition, glycols production is selectively favored with the use of aprotic solvents with high dielectric constant.
Efectos en el tracto reproductivo, digestivo y pérdida de peso corporal del ave semipesada sometida a descanso ovárico
Galeano,Luis F; Sorza,Juan D; Restrepo,Luis F; Vélez,Carlos A; Lopera,Pablo;
Revista Colombiana de Ciencias Pecuarias , 2010,
Abstract: the effects on the reproductive and digestive tract and loss of body weight of the brown egg layers submitted to ovarian rest. this research evaluated the application of the ovarian rest (or) on brown egg layers and the effect the age and duration of feed withdrawal have over the reproductive and gastrointestinal tract. 840 hy-line brown ? layers were used at 64 weeks of age in which three ages of induction to the or (65.70 and 75 weeks) and three feed withdrawal periods (five, ten and fifteen days) in a completely randomized statistical model, nested, of balanced and fixed effect. sacrifices were carried out in order to evaluate body weight, weight of the digestive and reproductive tract (ovary and oviduct), follicle percentage with a diameter equal to or higher than ten mm (lyf) and the percentage of the bird's weight loss. the model was significant (p<0.05) for all the variables evaluated; the age presented a significant effect (p<0.05) over the ovary weight and the follicle percentage (lyf), while the duration of the feed withdrawal related to the age had a significant effect (p<0.05) on all the variables, which indicates a greater effect of the feed withdrawal period contrasted to the age of the application of the or upon the variables evaluated. the ovary's weight (age 65:15.87 to ± 15.11; age 70: 7.92b ± 5.46; and age 75: 7.54b ± 4.96) and the follicle percentage (65: 43.75 to ± 21.54; age 70 18.05b ± 8.72 and age 75: 8.33b ± 6.85) showed a lowering tendency as the age increased. this type of behavior is associated with the gradual decrease in the number of follicles and the extended time between the maturation of one follicular wave and the next as the layer ages (kim, donalson, 2006; north, bell, 1990). the weight loss percentages (age 65: 24.24 ± 8.53%; age 70: 20.91 ± 5.50% and age 75: 20.88 ± 7.15%) were low compared to the reports on white egg layers, possibly due to the content of lipidic reserves which offers the brown egg layers the capacity to toler
Efectos en el tracto reproductivo, digestivo y pérdida de peso corporal del ave semipesada sometida a descanso ovárico Efeitos no trato reprodutivo, digestivo e perda do peso de aves semi-pesados submetidas a descanso ovárico The effects on the reproductive and digestive tract and loss of body weight of the Brown egg layers submitted to ovarian rest
Luis F Galeano,Juan D Sorza,Luis F Restrepo,Carlos A Vélez
Revista Colombiana de Ciencias Pecuarias , 2010,
Abstract: Esta investigación evaluó la aplicación del descanso ovárico (DO) en aves semipesadas y el efecto que tienen la edad y la duración del ayuno sobre el tracto reproductivo y gastrointestinal. Se utilizaron 840 ponedoras de la línea Hy-Line Brown con 64 semanas de edad, se evaluaron tres edades de inducción al DO (65, 70 y 75 semanas) y tres períodos de ayuno (cinco, diez y quince días), en un modelo estadístico completamente aleatorizado, anidado, efecto fijo y balanceado. Se sacrificaron aves para evaluar el peso corporal, peso del tracto digestivo, peso del tracto reproductivo (ovario y oviducto), porcentaje de folículos con diámetro igual o superior a diez mm (LYF) y el porcentaje de pérdida de peso del ave. El modelo fue significativo (p<0.05) para todas las variables evaluadas; la edad presentó efecto significativo (p<0.05) en el peso del ovario y el porcentaje de folículos (LYF), mientras que la duración del ayuno anidado en la edad presentó efecto significativo (p<0.05) en todas las variables, lo que indica un mayor efecto del período de ayuno en contraste con la edad de aplicación del DO sobre las variables evaluadas. El peso del ovario (edad 65:15.87 ±15.11; edad 70: 7.92 ± 5.46; y edad 75: 7.54 ± 4.96) y porcentaje de folículos (LYF) (edad 65: 43.75 ± 21.54; la edad 70 18.05 ± 8.72 y edad 75: 8.33 ± 6.85), mostraron tendencia en la disminución a medida que aumenta la edad, comportamiento que está asociado con la disminución gradual del número de folículos y la ampliación del tiempo entre la maduración de una onda folicular y la siguiente normal del ave a medida que envejece (Kim y Donalson, 2000; North y Bell, 1990). Los porcentajes de pérdida de peso (edad 65: 24.24 ± 8.53%; edad 70: 20.91 ± 5.50% y edad 75: 20.88 ± 7.15%), fueron menores en comparación con los reportes en líneas livianas, posiblemente debido al contenido de reservas lipídicas, lo que ofrece al ave semipesada la capacidad de tolerar el ayuno. Las tres edades presentaron relación directa entre la duración de los períodos de ayuno y el efecto en la atrofia reproductiva y pérdida de peso, permitiendo determinar que no es necesario someter un ave a ayunos superiores a diez días, puesto que con este período se logra la pérdida de peso y atrofia reproductiva necesaria en la implementación del DO. Foi avaliado o descanso ovárico (DO) em galinhas semipesadas e o efeito da idade e a dura o do jejum sobre o trato reprodutivo e gastrointestinal. Foram utilizadas 840 galinhas poedoras da linha Hy-Line Brown com 64 semanas de idade, foram avaliadas três idades de indu o ao DO (65, 70 e 7
Enfermedad cutánea ampollosa en el lupus eritematoso sistémico
González Naranjo,Luis Alonso; Vásquez Duque,Gloria María; Restrepo Escobar,Mauricio;
Iatreia , 2012,
Abstract: bullous systemic lupus erythematosus (bsle) is an unusual cutaneous manifestation in systemic lupus erythematosus (sle) caused by autoantibodies targeting type vii collagen and other essential constituents of the dermal-epidermal junction. this rare entity is observed in patients who meet the american college of rheumatology revised criteria for sle and usually in the context of increased systemic disease activity. differential diagnoses of bsle include other autoimmune bullous diseases such as bullous pemphigoid, epidermolysis bullosa acquisita, linear iga bullous dermatosis and dermatitis herpetiformis which have also been reported in association with sle.
Coexistencia de espondiloartritis psoriática y gota: a propósito de un caso
Restrepo Escobar,Mauricio; González Naranjo,Luis Alonso; Vásquez Duque,Gloria María;
Revista Colombiana de Reumatología , 2011,
Abstract: despite the commonly accepted association between psoriasis and hyperuricemia there are few reports of gout in patients with psoriasis and many less frequent reporting the coexistence of gout and psoriatic arthritis. we report a patient diagnosed with gouty arthritis and psoriatic arthritis, spondylarthritis variety, and we emphasize that it is the first time that this association is reported in the literature.
EXTRACCIóN DEL CAROTENOIDE LICOPENO DEL TOMATE CHONTO (Lycopersicum esculentum)
CARDONA,Eliana M.; RíOS,Luis A.; RESTREPO V.,Gloria M.;
Vitae , 2006,
Abstract: lycopene, to which tomato owes its red coloration, besides presenting great properties like colorant, is a powerful antioxidant that helps to combat degenerative diseases. due to the importance that has been given to lycopene, because of its properties, in this investigation both steam-dragging and solvent extraction methods are compared based on the obtained yield and the pre-treatment given to the vegetable sample, characterizing the obtained extracts by means of visible uv spectrometry. extractions are also carried out to determine the lycopene content in tomato chonto lycopersicum esculentum, as well as other parameters of the extraction process: temperature, ratio mass of tomato pulp to solvent volume, time of extraction and number of stages. with these parameters, a basic design of a pilot plant is proposed for the extraction of this carotenoid, arranging the equipment according to the corresponding flow diagram and under the necessary operation conditions to avoid the degradation and decomposition of lycopene along the process and that allow to obtain a yield of 6 g of oleoresin / kg of pulp.
Coexistencia de espondiloartritis psoriática y gota: a propósito de un caso Coexistence of psoriatic spondylitis and gout: a case report
Mauricio Restrepo Escobar,Luis Alonso González Naranjo,Gloria María Vásquez Duque
Revista Colombiana de Reumatología , 2011,
Abstract: A pesar de la asociación frecuentemente aceptada entre psoriasis e hiperuricemia existen pocos reportes de gota en pacientes con psoriasis y muchos menos frecuente el reporte de la coexistencia de gota y artritis psoriática. Reportamos el caso de un paciente con diagnósticos de artritis gotosa y artritis psoriática variedad espondiloartritis, y resaltamos que es la primera vez que se reporta esta asociación en la literatura. Despite the commonly accepted association between psoriasis and hyperuricemia there are few reports of gout in patients with psoriasis and many less frequent reporting the coexistence of gout and psoriatic arthritis. We report a patient diagnosed with gouty arthritis and psoriatic arthritis, spondylarthritis variety, and we emphasize that it is the first time that this association is reported in the literature.
Enfermedad cutánea ampollosa en el lupus eritematoso sistémico = Bullous skin disease in systemic lupus erythematosus
González Naranjo, Luis Alonso,Vásquez Duque, Gloria María,Restrepo Escobar, Muricio
Iatreia , 2012,
Abstract: El lupus eritematoso sistémico ampolloso (LESA) es una manifestación infrecuente del lupus eritematoso sistémico (LES) causada por autoanticuerpos contra el colágeno tipo VII y otros componentes esenciales de la unión dermoepidérmica. Se presenta en pacientes que cumplen los criterios revisados de clasificación para LES del Colegio Americano de Reumatología y en presencia de alta actividad sistémica. El diagnóstico diferencial incluye otras enfermedades ampollosas autoinmunes como el penfigoide ampolloso, la epidermólisis ampollosa adquirida, la dermatosis ampollosa IgA lineal y la dermatitis herpetiforme las cuales también han sido informadas en LES.
Polyarteritis nodosa related with influenza vaccine = Poliarteritis nodosa relacionada con vacuna contra la influenza
Restrepo Escobar, Mauricio,González Naranjo, Luis Alonso,Vásquez Duque, Gloria María
Iatreia , 2013,
Abstract: Vasculitis can be secondary to various processes, among them infections, malignancies, connective tissue diseases or medications, or primary, generally idiopathic. The reported adverse events after vaccination can be mild and transient or more serious such as autoimmune diseases. Possibly the most frequently described autoimmune phenomena after influenza vaccination are different forms of vasculitis. We report the case of a patient who presented a clinical picture of vasculitis classified as polyarteritis nodosa that began two weeks after receiving the influenza vaccine. After critically reviewing the literature, this would be the first clearly documented case of polyarteritis nodosa associated with vaccination against influenza.
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